JPS63189973A - Graphic display device - Google Patents

Abstract

PURPOSE:To prevent plural broken lines from being misunderstood so solid line even when the plural broken lines are partly duplicated and defined by calculating an end point position by considering segments to be one segment when a part of plural segments are duplicated and defined. CONSTITUTION:Three dimensional graphic information and display information from a graphic information input part 2 are stored in a graphic information storing part 3, converted to two dimensional data by the two dimensional converting module of a graphic converting part 4, then these bits of information except broken line information are supplied to a graphic information output part 5 via a broken line information check module 7, a display converting module 10 for every type of segment and are displayed as a picture. The broken line information, on the other hand, is fed to a duplicating display avoiding module 8 to decide whether it is partly duplicated on the broken line information stored in an internal memory 9 for the broken line or not, and when it is duplicated, data replaced by one broken line is calculated and the end point data is stored in the memory 9. The broken line data of this memory 9 is supplied to the module 10 and when it is partly duplicated, the broken line is prevented from being misunderstood as the solid line and the duplicated broken lines are effectively displayed in the picture as the broken line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a graphic display device that displays a graphic composed of line segments such as solid lines and broken lines on a screen.

(Prior art) Graphic display has traditionally displayed three-dimensional figures using line segments such as solid lines and broken lines (so-called wire frames) on a display such as a CRT, and is capable of performing strength calculations, motion simulations, etc. in mechanical design. The device is known.

However, in such a graphic display device, if parts of two or more broken lines are defined overlappingly, the broken lines may not be displayed as instructed.

In other words, if broken lines are defined in duplicate at a certain position, the broken lines will be displayed as solid lines in the overlapping area.

(Problem to be Solved by the Invention) In this way, in conventional graphic display devices, when parts of two or more broken lines are defined overlappingly on the display, the correct broken line display cannot be performed at the overlapped part. This poses a problem in that misunderstandings occur and design errors occur.

The present invention was made in view of the above circumstances, and even if a part of two or more broken lines is defined overlappingly on the display, the part will not be misunderstood as a solid line, thereby preventing design errors, etc. The purpose of the present invention is to provide a graphic display device in which there is no possibility of occurrence of such problems.

[Structure of the Invention] (Means for Solving the Problems) A graphic display device of the present invention includes a graphic information storage unit storing information indicating the position of at least an end point of a line segment to be displayed on a screen; When two or more line segments are defined to partially overlap on the screen, each of these line segments is regarded as one line segment, and the position of the end point is calculated and stored in the graphic information storage means. The apparatus includes a graphic information converting means and a graphic display means for displaying a line segment of the same type as the line segment between the calculated end points.

(Function) In the graphic display device of the present invention, when two or more line segments are defined to partially overlap on the screen, the function of the graphic information conversion means converts each of these line segments into one line. The position of the end point when considered as a minute is calculated, and the function of the graphic display means displays line segments of the same type as the line segment between the calculated end points, so for example, two or more broken lines The correct dashed line is displayed even if some parts of the line are duplicated.

(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In the same figure, 1 is CPLJ1 which controls the entire system.
2 is a graphical information input device for inputting various information using a keyboard, tablet, etc.; 3 is a graphical information storage device for storing graphical information; 4 is a graphical converting device for converting the inputted graphical information into graphical information for output; 5 is a graphical information output device such as an XY plotter or a graphic display that prints or outputs graphical information on a screen.

FIG. 2 is a block diagram showing an example of the configuration of the graphic converter 4. As shown in FIG.

In the figure, 6 is a two-dimensional conversion module that converts three-dimensional graphic data (solid) representing the shape of the actual article into two-dimensional graphic data (plane), and 7 is data that should be displayed with broken lines. A broken line information check module 8 searches the two-dimensional graphic data to determine whether or not parts of two or more line segments are defined overlappingly. If there are line segments that are broken, a duplicate display avoidance module considers those line segments as one line segment and defines their end points as new graphic data. An internal memory for storing broken lines is stored, and numeral 10 is a line type display conversion module that converts each figure data into data corresponding to the actual display according to the line type such as straight line or circular arc (it does not convert in the case of a solid line).

In this embodiment, first, when three-dimensional graphic information and display information are input from the graphic information input section 2, they are stored in the graphic information storage section 3.

The two-dimensional conversion module 6 then converts this graphic information into two-dimensional data that corresponds to the coordinate space of the display surface.

Roughly broken line information check module 7 converted this 2
It is determined whether the dimensional data is to be displayed as a broken line, and if it is to be displayed as a broken line, the control is transferred to the duplicate display avoidance module 8, otherwise the control is transferred to the line type display conversion module 10, and output data is obtained. and outputs it to the graphic information output section 5.

The duplicate display avoidance module 8 detects that when new two-dimensional graphic data is merged with the two-dimensional graphic data stored in advance in the internal memory for broken lines 9, there are places where the broken lines are defined as duplicates. Determine whether or not to do so.

If such a location exists, the corresponding graphic data is extracted and combined, data replaced with a single broken line is calculated, and the data at the end point is stored in the internal memory 9 for broken lines.

Note that if there is no partially overlapping graphic data defined, the new two-dimensional graphic data is stored as is in the internal memory 9 for broken lines.

Therefore, the internal memory 9 for broken lines stores two-dimensional graphic data that does not overlap with each other.

The graphic data stored in the internal memory for broken lines 9 is converted into a broken line display by the function of the line type-by-surface water conversion module 10, and is output to the graphic information output device 5.

FIGS. 3 to 5 are diagrams showing the process of changing data in the internal memory 9 for broken lines, which is carried out in the present embodiment when a part of the broken line is defined overlappingly at a certain position.

First, when the broken straight line AB as shown in FIG. 3(a) is defined, the coordinates of its end points A and B and the line are stored in the broken line internal memory 9 as shown in FIG. Graphic data indicating a seed (in this case, a straight line) is stored.

If the broken straight line EF as shown in FIG. 4(a) is defined to overlap with a part of the broken straight line AB, first, as shown in FIG. 4(b), the broken line The internal memory 9 stores graphic data indicating the coordinates of the end points E and F of the straight line EF and the line type (straight line in this case).

When the duplicate display avoidance module 8 searches the internal memory 9, it is determined that a portion of the straight line A8 and the straight line EF are defined overlappingly, and the graphic data of these straight lines is changed.

That is, the broken straight line AB and the broken straight line EF are combined and defined as a new straight line AF, and the end point A
, F are stored. The area between these end points A and B is displayed as a broken line.

Thus, according to this embodiment, even if a portion (between EB) of the broken line AB and the broken line EF are defined overlappingly, the part between the end points AF is displayed as a broken line with the correct pitch.

In this embodiment, the present invention is explained with reference to a straight line with a broken line. However, for example, in the case of a circular arc, it is possible to apply an arc that is defined on the same center, and some of the arcs may be defined overlappingly. In this case, a method such as expressing the end point of the arc by a starting angle and a ending angle may be considered.

Further, in this embodiment, the present invention is explained with respect to broken line display, but other line segments such as a dashed line or a dashed double dot line may also be displayed.
The same can be applied.

[Effects of the Invention] As explained above, in the graphic display device of the present invention, when two or more line segments are defined to partially overlap on the screen, each of these line segments is treated as one line segment. The position of the end point is calculated based on the calculated end point, and a line segment of the same type as the above line segment is displayed between the calculated end points. However, the part will not be misunderstood as a solid line, and there will be no risk of design errors or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a figure conversion device in the same embodiment, and FIGS. 3 to 5 show broken line data in the same embodiment. FIG. 6 is a diagram illustrating a process of changing data in the case of duplication. 1........CPU 2........Graphic information input section 3........Graphic information storage section 4......Graphic Conversion unit 5...Graphic information output unit 6...Two-dimensional conversion module 7...
...Dotted line information check module 8...
...Duplicate display avoidance module 9...Internal memory for broken lines 10...Line type surface water conversion module Applicant Toshiba Corporation Agent Toshiba Computer Engineering Corporation Person Patent Attorney Satoshi Suyama - Figure 1, Figure 2, Figure 3, Voice F, Figure 4, Figure 5

Claims (2)

[Claims] (1) A graphic information storage means storing information indicating the position of at least the end point of a line segment to be displayed on the screen; When each of these line segments is regarded as one line segment, a graphic information conversion means calculates the position of the end point thereof and stores it in the graphic information storage means; 1. A graphic display device comprising: graphic display means for displaying line segments. (2) The graphic display device according to claim 1, wherein the line segment is a broken line.