JP3387561B2 - Triangle creation method in figure editing system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triangle creating method in a graphic editing system. In recent years, the importance of image information has increased with the development of multimedia computer systems, and there is a demand for a high-speed and easy graphic editing system.

Therefore, although the graphic editing system is provided with an excellent interface, the existing one is not sufficient, and a means for creating a more precise graphic is required.

[0003]

2. Description of the Related Art In a conventional graphic editing system, a triangle is created by designating coordinates with a mouse or the like. As supplementary information and means for designating coordinates, mouse position coordinate information, grid display, Cross cursors were used.

[0004]

In the conventional graphic editing system as well, since the means for creating a regular polygon such as a regular triangle is usually provided as standard equipment, the regular polygon is created as follows.
It can be done relatively easily. However, when creating triangles such as isosceles triangles and right triangles, since the only auxiliary information provided is coordinate information, only the relationship between the position and distance between the base and the vertex can be known, and there is no accurate information about the angle. However, there is a problem that it is difficult to accurately create an isosceles triangle or a right triangle.

Therefore, when creating a triangle to be used in arithmetic or geometry of a teaching material for which accuracy is required in consideration of education, the coordinates of three points are calculated in advance or created. After that, there was a problem that it was necessary to find the angle from the coordinates and correct the triangle once created.

As a result, there is a problem that it is extremely difficult to create an accurate triangle. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a triangle creating method in a graphic editing system that can create an accurate triangle and improve the performance of the graphic editing system. To do.

[0007]

FIG. 1 is a diagram showing the basic configuration of the present invention. As shown in FIG. 1, the present invention is a method of creating a triangle in a graphic editing system used to create and edit various graphics on a display screen. A coordinate calculation unit 3, a data holding unit 4, and a graphic drawing unit 5 are provided.

The input acquisition unit 1 uses input means such as a mouse and a keyboard to select various triangle shapes such as an equilateral triangle, an isosceles triangle, and a right triangle, and selection information including auxiliary information such as right angles and equiangular angles, and triangles. Input information consisting of position coordinate information at the time of creation is acquired.

The graphic creation unit 2 acquires the point information of the triangle to be created from the data holding unit 4 based on the input information acquired by the input acquisition unit 1. The coordinate calculation unit 3 calculates the coordinates of the base based on the input information acquired by the graphic creation unit 2 from the input acquisition unit 1 and the point information of the triangle acquired from the data holding unit 4 and the coordinates that can be taken from the shape of the triangle to be created. calculate.

The data holding unit 4 holds the point information of various triangles and the coordinates that can be taken from the shape of the triangle to be created calculated by the coordinate calculation unit 3. Figure drawing part 5
Tentatively draws on the display screen a line connecting the determined base of the triangle being created held by the data holding unit 4 and the apex that the triangle can take, and the input means of the input acquisition unit Draw the fixed triangle when the vertex is fixed. Further, on the display screen, the determined base of the triangle being created which is held by the data holding unit 4,
A line connecting the vertices that the triangle can take is tentatively drawn, and when the vertices are fixed by the input means of the input acquisition unit 1, auxiliary information such as right angle and equiangular is drawn at a predetermined position.

[0011]

FIG. 2 is a diagram showing how to define the vertices of a triangle. As shown in FIG. 2, if the type and the base of the triangle to be created are determined, the range in which the coordinates of the vertices can be taken is naturally determined. Therefore, if the type of the triangle to be created can be set in advance, an accurate triangle can be created.

The method of determining the vertices of various triangles will be described below with reference to FIG. (Equilateral triangle) The vertex is the intersection 2 of two sides with the same length as the base.
Limited to either one of the points.

The (isosceles triangle) vertex is limited to somewhere on a perpendicular line passing through the center of the base. The (right-angled triangle) apex is limited to somewhere on two perpendicular lines extending from both ends of the base or on a circumference having a diameter at the base.

