JPH03211675A - Cad drawing display system - Google Patents

Abstract

PURPOSE:To obtain well balanced display extending over a whole picture by dividing a display picture into plural blocks, and determining the priority order of an object to be thinned in every block. CONSTITUTION:A coordinate calculation processing part 14 which receives the outputs of a pattern memory 11 and block divided number memory 12 and decides at what place a segment of a straight line outputted from the pattern memory 11 is located and an intra-block pattern comparison processing part 15 which receives that outputs of a display number memory 13 and the coordinate calculation processing part 14, and selects only a necessary number of the segments of the straight line from the segment of the higher priority order for every blocks are provided. Then, the display picture is divided into plural blocks, and the priority order (order of larger length) of the object to be thinned (for instance, length of segment) is determined for every divided block, and the picture is displayed by limiting the number of the displayed segments in the block in the order of larger length. Thus, thinned display well balanced extending over a whole picture can be obtained, and time required for processing can be shortened.

Description

[Detailed Description of the Invention] [Summary] Regarding a display method for displaying CAD drawings on a display screen, the present invention aims to provide a well-balanced display on the entire screen when CAD drawings are thinned out and displayed. The screen is divided into a plurality of blocks, a priority order of thinning targets is determined for each divided block, and drawing information is displayed for each block according to the determined priority order.

[Industrial Application Field] The present invention relates to a display method for displaying a CAD (computer-aided design) drawing on a display screen (graphic display), and more particularly to a method for thinning out and displaying drawing information.

[Background Art] When drawings are designed using a CAD system, the designed drawings are sequentially stored in a drawing storage file. When displaying CAD data stored in a drawing storage file on a graphic display, if drawing data larger than the screen size is displayed at a magnification of 1, in order to see the entire drawing, the screen must be scrolled. It is necessary to move the area. For this reason, if you reduce the drawing so that the entire drawing fits on the screen, complex parts will be too crowded and difficult to see, and unnecessary parts will be used to process minute parts that are meaningless (i.e., unreadable) even if displayed. Processing resources (CPU time) will be used.

Therefore, in the prior art, there are methods that simply display the lines in the order stored in the drawing storage file and limit the display amount at a certain point, or display the lines in the order of the longest overall line segment length.
A method of limiting the display amount is used in some places.

[Problem to be Solved by the Invention] Therefore, with the conventional method, in a drawing where line segments are evenly distributed throughout, an abbreviated drawing that shows the entire drawing is displayed by the above-mentioned process, but short line segments In drawings that are partially skewed, there is a problem in that only those parts are concentrated and cannot be displayed.

FIG. 4 is an explanatory diagram of a conventional thinned-out display method.

If, for example, a thinning-out display method is used in which line segments are displayed in order of length in the drawing shown in (a), the drawing portions consisting of short line segments will not be displayed in a concentrated manner as shown in A in (b).

The present invention has been made in view of such problems, and is a CA that can provide a well-balanced display on the entire screen when displaying CAD drawings with thinning.
The purpose is to provide a drawing display method.

[Means for Solving the Problems] FIG. 1 is a flowchart showing the principle of the system of the present invention. In the case of thinning out and displaying drawing information to be displayed on a display screen, the present invention provides the following steps: dividing the display screen into a plurality of blocks (step 1), determining priorities for thinning targets for each divided block (step 2); The drawing information is displayed for each block according to the assigned priority order (step 3).

[Operation] The display screen is divided into a plurality of blocks, and the priority order (longest order) of thinning targets (for example, line segment length) is determined for each divided block. By doing this, even if a certain block is a drawing consisting of short line segments, if you limit the number of line segments displayed in that block in descending order of length, you can display them on a block-by-block basis. This eliminates the problem of blank display in a specific area as shown in the figure. In other words, a well-balanced thinned-out display can be obtained on the entire screen.

Moreover, since the display of short line segments for each block can be omitted, the time required for processing can be shortened.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing an example of the configuration of a CAD system implementing the present invention. In the figure, 1 is a disk (drawing storage file) that stores drawing information, 2 is a keyboard for inputting the number of divisions of the display screen and the number of displays to be displayed in divided blocks, etc., and 11 holds the graphic information read from disk 1. 12 is a block division number memory that holds the block division number input from the keyboard 2; and 13 is a display number memory that holds the display number input from the keyboard 2.

