JPH07104769B2 - Graphic display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic data processing device for generating graphic data by processing graphic data.

[0002]

2. Description of the Related Art An electronic computer such as a personal computer executes a graphic display by drawing a straight line between arbitrary two points on a screen of a CRT display device or drawing a circle having a designated diameter by its arithmetic processing. It is possible. Thus, the dot configuration of the conventional CRT display device for performing graphic display is normally 640 horizontal × 200 vertical, and the ratio of the horizontal to vertical of the CRT screen is 4: 3. Therefore, when a display area of such a CRT screen is directly applied to the xy coordinates and a drawing program is created and executed assuming that there are 640 scales in the x-axis direction or 200 scales in the y-axis direction, it is visually unrealistic. There is a problem with graphics being displayed. The reason for this is that the horizontal to vertical ratio of the CRT screen is standardized to 4: 3, but it has already been stated 6
This is because it was applied to the 40 × 200 dot configuration, that is, in other words, the number of dots per unit length is: horizontal direction 640 ÷ 4 = 160 vertical direction 200 ÷ 3 = 66.7, that is, the horizontal direction is This is because the length obtained by drawing a straight line of 160 dots is 67 dots in the vertical direction. In the conventional case, the ratio of 4: 3 was directly applied, and the number of dots in the vertical direction had to be 640 × 4/3 = 480, but 2.4 as 200 dots.
Double the vertical direction.

[0003]

[Problems to be Solved by the Invention] Such a conventional CR
Due to the problem of the T display device, there is a practical problem that the inclination of the straight line cannot be visually drawn correctly, and similarly the circle cannot be drawn correctly and is distorted.
Therefore, conventionally, in the case of the CIRCLE command for drawing a circle, the correction is performed on the program so that the perfect circle is visually displayed graphically. However, no corrections were made except for the drawing of circles, leaving practical inconvenience. In addition, the set of dots such as straight lines or circles that are graphically displayed in this way is usually fixed to the shape at the time of drawing a graphic, and if you want to change the drawn graphic to, for example, a vertically long graphic display. However, there was a problem that the change could not be done easily. The fact that such a display change cannot be easily carried out is the same when it is desired to change the display form of the entire display data displayed on the display screen (for example, when it is desired to enlarge in the vertical direction). An object of the present invention is to make it possible to draw and display a graphic figure corresponding to an arbitrarily designated dot screen configuration among dot screen configurations having different dot configurations.

[0004]

Means for Solving the Problems The means of the first invention is as follows. In a graphic display device that draws and displays a graphic figure such as a circle or a straight line based on graphic processing, a designating unit designates an arbitrary screen configuration among a plurality of types of screen configurations having different display configurations on a display screen. . The selecting means selects the screen configuration-specific parameter information corresponding to the screen configuration designated by the designating means from among the plurality of screen configuration-specific parameter information corresponding to the respective screen configurations. When the graphic means draws the graphic figure on the display screen based on the graphic process, the drawing coordinate position on the graphic figure is taken into consideration in consideration of the screen configuration-specific parameter information selected by the selecting means. Are sequentially calculated. The graphic drawing and displaying means draws and displays the graphic figure on the display screen by drawing and displaying at each drawing coordinate position calculated by the calculating means. The means of the second invention is as follows. In a graphic display device for drawing and displaying a graphic figure such as a circle or a straight line based on a graphic process, the designating means is an arbitrary dot screen configuration among a plurality of types of dot screen configurations having different display dot configurations on the display screen. Is specified. The selecting means selects a parameter corresponding to the dot screen configuration designated by the designating means from a plurality of screen configuration-specific data corresponding to the respective dot screen configurations. The calculating means calculates the coordinate information of each dot display coordinate position on the graphic figure based on the graphic processing by adding the parameter selected by the selecting means. The graphic drawing display means draws and displays the graphic figure on the display screen by displaying the dot display coordinate position based on each coordinate information calculated by the calculating means. When the first dot screen configuration is designated by the designating means, based on the coordinate information of each dot calculated based on the first parameter automatically selected corresponding to the dot screen configuration. When a first graphic figure is drawn by the user and a second dot screen configuration different from the first dot screen configuration is designated by the designating means, the second dot screen configuration is automatically selected in correspondence with this dot screen configuration. The second graphic figure is drawn based on the coordinate information of each dot calculated based on the second parameter.