(Right-angled isosceles triangle) It is limited to either of two intersection points of two sides intersecting at a right angle on a perpendicular line passing through the center of the base.

(Other triangles) By its nature, the vertices are
There is no particular limitation because it has nothing to do with the base. In the present invention, the method of defining the vertices of various triangles described above is realized as follows.

In the present invention, when the triangle creation command is selected, a shape selection window is displayed on the display screen, requesting the user to select the triangle type.
When the user selects a particular type of triangle using the mouse or keyboard, the system stores the selection result, that is, the type (shape) of the triangle to be created.

Next, when the user uses the mouse to specify the base of the triangle on the display screen, the coordinates that can be taken as the vertices of the triangle depending on the mouse coordinates monitored by the system and the type of the selected triangle. The guide is displayed within the range. As the guide, use thin lines, lines with different brightness and color from the bottom, or dotted lines.

Even if the guide is displayed, the coordinates of the mouse cursor are not bound on the guide, only the coordinates of the mouse cursor are subject to monitoring, and the system displays a line segment indicating an undetermined portion on the guide. .

When the user designates the end at an arbitrary point on the guide, the coordinates of the vertices are fixed and the creation of the triangle is completed. At this time, if auxiliary information such as right angle or equiangular is also selected in the shape selection window, auxiliary information such as right angle or equiangular is displayed at a predetermined position of the completed triangle, and creation of the triangle is confirmed. Then, it is taken into the figure data.

As described above, according to the present invention, various triangles having different shapes can be accurately and easily created. The data to be processed are paint (bitmap) data and draw (object) data.

[0021]

FIG. 3 is a diagram showing the hardware configuration of the present invention, and shows the configuration of the hardware necessary to realize the graphic editing system according to the present invention and their respective relationships.

In the figure, 11 is a computer system, and 12
Is a keyboard, 13 is a mouse, 14 is a computer monitor (display), 15 is a file, and 16 is a user.

The program on the computer system 11 receives the input information from the mouse 13 operated by the user (user) 16 and sets the coordinate range that can be taken as the vertices of the triangle calculated from the data in the memory or the file 15. A guide is displayed on the computer monitor (display) 14.

FIG. 4 is a diagram showing the data structure of the present invention. Each triangle data always has three point data, and each point data is composed of X / Y coordinate information. Each point is connected to the other two points by a straight line.

A specific example of triangle formation according to the present invention will be described below. (1) Display example on screen (1) (see FIG. 5) This example is for creating a right triangle, and the processing flow of triangle creation is shown on the left side of FIG. Is shown on the display screen.

(S1) With a keyboard or a mouse,
The "triangle" command is selected. (S2) The system displays a "shape selection window" on the display screen.

(S3) With a keyboard or a mouse,
The triangle to be created is selected. In this example, “right triangle” is selected. Then, "right angle" is selected as the auxiliary information.

(S4) The system erases the "shape selection window" displayed on the display screen. (S5) By clicking the left mouse button on the display screen, the starting point of the base of the triangle is specified.

(S6) After moving the mouse to the right, click the left button of the mouse to set the base of the triangle. (S7) The system, depending on the type of the triangle and the mouse position, until the end of the vertex is specified by clicking the mouse,
Display the guide on the display screen. In the figure, it is shown by two dotted lines.

(S8) When the left button of the mouse is clicked at an arbitrary point on the guide, the positions of the vertices are fixed and the triangle is completed. When "Right angle" is selected as the auxiliary information, the auxiliary information "Right angle" is displayed at a predetermined position,
It is captured in the completed right triangle.

Through the above steps, one of the two right triangles shown in the lower right of FIG. 5 is created. (2) Display example on screen (2) (see FIG. 6) This example is for creating an isosceles triangle, and the processing flow of triangle creation is shown on the left side of FIG. Shows the display on the display screen.

(S1) With a keyboard or a mouse,
The "triangle" command is selected. (S2) The system displays a "shape selection window" on the display screen.

