JP2005235172A - Drawing device and drawing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing device and a drawing method for changing a generation number of control points based on obtained system information and for generating a free curved surface/a free curved line in a three-dimensional object with optimum rendering quality according to the situation of a system. <P>SOLUTION: System information such as a clock gear ratio of this drawing device influencing a drawing process, an assigned bandwidth, a bus traffic amount, a network traffic amount and interrupt frequency of the drawing device, or drawing object information influencing how the drawing object looks such as moving speed information, display area information of the drawing object, distance information to a notable object, object number information, size information, display period information and image quality information of a display part are acquired. By controlling the generation number of control points used for generating a free curved surface/a curved line according to at least one of the acquired pieces of information, a drawing part 100 can control the calculation amount of the free curved surface/curved line creation according to the situation of the system. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drawing apparatus and a drawing method.

  As a technique for drawing a free curved surface / free curve in a virtual three-dimensional space (or virtual two-dimensional space), a technique using a parametric curve using control points such as a Bezier curve or a spline curve is known. The free curve is generated as an n-th order graph having control points as constituent points or tangent points. In the generation of free-form surfaces and free curves using parametric curves, the more control points there are, the more precise free-form surfaces and free curves can be generated, but as the number of control points increases, free-form surfaces and free curves can be generated. This increases the amount of computation.

  On the other hand, in a system that displays 3D graphics and plays video, a screen update period is provided according to the performance of the drawing device and display unit, and data for image drawing is generated during the screen update period. It is necessary to send the data to the display unit. A frame rate is known as an index indicating how many times the screen can be rewritten per second. For example, when the frame rate is 30 fps, drawing is performed 30 times per second.

  In a drawing apparatus provided with such a screen update period, when drawing a free-form surface or a free curve, an operation for generating an image for a predetermined area during the screen update period, and writing to a frame buffer, It is necessary to complete data transmission to the display unit. When many control points are used to perform highly accurate drawing, the amount of calculation increases. As a result, a series of drawing processes may not end within the screen update period. On the other hand, if the number of control points of the object to be drawn is uniformly reduced, the amount of calculation can be reduced, but image data lacking the fineness of the image will always be generated, impairing user satisfaction. There is a possibility that.

  There are the following methods for changing the calculation amount of the conventional image drawing.

  According to the technique of Patent Document 1, a method of changing the number of divisions according to a point selected from control points of a display object or a distance between a representative point of the control point and a viewpoint, or a simple object of a display object A technique is used in which the number of divisions is changed in accordance with the distance between the point selected from the constituent points and the representative point of the constituent point of the simple object and the viewpoint. As a result, the number of divisions of drawing objects at a distance from the viewpoint is reduced, and the amount of calculation of drawing processing is reduced.

Further, according to the technique of Patent Document 2, when the screen update period changes or when at least one of a pause effect and a slow effect occurs, at least one of a model to be used, whether an object is drawn, and the content of rendering. To change. As a result, in the normal drawing update period, high-speed drawing processing is performed even with low image quality so that drawing can be performed reliably within the update period of the screen, and when the drawing update period becomes long, it takes some time. Even high-quality images can be drawn.
Japanese Patent Laid-Open No. 2001-250128 (page 14, FIG. 4) JP 2002-183745 A (page 6, FIG. 3)

  In Patent Document 1, the amount of calculation is reduced according to the distance from the viewpoint of the drawing object. However, since the amount of calculation is reduced using only the distance from the viewpoint as an index, the display object is close to the viewpoint. The amount of computation cannot be reduced. For this reason, when a large number of drawing objects whose display objects are close to each other are generated, the drawing process may not be completed within the screen update period. Furthermore, since the amount of calculation does not change depending on the calculation performance of the drawing apparatus or the system status, the drawing processing may not be completed within the screen update period depending on the system status.

  In Patent Document 2, although the amount of calculation is changed according to the change of the drawing update period, the drawing process is not completed due to the system condition other than the screen update period because the system condition other than the drawing update period is not taken into consideration. there is a possibility. Furthermore, if control points are generated for the purpose of reducing the amount of calculation of free-form surfaces / free-form curves so that the drawing process can be completed within the screen update period, a low-accuracy image is generated. At this time, high-precision drawing is performed only when the drawing update period satisfies a given condition.

  Further, in Patent Document 2, although the amount of calculation is changed according to the change in the drawing update period, a low-quality image is uniformly generated in a normal drawing update period in which no pause effect or slow effect occurs. Will be.

  In view of the above problems, the present invention changes the number of control points generated based on acquired system information, and generates a free-form surface / free-form curve on a three-dimensional object with optimal drawing quality according to the system status. An object drawing apparatus and drawing method are provided.

  In addition, in view of the above problems, the present invention changes the number of control points based on drawing object information obtained by a device that acquires and generates drawing object information, and the lack of precision is not noticeable with a small amount of calculation. The present invention provides a drawing apparatus for generating a free curved surface and a free curve on a three-dimensional object with drawing quality.

  The drawing apparatus according to the present invention sets an information acquisition unit for acquiring system information or drawing object information, and sets a curved surface interpolation level for determining the number of control points for generating a curved surface or a curve according to the acquired information. A control point generation unit that generates the control point according to a curved surface interpolation level; and a curved surface generation unit that generates a curved surface based on the control point, and dynamically calculates a curved surface drawing amount of the display object based on the information It is configured to change. The control point generation unit and the curved surface generation unit constitute a drawing unit of a block that performs a drawing process.

  Here, the system information means the remaining battery level of the power supply, the clock gear ratio of the drawing device, the allocated bandwidth of the drawing device to the storage unit, the bus traffic amount of the interconnection network, the network traffic amount of the network, the interrupt frequency to the drawing device, etc. It is at least one of these. The drawing object information includes the movement speed information of the generated drawing object, the display area information of the drawing object, the distance information of the drawing object from the target object, the number information of the drawing object, the size information of the drawing object, and the drawing object information. This is at least one of display period information and image quality information of the display unit.

  According to this configuration, it is possible to generate a free curved surface / free curved line with optimum drawing quality in accordance with the situation of the system and the situation of the drawing object. Here, the optimum drawing quality is the highest-quality drawing quality that completes the drawing process within the screen update period, or the drawing quality that meets the intention of the drawing device creator or user.

  The drawing apparatus according to the present invention sets a curved surface interpolation level that determines the number of control points for generating a curved surface or a curve by setting a system information acquiring unit that acquires system information and the system information to the curved surface interpolation level. And a control point generator that generates the control point according to the control point, and a curved surface generator that generates a curved surface based on the control point, and dynamically changes the amount of curved surface drawing of the display object based on the system information. It is configured as follows. The control point generation unit and the curved surface generation unit constitute a drawing unit of a block that performs a drawing process. The control point generator changes the number of control points used to generate the free-form surface and free curve according to the acquired system information, and the amount of computation for generating the free-form surface and free curve generated by the surface generator changes Let

  The drawing method according to the present invention corresponding to the above drawing device acquires system information, determines a curved surface interpolation level for generating a curved surface or a curve based on the system information, generates a control point, and based on the control point Curved surface generation is performed, and the amount of calculation of curved surface drawing of a display object is dynamically changed based on the system information.

  According to the above-described drawing apparatus and drawing method of the present invention, the number of control points for generating a free curved surface or a free curve is controlled based on system information, and the free curved surface Since a free curve is generated, it is possible to generate a free curved surface and a free curve with optimum drawing quality within a given drawing update period.

  The drawing device according to the present invention is a drawing device having a fixed screen update period, and includes a drawing object information acquisition unit for acquiring drawing object information, and a drawing object generated and recognized by the drawing object information acquisition unit. Adopting a configuration comprising a control point generator for generating control points for generating free curved surfaces and free curves according to information, and a curved surface generator for generating curved surfaces based on the control points generated by the control point generator The drawing accuracy of the drawing object is changed every certain screen update period (one frame to several frames).

  Here, the drawing apparatus is a system for drawing a three-dimensional object or a two-dimensional object including a drawing unit and a drawing object information acquisition unit. The drawing unit is a block that performs drawing processing including a control point generation unit and a curved surface generation unit.

  In addition, the drawing object information acquisition unit includes the movement speed information of the drawing object, the display area information of the drawing object, the distance information of the drawing object with respect to a specific drawing object (hereinafter referred to as a target object), the number information of the drawing objects, This block generates at least one of drawing object size information, drawing object display period information, and display unit image quality information. The control point generator is a block that generates control points that are points used to determine the shape of a free-form surface / curve. The curved surface generation unit is a block that generates a free curved surface or a free curve using the control points generated by the control point generation unit.

  In the present invention, the movement speed information of the drawing object acquired and generated by the drawing object information acquisition unit, the display area information of the drawing object, the distance information of the drawing object from the object of interest, the number information of the drawing object, the size information of the drawing object Generated by the curved surface generation unit for each screen update period by the control point generation unit changing the number of control points according to at least one of the display period information of the drawing object or the image quality information of the display unit The amount of computation for generating a free curved surface / free curve and the drawing accuracy of the free curved surface / free curve are changed.

  According to the drawing apparatus and drawing method of the present invention described above, the number of control points for generating a free curved surface or a free curve is controlled on the basis of drawing object information, and the calculation amount according to the state of the drawing object can be freely set. Since the curved surface / free curve is generated, it is possible to generate the free curved surface / free curve with optimum drawing quality within a given drawing update period.

  As is clear from the above description, each part of the constituent elements may be configured by hardware or software.

  According to the present invention, the number of control points for determining the shape of the free-form surface / free-form curve is changed according to the system status and calculation performance. Then, based on this control point, a free curved surface / free curved line is generated. Accordingly, it is possible to generate a free curved surface / free curved line with optimum drawing quality according to the system status.

  For example, by generating the maximum number of control points that are determined to be in time for drawing, it is possible to generate the most accurate free-form surface / curve from among free-form surfaces / curves that can be generated without problems. . In addition, by setting to generate a small number of these control points, it is possible to reduce the amount of calculation and reduce power consumption.

