JPS6249567A - Graphic display device - Google Patents

Abstract

PURPOSE:To display a grid of high density at a high speed by providing a segment generating/storing part which produces segments needed for display of the grid and stores them. CONSTITUTION:A segment generating/storing part 5 produces segments needed for display of a grid. When the grid is displayed, a CPU 3 supplies the segments obtained from a storage part 5 to a graphic display 1 via a graphic control part 2. Thus the desired segments are stored previously in the part 5 and therefore the grid can be displayed at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the display of grids during graphic display in a CAD/CAM system and during input in a word processor.

(Prior Art) FIG. 4 is a block diagram showing an example of the configuration of a conventional graphic display device (for example, Japanese Patent Publication No. 50-9367
(see issue). In the figure, 1 is a graphic display (hereinafter referred to as CD)! + Constructed using CRT or the like. Reference numeral 2 denotes a graphic control unit (hereinafter referred to as GDC) for managing the display of the CDI, which includes a storage device using an integrated circuit. Reference numeral 3 denotes a central processing unit (hereinafter referred to as CPU) comprising a so-called microcomputer, memory, etc., which controls the entire apparatus. 4 is a keyboard (hereinafter referred to as KB), on which graphic processing instructions are given by pressing predetermined keys.

In this device, specify the figure to be displayed as KH2,
The CPU 3 performs predetermined arithmetic processing to decompose it into points, circles, straight lines, etc. Then, determine in advance the code that indicates the figure to be displayed (circle, straight line, etc.) and the information necessary to display that figure (XY coordinates of the point to be displayed, XY coordinates of the starting point of the straight line, XY coordinates of the end point in 9 colors, etc.). GDC2 in the order of
, accesses the specified address of the storage device, and
to be displayed.

In such a device, the GDC 2 and the CPU 3 perform processing independently except when transferring graphic information as described above, and the CPU 3 is effectively used for other arithmetic processing during the graphic display processing. By making C1GDC2 have a circuit configuration dedicated to graphics, or by adding a special circuit dedicated to graphics processing, processing speed is increased.

(Problem to be Solved by the Invention) However, when displaying equally spaced grid points (hereinafter referred to as grid) as shown in Figure 2 on the CDI display screen using the device with the above configuration, the coordinates of each point are CP as graphic information
Since it is necessary to pass the data from U3 to GDC2 for display, there is a drawback that the processing time increases rapidly as the grid density increases.

The present invention is designed to reduce GD from CPU as grid density increases.
It is an object of the present invention to provide a device that can display a high-density grid at high speed by eliminating the problem of an increase in the number of times graphic information is transferred to C and the amount of data to be transferred.

(Means for Solving the Problems) The present invention relates to a graphic display device that includes a graphic display, a control unit that controls the display of the graphic display, and a central processing unit that controls the control unit and the graphic display.

The present invention provides a graphic display device configured as described above.
A line segment generation storage section is provided that generates line segments necessary for displaying the grid, and the display of the grid is performed by using the line segments read from the line segment generation storage section by the central processing unit or the control section on the graphic display. It consists of a lot of things that are done by supplying.

(Operation) When displaying a grid, for example, the central processing unit transfers line segments obtained from the line segment generation storage unit to the control unit. In this way, the line segments necessary to display the grid are stored in advance in the line segment generation storage section, so that the processing time when displaying the grid can be sped up.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Note that common elements are given the same reference numerals throughout the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. 1st
Figures 1.2 and 3.4 are GD and GD, respectively, as in Figure 4.
C, CPU and KB are shown. 5 is a line segment generation storage unit which processes and stores predetermined line segments to be displayed. 1st
In the device shown in the figure, the method of displaying figures is the same as before, but
When displaying a grid, the line segment generation memory unit 5 and the third
Generate line segments using the procedure shown in the figure. In FIG. 3, in the line segment generation process indicated by broken line 6, first
All coordinates are generated in the color that should be displayed as a grid of vertical lines. Next, in the grid generation process shown by broken line 7, for all X coordinates on the CDI, if the coordinates are the coordinates where the grid should be displayed, line segments are not generated;
If the coordinates do not require a grid, line segments of the background color are generated horizontally.

The line segments generated by the above processing procedure are passed to the GDC 2 under the control of the CPU 3 and displayed on the CDI in the order of occurrence, thereby displaying the grid shown in FIG. 2.

In the above explanation, line segments are displayed vertically, but the same result can be obtained even if the vertical and horizontal directions are switched. Generally, it is better to display line segments first on the side where the number of displayable dots in GD is larger.
It can be easily seen that the number of line segment occurrences decreases.

Furthermore, the line segment generation storage section 5 may be provided in the GDC 2.

FIG. 5 is a graph showing the relationship between grid density and time required for display, where a solid line 8 shows the processing time according to the conventional method, and a dotted line 9 shows the processing time according to this embodiment.

As can be seen from this figure, this embodiment can shorten the processing time compared to the conventional method when the grid density is high even at point a in FIG.
It is valid.

Furthermore, by determining point a in advance and displaying it using the conventional method when the grid density to be displayed is less than or equal to a, and displaying it using the method described in this example when it is 3 or more, it is possible to determine the grid density of any density. Even grids can be displayed at high speed.

(Effects of the Invention) As explained above, according to the present invention, when displaying a high-density grid, the processing time required to transfer data from the CPU to the GDC can be significantly reduced, and the CPU processing time due to the generation of line segments. The overall processing time can be shortened even if an increase in the GDC processing time required for line segment display is considered.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing an example of grid display, Fig. 3 is an operation flowchart of the embodiment shown in Fig. 1, and Fig. 4 is a conventional graphic display. A block diagram showing the apparatus and FIG. 5 are diagrams showing the relationship between grid density and display processing time. 1...Graphic display (GD), 2...
Graphic control unit (GDC), 3... Control unit (CPU), 4... Keyboard (KB), 5...
Line segment generation memory unit.

Claims (1)

[Scope of Claims] A graphic display device comprising a graphic display, a control unit that controls display of the graphic display, and a central processing unit that controls the control unit and the graphic display, comprising lines necessary for displaying a grid. A line segment generation storage section is provided for generating and storing the line segment generation storage section, and the grid is displayed by supplying the line segments read from the line segment generation storage section by the central processing unit or the control section to the graphic display. A graphic display device characterized in that: