JPH0727363B2 - Drawing data processing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drawing data storage method, an erasing method, and a line type changing method.

(Prior Art) Conventionally, with respect to a drawing displayed on a drawing display screen, a method of erasing the drawing by enclosing the portion to be erased and filling the inside with the color of the background screen has been widely used. .

FIG. 9 shows an example of a superimposed graphic on a conventional drawing display screen.

When you want to delete the coordinate data not only from the display screen but also from the memory, or when multiple figures are superimposed,
When it is desired to erase one figure (for example, when only the cross is to be erased in FIG. 9), it is difficult to give instructions in stroke units, which is difficult to realize. In addition, the method of changing the line type has not been performed yet.

(Object of the Invention) In order to solve the above problems, the present invention accumulates drawing in a memory in stroke units in input time series, and when a drawing is erased, a stroke (or pattern) to be erased is pen-touched. This allows the stroke (pattern) to be displayed not only on the drawing display screen but also in the memory.
Detected, and its stroke (pattern) from the memory
Is deleted, and the line type of the stroke (pattern) detected by the pen touch is changed when the line type is changed.

A detailed description will be given below with reference to FIGS. 1 to 6.

(Structure of the Invention) FIG. 1 is a diagram showing a data structure of drawing data in the present invention, 11 is a command indicating a pen down, 12 is a command indicating a pen up, 13 is time information indicating a time interval between strokes, 21 to 2n are coordinate data at times 1 to n.

The present invention stores drawing data with a data structure as shown in FIG. That is, continuous coordinate data from pen down to pen up is accumulated as one stroke.

Furthermore, by adding the time interval between strokes as time information and outputting the drawing while referring to the time information, it is possible to output in the same time series as at the time of input.

FIG. 2 is a functional block diagram of a drawing data storage system according to the present invention, in which 31 is a drawing data input device, 32 is an encoder, 33 is a stroke detection circuit, 34 is a time information adding circuit,
35 is a buffer memory, 36 is a decoder, 37 is a drawing display device,
38 is a timer and 39 is a file memory.

At the time of input, first, with respect to the drawing data input by the drawing data input device 31, strokes are detected by the pen-up / pen-down determination circuit included in the circuit of the stroke detection circuit 33, and then the time interval between strokes is detected by the timer 38. Is measured and this time interval is added as time information by the time information adding circuit 34.

At the time of output, when the data taken out by the file memory 39 is decoded by the decoder 36, the time information added to the data is referred to thereby output in the same time series as at the time of input.

With respect to the drawings accumulated by the above accumulation method, the mode for erasing the drawing is the erasing mode and the mode for changing the line type is the line type changing mode.

In the erase mode, a stroke including a point closest to the point touched by the pen among the points displayed on the screen is detected from the memory, and the stroke is erased not only from the display screen but also from the memory. This erasing method is called a stroke erasing method.

FIG. 3 is a diagram showing an outline of the stroke erasing method.

In FIG. 3, 41 is a drawing display screen, 42 is a data structure of drawing data, 43 is a point touched by a pen, 44 is a display point in the vicinity of the point 43, 45 is a stroke including the point 44, and 46 is on a memory. Represents the coordinate data corresponding to the point 44 of.

FIG. 4 is a functional block diagram of the stroke erasing method.

First, the pen touch point detection circuit 51 detects a point where a pen touch is made, and among the points displayed on the screen, the closest point to this point is detected by the nearest point detection circuit 52.

Next, the stroke including the point detected by the closest point detection circuit 52 is detected by the stroke detection circuit 53, and the stroke erase circuit 54 erases the stroke from the screen and the memory.

FIG. 5 is a diagram showing an outline of the pattern erasing method.
FIG. 5A shows drawing on the screen, and FIG. 5B shows drawing data on the memory.

This pattern erasing method is, for example, a method for erasing a drawing, which is preferable to be recognized as one pattern and erased in a lump, rather than erasing in a stroke unit such as a dotted line.

In the erasing mode, first, the stroke S ₀ including the point closest to the point touched with the pen among the points displayed on the screen is detected.

Next, the moving distance d ₁ from the pen-up to the pen-down (that is, the time when the pen touch is not performed) when accumulating the stroke S ₁ following S ₀ in time series (the last point of the stroke S ₀ and the stroke S ₁ The distance from the first point of).

If d ₁ does not exceed a certain threshold d, then stroke S ₁ is in the same pattern as S ₀ . In addition, the stroke
The same operation is performed for S ₁ and S ₂ .

The same process is performed for the pen-up time t.
That is, the time difference from pen-up to pen-down at the time of accumulation with the stroke S ₁ following S ₀ in time series is measured, and if the time difference does not exceed a certain threshold value, the stroke S _{1 is set} to S ₀ . It is assumed that they are in the same pattern, and the same operation is performed for the strokes S ₁ and S ₂ .

This operation is repeated until the moving distance d _n exceeds the set threshold value d, and if it exceeds the threshold value at d _n , it is assumed that the strokes up to S _n-1 are in the same pattern as S ₀ .

The same operation is performed for the strokes S _-1 , S _-2, ... which are traced back in time series from S ₀ .

In this way, which stroke to which stroke the pattern including the stroke S ₀ is included is detected, and the entire pattern is collectively erased from the display screen and the memory.

In FIG. 5 (a), erasing S _-1, the S _0, S ₁ as one pattern.

