JPH05298058A - Graphic data processor - Google Patents

Abstract

PURPOSE:To simply change over the output positions of the respective dots of the graphic data generated by graphic data processing. CONSTITUTION:A CPU 1, corresponding to graphic instructions, generates the graphic data such as straight lines and circles or the like, and outputs its output coordinate data (x.y). Based on input data optionally specified by an operator separately from this output, the CPU 1 selects one of register 41-45 to store the various kinds of correction values by a selector 5. Thus, the 'y' coordinate data of the output coordinate data is calculated with the correction value outputted from the selector 5, the 'y' coordinate data outputted from the CPU 1 is corrected, and supplied to a VIDEO RAM 2.

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 the screen of a CRT display device or drawing a circle having a designated diameter by its arithmetic processing. It is possible. Thus, the dot structure of the conventional CRT display device for performing graphic display is usually 640 horizontal × 200 vertical, and the ratio of the horizontal to vertical of the CRT screen is 4: 3. Therefore, when the display area of such a CRT screen is directly applied to the xy coordinates and the 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 it was 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 a straight line cannot be visually drawn correctly, and similarly a 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 performed 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 vertically). An object of the present invention is to make it possible to easily switch and change the output position of each dot of graphic data generated by graphic data processing.

[0004]

The means of the present invention are as follows. Generating means for generating output coordinate data of each dot of graphic data by graphic data processing, designating means for arbitrarily designating change data for the output coordinate data, and calculating the output coordinate data by the change data. Change means for changing the output coordinate data to new output coordinate data, and output means for outputting a dot to the output position of the corresponding coordinate according to the output coordinate data changed by the changing means. The main position of the dot can be switched to any position.

[0005]

The operation of the means of the present invention is as follows. The generation means generates output coordinate data of each dot of the graphic data based on the graphic data processing. At this time, if the operator arbitrarily specifies the change data for the output coordinate data by the specifying means so as to be switchable, the changing means calculates the output coordinate data by the change data to obtain new output coordinate data. change.
As a result, the output means outputs a dot at the output position of the corresponding coordinate according to the output coordinate data changed by the changing means. In this way, the dot output position can be arbitrarily switched by switching the designation by the designating means.
Therefore, it is possible to easily switch and change the output position of each dot of the graphic data by the graphic data processing, and it is possible to output the graphic data in an output form desired by the operator.

[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 operations of this electronic 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 store the respective 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 output unit 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, so that 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, a straight line of the formula (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 seems that 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, all subsequent drawing is performed after visual correction. 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 correct 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 by 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 resultant 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 of the CRT display device is displayed as shown in FIG.
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, and the display is reduced and the coordinate position in the vertical direction is reduced.

In the above-described 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 also 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 kinds 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 included as a part of the program data. You may make it input the selection data of.

[0012]

According to the present invention, the output position of each dot of the graphic data can be easily switched and changed by the graphic data processing, and the graphic data can be output in the output form desired by the operator. Becomes

[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 embodiment.

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 (1)

[Claims] 1. A generating means for generating output coordinate data of each dot of graphic data by graphic data processing, a designating means for arbitrarily designating change data for the output coordinate data, and the output coordinate data. The designating means comprises: changing means for calculating by the change data to change to new output coordinate data; and output means for outputting a dot to an output position of corresponding coordinates according to the output coordinate data changed by the changing means. A graphic data processing device characterized in that the output position of the dot can be arbitrarily switched by switching the designation by the.