(S3) With a keyboard or a mouse,
The triangle to be created is selected. In this example, “isosceles triangle” is selected. Then, “equal angle” is selected as the auxiliary information.

(S4) The system erases the "shape selection window" displayed on the display screen. (S5) By clicking the left mouse button on the display screen, the starting point of the base of the triangle is specified.

(S6) After moving the mouse to the right, click the left button of the mouse to set the base of the triangle. (S7) The system, depending on the type of the triangle and the mouse position, until the end of the vertex is specified by clicking the mouse,
Display the guide on the display screen. In the figure, it is shown by two dotted lines.

(S8) When the left mouse button is clicked at any point on the guide, the positions of the vertices are determined and the triangle is completed. When "isometric" is selected as the auxiliary information, the auxiliary information "isometric" is displayed at a predetermined position,
It is included in the completed isosceles triangle.

Through the above steps, one of the two isosceles triangles shown in the lower right of FIG. 6 is created.
Next, the processing flow of the present invention will be described. FIG. 7 is a diagram showing an event loop of the present invention.

(S1) It is determined whether or not the mouse button is pressed. If YES, then proceed to s2, NO
If so, the process proceeds to s7. (S2) It is determined whether or not the bottom of the triangle has been determined. If YES, the process proceeds to s3, and if NO, the process proceeds to s6.

(S3) The vertices are confirmed and the completed triangles are displayed. (S4) It is determined whether or not there is auxiliary information such as “right angle” or “equal angle”. If YES, the process proceeds to s5, and if NO, the creation of the triangle ends.

(S5) Auxiliary information such as "right angle" or "equal angle" is displayed at a predetermined position of the triangle displayed after the creation is completed. (S6) Move the mouse on the display screen and click the mouse button to create the base of the triangle. When the system finishes creating the base of the triangle,
Display it with a bold line.

(S7) It is determined whether or not the mouse is moving. If YES, the process proceeds to s8, and if NO, s
Return to processing of 1. (S8) It is determined whether or not the bottom of the triangle has been determined. If YES, the process proceeds to s9, and if NO, s11.
Go to processing.

(S9) The coordinates of the vertices are calculated from the coordinates of the mouse and the shape of the selected triangle. (S10) The guide is displayed from the bottom to the coordinate range of the apex calculated by the process of s8.

(S11) A guide on the bottom of the triangle to be created is displayed. Through the above steps, the triangle creation process ends. Next, the processing flow of vertex calculation will be described with reference to FIG.

(S1) The selected triangle is an "equal triangle"
Or not. If YES, the process proceeds to s2, and if NO, the process proceeds to s4. (S2) Two intersections of a circle centered on each end point of the base and having a radius at the base are obtained.

(S3) The point having the shorter distance between the two intersections obtained in the processing of s2 and the mouse coordinates is validated and is used as the vertex coordinate candidate. (S4) It is determined whether the selected triangle is an “isosceles triangle”. If YES, then proceed to s5, NO
If so, the process proceeds to s6.

(S5) An intersection between a perpendicular line passing through the midpoint of the bottom and mouse coordinates is obtained. This intersection is a candidate for the coordinates of the vertex. (S6) It is determined whether the selected triangle is a "right triangle". If YES, the process proceeds to s7, and if NO, the process proceeds to s10.

(S7) Two intersections of a perpendicular line passing through the end points of the bottom and mouse coordinates are obtained. (S8) An intersection between a circumference having a diameter at the bottom and a straight line extending from the midpoint of the bottom to the mouse coordinates is obtained.

(S9) The point having the shortest distance between the mouse coordinates and the three intersections, which are the two intersections obtained in the processing of s7 and the one intersection obtained in the processing of s8, is validated as the vertex coordinate candidates.

(S10) It is judged whether or not the selected triangle is a "right isosceles triangle". If YES, s1
The process proceeds to step 1, and if NO, the calculation of the vertex is ended. (S11) Two intersections of a perpendicular line passing through the midpoint of the base and a circumference having a diameter at the base are obtained.

