JPS6360916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grid point generator for a graphic display for speeding up the display of grid points.

When displaying grid points on a graphic display, in current displays, the coordinate position of each grid point is generated by a computer and then transferred to the display device. For this reason, for example, if there are 10 x 10 grid points, it is necessary to transfer 100 orders and data, so the amount of data to be transferred to the display device is large, and all grid points cannot be displayed. It takes a long time to finish.
Since it is necessary for a computer to generate display orders for grid points, the computer load naturally increases.

The present invention is intended to solve the above-mentioned problems, and aims to display grid points at high speed and reduce computer load. To this end, the present invention provides a grid point generator on the display side, and transfers only the necessary order and data from the computer, such as how many vertically, how many horizontally, and how many pitches. This feature is characterized in that grid points are displayed on the display side based on the above information. Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of the configuration of a graphic display device, and FIG. 2 is an explanatory diagram of generation of a drawing signal. In the figure, 1 is a computer, 2 is an interface circuit, 3 is a microprocessor, 4 is a pattern generator, 5 is a memory, 6 is a display, and 7
8 indicates a light pen, and 8 indicates a vector generator.

The information from the computer 1 is decoded by the microprocessor 2, and the pattern generator 4 outputs the information according to the order.
sends data to and controls it. In addition to the vector generator 8, the pattern generator 4 includes a character generator, a point generator, a circle generator, and the like. The information output from the pattern generator 4 is written into the memory 5 as pixel data. The information is stored in the memory as a single figure, and is converted into a television signal by a video signal generator (not shown) and output. be done.

When displaying l _x × l _y grid points on the display, the calculator 1 inputs the reference coordinate position (x ₀ , y ₀ ) and the number of horizontal and vertical grid points (l _x , l _y ) and the grid point pitch (Δx, Δy) data are transferred to the display side B as necessary grid point information. Of course, it goes without saying that the order for grid point display is also sent together. In response to this, on the display side B, as shown in FIG. Generates a drawing signal that is a horizontal line of dotted lines. The horizontal straight line of the vector generator 8 is a straight line with a starting point (x _p , y _s ) and an ending point (x _e , y _s ) given, and it is changed vertically, that is, by changing y _s one after another. By drawing several parallel lines, grid points are displayed by arranging horizontal dotted lines in parallel vertically. The algorithm for processing the above flow using firmware is as follows.

i=0; First, perform initial settings.

x _e =x _p +Δx*(l _x −1); Find the end point x _e from the starting point x _p based on the pitch Δx and the number of horizontal grid points.

if i<l _y then next else end; In the judgment step, if i is smaller than _ly , proceed to the next step.

y _s = y _p + i*△y; y is a variable and changes by △y from y _p .

Move to (x _p , y _s ) without emitting a beam.

Sweep the beam to (x _e , y _s ) and draw a dotted line with an interval Δx.

i=i+1 Return to

As is clear from the above description, according to the present invention, l _x horizontal lines of dotted lines are created at intervals of △x from the coordinate position (x _p , y _p ), and they are sequentially moved vertically by △y. Since the grid points are displayed by shifting the dotted lines horizontally in l _y stages, when displaying l _x × l _y grid points, the amount of data to be transferred is (1 + α) / (l _x + l _y )... (α ≦2)
Since the time required for display is the time required to draw ly vectors, it is much shorter than drawing l _x × _ly grid points one _by one. Also, in a computer, just by generating one order (l _x ×l _y )
Since grid points can be displayed, it is approximately 1/(l _x × l _y )
of computer time, and the effect is extremely significant.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a graphic display device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of generation of a drawing signal according to the present invention. 1... Computer, 2... Interface circuit,
3...Microprocessor, 4...Pattern generator, 5...Memory, 6...Display, 7...
Light pen, 8... Vector generator, 9... Beam control signal generator, 10... AND means.

Claims (1)

[Claims] 1. In a graphic display grid point generator that receives grid point information and displays grid points on a graphic display, the grid point information includes the reference coordinate position (x ₀ , y ₀ ), horizontal and vertical directions. Beam control that receives data on the number of lattice points (l _x , l _y ) and the pitch between lattice points (△x, △y) and generates pulses at intervals corresponding to the pitch between lattice points based on the data a signal generating means; a vector generating means for sequentially generating a plurality of linear signals along the coordinate axes given a starting point and an ending point based on the data; and generating a drawing signal by performing a logical product of the pulse and the linear signal. 1. A grid point generator for a graphic display, characterized in that it is provided with logic means.