  Furthermore, by controlling the number of control points according to the remaining battery level, it is possible to inform the user of the remaining battery level through the drawing quality.

  Further, according to the present invention, the number of control points for determining the shape of the free curved surface / free curved line changes depending on how the drawing object is viewed from the user. Then, based on this control point, a free curved surface / free curved line is generated. Accordingly, it is possible to generate a free-form surface / free-form curve with an optimum drawing quality according to how the drawing object is viewed. For example, when drawing a fast-moving object that moves a long distance in a short time, a drawing object that the user thinks is difficult to recognize due to visual characteristics generates a free-form surface / free-form curve using few control points. It is possible to reduce the amount of calculation. In addition, by setting the number of control points to be small, it is possible to reduce power consumption by reducing the amount of computations, and to generate free curved surfaces and free curves for hardware resources. It becomes possible to use for processing other than.

  The drawing apparatus according to the present invention sets an information acquisition unit for acquiring system information or drawing object information, and sets a curved surface interpolation level for determining the number of control points for generating a curved surface or a curve according to the acquired information. A control point generation unit that generates the control point according to a curved surface interpolation level; and a curved surface generation unit that generates a curved surface based on the control point, and dynamically calculates a curved surface drawing amount of the display object based on the information It is configured to change. The control point generation unit and the curved surface generation unit constitute a drawing unit of a block that performs a drawing process.

  Here, the system information means the remaining battery level of the power supply, the clock gear ratio of the drawing device, the allocated bandwidth of the drawing device to the storage unit, the bus traffic amount of the interconnection network, the network traffic amount of the network, the interrupt frequency to the drawing device, etc. It is at least one of these. The drawing object information includes the movement speed information of the generated drawing object, the display area information of the drawing object, the distance information of the drawing object from the target object, the number information of the drawing object, the size information of the drawing object, and the drawing object information. This is at least one of display period information and image quality information of the display unit.

  According to this configuration, it is possible to generate a free curved surface / free curved line with optimum drawing quality in accordance with the situation of the system and the situation of the drawing object. Here, the optimum drawing quality is the highest-quality drawing quality that completes the drawing process within the screen update period, or the drawing quality that meets the intention of the drawing device creator or user.

  The drawing apparatus according to the present invention sets a curved surface interpolation level that determines the number of control points for generating a curved surface or a curve by setting a system information acquiring unit that acquires system information and the system information to the curved surface interpolation level. And a control point generator that generates the control point according to the control point, and a curved surface generator that generates a curved surface based on the control point, and dynamically changes the amount of curved surface drawing of the display object based on the system information. It is configured as follows. The control point generation unit and the curved surface generation unit constitute a drawing unit of a block that performs a drawing process. The control point generator changes the number of control points used to generate the free-form surface and free curve according to the acquired system information, and the amount of computation for generating the free-form surface and free curve generated by the surface generator changes Let

  The drawing method according to the present invention corresponding to the above drawing device acquires system information, determines a curved surface interpolation level for generating a curved surface or a curve based on the system information, generates a control point, and based on the control point Curved surface generation is performed, and the amount of calculation of curved surface drawing of a display object is dynamically changed based on the system information.

  According to this configuration, it is possible to generate a free curved surface / free curved line with optimum drawing quality in accordance with the system status.

  In the above configuration, there are several modes for the components of the system information acquisition unit. Hereinafter, description will be made sequentially.

  (1) The system information is a battery remaining amount (a remaining amount of power that can be supplied to the drawing apparatus when the drawing apparatus is supplied with power by some kind of power supply apparatus), and the remaining battery level A battery remaining amount information acquisition unit for acquiring

  When the remaining battery level does not meet a given condition, if you generate a small number of control points so that the drawing accuracy is reduced, the user can determine the remaining battery level with the drawing accuracy of the display object. Is possible.

  (2) When the system information has a clock gear ratio (the mechanism that can change the clock cycle of each block in the rendering apparatus, the ratio of the clock cycle of the rendering unit to the specific block or the clock of the rendering unit relative to the reference clock cycle) And a clock gear ratio information acquisition unit for acquiring the clock gear ratio.

  This reflects the clock gear ratio, which is the calculation performance, in the calculation amount for the free-form surface / free-form curve. According to this, the number of control points of the free curved surface / free curve is changed according to the clock gear ratio which is the system status, and the free curved surface / free curve is generated based on the control point whose number is adjusted. It is possible to generate free-form surfaces and free-form curves with optimum drawing quality according to the clock gear ratio. That is, as the clock gear ratio is larger, the number of control points is increased and the generation of the free-form surface / free-form curve can be made highly accurate. Also, the smaller the clock gear ratio, the smaller the number of control points, thereby reducing the amount of calculation and reducing the power consumption.

  (3) The system information is allocated bandwidth information of the drawing device with respect to the storage unit (in the case where the drawing device has a storage unit such as a main memory or a frame buffer, per unit time that the drawing unit can access the storage unit) Data transfer capacity) and having an allocated bandwidth information acquisition unit for acquiring the allocated bandwidth information.

  This reflects the allocated bandwidth, which is the calculation performance, in the calculation amount for the free-form surface / free-form curve. According to this, the number of control points of the free curved surface / free curve is changed according to the allocated bandwidth, and the free curved surface / free curve is generated based on the control point whose number is adjusted. It is possible to generate free-form surfaces and free-form curves with optimal drawing quality. That is, as the allocated bandwidth is larger, the number of control points is increased, and the generation of the free-form surface / free-form curve can be improved. Further, the smaller the allocated bandwidth, the smaller the number of control points, thereby reducing the amount of calculation and reducing the power consumption.

  (4) The system information is the amount of bus traffic in the interconnection network (the amount of data traffic on the interconnection network such as a bus connecting the drawing unit, the storage unit, the display unit, etc.), and the bus for acquiring the bus traffic amount Have a traffic information acquisition unit.

  This reflects the amount of bus traffic, which is the state of the system, in the calculation amount for free-form surfaces and free-form curves. According to this, the number of control points of the free curved surface / free curve is changed according to the bus traffic amount, and the free curved surface / free curve is generated based on the control point whose number is adjusted. It is possible to generate free-form surfaces and free-form curves with optimal drawing quality. That is, it is possible to increase the number of control points as the bus traffic amount is smaller, and to increase the accuracy of generating free-form surfaces and free-form curves. In addition, as the bus traffic amount increases, the number of control points can be reduced, thereby reducing the amount of computation and reducing power consumption.

  (5) The system information is a network traffic amount (a data traffic amount on the network connecting the drawing device and the outside), and has a network traffic information acquisition unit for acquiring the network traffic amount.

  This reflects the amount of network traffic, which is the state of the system, in the calculation amount for free-form surfaces and free-form curves. According to this, the number of control points of the free curved surface / free curve is changed according to the amount of network traffic, and the free curved surface / free curve is generated based on the control points whose number is adjusted. It is possible to generate free-form surfaces and free-form curves with optimal drawing quality. That is, it is possible to increase the number of control points as the amount of network traffic is smaller, and to increase the accuracy of generating free-form surfaces and free-form curves. Further, as the amount of network traffic increases, the number of control points can be reduced to reduce the amount of calculation and reduce power consumption.

  (6) The system information indicates the interrupt frequency for the drawing device (the interrupt command issued to the drawing device or the drawing unit due to an external factor such as a user operation or an internal factor such as a privileged command, or similar interrupt processing) Frequency) and having an interrupt frequency information acquisition unit for acquiring the interrupt frequency.

  This reflects the interrupt frequency, which is the system status, in the amount of computation for free-form surfaces and free-form curves. According to this, the number of control points of the free curved surface / free curve is changed according to the interrupt frequency, and the free curved surface / free curve is generated based on the control point whose number is adjusted. It is possible to generate free-form surfaces and free-form curves with good drawing quality. That is, the smaller the interrupt frequency, the greater the number of control points, and the more accurate the generation of free-form surfaces and free-form curves can be achieved. Further, the greater the interrupt frequency, the smaller the number of control points, thereby reducing the amount of calculation and reducing power consumption.

  (7) The system information is any two or more of the remaining battery level, the clock gear ratio, the allocated bandwidth information, the bus traffic volume, the network traffic volume, and the interrupt frequency for the drawing device. Therefore, at least two of the remaining battery level information acquisition unit, clock gear ratio information acquisition unit, allocated bandwidth information acquisition unit, bus traffic information acquisition unit, network traffic information acquisition unit, interrupt frequency information acquisition unit corresponding to each Have it.

  Regarding the setting of the calculation amount in the drawing apparatus having the above-described configuration, the calculation amount may be set depending on whether the system information is higher or lower than a preset value, or stepwise depending on the system information. It is also possible to change the calculation amount.

  The calculation amount in the drawing apparatus having the above configuration may be calculated from the curved surface interpolation level, may be calculated from the number of control points, or may be calculated from the curved surface interpolation level and the number of control points. You may ask for it.

  In another aspect, the screen update period is the number of cycles when image data is sent to the display device. For example, in the case of 30 fps, the screen update period is 30 times per second. A drawing device that updates a screen. By setting the screen update period to be short, the movement and deformation of the drawing object will appear smooth, but address generation for mapping to the virtual three-dimensional space (or virtual two-dimensional space), drawing processing of the drawing object, It is necessary to write to the frame buffer within the screen update period.

  For example, in the case of 30 fps, the frame buffer is written every 1/30 seconds. However, the calculation amount for generating the free curved surface / free curve generated by the curved surface generation unit and the drawing accuracy of the free curved surface / free curve The change may be performed not only every frame (1/30 second) but also every few frames (1/30 × n seconds).

  The drawing object is an object to be drawn in the virtual three-dimensional space (or virtual two-dimensional space) by the drawing device within the screen update period, and a part or all of the drawing object is composed of a free curved surface and a free curve. The

  The drawing object information includes the movement speed information of the generated drawing object, the display area information of the drawing object, the distance information of the drawing object from the target object, the number information of the drawing object, the size information of the drawing object, and the drawing object information. It is at least one of display period information and image quality information of the display unit.

  Here, the moving speed of the drawing object is the speed at which the drawing object moves within a certain drawing update period. Here, it is assumed that the movement distance for calculating the movement speed is the distance that the representative point of the drawing object has moved in a certain screen update period. Here, the representative point may be obtained by calculation based on a plurality of control points (such as the center of gravity), or a representative point may be selected from the control points in advance. The distance may be a linear distance in a virtual three-dimensional space (or a virtual two-dimensional space) or a distance based on a predetermined calculation method. The fixed image update period may be one frame or several frames. Therefore, the amount of calculation for generating a free-form surface / free curve can be changed according to the movement distance of the drawing object within a certain screen update period, that is, the moving speed, and the drawing accuracy of the free-form surface / free curve can be changed. Is possible. In addition, if a drawing object with a high moving speed is generated with a smaller number of control points than a drawing object with a low movement speed, the amount of computation for generating a drawing object with a speed at which it is difficult for the user to recognize an accurate shape will be reduced. It becomes possible to suppress.

  In addition, the display area of the drawing object is a number of display areas designated before or during the operation of the drawing apparatus, excluding the depth direction of the virtual three-dimensional space (or virtual two-dimensional space) visible from the display unit. Position information indicating which display area is displayed in which each drawing object is displayed. It is determined which display area the drawing object is in, and a control point for drawing a free-form surface / free-curve with a predetermined accuracy in an area where the drawing object exists is generated. Here, the determination as to which region the drawing object is present is made based on the coordinates of the representative point of the drawing object. Here, the representative point may be obtained by calculation based on a plurality of control points (such as the center of gravity), or a representative point may be selected from the control points in advance. Further, the representative point is not limited to one, but a plurality or all of the control points may be used as the representative points. When there are a plurality of representative points, the display area with the largest number of each representative point may be used as the display area of the drawing object, and the idea of having a separate display area for each representative point is introduced. It doesn't matter. Therefore, according to the present invention, it is possible to change the amount of calculation for generating a free curved surface / free curve according to the display area to which the drawing object belongs, and to change the drawing accuracy of the free curved surface / free curve. For example, if a drawing object far from the center of the display unit is generated with a smaller number of control points than a close drawing object, the user can have an accurate shape when the user gazes at the center of the display unit. It is possible to reduce the amount of calculation for generating a drawing object that is difficult to recognize.

  The distance between the drawing object and the target object is the distance between the drawing object and the target object. Here, the object of interest is a program, data, or a program, data set via a network, previously stored in the storage unit during operation or from a virtual three-dimensional space (or virtual two-dimensional space), Or the drawing object designated by the user via the operation unit. The distance may be a linear distance in a virtual three-dimensional space (or a virtual two-dimensional space) or a distance based on a predetermined calculation method. Therefore, according to the present invention, it is possible to change the amount of calculation for generating a free curved surface / free curve according to the distance of the drawing object from the object of interest, and to change the drawing accuracy of the free curved surface / free curve. . In addition, if a drawing object that is far from the object of interest is generated with a smaller number of control points than a drawing object that is close, the amount of computation required to generate a drawing object whose exact shape is difficult for the user to recognize. Can be suppressed.

  The number of drawing objects is the number of drawing objects drawn in the virtual three-dimensional space (or virtual two-dimensional space). Therefore, according to the present invention, the amount of calculation for generating a free-form surface / free curve can be changed depending on the number of drawing objects, and the drawing accuracy of the free-form surface / free curve can be changed.

  Note that the number that is the basis for changing the drawing accuracy of the free-form surface / free-form curve is not limited to the drawing object, but may be the total number of control points or the number of representative points for generating the drawing object, for example. Also, if a drawing object with a large number of drawing objects is generated with a smaller number of control points than a drawing object with a small number of objects, the amount of computation for generating a drawing object whose exact shape is difficult for the user to recognize is reduced. It becomes possible to suppress.

  The size of the drawing object is a size recognized in a virtual three-dimensional space (or virtual two-dimensional space) in which the drawing object is recognized by the user through the display device. Here, the size may be a linear distance between two representative points selected from the control points, or a size obtained by calculating an average distance from the center of gravity of a plurality of representative points to each control point. It is good as a standard. Therefore, according to the present invention, it is possible to change the amount of calculation for generating a free curved surface / free curve according to the size of the drawing object, and to change the drawing accuracy of the free curved surface / free curve. Also, if a drawing object with a small drawing object is generated with a smaller number of control points than a drawing object with a large drawing object, the amount of calculation for generating a drawing object whose accurate shape cannot be recognized by the user can be reduced. Is possible.

  The display period of the drawing object is a frame in which an elapsed time since the drawing object appears in the virtual three-dimensional space (or virtual two-dimensional space) recognized by the user through the display unit, that is, a drawing result is transmitted to the display unit. This is the elapsed time since writing to the buffer area. Therefore, according to the present invention, the amount of calculation for generating a free-form surface / free curve can be changed according to the elapsed time after the drawing object is displayed on the display unit, and the drawing accuracy of the free-form surface / free curve is changed. It becomes possible. In addition, if a drawing object with a short display period is generated with a smaller number of control points than a long drawing object, the amount of calculation for generating a drawing object whose exact shape is difficult for the user to recognize. Can be suppressed.

  The image quality set in the display unit is the display unit performance or setting value that affects the appearance of the drawing object from the user, such as color gradation, brightness, contrast, definition, and resolution. It is affected by the color vision of whether the drawing object is clearly visible. Therefore, according to the present invention, it is possible to change the amount of calculation for generating a free-form surface / free curve according to the image quality of the drawing object set in the display unit, and to change the drawing accuracy of the free-form surface / free curve It becomes. In addition, when the image quality set in the display unit is high, if the number of control points is generated less than when the image quality is low, the generation of a drawing object whose accurate shape is difficult for the user to recognize is generated. It is possible to reduce the amount of computation.

  The drawing object information acquisition unit may be realized by hardware or a program. Further, the control point generation unit may be realized by hardware or a program. The curved surface generation unit may be realized by hardware or a program.

  Embodiments of a drawing apparatus and a drawing method according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a configuration of a drawing apparatus according to Embodiment 1 of the present invention.

  The present embodiment only needs to include at least the drawing unit 100 and the system information acquisition unit 120, and the presence and configuration of the other blocks are arbitrary. Here, the central control unit 110 performs various processes such as management of the entire system and instructions to each block in the system. The storage unit 130 serves as a work area for the central control unit 110, the drawing unit 100, and the communication unit 150, and functions as a main memory 131 and a frame buffer 132. The display unit 140 is for outputting an image generated according to the present embodiment. The communication unit 150 is for performing communication between the drawing apparatus and an external system via a network or the like.

  The program or data according to the present embodiment may be stored in the storage unit 130 or distributed to the control point generation unit 101 via the network and communication unit 150. The operation unit 160 is for the user to operate the drawing apparatus.

  The system information acquisition unit 120 includes a battery remaining amount information acquisition unit 121, a clock gear ratio information acquisition unit 122, an allocated bandwidth information acquisition unit 123, a bus traffic information acquisition unit 124, a network traffic information acquisition unit 125, and an interrupt frequency information acquisition unit. 126, at least one of them.

  Here, the remaining battery level information acquisition unit 121 recognizes the remaining battery level of the power supply device configured by a battery that supplies power to the drawing unit 100.

  The clock gear ratio information acquisition unit 122 provides a given clock gear ratio or reference for the drawing unit 100 for a given block when the drawing device has a clock gear function that can change the frequency of each block. The clock gear ratio of the drawing unit 100 with respect to the frequency is recognized.

  The allocated bandwidth information acquisition unit 123 recognizes the transfer capacity per unit time for the storage unit 130 of the drawing unit 100.

  The bus traffic information acquisition unit 124 recognizes bus traffic on the bus 170 that couples the drawing unit 100 and the storage unit 130 to each other.

  The network traffic information acquisition unit 125 recognizes the transfer capacity per unit time of the network that transmits and receives data via the communication unit 150.

  The interrupt frequency information acquisition unit 126 recognizes the amount of interrupts per unit time applied to the drawing unit 100 from the central control unit 110, the communication unit 150, the operation unit 160, and the like.

  The drawing unit 100 performs image drawing including free curved surface drawing and free curve drawing based on the central control unit 110 or a program. The drawing unit 100 includes a control point generation unit 101, a curved surface generation unit 102, and an image generation unit 103.

  The control point generation unit 101 is at least one of battery remaining amount information, clock gear ratio information, allocated bandwidth information, bus traffic information, network traffic information, interrupt frequency information obtained from the system information acquisition unit 120, or their A process of changing the number of control points used for generating a free curved surface or a free curve according to the combination is performed.

  Here, the control point is used to determine the shape of a free curve when a free curved surface / free curve is generated by a parametric curve such as a Bezier curve or a spline curve. When a spline curve or its extended form is used as a means for generating a free-form surface / free-form curve, the entire curve is obtained by smoothly connecting (interpolating) between the control points based on the coordinates of the control points. . When a Bezier curve or NURBS (Non Uniform Rational B-Spline) is used as a means of generating a free-form surface / free-form curve, only the first and last control points of the given control points will pass, but the control between them The points are only used to determine the curve shape of the curve.

  The means for determining the number of control points may be realized by hardware in the control point generation unit 101, may be realized by a program in the storage unit 130, or may be realized by a network via the communication unit 150. It may be determined by the data or the program transmitted by.

  The curved surface generator 102 uses the control points generated by the control point generator 101 to generate a free curved surface / free curve.

  The curved surface generation means and the curved surface generation means may be realized by hardware, may be realized by a program in the storage unit 130, or determined by data transmitted by the network via the communication unit 150. Also good.