FIG. 6 is a functional block diagram of the pattern erasing method.

Among the points displayed on the screen, the point closest to the point detected by the pen touch point detection circuit 71 is detected by the nearest point detection circuit 72, and the stroke including the point detected by the nearest point detection circuit 72 is stroked. Detection circuit
Detect at 73.

By measuring the distance between the stroke and the stroke that is temporally close to it, it is determined which stroke may be erased as one pattern by measuring the distance between strokes circuit in the pattern detection circuit 74. Finally,
The pattern erasing circuit 75 erases one pattern at a time.

When the drawing data is erased from the screen and the memory, it is naturally possible to display the portion to be erased on the screen by blinking or changing the color.

In the line type change mode, the stroke line type change method is
The processing up to the stroke detection is performed in the same manner as the stroke erasing method, and is a method in which the type of stroke line (solid line, dotted line, alternate long and short dash line, etc.) designated by pen touch, color, and size are changed.

FIG. 7 is a functional block diagram of the stroke line type changing system.

First, the pen touch point detection circuit 81 detects the position coordinates of the point designated by the pen touch.

Next, of the points displayed on the screen, the closest point to the detected point is detected by the closest point detection circuit 82, and the stroke including the point detected by the closest point detection circuit 82 is detected by the stroke detection circuit 83. To detect. The line type of the stroke is changed by the line type changing circuit 84 on the display screen and the memory.

The pattern line type changing method is a method of changing the line type of the pattern designated by the pen touch by performing the processing up to the pattern detection in the same manner as the pattern erasing method.

FIG. 8 is a functional block diagram of the pattern line type changing system.

First, the pen touch point detection circuit 91 detects the position coordinates of the point designated by the pen touch.

Next, of the points displayed on the screen, the closest point to the point that has been detected is detected by the closest point detection circuit 92.

Then, the stroke detection circuit 93 detects a stroke including the point detected by the nearest point detection circuit 92.

Further, the pattern detection circuit 94 detects the pattern including the stroke detected by the stroke detection circuit 93, and finally, the line type of the pattern is changed by the line type changing circuit 95 on the display screen and the memory.

(Effects of the Invention) As described above, according to the present invention, when erasing drawing data, it can be erased not only from the drawing display screen but also from the memory, and in the erasing mode, in the vicinity of the stroke to be erased. It is possible to erase only a desired stroke by touching with a pen. That is, when a plurality of figures are superimposed, only the figure to be deleted can be deleted.

Further, by using the pattern erasing method, it becomes possible to erase the dotted lines or characters collectively.

Furthermore, it is possible to change the type of line, the thickness of the line, and the color of the line for each stroke or for each pattern.

[Brief description of drawings]

FIG. 1 is a diagram showing a data structure of drawing data in the present invention, FIG. 2 is a functional block diagram of a drawing data storage system in the present invention, FIG. 3 is a diagram showing an outline of a stroke erasing system, and FIG. 4 is a stroke. 5 is a functional block diagram of the erasing method, FIG. 5 is a diagram showing an outline of the pattern erasing method, FIG. 5 (a) shows drawing on the screen, FIG. 5 (b) shows drawing data on the memory, and FIG. 6 is a functional block diagram of the pattern erasing method, FIG. 7 is a functional block diagram of the stroke line type changing method, and FIG. 8 is a functional block diagram of the pattern line type changing method.
FIG. 9 shows an example of a superimposed graphic on a conventional drawing display screen. 11 ... Command indicating pen down, 12 ... Command indicating pen up, 13 ... Time information indicating time interval between strokes, 21 to 2n ... Coordinate data at time 1 to n, 31
...... Drawing data input device, 32 …… Encoder, 33,53,73,83,
93: Stroke detection circuit, 34: Time information addition circuit,
35 …… buffer memory, 36 …… decoder, 37 …… drawing display device, 38 …… timer, 39 …… file memory, 41 …… drawing display screen, 42 …… drawing data data structure, 43 …… pen touch Point, 44 ... the closest point of the pen touch point 43, 45 ... the stroke including the point 44, 46 ... coordinate data corresponding to the point 44 on the memory, 51, 71, 81, 91 ... pen touch point detection circuit, 52 , 72,82,92 …… Nearest point detection circuit, 54 …… Stroke erase circuit, 74,94 …… Pattern detection circuit, 75 …… Pattern erase circuit, 84,95 …… Line type change circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Sakai 1-2356 Take, Yokosuka City, Kanagawa Nippon Telegraph and Telephone Corporation, Yokosuka Electro-Communications Laboratory (56) Reference JP-A-56-92588 (JP, A)

Claims (1)

[Claims] 1. A drawing data accumulating means for accumulating drawing data on a memory, a drawing displaying means for drawing and outputting the accumulated drawing data, and a point for detecting a designated point of the drawn and displayed drawing data. In the drawing data processing method, which includes a detection unit, a drawing pattern recognition unit that detects a stroke of the designated point and recognizes the stroke as a drawing pattern, and an image processing unit that performs image processing of the recognized drawing pattern, the drawing data storage unit Has a means for accumulating the drawing data on a memory by adding a time interval between the stroke units, and the drawing pattern recognition means,
A stroke including the closest point of the designated point is detected, and a stroke string in the drawing data whose distance interval and time interval are less than or equal to a predetermined threshold is recognized as one drawing pattern. A drawing data processing method having means.