(S12) The point having the shorter distance between the two intersections obtained in the processing of s11 and the mouse coordinates is validated and the vertex coordinates are selected. Through the above steps, the calculation of the vertices of an equilateral triangle, an isosceles triangle, a right triangle, and an isosceles right triangle is completed.

[0051]

According to the present invention, in the graphic editing system, if a shape type such as an equilateral triangle, an isosceles triangle, a right triangle, and an isosceles right triangle is selected and a base is designated, the display screen is displayed. A guide that shows the coordinate range that can be a candidate for a vertex is displayed on the top, so the user can easily create various triangles with an accurate shape simply by moving the mouse over the guide and specifying the vertex. It will be possible.

Further, in the present invention, since the triangle is created from the designation of the base, when the base is not horizontal or vertical but an inclined triangle is created, or one side is overlapped with another figure. Even in cases such as this, it is possible to easily create a triangle with an accurate shape.

Therefore, according to the present invention, it is possible to accurately and promptly create various triangles used in arithmetic and geometry of teaching materials for learning, which are required to be accurate in consideration of education. Become.

As described above, the present invention largely contributes to the performance improvement of the graphic editing system.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram showing how to define the vertices of a triangle.

FIG. 3 is a diagram showing a hardware configuration of the present invention.

FIG. 4 is a diagram showing a data structure of the present invention.

FIG. 5 is a diagram showing a display example (No. 1) on the screen.

FIG. 6 is a diagram showing a display example (No. 2) on the screen.

FIG. 7 is a diagram showing an event loop of the present invention.

FIG. 8 is a diagram showing a processing flow of vertex calculation.

[Explanation of symbols]

1 Input acquisition section 2 figure creation department 3 Coordinate calculation unit 4 Data storage 5 Graphic drawing section

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Nakamura 1-6-4 Osaki, Shinagawa-ku, Tokyo Within Fujitsu Social Science Laboratory (72) Inventor Yuzo Maeda 1-6-6 Osaki, Shinagawa-ku, Tokyo No. 4 in Fujitsu Social Science Laboratory (56) References JP-A-63-24460 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06T 11/80 G06F 3 / 00 G09G 5/36 G06F 17/50

Claims (2)

(57) [Claims] 1. A method of creating a triangle in a graphic editing system used to create and edit various graphics on a display screen, comprising: an input acquisition unit, a graphic creation unit, a coordinate calculation unit, a data holding unit, And a figure drawing section, and the input acquisition section uses input information such as a mouse or keyboard to select various triangle shapes such as equilateral triangles, isosceles triangles, and right triangles, and auxiliary information such as right angles and equiangular angles. , And the input information consisting of the position coordinate information at the time of creating the triangle, the figure creating unit acquires the point information of the triangle to be created from the data holding unit based on the input information acquired by the input acquiring unit, The coordinate calculation unit should create the coordinates of the base based on the input information acquired by the figure generation unit from the input acquisition unit and the point information of the triangle acquired from the data storage unit. The coordinates that can be taken from the shape of the triangle to be calculated are calculated, and the data holding unit holds the point information of various triangles and the coordinates that can be taken from the shape of the triangle to be created calculated by the coordinate calculation unit. Tentatively draws on the display screen a line connecting the determined base of the triangle being created which is held by the data holding unit and the vertex that the triangle can take, and the vertex is input by the input unit of the input acquisition unit. A method for creating a triangle in a graphic editing system, which is characterized in that a triangle which is determined when is determined is drawn. 2. The graphic drawing unit according to claim 1, wherein the graphic drawing unit tentatively draws a line connecting a fixed base of the triangle being created which is held by the data holding unit and a vertex which the triangle can take on the display screen. A method of creating triangles in a graphic editing system, which is characterized in that auxiliary information such as right angle and equiangular is drawn at a predetermined position when a vertex is determined by the input means of the input acquisition unit.