  The image generation unit 103 generates a shape of a display object using the free curved surface or free curve generated by the curved surface generation unit 102, and performs geometric calculation, light source processing, shading processing, texture generation, filtering processing on the display object. , Α blending processing, fog processing, and other various image generation processing are performed, and processing for storing in the corresponding address of the frame buffer 132 of the storage unit 130 is performed.

  2A, 2 </ b> B, and 2 </ b> C illustrate an example in which control points for generating a free curve are changed according to system information. FIG. 2A shows an image when it is determined by the acquired system information that the conditions are sufficient to draw a high-precision free curve. FIG. 2B shows an image when it is determined that it is difficult to draw a free curve with high accuracy based on the acquired system information, and a free curve is generated with medium accuracy. FIG. 2C shows an image when it is determined that it is difficult to draw a moderate free curve from the acquired system information, and the free curve is generated with low accuracy.

  Here, the condition for drawing is determined from whether or not the drawing update period is in time, the remaining power, and the like.

  In the present embodiment, even when the same display object is generated, if a system condition such as a system resource usage condition satisfies a given condition, high-precision free curve drawing is performed. If the system information does not satisfy the conditions for drawing a high-precision free-form surface / curve, change the accuracy of the free-form surface / free-form curve to medium or low-precision free-form drawing and change the amount of computation. be able to.

  In FIG. 2, three steps of “high” ((A) in the figure), “medium” ((B) in the figure), and “low” ((C) in the figure) are prepared as the curved surface interpolation levels. The description is made with reference to a diagram in which the number of points is approximately half of (A) for (B) and arbitrarily about half of (B) for (C). However, in the present invention, the number of curved surface interpolation levels, the number of control points, and the method of selecting control points to be generated are not limited to this, and a given method may be implemented in hardware, or stored in the storage unit 130 and executed. It may be realized by a program that can be executed, or may be determined by data from the outside via a network. In addition, the system information is compared with the condition every time an image is generated. In the present invention, the timing of determining the curved surface interpolation level according to the system information is not limited to this. It is also possible to change the number of generations.

  FIG. 3 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the remaining battery level and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment.

  If the remaining battery level obtained from the system information acquisition unit 120 is greater than or equal to the reference A, the amount of calculation increases by setting the curved surface interpolation level to “high” and generating a large number of control points. A precision free curve is generated (steps S30, S32, S35).

  If the remaining battery level is greater than or equal to the reference B and less than the reference A, the medium interpolation accuracy is set by setting the curved surface interpolation level to “medium” and generating a moderate number of control points. Are generated (steps S30, S31, S33, S36).

  If the remaining battery level is less than the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step S30). , S31, S34, S37).

  Further, it is determined whether or not to continue image generation within the next image update period (step S38), and if it is determined to be performed, the processing from step S30 to step S37 is repeated.

  In FIG. 3, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a more detailed reference for the range of the remaining battery level and determining the corresponding curved surface interpolation level, the remaining battery level can be reflected in the calculation amount for the free curved surface / free curve more finely. In addition, when the remaining battery level does not meet a given condition, the remaining number of control points is generated so that the drawing accuracy is visibly reduced, so that the user can determine the remaining battery level with the display object drawing accuracy. It is possible to make it possible. In addition, the means for determining the curved surface interpolation level and determining the number of control points generated may be implemented by hardware of a given method or by a program that can be stored in the storage unit 130 and executed. However, it may be determined by data from the outside via a network. Further, even when the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as a means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

  FIG. 4 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the clock gear ratio and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment.

  If the clock gear ratio obtained from the system information acquisition unit 120 is greater than or equal to the reference A, the amount of calculation increases by setting the curved surface interpolation level to “high” and generating a large number of control points. A precision free curve is generated (steps S40, S42, S45).

  If the clock gear ratio is greater than or equal to the reference B but less than the reference A, the curved surface interpolation level is set to “medium”, and the number of control points is generated to a medium level. Are generated (steps S40, S41, S43, S46).

  If the clock gear ratio is less than the reference B, the curved surface interpolation level is set to “low”, and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step S40). , S41, S44, S47).

  Further, it is determined whether or not to continue image generation within the next image update period (step S48), and if it is determined to be performed, the processing from step S40 to step S47 is repeated.

  In FIG. 4, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the clock gear ratio and determining the corresponding curved surface interpolation level, the clock gear ratio can be reflected in the calculation amount for the free curved surface / free curve more finely. In addition, the means for determining the curved surface interpolation level and determining the number of control points generated may be implemented by hardware of a given method or by a program that can be stored in the storage unit 130 and executed. However, it may be determined by data from the outside via a network. Further, even when the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as a means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

  FIG. 5 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the allocated bandwidth and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment.

  If the allocated bandwidth obtained from the system information acquisition unit 120 is equal to or greater than the reference A, the amount of calculation increases by setting the curved surface interpolation level to “high” and generating a large number of control points. A precision free curve is generated (steps S50, S52, S55).

  If the allocated bandwidth is greater than or equal to the reference B and less than the reference A, the surface interpolation level is set to “medium” and the number of control points is moderately generated. Are generated (steps S50, S51, S53, S56).

  If the allocated bandwidth is less than the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step S50). , S51, S54, S57).

  Further, it is determined whether or not to continue image generation within the next image update period (step S58), and if it is determined to be performed, the processing from step S50 to step S57 is repeated.

  In FIG. 5, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the allocated bandwidth and determining the corresponding curved surface interpolation level, the allocated bandwidth can be reflected more finely in the calculation amount for the free curved surface / free curve. In addition, the means for determining the curved surface interpolation level and determining the number of control points generated may be implemented by hardware of a given method or by a program that can be stored in the storage unit 130 and executed. However, it may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

  FIG. 6 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to bus traffic and changing the drawing accuracy of a free curve as an example of the processing flow of this embodiment.

  If the bus traffic obtained from the system information acquisition unit 120 is less than or equal to the reference A, setting the curved surface interpolation level to “high” and generating a large number of control points increases the amount of calculation, but high accuracy Are generated (steps S60, S62, S65).

  If the bus traffic is above the reference A and below the reference B, the curved surface interpolation level is set to “medium” and the number of control points is moderately generated. A medium-precision free curve is generated (steps S60, S61, S63, S66).

  If the bus traffic is above the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step S60). , S61, S64, S67).

  Further, it is determined whether or not to continue image generation within the next image update period (step S68). If it is determined that the image generation is to be performed, the processing from step S60 to step S67 is repeated.

  In FIG. 6, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a more detailed reference for the bus traffic range and determining the corresponding curved surface interpolation level, the bus traffic can be reflected in the calculation amount for the free curved surface / free curve more finely. In addition, the means for determining the curved surface interpolation level and determining the number of control points generated may be implemented by hardware of a given method or by a program that can be stored in the storage unit 130 and executed. However, it may be determined by data from the outside via a network. Further, even when the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as a means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

  FIG. 7 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to network traffic and changing the drawing accuracy of a free curve as an example of the processing flow of this embodiment.

  If the network traffic obtained from the system information acquisition unit 120 is less than or equal to the reference A, setting the curved surface interpolation level to “high” and generating a large number of control points increases the amount of calculation, but high accuracy Are generated (steps S70, S72, S75).

  If the network traffic is above the standard A and below the standard B, the curved surface interpolation level is set to “medium” and the number of control points is generated to a medium level. A medium-precision free curve is generated (steps S70, S71, S73, S76).

  If the network traffic is higher than the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step S70). , S71, S74, S77).

  Further, it is determined whether or not to continue image generation within the next image update period (step S78), and if it is determined to be performed, the processing from step S70 to step S77 is repeated.

  In FIG. 7, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a more detailed reference for the network traffic range and determining the corresponding curved surface interpolation level, the network traffic can be reflected in the calculation amount for the free curved surface / free curve more finely. In addition, the means for determining the curved surface interpolation level and determining the number of control points generated may be implemented by hardware of a given method or by a program that can be stored in the storage unit 130 and executed. However, it may be determined by data from the outside via a network. Further, even when the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as a means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

  FIG. 8 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the interrupt frequency and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment.

  If the interrupt frequency obtained from the system information acquisition unit 120 is equal to or less than the reference A, the curved surface interpolation level is set to “high” and the number of control points is increased, so that the amount of calculation increases, but the high accuracy Are generated (steps S80, S82, S85).

  If the interrupt frequency is higher than the reference A and lower than the reference B, the curved surface interpolation level is set to “medium” and the number of control points is moderately generated, so that the amount of calculation is less than the high accuracy. A medium-precision free curve is generated (steps S80, S81, S83, S86).

  If the interruption frequency is higher than the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step S80). , S81, S84, S87).

  Further, it is determined whether or not to continue image generation within the next image update period (step S88). If it is determined that the image generation is to be performed, the processing from step S80 to step S87 is repeated.

  In FIG. 8, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the interrupt frequency range and determining the corresponding curved surface interpolation level, the interrupt frequency can be reflected in the calculation amount for the free curved surface / free curve more finely. In addition, the means for determining the curved surface interpolation level and determining the number of control points generated may be implemented by hardware of a given method or by a program that can be stored in the storage unit 130 and executed. However, it may be determined by data from the outside via a network. Further, even when the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as a means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

  FIG. 9 shows an example of the processing flow of the present embodiment, in which the number of control points to be generated is controlled according to three types of system information such as the remaining battery level, the clock gear ratio, and the allocated bandwidth, and the drawing accuracy of the free curve is changed. It is a flowchart for demonstrating the flow of this.

  If the remaining battery level obtained from the system information acquisition unit 120 is greater than or equal to reference A, the clock gear ratio is greater than or equal to reference C, and the allocated bandwidth is greater than or equal to reference E (steps S90, S92, S94), the curved surface interpolation level is set to “high”. ”And generating a large number of control points increases the amount of calculation, but generates a highly accurate free curve (steps S96 and S99).