[0005]

The operation of the means of the first invention is as follows. In a graphic display device that draws and displays graphic figures such as circles and straight lines based on graphic processing, an arbitrary screen configuration among a plurality of types of screen configurations having different display configurations on a display screen is designated by a designating means,
Further, among the plurality of screen configuration-specific parameter information corresponding to each of the screen configurations, the screen configuration-specific parameter information corresponding to the screen configuration designated by the designating unit is selected by the selecting unit. Then, when drawing the graphic figure on the display screen based on the graphic process, each drawing coordinate position on the graphic figure is calculated in consideration of the screen configuration-specific parameter information selected by the selecting means. The graphic figures are sequentially calculated by the means, and the graphic drawing display means draws and displays at each of the calculated drawing coordinate positions to draw and display the graphic figures on the display screen. Therefore, according to the first aspect, the parameter information for each screen configuration corresponding to the specified screen configuration is selected from the plurality of parameter information for each screen configuration corresponding to each of the screen configurations having different display configurations, and this selection is performed. It is possible to calculate each drawing coordinate position on the graphic figure by adding the generated screen configuration-specific parameter information and to draw and display the graphic figure at each calculated drawing coordinate position. The operation of the means of the second invention is as follows. In a graphic display device that draws and displays graphic figures such as circles and straight lines based on graphic processing, an arbitrary dot screen configuration among a plurality of types of dot screen configurations having different display dot configurations on the display screen is designated by a designating means. The parameter corresponding to the dot screen configuration designated by the designating unit is selected by the selecting unit from the plurality of screen configuration-specific data designated and corresponding to each of the dot screen configurations. Then, the coordinate information of each dot display coordinate position on the graphic figure based on the graphic processing is calculated by the calculating means by adding the parameter selected by the selecting means, and based on the calculated coordinate information. By displaying the dot display coordinate position by the graphic drawing display means, the graphic figure is drawn and displayed on the display screen. When the first dot screen configuration is designated by the designating means, based on the coordinate information of each dot calculated based on the first parameter automatically selected corresponding to the dot screen configuration. When a first graphic figure is drawn by the user and a second dot screen configuration different from the first dot screen configuration is designated by the designating means, the second dot screen configuration is automatically selected in correspondence with this dot screen configuration. The second graphic figure is drawn based on the coordinate information of each dot calculated based on the second parameter. Further, according to the second invention, of the parameters corresponding to the dot screen configurations having different display dot configurations, the parameter corresponding to the designated dot screen configuration is selected, and the selected parameter is added. The coordinate information of each dot display coordinate position on the graphic figure can be calculated, and the graphic figure can be drawn and displayed based on the calculated coordinate information.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit configuration diagram of a main part. In the figure, a CPU (central processing unit) 1 is a circuit for controlling all the operations of this computer system, and during the drawing of a straight line or a circle by a graphic command, coordinate data X of display data obtained by arithmetic processing, Y is output. Thus, the coordinate data X is directly input to the VIDEO RAM (random access memory) 2, while the coordinate data Y is input to the latch 3 and latched. The registers 4 ₁ , 4 ₂ , 4 ₃ , and 4 ₄ respectively store the visual correction values of Nos. 1, ₂ , ₃ , and 4 shown in Table 1, and the register 4 ₃ stores the visual correction values 1.
0, that is, data when no visual correction is performed is stored. The vision correction values of the respective registers ₄₁ to ₅ are both applied to the selector 5. This selector

