JPH01236367A - Coordinate inputting system for graphic processor - Google Patents

Abstract

PURPOSE:To draw the drawing of the current conducting section between pins and, at the same time, to input coordinates with high accuracy by displaying a deformed grid on a display device and rounding inputted coordinates into the deformed grid. CONSTITUTION:A cursor for indicating the pattern of a previously selected deformed grid and coordinates inputted from a coordinate input device 10 is stored in a display memory 40 and the content of the memory 40 is displayed on a display device 50. When coordinates are inputted, an operator positions the cursor in the vicinity of a desired grid while he watches the screen of the display device 50 and the coordinates of the cursor are decided. The inputted cursor coordinates are rounded to the grating points of the deformed grid and the rounded coordinates are stored in a data memory 60. The series of such processes is executed by a CPU 20. Therefore, current conducting sections can be drawn regularly and easily in the narrow spaces among pins and the efficiency of the coordinate inputting work can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coordinate input method for a graphic processing device, and particularly to a coordinate input method suitable for designing a printed circuit board in a graphic processing device.

[Conventional technology]

Generally, a graphic processing device has a function of displaying a grid regularly arranged in a lattice shape on a display device and rounding coordinates input from a coordinate input device into the grid arranged in a lattice shape. Conventionally, in printed circuit board design using this type of graphic processing equipment, the regularly arranged grids described above have been used to draw the parts that conduct current between the pins of components such as ICs. Ta.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, when drawing a current-conducting part between the pins of a component, the distance between the pins is generally narrow, so the grid on the display device becomes dense and the coordinates are rounded to points other than the desired points. There was a problem in that it was difficult to input coordinates.

SUMMARY OF THE INVENTION An object of the present invention is to make it easy to draw current-conducting parts between pins and to input coordinates with high accuracy in a graphic processing device.

[Means to solve the problem]

The above purpose is to display a deformed grid on a display device with the purpose of drawing a current conducting part between pins of a component, and to round input coordinates to the deformed grid. This is achieved by

[For production]

The deformation grid corrects the coordinates input from the input device to the nearest rounding point.Thereby, by inputting the coordinates near the rounding point you want to input using the input device, you can change the coordinates between the pins of the part. It becomes possible to draw a desired current conduction part.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a graphic processing device to which the present invention is applied. This graphic processing device includes a coordinate input device 10 for inputting coordinates, a central processing unit 20 for executing various processes, a program memory (RAM) 30 for storing programs necessary for processing in the central processing unit 20, a grid and a graphic A display memory (RAM) 40 that stores image data for displaying , a display device 50 that displays the contents of the display memory 40 on a screen, and a data memory that stores the coordinates specified by the coordinate input device 1o rounded into a grid. (R
AM) Consists of 60. A coordinate input program 31 is stored in the program memory 30.

FIGS. 2 and 3 show examples of the shapes of deformed grids for the purpose of drawing current conducting portions between pins of components in printed circuit board design in this graphic processing apparatus. One of the deformed grids is selected and stored in the display memory 40 in advance.

FIG. 4 is a flowchart of coordinate input processing by the coordinate input program 31. The display memory 40 stores a preselected deformed grid pattern and a cursor indicating coordinates input using the coordinate input device 10, and the display device 5° displays the contents of the display memory 40. When inputting coordinates (step 101), the operator looks at the screen of the display device 50 and positions the cursor near the desired grid, thereby determining the cursor coordinates (step 1o2). The input cursor coordinates are rounded to the grid points of the deformation grid (step 1
03), the rounded coordinates are stored in the data memory 60 (step 104). These series of processes are executed by the central processing unit 20.

Next, an example of drawing by inputting coordinates using a deformed grid according to the present invention will be explained with reference to FIG.

FIG. 5 is an enlarged view of only the screen of the display device 50 in FIG. 1. Using the deformed grid of the shape shown in FIG. This is an example in which current conducting portions 505 and 506 are drawn from pin 503 to pin 504 of component B. To draw this diagram, follow the steps below.

(1) Place the pins of parts A and B on the grid displayed by the cross of the deformation grid.

(2) Position the cursor near the pin 501 of part A using the coordinate input device 10, and determine input coordinates for the pin 501 of part A using the coordinate input program.

(3) Next, use the coordinate input device 1o to select the grid lattice point 50.
The cursor is moved to the vicinity of point 7, and input coordinates are determined at grid lattice point 507 using the coordinate input program.

(4) Part B in the same manner as steps (2) to (3) above.
The necessary coordinate points up to the pin 502 are determined.

(5) If the coordinates (from pin 501 of component A to pin 502 of component B) determined by the steps (2) to (4) above are connected with a straight line using the drawing function of the graphics processing device, the current conducting portion 505 can be drawn.

(6) In the same manner as steps (2) to (5) above, part A
A current conducting portion 506 from pin 503 of component B to pin 504 of component B can be drawn, and the drawing as shown in FIG. 5 is completed.

According to this embodiment, it is possible to easily draw a current-conducting portion between pins of a component. Further, this is just an example, and it goes without saying that by preparing various deformed grids, the present invention can be applied to other fields than printed circuit board design.

〔Effect of the invention〕

As explained above, according to the present invention, when designing a printed circuit board in a graphic processing device, the portions where current is conducted between pins of closely spaced parts are regularly arranged.
Moreover, it is possible to easily draw a diagram, and the efficiency of coordinate input work is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a graphic processing device targeted by the present invention, FIGS. 2 and 3 are diagrams showing an example of the shape of a deformed grid used in the present invention, and FIG. 4 is a diagram according to the present invention. FIG. 5 is a flowchart showing the procedure for inputting coordinates, and is a diagram showing an example of drawing a current conducting part by inputting coordinates using a deformed grid. 10... Coordinate input device, 20... Central processing unit,
30...Program memory, 31...Coordinate input program, 40...Display memory, 50...Display device. 60...Data memory. , 50 Figure 2 Figure 3" Figure 10 Figure 5

Claims (1)

[Claims] (1) A graphics processing device that has a function of displaying a grid such as a lattice and rounding input coordinates to the grid, which is equipped with one or more deformation grids, and the deformation grid can be changed according to the purpose of drawing. A coordinate input method for a graphic processing device characterized by selecting and displaying and inputting coordinates.