  The remaining battery level is greater than or equal to reference A and the clock gear ratio is greater than or equal to reference C and the allocated bandwidth is greater than or equal to reference F and less than reference E (steps S90, S92, S94, S95), or the remaining battery level is greater than reference A and the clock gear ratio is greater than Reference D or more and less than reference C and the assigned bandwidth is greater than or equal to reference F (steps S90, S92, S93, S95), or the remaining battery level is greater than or equal to reference B and less than reference A, the clock gear ratio is greater than reference D and the assigned bandwidth is F With the above (steps S90, S91, S93, and S95), although the curved surface interpolation level is set to “medium” and the number of control points is moderately generated, the amount of calculation is reduced compared to high accuracy. A precision free curve is generated (steps S97, S9a).

  If the remaining battery level is less than reference B, the clock gear ratio is less than reference D, or the allocated bandwidth is less than reference F (steps S91, S93, S95), the curved surface interpolation level is set to “low” and the number of control points By generating a small amount, a low-precision free curve is generated although the amount of calculation is small (steps S98 and S9b).

  Further, it is determined whether or not to continue image generation within the next image update period (step S9c), and if it is determined to be performed, the processing from step S90 to step S9b is repeated.

  In FIG. 9, the curved surface interpolation level is determined from the three curved surface interpolation levels by the determination step that satisfies the reference ranges of the remaining battery level, the clock gear ratio, and the allocated bandwidth in order. The type of system information to be used, the number of system information, the method of determining the curved surface interpolation level, and the number of curved surface interpolation levels are not limited to this. The method of determining the curved surface interpolation level may be realized by implementing a given method in hardware, or by a program that can be stored in the storage unit 130 and executed, or from outside via a network. It may be determined by data or the like. Furthermore, even if the determination of the curved surface interpolation level is hardware and cannot be changed, a program or network that can be stored and executed in the storage unit 130 as means for determining the number of control points from the determined curved surface interpolation level By implementing using data from the outside via, etc., the method for determining the number of control points can be changed.

(Embodiment 2)
FIG. 10 shows a configuration of a drawing apparatus according to Embodiment 2 of the present invention.

  In this figure, the present embodiment only needs to include at least the drawing unit 100 and the drawing object information acquisition unit 220, and the presence and configuration of the other blocks are arbitrary. As in the case of the first embodiment, the central control unit 110 performs various processes such as management of the entire system and instructions to each block in the system. The storage unit 130 serves as a work area for the central control unit 110, the drawing unit 100, and the communication unit 150, and functions as a main memory 131 and a frame buffer 132. The display unit 140 is for outputting an image generated according to the present embodiment. The communication unit 150 is for performing communication between the drawing apparatus and an external system via a network or the like.

  The program or data according to the present embodiment may be stored in the storage unit 130 or distributed to the control point generation unit 101 via the network and communication unit 150. The operation unit 160 is for the user to operate the drawing apparatus.

  The drawing object information acquisition unit 220 includes a moving speed information acquisition unit 221, a display area information acquisition unit 222, a target object distance information acquisition unit 223, a drawing object size information acquisition unit 224, a drawing object number information acquisition unit 225, and display period information. It includes at least one of an acquisition unit 226 and a display device image quality information acquisition unit 227.

  Here, the movement speed information acquisition unit 221 recognizes the movement speed of the drawing object generated by the drawing unit 100, that is, the movement distance per unit time.

  When the virtual three-dimensional space (virtual two-dimensional space) recognized by the user through the display unit 140 is divided into several regions, the display region information acquisition unit 222 draws the drawing object generated by the drawing unit 100 in which region. It is what recognizes.

  The attention object distance information acquisition unit 223 recognizes a distance from a specific object that the user seems to be gazing from among the drawing objects drawn in the virtual three-dimensional space (virtual two-dimensional space).

  The drawing object size information acquisition unit 224 recognizes the size of the drawing object in the virtual three-dimensional space (virtual two-dimensional space).

  The drawing object number information acquisition unit 225 recognizes the number of drawing objects drawn on the virtual three-dimensional space (virtual two-dimensional space).

  The display period information acquisition unit 226 recognizes an elapsed time after the drawing object drawn by the drawing unit 100 is drawn on the display unit 140 and recognized by the user as being in a virtual three-dimensional space (virtual two-dimensional space). It is.

  The display device image quality information acquisition unit 227 is set to the display unit 140 from the central control unit 110, the communication unit 150, the operation unit 160, or the like, or brightness, contrast, The image quality of the display unit 140 is recognized from the resolution, color gradation, and the like.

  The drawing unit 100 performs image drawing including free curved surface drawing and free curve drawing based on the central control unit 110 or a program. The drawing unit 100 includes a control point generation unit 101, a curved surface generation unit 102, and an image generation unit 103. The control point generation unit 101 obtains the moving speed information of the drawing object obtained from the drawing object information acquisition unit 220, the display area information of the drawing object, the distance information of the drawing object from the target object, the number information of the drawing object, and the drawing object information. Processing for changing the number of control points used for generating a free-form surface or a free-form curve according to at least one of size information, display period information of a drawing object, or image quality information of a display unit, or a combination thereof. Is what you do.

  Here, the control points are the same as those described in the first embodiment.

  FIG. 2 is also used in this embodiment. 2A, 2B, and 2C illustrate an example in which control points for generating a free curve are changed in accordance with drawing object information. FIG. 2A shows an image when it is determined by the acquired drawing object information that drawing of a high-precision free curve is drawn within a predetermined drawing update period. In FIG. 2B, it is determined that drawing accuracy is not required until drawing a high-precision free curve within a predetermined drawing update period based on the acquired drawing object information, and a free curve is generated with a medium accuracy. The image is shown. FIG. 2C shows a case where it is determined that drawing accuracy is not required until drawing of a moderate free curve within a predetermined drawing update period based on the acquired drawing object information, and a free curve is generated with low accuracy. Represents the image.

  In the second embodiment, even when an image of the same drawing object is generated, if the drawing object information satisfies a given condition, high-precision free-form / free-form drawing is performed. If the drawing object information does not satisfy the conditions for drawing a high-precision free-form surface / curve, the free-form surface / free-curve accuracy is changed to medium- or low-precision free-form drawing, and the amount of computation is changed. can do.

  In FIG. 2, the drawing object information is compared with the condition every time the image is generated. However, in the present invention, the timing of determining the curved surface interpolation level according to the drawing object information is not limited to this, but only in a predetermined cycle. It is also possible to change the number of control points generated according to the drawing object information.

  FIG. 11 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the moving speed of the drawing object and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment.

  If the moving speed of the drawing object obtained from the drawing object information acquisition unit 220 is less than the reference A (slow), the curved surface interpolation level is set to “high”, and the number of control points is generated to generate a large amount of computation. However, a high-precision free curve is generated (steps T30, T32, T35).

  If the moving speed of the drawing object is not less than the reference A and less than the reference B, the curved surface interpolation level is set to “medium” and the number of control points is moderately generated. A medium-precision free curve is generated (steps T30, T31, T33, T36).

  If the movement speed of the drawing object is equal to or higher than the reference B (fast), the curved surface interpolation level is set to “low”, and the number of control points is reduced to generate a low-precision free curve, although the calculation amount is small. (Steps T30, T31, T34, T37).

  Further, it is determined whether or not to continue image generation within the next image update period (step T38). If it is determined that the curved surface generation processing is to be performed, the processing from step T30 to step T37 is repeated.

  In FIG. 11, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of movement speed of the drawing object and determining the corresponding curved surface interpolation level, the movement speed of the drawing object can be reflected in the calculation amount for the free curved surface / free curve more finely. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed.

  FIG. 12 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the display area information of the drawing object and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment. .

  If the area where the drawing object obtained from the drawing object information acquisition unit 220 is drawn is A, the curved surface interpolation level is set to “high” and the number of control points is generated to increase the amount of calculation. However, a high-precision free curve is generated (steps T40, T42, T45).

  If the area where the drawing object is drawn is B, setting the curved surface interpolation level to “medium” and generating a moderate number of control points will reduce the amount of computation compared to high precision, but the medium precision Are generated (steps T40, T41, T43, T46).

  If the area where the drawing object is drawn is C, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve, although the amount of calculation is small. (Steps T40, T41, T44, T47).

  Further, it is determined whether or not to continue image generation within the next image update period (step T48), and if it is determined to be performed, the processing from step T40 to step T47 is repeated.

  In FIG. 12, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the area where the drawing object is drawn and determining the corresponding curved surface interpolation level, the area where the drawing object is drawn more finely can be used for the calculation of free curved surface and free curve It can be reflected. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed.

  FIG. 13 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the distance between the drawing object and the object of interest and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment. It is.

  If the distance to the object of interest obtained from the drawing object information acquisition unit 220 is less than (or close to) the reference A, the curved surface interpolation level is set to “high” and the number of control points is generated, thereby increasing the amount of computation Generate a high-precision free curve (steps T50, T52, T55).

  If the distance to the object of interest is greater than or equal to the reference A and less than the reference B, the amount of calculation is reduced compared to high accuracy by setting the curved surface interpolation level to “medium” and generating a moderate number of control points. A medium-precision free curve is generated (steps T50, T51, T53, T56).

  If the distance to the object of interest is greater than or equal to the reference B (far), the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve, although the amount of computation is small. (Steps T50, T51, T54, T57).

  Further, it is determined whether or not to continue image generation within the next image update period (step T58), and if it is determined to be performed, the processing from step T50 to step T57 is repeated.

  In FIG. 13, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the distance to the object of interest and determining the corresponding curved surface interpolation level, the distance to the object of interest can be reflected in the calculation amount for the free curved surface / free curve more finely. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed.

  FIG. 14 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the number information of drawing objects and changing the drawing accuracy of a free curve as an example of the processing flow of this embodiment.

  If the number of drawing objects obtained from the drawing object information acquisition unit 220 is less than the reference A, the calculation amount increases by setting the curved surface interpolation level to “high” and generating a large number of control points. A high-precision free curve is generated (steps T60, T62, T65).

  If the number of drawing objects is greater than or equal to the reference A and less than the reference B, the curved surface interpolation level is set to “medium” and the number of control points is generated to a medium level. A precision free curve is generated (steps T60, T61, T63, T66).

  If the number of drawing objects is greater than or equal to the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step) T60, T61, T64, T67).

  Further, it is determined whether or not to continue image generation within the next image update period (step T68). If it is determined that the image generation is to be performed, the processing from step T60 to step T67 is repeated.

  In FIG. 14, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the number of drawing objects and determining the corresponding curved surface interpolation level, the number of drawing objects can be reflected in the calculation amount for the free curved surface / free curve more finely. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed. Further, as a method for detecting the number of drawing objects, there is a method in which a representative point selected from a drawing object under a given condition is counted by a counter.

  FIG. 15 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the size information of the drawing object and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment. .

  If the size of the drawing object obtained from the drawing object information acquisition unit 220 is greater than or equal to the reference A, the amount of calculation increases by setting the curved surface interpolation level to “high” and generating a large number of control points. Generates a high-precision free curve (steps T70, T72, T75).

  If the size of the drawing object is greater than or equal to the reference B and less than the reference A, the surface interpolation level is set to “medium” and the number of control points is moderately generated. A medium-precision free curve is generated (steps T70, T71, T73, T76).

  If the size of the drawing object is less than the reference B, the curved surface interpolation level is set to “low” and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small ( Steps T70, T71, T74, T77).

  Further, it is determined whether or not to continue image generation within the next image update period (step T78). If it is determined that the image generation is to be performed, the processing from step T70 to step T77 is repeated.

  In FIG. 15, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the size of the drawing object and determining the corresponding curved surface interpolation level, the size of the drawing object can be reflected in the calculation amount for the free curved surface / free curve more finely. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed.

  FIG. 16 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the display period information of the drawing object and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment. .

  If the display period of the drawing object obtained from the drawing object information acquisition unit 220 is equal to or longer than the reference A, the amount of calculation increases by setting the curved surface interpolation level to “high” and generating a large number of control points. Generates a high-precision free curve (steps T80, T82, T85).

  If the display period of the drawing object is less than the reference A and greater than or equal to the reference B, the amount of calculation is reduced compared to the high accuracy by setting the curved surface interpolation level to “medium” and generating a moderate number of control points. However, a medium-precision free curve is generated (steps T80, T81, T83, T86).

  If the display period of the drawing object is less than the reference B, the curved surface interpolation level is set to “low”, and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small ( Steps T80, T81, T84, T87).

  Further, it is determined whether or not to continue image generation within the next image update period (step T88), and if it is determined to be performed, the processing from step T80 to step T87 is repeated.

  In FIG. 16, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of the display period of the drawing object and determining the corresponding curved surface interpolation level, the display period of the drawing object can be reflected in the calculation amount for the free curved surface / free curve more finely. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed. As a method for detecting a display period, a method is used in which a counter is incremented by a counter every certain screen update period from the time when a representative point selected from a drawing object under a given condition is placed in a display area (such as in a frame buffer). and so on.

  FIG. 17 is a flowchart for explaining the flow of processing for controlling the number of control points generated according to the image quality information of the display unit and changing the drawing accuracy of the free curve as an example of the processing flow of this embodiment.

  If the image quality of the display unit obtained from the drawing object information acquisition unit 220 is equal to or higher than the reference A, the amount of calculation increases by setting the curved surface interpolation level to “high” and generating a large number of control points. A high-precision free curve is generated (steps T90, T92, T95).

  If the image quality of the display unit is less than reference A and greater than or equal to reference B, the amount of calculation is reduced compared to high accuracy by setting the curved surface interpolation level to “medium” and generating a moderate number of control points. However, a medium-precision free curve is generated (steps T90, T91, T93, T96).

  If the image quality of the display unit is less than the reference B, the curved surface interpolation level is set to “low”, and the number of control points is reduced to generate a low-precision free curve although the amount of calculation is small (step) T90, T91, T94, T97).

  Further, it is determined whether or not to continue image generation within the next image update period (step T98). If it is determined that the image generation is to be performed, the processing from step T90 to step T97 is repeated.

  In FIG. 17, three levels of high accuracy, medium accuracy, and low accuracy are prepared as curved surface interpolation levels. However, in the present invention, the number of curved surface interpolation levels is not limited to this. By setting a finer reference for the range of image quality of the display unit and determining the corresponding curved surface interpolation level, the image quality of the display unit can be reflected in the calculation amount for the free curved surface / free curve more finely. Further, the determination means of the curved surface interpolation level and the control point generation number determination means may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, It may be determined by data from the outside via a network. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed.

  FIG. 18 illustrates, as an example of the processing flow of the present embodiment, the number of control points generated according to three drawing object information including the moving speed of the drawing object, the area where the drawing object is drawn, and the distance to the object of interest. FIG. 6 is a flowchart for explaining the flow of processing for changing the drawing accuracy of a free curve.

  If the movement speed of the drawing object obtained from the drawing object information acquisition unit 220 is less than the reference A, the size of the drawing object is the reference C or more, and the distance from the object of interest is less than the reference E (steps T100, T102, T104). By setting the curved surface interpolation level to “high” and generating a large number of control points, a high-precision free curve is generated although the amount of calculation increases (steps T106 and T109).

(A) The movement speed of the drawing object is less than the reference A, the size of the drawing object is the reference C or more, and the distance from the object of interest is the reference E or more and less than the reference F (steps T100, T102, T104, T105),
(B) or the moving speed of the drawing object is less than the reference A, the size of the drawing object is the reference D or more and less than the reference C, and the distance from the object of interest is less than the reference F (steps T100, T102, T103, T105),
(C) or if the movement speed of the drawing object is greater than or equal to reference A and less than reference B, the size of the drawing object is greater than or equal to reference D and the distance from the object of interest is less than F (steps T100, T101, T103, T105) By setting the curved surface interpolation level to “medium” and generating a moderate number of control points, a medium accuracy free curve is generated although the amount of calculation is smaller than that of high accuracy (steps T107 and T10a).

  If the moving speed of the drawing object is greater than or equal to the reference B, the size of the drawing object is less than the reference D, or the distance from the object of interest is greater than or equal to the reference F (steps T101, T103, T105), the curved surface interpolation level is “low”. And generating a small number of control points, a low-precision free curve is generated although the amount of calculation is small (steps T108 and T10b).

  Further, it is determined whether or not to continue image generation within the next image update period (step T10c), and if it is determined to be performed, the processing from step T100 to step T10b is repeated.

  In FIG. 18, the curved surface interpolation level is determined from the three curved surface interpolation levels by a determination step that satisfies the reference ranges of the moving speed of the drawn object, the size of the drawn object, and the distance to the object of interest in order. The types of drawing object information and the number of drawing object information used for determining the curved surface interpolation level, the method of determining the curved surface interpolation level, and the number of curved surface interpolation levels are not limited to this. The method of determining the curved surface interpolation level may be realized by a hardware method of a given method, or may be realized by a program that can be stored and executed in a storage unit, or data from the outside via a network. It may be determined by such as. Furthermore, even if the determination of the curved surface interpolation level is implemented in hardware and cannot be changed, the program is stored via a program or network that can be stored in the storage unit and executed as a means for determining the number of control points from the determined curved surface interpolation level. By implementing using external data or the like, the method for determining the number of control points can be changed.

  FIG. 19 shows that when the drawing object information is any one of drawing object moving speed, drawing object display area information, drawing object distance information, drawing object number information, and drawing object display period information. As an example of the determination of the representative point of the drawing object used for the drawing, there is a method in which the center of gravity of the polygon formed by the control points used when drawing the free-form surface / free-curve with the lowest accuracy is used as the representative point of the drawing object.

  In FIG. 19, a polygon made up of four points (Q0, Q1, Q2, Q3) used for drawing a free-form surface / curve with the lowest accuracy is cut by a diagonal line to obtain a centroid (Q4) by making a triangle. However, other methods such as a method of calculating from the position vector may be used. In addition, the method of determining the center of gravity may be realized by implementing a given method in hardware, or by a program that can be stored and executed in a storage unit, or data from the outside via a network. It may be determined by such as.

  FIG. 20 shows that when the drawing object information is one of drawing object movement speed, drawing object display area information, drawing object distance information, drawing object number information, and drawing object display period information. As an example of the determination of the representative point of the drawing object used in the method, a point selected under a given condition from the control points used when drawing the free-form surface / free-curve with the lowest accuracy is used as the representative point. In the example, four control points (Q0, Q1, Q2) common to all free curve generation from FIG. 20 (A) in which a free curve is drawn with the highest accuracy to FIG. 20 (B) in which the free curve is drawn with the lowest accuracy. Q3) Although all the representative points are used as representative points, the representative points may be a part of control points used when drawing with the minimum accuracy. In addition, the method for determining the representative point from among the minimum control points may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, or a network It may be determined by data from the outside through the network.

  FIG. 21 shows an example of detection using a linear distance of a representative point of a drawing object as a distance used when the drawing object information is one of the moving speed of the drawing object and the distance information of the drawing object with respect to the object of interest. is there. The representative point of the drawing object P130 is Q2, the representative point of the drawing object P131 is Q5, and the straight line distance L between the two points is the straight line distance between the drawing objects P130 and P131.

  In FIG. 21, one point selected under given conditions is selected from the control points used for free-form surface / free-curve drawing with the lowest accuracy as the representative point of the drawing objects P130 and P131. Is not limited to this. In FIG. 21, only the xy direction is shown as the distance between two points, but it may be a distance including the depth direction. In addition, the calculation of the distance between the representative points may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in the storage unit, or from the outside via a network. It may be determined based on the data.

  FIG. 22 shows a drawing object when the drawing object has a plurality of representative points as the distance used when the drawing object information is either the moving speed of the drawing object or the distance information of the drawing object with respect to the object of interest. This is an example of detection using the average value of the straight line distances of the representative points. The representative points of the drawing object P140 are Q0, Q1, Q2, and Q3, the representative points of the drawing object P141 are Q4, Q5, Q6, and Q7, the linear distances L0 of Q0 and Q7, and the linear distances L1 and Q2 of Q1 and Q4, An average value L (= (L0 + L1 + L2 + L3) / 4) of the straight line distance L2 between Q5 and the straight line distance L3 between Q3 and Q6 is set as a straight line distance between the drawing objects P140 and P141.

  In FIG. 22, as the representative points of the drawing objects P140 and P141, four points selected under given conditions are selected from the control points used in the free-form curved surface / free-curve drawing with the lowest accuracy. Is not limited to this. In FIG. 22, only the xy direction is shown as the distance between two points, but the distance including the depth direction may be used. The association of the representative points between the drawing objects, the calculation of the distance between the representative points, and the calculation of the average distance may be implemented by a given method as hardware, or stored in the storage unit and executed. It may be realized by a program, or may be determined by data from the outside via a network.

  FIG. 23 shows the method of determining the surface interpolation level when the drawing object has a plurality of representative points when the drawing object information is the display area information of the drawing object. In this example, the average value of the curved surface interpolation levels is set as the curved surface interpolation level of the drawing object. When the representative points of the drawing object P150 are seven points Q0 to Q6, the representative points Q0, Q1, Q2, and Q3 belong to the display region R151, the representative points Q4 and Q5 belong to the display region R152, and the representative point Q6 It belongs to the display area R153. When the curved surface interpolation level of the display region R151 is A, the curved surface interpolation level of the display region R152 is B, and the curved surface interpolation level of the display region R153 is C, the curved surface interpolation levels A, B of the display region to which the representative points Q0 to Q6 belong. The average value D of C, that is, (A * 4 + B * 2 + C * 1) / 7 is set as the curved surface interpolation level of the drawing object P150.

  When the average value D does not become the numerical value of the preset curved surface interpolation level, the closest curved surface interpolation level is set as the curved surface interpolation level of the drawing object.

  Note that the calculation of the average value of the curved surface interpolation level may be realized by hardware of a given method, or may be realized by a program that can be stored and executed in a storage unit, or may be performed externally via a network. It may be determined by data from

  FIG. 24 shows the method of determining the surface interpolation level when the drawing object has a plurality of representative points when the drawing object information is the display area information of the drawing object. In this example, the next control point generation number is set in accordance with the curved surface interpolation level. When the representative points of the drawing object P160 are seven points Q0 to Q6, the representative points Q0, Q1, Q2, and Q3 belong to the display region R161, the representative points Q4 and Q5 belong to the display region R162, and the representative point Q6 It belongs to the display area R163. When the curved surface interpolation level of the display region R161 is A, the curved surface interpolation level of the display region R162 is B, and the curved surface interpolation level of the display region R163 is C, the representative points Q0, Q1, Q2, and Q3 follow the curved surface interpolation level A. The representative points Q4 and Q5 are determined in accordance with the curved surface interpolation level B, and are determined in the next screen updating period. The representative point 6 is determined in accordance with the curved surface interpolation level C. Generated during the screen update period. For the control points that are not generated in the curved surface interpolation level determination step, a method may be adopted in which the curved surface interpolation levels of neighboring points are used.

  FIG. 25 shows a method of drawing a free curve with minimum accuracy as a method of detecting the size of the drawing object used when the drawing object information is either the size information of the drawing object or the distance information of the drawing object with respect to the object of interest. This is an example in which the distance between two control points used at the time is the size of the drawing object. When the control points for drawing the drawing object P170 with the minimum accuracy are seven points Q0 to Q6, the linear distance L between the two points Q3 and Q6 selected according to a given condition is set as the size of the drawing object P170.

  The selection of the two control points used for the size determination and the calculation of the straight line distance between the two points may be implemented by hardware of a given method, or a program that can be stored and executed in the storage unit Or may be determined by data from the outside via a network. Further, when the drawing object information is the distance information between the drawing object and the target object, the target object may be selected as a target object if the size of the drawing object satisfies a given condition.

  Note that the determination of whether the size of the drawing object satisfies the condition of the object of interest may be realized by implementing a given method in hardware or by a program that can be stored and executed in the storage unit. It may be good or may be determined by data from the outside via the network.

  As described above, the drawing apparatus and drawing method according to the present invention controls the number of control points for generating a free-form surface or free-form curve based on system information, and can be freely controlled by the amount of calculation according to the system status. Since a curved surface / free curve is generated, it is useful as a technique for generating a free curved surface or a free curve within a given drawing update period.

  The drawing apparatus and drawing method according to the present invention controls the number of control points for generating a free curved surface or a free curve based on drawing object information, and calculates the free curved surface Since a free curve is generated, it is useful as a technique for generating a free curved surface or a free curve within a given drawing update period.

1 is a block diagram showing an example of the configuration of a drawing apparatus according to Embodiment 1 of the present invention. In the drawing apparatus of Embodiment 1 and 2 of this invention, explanatory drawing of the example from which the number of control points produced | generated according to system information and drawing object information, and an image differ In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to a battery remaining charge. In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to a clock gear ratio. In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to an allocated bandwidth. In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to bus traffic. In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to network traffic. In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to interruption frequency. In the drawing apparatus of Embodiment 1 of this invention, the flowchart regarding changing the number of control points according to several system information. The block diagram which shows the example of a structure of the drawing apparatus in Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the moving speed of the drawing object of Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the area | region where the drawing object of Embodiment 2 of this invention is drawn The flowchart for demonstrating changing the number of control points according to the distance with the attention object of Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the number of the drawing objects of Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the magnitude | size of the drawing object of Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the display period of the drawing object of Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the image quality of the display part of Embodiment 2 of this invention. The flowchart for demonstrating changing the number of control points according to the some drawing object information of Embodiment 2 of this invention The figure for demonstrating the method to determine the representative point of the drawing object of Embodiment 2 of this invention The figure for demonstrating the method to determine the representative point of the drawing object of Embodiment 2 of this invention The figure for demonstrating the method to detect the distance between the drawing objects of Embodiment 2 of this invention. The figure for demonstrating the method to detect the distance between the drawing objects of Embodiment 2 of this invention. The figure for demonstrating the method to determine the curved surface interpolation level according to the display area of the drawing object of Embodiment 2 of this invention The figure for demonstrating the method to determine the curved surface interpolation level according to the display area of the drawing object of Embodiment 2 of this invention The figure for demonstrating the method to detect the magnitude | size of the drawing object of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Drawing part 101 Control point production | generation part 102 Curved surface production | generation part 103 Image generation part 110 Central control part 120 System information acquisition part 121 Battery remaining charge information acquisition part 122 Clock gear ratio information acquisition part 123 Allocation bandwidth information acquisition part 124 Bus traffic information Acquisition unit 125 Network traffic information acquisition unit 126 Interrupt frequency information acquisition unit 130 Storage unit 131 Main memory 132 Frame buffer 140 Display unit 150 Communication unit 160 Operation unit 170 Bus 220 Drawing object information acquisition unit 221 Movement speed information acquisition unit 222 Drawing display area Information acquisition unit 223 Attention object distance information acquisition unit 224 Drawing object size information acquisition unit 225 Drawing object number information acquisition unit 226 Display period information acquisition unit 227 Display device image quality information acquisition unit

Claims (68)