[Table 1] The correction value selection signal SL output from the CPU 1 and the multiplication instruction ML are applied to the data 5. The multiplication instruction ML is also applied to the latch 3. Thus to register selector 5 the corresponding correction value corresponding to the contents of the correction value selection signal SL 4 ₁ to 4 ₅
Is read out and applied to the input terminal B of the multiplier 6. On the other hand, the coordinate data Y latched in the latch 3 is applied to the input terminal A of the multiplier 6, and therefore the multiplier 6 multiplies the coordinate data Y by the selected visual correction value and the resultant data, that is, The corrected coordinate data Y ′ is output and applied to the VIDEO RAM 2. This VIDEO
As is well known, the RAM 2 is a memory that stores data in a one-to-one correspondence with a display screen of a CRT display device (not shown).

The visual correction values shown in Table 1 will be described with reference to FIG. The display screen of the CRT display device has a standardized aspect ratio of 3: 4. Further, this CRT display device has four types of dot configurations (screen configurations) as horizontal x dots and vertical y dots as shown in Table 1. For example, key input operation from a key input device (not shown) It is possible to select any one of the screen configurations according to the. And the visual correction value R is

[Formula 1] Since it is represented by the above formula (1), the dot configurations x × y shown in Table 1 are 320 × 200 and 640, respectively.
No. 1 of x200, 320x400, 640x400,
The visual correction value R in each case of 2, 3, and 4, respectively,

[Outer 1] Becomes Next, the operation of the above embodiment will be described. Now, assume that a straight line of y = x (2) is drawn on the CRT screen.

First, a graphic command is input by a key input operation to set a graphic display mode. Next, if visual correction is not to be performed now, a statement that does not indicate the visual correction execution mode is keyed in to cancel the visual correction mode. Next, a program for drawing the straight line of the formula (2) is input. Thus, in this case, C
PU1 outputs a correction value selection signal SL for reading the visual correction value 1.0 from the register 4 ₅ . Therefore, since the visual correction value 1.0 is applied to the input terminal B of the multiplier 6, the resulting coordinate data Y ′ is the same as the coordinate data Y. That is, the coordinate data X and Y are supplied to the VIDEO RAM 2, respectively. Therefore, as shown in FIG. 3, the straight line of the equation (2) which is not visually corrected is displayed on the screen of the CRT display device, but the inclination of this straight line is visually 2.4, that is, y = 2. 4x ... (3) It looks like a straight line is drawn.

Next, the case of performing visual correction will be described.
In this case, the visual correction execution mode is set in advance by inputting a statement having a predetermined content by key operation. As a result, visual correction is performed for all subsequent drawing and the drawing is executed. Next, for example, the screen configuration of 640 × 200 shown in No. 2 of Table 1 is specified by, for example, a key input operation. Therefore CPU1 outputs a correction value selection signal SL reads vision correction value 0.41667 from the register 4 _2, is applied to the selector 5. Next, a program for drawing the straight line of the above formula (2) is input, and execution of arithmetic processing is started. Therefore, the CPU 1 outputs the coordinate data X and Y having mathematically accurate values by executing the calculation, and the coordinate data X is VIDEO RA.
The coordinate data Y is directly applied to M2, and the coordinate data Y is applied to the latch 3. Further, the multiplication instruction ML output from the CPU 1 is applied to both the latch 3 and the selector 5. Therefore, the coordinate data Y and the visual correction value 0.41667 are applied to the input terminals A and B of the multiplier 6, respectively, which are multiplied and the resulting data is output as corrected coordinate data Y ′,
It is applied to the VIDEO RAM2. Therefore VID
Coordinates forming a pair of coordinate data X and Y ′ are sequentially set in the EO RAM 2, and then the screen is displayed on the screen of the CRT display device.
The straight line of the formula (2) having the inclination of 45 degrees is visually corrected as shown in FIG. That is, the inclination of the straight line of the equation (2) based on the mathematically accurate coordinate data X and Y is halved or quadrupled to be displayed, and the position of the vertical coordinate is reduced.

