JPS63263518A - Graphic input device - Google Patents

Abstract

PURPOSE:To input a graphic approximating human work with less labor by providing a means, which detects the drawing speed in accordance with coordinate inputs to set the line width in inverse proportion to this detected drawing speed, to easily change the line width even in one stroke. CONSTITUTION:A device consists of a coordinate designating means 4 which designates coordinates and a means which detects the set speed of the designating means 4 to set the width of coordinates or segments connecting coordinates in inverse proportion to the speed. Thus, fine lines are drawn in case of high drawing speed and thick lines are drawn in case of low drawing speed. Since a dot is gradually enlarged by long staying of a writing brush at one point and a line is narrowed by a low drawing speed in case of write on a common Japanese writing paper with the writing brush, the graphic is inputted as if it were drawn on the common Japanese writing paper with the writing brush, and this graphic approximates a human work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a graphic input device, and particularly to a graphic input device suitable for inputting graphics such as characters whose line widths vary.

[Prior Art] Conventional graphic input methods include a method in which line widths are selected and determined in advance, and drawing is performed based on the input coordinates, or conversely, coordinate values are input first, and then drawn. This is a method in which the line width is determined and drawn later, and the width is determined for each line segment (stroke).

One of these conventional examples is JP-A-60-254313.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology has the problem that when you want to change the line width within one stroke, there is no easy way to do it, and it is necessary to change the line width by making corrections or additional writing afterwards, which is time-consuming. . Especially when inputting characters 1. If you try to write in a calligraphy style, you can only draw a line of the same width by simply writing the characters, so it will not work, so you can input the phosphor strokes of the characters in the same way as shapes. I had no choice but to use methods such as coloring it over, which took a lot of time and effort.

An object of the present invention is to make it possible to easily change the line width even within one stroke, and to input figures close to human spacing with less effort.

Means for Solving Problem c] The present invention is provided with means for detecting the drawing speed from the seat input and setting the line width in inverse proportion to the detected drawing speed.

[Effect]

With the above means, areas where the drawing speed is fast can be drawn thinly, and areas where the drawing speed is slow can be drawn thickly.

This is similar to when writing on paper with a brush, and if you keep the brush at one point for a long time, the dot gets bigger little by little, and if you draw a line quickly, it gets thinner, and it can be said that it is close to the human sense.

〔Example〕

FIG. 2 shows a configuration diagram of the coordinate input device of the present invention.

The coordinate input device is the central processing unit 1. Memory 21 Display device 3. It consists of a coordinate input device 4.

The memory 2 stores the processing program of this embodiment and data such as coordinate values, and the central processing unit 1 uses this data to execute the processing program. The coordinate input device 4 inputs coordinate values at regular intervals when coordinates can be input (when the pen is down or when the cursor is in a specified range) and centrally processes the coordinate values. The processing program of the present invention reads the coordinate values with respect to the memory, calculates the line width, and based on this, transfers the data to the memory 2 using an interrupt from the device 1.
3. Perform drawing.

Here, the relationship between an example of coordinate input by the coordinate input device 4 and drawing speed will be described. When inputting adjacent coordinates a and b,
Assuming that it takes time t from inputting coordinate a to inputting coordinate S, the drawing speed V between coordinates B and *l) at this time is.

b-a ・・・・・・・・・(1) Since it is assumed that the total coordinate input device 1 imports coordinates at a constant period, t is a constant value, and the drawing speed V is (b -a)
It is determined by In other words, in a coordinate input device 1 in which adjacent coordinates are input one after another at a constant period, the difference between adjacent coordinates can be regarded as the drawing speed (more precisely, proportional).
If line segment length is input, difference calculation is not necessary. This speed calculation is executed by the central processing unit 1.

On the other hand, there are examples of coordinate input devices that import coordinates not at regular intervals but irregularly, and only when instructed. In this case, since t in equation (1) changes each time the coordinates are captured, (1
) calculation requires that each time the coordinates are taken in, a process is performed to obtain the difference (a-b) between the differential time t and the positions 4g1a and b, and a division process is performed using the formula (1).

The line width is determined by multiplying the reciprocal of the speed thus obtained by a coefficient and clipping at the maximum and minimum line width values. Therefore, by calculating and displaying this line width for all input coordinate values.

It is possible to draw figures with a line width that corresponds to the speed.

Specific examples of the coordinate input device l include a tablet and a mouse. A tablet is a device that when a person moves a pen on the tablet, the trajectory of the pen moves at a fixed period (20 msec to 10 msec).
m5ec). The indicated point is sent as is to the central processing unit 1. This tablet does not necessarily require CRT display.

The mouse draws a trajectory on the CRT, and the central processing unit 1 periodically accesses and captures the trajectory of the mouse movement.

Even with these mice and tablets, there are examples in which each instruction is imported into the central processing unit 1.

Next, an outline of the processing of this embodiment is shown in FIG.

The process of changing the line width is independent for each stroke. In other words, the initial line width of each stroke is 1 (minimum value), so
Initialize parameters such as line width for each stroke (step 10) Zero-order coordinate input device! ! Memory 2 from 4
Read the coordinate values transferred to (step 11), calculate the drawing speed between the input coordinates based on these coordinate values, and determine the line width (step 12). Draw (step 13). When drawing, there are two cases: drawing as a point and drawing as a straight line. In the case of a point, the line width corresponds to the size of the point (radius), and in the case of a straight line, the line width is the same as the line width. represent.

Details of line width calculation are shown in FIG. 3.As explained earlier, in this embodiment, the coordinate values are sampled at a constant period, so the drawing speed between the coordinate values is as follows.

Corresponds to the distance between coordinate values. Therefore, after reading the coordinate values from memory 2 (step 11), store them for use in the next calculation (step 14), calculate the difference between the previous coordinate value and the current coordinate value, and calculate the difference between the previous coordinate value and the current coordinate value. Find the distance difference from the previous point by calculating the distance (Step 1
5) Let this distance difference be the speed.

The processing when this speed is O, that is, when the same point is not moved, will be explained later. The reciprocal of the speed is multiplied by a constant coefficient K to adjust the correspondence between speed and width, and this value is further multiplied by the previous line width to obtain the line width (step 17). At this time, since the line width has a maximum value and a minimum value, clipping is performed using these values so that the line width falls within the range. By multiplying the previous line width, the line width will change smoothly to some extent even if there is a sudden change in speed. With the line width calculated in this way, a point with a size in the input coordinates or
By drawing a straight line with a width (step 13), a figure with variable line width can be drawn.

When drawing, you specify the width and coordinates, so if you memorize this data, you can convert the original data string of coordinate values only (but also includes a time component) to coordinate values with width. Therefore, graphic input with variable line width is achieved.

Furthermore, since the line width can be determined by calculation from the original coordinate values, a figure with a line width can be reproduced and drawn even if the original coordinate values are simply stored.

Next, when the velocity is O, that is, when the object does not move at the same point, it is not possible to calculate a value greater than 1 because the reciprocal of the velocity cannot be taken. Therefore, in this case, the time spent at the same point should be counted in step 18.
), the line width is calculated by multiplying this time by a coefficient and then by multiplying it by the immediately preceding line width (step 19) 6 In this embodiment, the input coordinate string is sampled at equal time, so the number of inputs at the same point is equal to the time. It represents. In this way, even when they are at the same point, the line width is determined and drawing is performed using this width (Step 13) One or more processing steps 11 to 19
By repeating , you can easily input figures with variable line widths within one stroke. Note that stroke boundaries can be input as data separate from the coordinate values using the coordinate input device 4, so by using this, coordinate values in the memory 2 can be compiled separately for each stroke, and the coordinate values of one stroke can be input. Once everything is processed, the first or third
Get out of the loop.

In this example, the line width for each stroke is independent, and the line width is set to 1 at the beginning of each stroke, but this is because the previous line width is memorized and this value is used at the beginning of the first stroke. It is also possible, and depending on the application, this may be preferable.

Next, an actual example will be explained with reference to FIG.

The coordinate values input into the memory 2 from the coordinate input device 4 are stored as in coordinate input example 20. First, the coordinates are determined by the first Pl and the line width is 111 #t.Since the 0th order point is the same point Pt, we know that we are at the same point for 1 unit time, and the 1st order Pt whose line width is P2'' is the same point. In the same way, the line width is “3”
And then the next P.

The distance between 1st order p2-p, where the line width becomes ``4'' is 1, so the coefficient becomes the maximum value, and the line width remains unchanged at 4. Distance between 0th order p3-p, = 2 So the line width is 3"
Since the distance becomes larger as P4+P5, the line width becomes thinner, and in the end, a figure like drawing example 21 is drawn and this can be input.

〔Effect of the invention〕

According to the present invention, simply inputting coordinate values can be converted to input with line width, so it is possible to change the line width within one stroke without an additional device, reducing the trouble of inputting figures such as one character. This has the effect of further increasing expressiveness.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an overview of processing in an embodiment of the present invention, and FIG.
The figure shows the hardware configuration of one embodiment, FIG. 3 is a diagram explaining the processing contents of one embodiment in detail, and FIG. 4 shows the following:
It is a figure showing an example of a processing result by one example. 1...Central processing unit, 2...Memory, 3...Display device. 4...Coordinate input device. Representative Patent Attorney Tadashi Akimoto Figure 1 + Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A figure consisting of coordinate indicating means for indicating coordinates, and means for detecting the coordinate speed by this indicating means and setting the coordinates or the width of a line segment connecting the coordinates in inverse proportion to the speed. input device. 2. The graphic input device according to claim 1, wherein the instruction means is a mouse. 3. The graphic input device according to claim 1, wherein the instruction means is a tablet.