An information acquisition unit for acquiring system information or drawing object information;
A control point generator that sets a curved surface interpolation level for determining the number of control points for generating a curved surface or a curve according to the acquired information and generates the control point according to the curved surface interpolation level;
A curved surface generation unit that generates a curved surface based on the control points,
A drawing apparatus characterized by dynamically changing the amount of curved surface drawing of a display object based on the acquired information. The information acquisition unit is a system information acquisition unit for acquiring system information;
The control point generation unit sets a curved surface interpolation level for determining the number of control points for generating a curved surface or a curve according to the system information, and generates the control point according to the curved surface interpolation level.
The curved surface generation unit performs curved surface generation based on the control points,
The drawing apparatus according to claim 1, wherein the calculation amount of curved surface drawing of a display object is dynamically changed based on the system information.   The drawing apparatus according to claim 2, wherein the system information acquisition unit includes a battery remaining amount information acquiring unit that acquires a remaining battery level, and the system information is the remaining battery level.   The drawing apparatus according to claim 2, wherein the system information acquisition unit includes a clock gear ratio information acquisition unit that acquires a clock gear ratio, and the system information is the clock gear ratio.   The drawing apparatus according to claim 2, wherein the system information acquisition unit includes an allocation bandwidth information acquisition unit that acquires allocation bandwidth information, and the system information is the allocation bandwidth.   The drawing apparatus according to claim 2, wherein the system information acquisition unit includes a bus traffic information acquisition unit that acquires a bus traffic amount, and the system information is the bus traffic amount.   The drawing apparatus according to claim 2, wherein the system information acquisition unit includes a network traffic information acquisition unit that acquires a network traffic amount, and the system information is the network traffic amount.   The drawing apparatus according to claim 2, wherein the system information acquisition unit includes an interrupt frequency information acquisition unit that acquires an interrupt frequency for the drawing apparatus, and the system information is the interrupt frequency information. The system information acquisition unit includes a battery remaining amount information acquisition unit that acquires a remaining battery level, a clock gear ratio information acquisition unit that acquires a clock gear ratio, an allocated bandwidth information acquisition unit that acquires allocated bandwidth information, and a bus traffic amount. 2 or more of a bus traffic information acquisition unit for acquiring network traffic information acquisition unit for acquiring network traffic volume, or an interrupt frequency information acquisition unit for acquiring interrupt frequency for a drawing device,
The system information comprises two or more of the remaining battery level, the clock gear ratio, the allocated bandwidth, the bus traffic volume, the network traffic volume, or the interrupt frequency information. The drawing apparatus described in 1.   The drawing apparatus according to any one of claims 2 to 9, wherein the curved surface interpolation level and the number of control points are set depending on whether the system information is higher or lower than a preset value. .   The drawing apparatus according to claim 2, wherein the calculation amount is changed stepwise according to the system information.   The drawing apparatus according to claim 2, wherein the calculation amount is determined by the curved surface interpolation level.   The drawing apparatus according to claim 2, wherein the calculation amount is determined by the number of the control points.   The drawing apparatus according to claim 2, wherein the calculation amount is determined by the curved surface interpolation level and the number of control points. The information acquisition unit is a drawing object information acquisition unit for acquiring drawing object information;
The control point generation unit sets a surface interpolation level for determining the number of control points for generating a curved surface or a curve according to the drawing object information, and generates the control point according to the surface interpolation level.
The curved surface generation unit performs curved surface generation based on the control points,
The drawing apparatus according to claim 1, wherein the calculation amount of curved surface drawing of a display object is dynamically changed based on the drawing object information.   The drawing object information generation unit includes a movement speed information acquisition unit that acquires a movement speed of a drawing object, and the object display information is a movement speed of the drawing object. Drawing device.   The drawing object information acquisition unit includes a display area information acquisition unit that acquires a display area of the drawing object, and the object display information is a display area of the drawing object. Drawing device.   The drawing object information acquisition unit includes a target object distance information acquisition unit that acquires distance information indicating distance information between a drawing object and a predetermined target object, and the object display information is the distance information. The drawing apparatus according to claim 15, wherein:   The drawing object information acquisition unit includes a drawing object number information acquisition unit that acquires number information of drawing objects, and the object display information is number information of the drawing objects. The drawing apparatus described.   The drawing object information acquisition unit includes a drawing object size information acquisition unit that acquires size information of a drawing object, and the object display information is size information of the drawing object. Item 16. The drawing device according to Item 15.   The drawing object information acquisition unit includes a display period information acquisition unit that acquires display period information of a drawing object, and the object display information is display period information of the drawing object. The drawing apparatus described in 1.   16. The drawing object information acquisition unit includes a display device image quality information acquisition unit that acquires image quality information of a display unit, and the object display information is the drawing object image quality information. Drawing device. The object information acquisition unit includes a movement speed information acquisition unit that acquires a movement speed of the drawing object, a display area information acquisition unit that acquires a display area of the drawing object, distance information between the drawing object and a predetermined target object, and Object distance information acquisition unit for acquiring distance information indicating the number of objects, drawing object number information acquisition unit for acquiring the number information of drawing objects, drawing object size information acquisition unit for acquiring drawing object size information, and display of drawing objects Two or more of a display period information acquisition unit that acquires period information or a display device image quality information acquisition unit that acquires image quality information of the display unit,
The drawing object display information includes a movement speed of the drawing object, a display area of the drawing object, distance information indicating distance information between the drawing object and a predetermined object of interest, number information of the drawing object, the drawing The drawing apparatus according to claim 15, comprising two or more of object size information, the display period information, and image quality information of the display unit.   24. The curved surface interpolation level and the number of control points are set according to whether the drawing object display information is higher or lower than a preset value. Drawing device.   The drawing apparatus according to any one of claims 15 to 22, wherein the calculation amount is changed stepwise according to the drawing object display information.   The drawing apparatus according to claim 15, wherein the calculation amount is determined by the curved surface interpolation level.   26. The drawing apparatus according to claim 15, wherein the calculation amount is determined by the number of the control points.   The drawing apparatus according to any one of claims 15 to 25, wherein the calculation amount is determined by the curved surface interpolation level and the number of control points.   29. The drawing apparatus according to claim 15, wherein the drawing object information acquisition unit determines one or more representative points for each drawing object, wherein the representative points are A drawing apparatus, characterized in that the center of gravity of a figure formed by all or part of the control points generated by the control point generator is used.   29. The drawing apparatus according to claim 15, wherein the drawing object information acquisition unit determines one or more representative points for each drawing object, wherein the representative points are The drawing apparatus, wherein an average distance from all or a part of the control points generated by the control point generator is the shortest point.   29. The drawing apparatus according to claim 15, wherein the drawing object information acquisition unit determines one or more representative points for each drawing object, wherein the representative points are A drawing characterized in that it is selected from the generated control points under a given condition even when drawing a free-form surface / free-curve with minimum accuracy from all or part of the control points generated by the control point generation unit. apparatus. The drawing apparatus according to any one of claims 15 to 28, wherein a linear distance that the representative point has moved in a certain time is defined as a movement distance,
A drawing apparatus, wherein the moving speed of the drawing object is detected by dividing the moving distance by the predetermined time.   The drawing apparatus according to any one of claims 15 to 28, wherein an average of linear distances in which the control points have moved in a fixed time is defined as a moving distance, and the moving distance is divided by the fixed time. A drawing apparatus characterized by detecting a moving speed of a drawing object.   29. The drawing apparatus according to claim 15, wherein an average value of curved surface interpolation levels of a display area to which the representative point of a drawing object belongs is set as a curved surface interpolation level of the entire drawing object. Characteristic drawing device.   29. The drawing apparatus according to claim 15, wherein the curved surface interpolation level of the display area to which the most representative points of the drawn object belong is set as the curved surface interpolation level of the entire drawn object. A drawing device.   29. The drawing apparatus according to claim 15, wherein the curved surface interpolation level of the display area to which each of the representative points of the drawing object belongs is set as a curved surface interpolation level for a control point near the representative point. The drawing apparatus is characterized in that each control point is thinned out by a control point generation unit according to a curved surface interpolation level.   29. The drawing apparatus according to claim 15, wherein the representative point draws a free-form surface / free-curve with minimum accuracy from all or a part of the control points generated by the control point generator. A drawing apparatus characterized in that a linear distance between two points selected under a given condition from control points of the same drawing object generated in this case is used as the size information of the drawing object.   29. The drawing apparatus according to claim 15, wherein the representative point is a free-form surface / free-curve with the lowest accuracy among all or a part of the control points generated by the control point generator. When a distance straight line between two points selected under a given condition from a control point of the same drawing object that is generated also satisfies the given condition, that drawing object is set as the noted object. The drawing apparatus.   29. The drawing apparatus according to claim 15, wherein a number counted by a counter that counts the representative point that satisfies a given condition from the representative point is used as the number information of the drawing object. A drawing apparatus characterized by that.   The drawing apparatus according to any one of claims 15 to 28, wherein a numerical value obtained by a counter that counts up every certain screen update period while the representative point of the drawing object is in the display area. A drawing apparatus, characterized in that the drawing object information is displayed as display period information. Obtaining system information or drawing object information;
Determining a surface interpolation level for generating a curved surface or a curve according to the acquired information and generating a control point;
Performing curved surface generation based on the control points;
A step of dynamically changing a calculation amount of curved surface drawing of a display object based on the acquired information. Get system information,
A control point is generated by determining a surface interpolation level for generating a curved surface or a curve according to the system information,
A curved surface is generated based on the control points,
42. The drawing method according to claim 41, wherein a calculation amount of curved surface drawing of a display object is dynamically changed based on the system information.   43. The drawing method according to claim 42, wherein the system information is a remaining battery level.   43. The drawing method according to claim 42, wherein the system information is a clock gear ratio.   43. The drawing method according to claim 42, wherein the system information is an allocated bandwidth.   43. The drawing method according to claim 42, wherein the system information is a bus traffic amount.   43. The drawing method according to claim 42, wherein the system information is a network traffic amount.   43. The drawing method according to claim 42, wherein the system information is an interrupt frequency for the drawing apparatus.   43. The system information according to claim 42, wherein the system information includes any two or more of a remaining battery level, a clock gear ratio, an allocated bandwidth, an amount of bus traffic, an amount of network traffic, and an interrupt frequency for a drawing device. Drawing method.   50. The drawing method according to claim 42, wherein the curved surface interpolation level and the number of control points are set depending on whether the system information is higher or lower than a preset value. .   50. The drawing method according to claim 42, wherein the calculation amount is changed stepwise according to the system information.   52. The drawing method according to claim 42, wherein the calculation amount is determined by the curved surface interpolation level.   52. The drawing method according to claim 42, wherein the calculation amount is determined by the number of the control points.   52. The drawing method according to claim 42, wherein the calculation amount is determined by the curved surface interpolation level and the number of control points. Get drawing object display information
Determine a curved surface interpolation level for generating a curved surface or a curve according to the drawing object display information to generate a control point,
A curved surface is generated based on the control points,
42. The drawing method according to claim 41, wherein a calculation amount of curved surface drawing of a display object is dynamically changed based on the drawing object display information.   The drawing method according to claim 55, wherein the drawing object display information is a moving speed of the drawing object.   The drawing method according to claim 55, wherein the drawing object display information is a display area of a drawing object.   56. The drawing method according to claim 55, wherein the drawing object display information is distance information indicating distance information between the drawing object and a predetermined object of interest.   The drawing method according to claim 55, wherein the drawing object display information is number information of drawing objects.   The drawing method according to claim 55, wherein the drawing object display information is size information of a drawing object.   The drawing method according to claim 55, wherein the drawing object display information is display period information of a drawing object.   The drawing method according to claim 55, wherein the drawing object display information is image quality information of a display unit.   The drawing object display information includes a movement speed of the drawing object, a display area of the drawing object, distance information indicating distance information between the drawing object and a predetermined object of interest, number information of the drawing object, the drawing The drawing method according to claim 55, comprising at least two of object size information, the display period information, and image quality information of the display unit.   64. The curved surface interpolation level and the number of control points are set according to whether the drawing object display information is higher or lower than a preset value. Drawing method.   64. The drawing method according to any one of claims 55 to 63, wherein the calculation amount is changed stepwise according to the drawing object display information.   64. The drawing method according to claim 55, wherein the calculation amount is determined by the curved surface interpolation level.   64. The drawing method according to claim 55, wherein the calculation amount is determined by the number of the control points. 64. The drawing method according to claim 55, wherein the calculation amount is determined by the curved surface interpolation level and the number of control points.

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