14 is a coordinate calculation processing unit that receives the outputs from the graphic memory 11 and the block division number memory 12 and determines where in the block the line segment output from the graphic memory 11 is located;
Reference numeral 5 denotes an intra-block figure comparison processing unit which receives the outputs from the display number memory 13 and the coordinate calculation processing unit 14 and selects the necessary number of high-priority line segments for each block; 16 indicates the intra-block figure comparison processing unit 15; This is a display data output unit that receives the output of and outputs display data. These graphic memories 11. Block division number memory 121 Display number memory 13
．． Coordinate calculation processing section 14. Intra-block figure comparison processing unit 15
and the display data output section 16 constitute the system main body 10.

20 is a display device for displaying graphic information, and a display control unit 21
and a graphic display 22.

The present invention will be described below using a system configured as described above.

When you enter the number of block divisions (vertical, horizontal) and the number of line segments to be displayed for each block (display number) from the keyboard 2, the number of block divisions is stored in the block division number memory 12, and the display number is stored in the display number memory 13. be done. Next, the CAD data stored on the disk 1 is read into the graphic memory 11 (this is normal CAD processing).

The contents of the figure memory 11 and the contents of the block division number memory 12 are read out by the coordinate calculation processing section 14, and the coordinates of each individual block are calculated from the coordinate data of the figure of the size of the entire display area, and each line segment figure is Calculate which block it is in. Then, information on which block each line segment calculated by the coordinate calculation processing section 14 is located is sent to the intra-block figure comparison processing section 15.

The intra-block figure comparison processing section 15 includes the coordinate calculation processing section 14.
The length of the line segments sent from the display number memory 13 is checked, and the line segment data is sent to the display data output section 16 in the order of the longest line segments so that the length is within the display number inputted from the display number memory 13. The data sent to the display data output unit 6 is sent to the display control unit 21.
It is displayed on the graphic display 22 via.

FIG. 3 is an explanatory diagram of the thinning display method according to the present invention.

If the figure shown in (a) (same as in Figure 4) is divided into multiple blocks and a certain number of long line segments are read out and displayed in each divided block, a specific part as shown in (b) will be created. A well-balanced display can be obtained without the problem of disappearing.

In the above-described embodiment, a case is shown in which line segments are used as thinning targets. However, the present invention is not limited to this, and other objects (one circle, one arc, one character).

Symbols) etc. can be used to display these objects in descending order of size.

[Effects of the Invention] As described in detail above, according to the present invention, a display screen is divided into a plurality of blocks, and the priorities (longest first ). By doing this, even if a certain block is a drawing consisting of short line segments, if you limit the number of line segments displayed in that block in descending order of length, you can display them on a block-by-block basis. This eliminates the problem of blank display in a specific area as shown in the figure. In other words, a well-balanced thinned-out display can be obtained on the entire screen.

Moreover, since the display of short line segments for each block can be omitted, the time required for processing can be shortened.

[Brief explanation of drawings]

Fig. 1 is a 70-chart showing the principle of the method of the present invention, Fig. 2 is a diagram showing an example of the configuration of a CAD system implementing the invention, Fig. 3 is an explanatory diagram of the thinning display method according to the invention, Fig. 4 is an explanatory diagram of a conventional thinned-out display method. In FIG. 2, 1 is a disk, 2 is a keyboard, 10 is a system body, 11 is a figure memory, 12 is a block division number memory, 13 is a display number memory, 14 is a coordinate calculation processing unit, 15 is an intra-block figure comparison process 16 is a display data output section, 20 is a display device, 21 is a display control section, and 22 is a graphic display relay.

Claims (1)

[Claims] When displaying drawing information to be displayed on a display screen in a thinned out manner, the display screen is divided into a plurality of blocks (step 1), and a priority order of thinning targets is determined for each divided block (step 2). ), the CA is characterized in that drawing information is displayed for each block according to a predetermined priority order (step 3).
D Drawing display method.