In the above-mentioned operation example, the case of No2 in Table 1 has been described, but the operations in the case of visual correction of No1, No3 and No4 are performed in the same manner. The same applies to the visual correction when drawing a circle or an ellipse and the visual correction when displaying other graphics.

In the above embodiment, a plurality of types of visual correction values are selected by an external key input operation. However, when the program data is loaded into the internal memory by the external memory, the visual correction values are used as a part of the program data. You may make it input the selection data of.

[0012]

According to the first aspect of the present invention, the screen configuration-specific parameter information corresponding to the designated screen configuration is selected from the plurality of screen configuration-specific parameter information corresponding to the respective screen configurations having different display configurations. It is possible to calculate each drawing coordinate position on the graphic figure in consideration of the selected parameter information for each screen configuration, and draw and display the graphic figure at each calculated drawing coordinate position, which is desired by the operator. Drawing display of a graphic figure corresponding to an arbitrary screen configuration can be performed based on each drawing coordinate position obtained by adding parameter information for each screen configuration. Second
According to the invention, among the parameters corresponding to the dot screen configurations having different display dot configurations, the parameter corresponding to the designated dot screen configuration is selected, and the selected parameter is added to the graphic figure. It is possible to calculate the coordinate information of each dot display coordinate position and draw and display the graphic figure based on the calculated coordinate information, and draw and display the graphic figure corresponding to the arbitrary dot screen configuration desired by the operator. Can be performed based on each drawing coordinate position obtained by adding a parameter.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a main part of an embodiment.

FIG. 2 is a diagram for explaining a first display state of the example.

FIG. 3 is a diagram for explaining a second display state of the example.

[Explanation of symbols]

 1 CPU 2 VIDEO RAM 3 Latch 4 Register 5 Selector 6 Multiplier

[Equation 1]

Claims (2)

[Claims] 1. A graphic drawing of a graphic figure such as a circle or a straight line
Graphic display that draws and displays based on the clock processing
In the device, multiple types of screen structures with different display configurations on the display screen
Specifying means for designating an arbitrary screen configuration, and a plurality of screen configuration-specific parameters corresponding to each of the above screen configurations.
Of the meter information, the screen configuration specified by the above specification means
Selector to select parameter information by screen configuration corresponding to
And the above graphic figure based on the above graphic processing
When drawing on the display screen, select with the above selection means
The above parameter is added to the screen configuration parameter information
Sequentially calculate each drawing coordinate position on the rough figure
And a drawing display at each drawing coordinate position calculated by this calculating means.
By doing the above graphic screen on the display screen
A graphic display device, comprising: a graphic drawing display means for drawing and displaying a shape . 2. Graphics such as circles and straight lines
Graphic display that draws and displays based on the clock processing
In the device, Multiple types of display dots with different configurations on the display screen
Specify any of the dot screen configurations
Specifying means, Multiple screen configurations corresponding to each of the above dot screen configurations
Of the different data, the dot screen specified by the above specification means
Selection means for selecting parameters corresponding to the configuration, On the graphic figure based on the graphic processing
Select the coordinate information of each dot display coordinate position in
Calculation by adding the above parameters selected by means
Means of delivery Dots based on each coordinate information calculated by this calculation means
By displaying the display coordinate position,
Graph to draw and display the above graphic figure on Quick drawing
Image display means, And The first dot screen configuration is designated by the designating means.
In this case, it is automatically selected according to this dot screen configuration.
The position of each dot calculated based on the first parameter
Draw the first graphic figure based on the standard information and
Different from the above first dot screen configuration depending on the designation means
When the second dot screen configuration is specified, this dot image
Second parameter automatically selected according to surface configuration
Based on the coordinate information of each dot calculated based on
Characterized by drawing 2 graphic figures
And a graphic display device.