JPH07234885A - Drawing display system in cad system - Google Patents

Abstract

PURPOSE:To provide a drawing display system in CAD system for facilitating operations, easily discovering the design change part of a drawing and further preventing the design change part from being missed even in the case of any complicated drawing. CONSTITUTION:Concerning the drawing displayed on a graphic display device 11, its drawing number and the number of editions are investigated by a drawing retrieval processing part 14, the drawing data in the former edition of that drawing are retrieved from a drawing data file 15, the reference positions of new and former drawings for each projection plane are detected by a projection plane reference point detection part 16, and the relative positions of respective projecting planes are corrected by a projecting plane correction part 17. Then, the different parts of new and former drawings are detected by a comparative different part detection processing part 18, and a changed element, added element and erased element with a design change are distinguished from non- changed parts by a change identification display part 19 while changing its display color or display luminance and displayed on the same screen of the graphic display device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing display system in a CAD (computer aided design) system used in machine design, and particularly to a mechanical CAD system for creating a machining drawing to be referred to when machining a machine part. The present invention relates to a drawing display system in a system.

[0002]

2. Description of the Related Art Conventionally, in the process of machining a mechanical part, when machining a part, a machining drawing created by a mechanical CAD system is referred to. If it is necessary to confirm the changed part in the new version number drawing (hereinafter referred to as the new drawing) regarding the processed drawing in which the design change occurs, the new drawing and the old version number drawing (hereinafter referred to as the old drawing) Were displayed separately on the screen, and the operator confirmed the changed parts by alternately comparing the drawings on the screen.

[0003]

However, in the drawing display method in the conventional CAD system, when confirming the changed portion of the drawing in which the design change has occurred, each drawing data of the new drawing and the old drawing is called to obtain the new drawing. Since it is necessary to display the old drawing and the old drawing on the screen respectively, the operation becomes complicated, and it is difficult to find the design change part to check the drawings separately, and the design change part is overlooked when the drawing becomes complicated. There was a problem that it was easy.

The present invention has been made in view of the above problems, and an object thereof is to easily operate and easily find a design change portion of a drawing, and to overlook a design change portion even in a complicated drawing. It is to provide a drawing display method in a CAD system capable of preventing the above.

[0005]

The drawing display system according to claim 1 comprises a drawing data file storing each drawing data of a new drawing and an old drawing of the new drawing, and the drawing stored in this drawing data file. In a CAD system for displaying a drawing on a screen based on data, a searching means for searching the drawing data file for drawing data of an old version drawing for a new version drawing displayed on the screen,
Position correction means for correcting the relative position for each projection plane drawn on each of the two drawings based on the drawing data of the new version number drawing and the drawing data of the old version number drawing retrieved by the searching means, and this position The new version number drawing and the old version number drawing whose position has been corrected by the correction means are displayed on the same screen.

According to the drawing display system of claim 2,
In the drawing display system described, further, a different portion detecting means for detecting a different portion between the new drawing and the old drawing whose position is corrected by the position correcting means for each projection plane, and the different portion detected by the different portion detecting means. And an identification display means for identifying and displaying on the screen.

[0007]

In the drawing display system according to claim 1, the drawing data of the old drawing for the new drawing displayed on the screen is searched from the drawing data file and drawn on each of the old drawing and the new drawing based on this drawing data. The relative positions of the projected planes are corrected so that the projected planes coincide with each other, and then displayed on the same screen. Then, the new drawing and the old drawing are displayed in duplicate on the same screen except for the design change. Therefore, the non-overlapping portion can be easily identified as the design change portion.

In the drawing display system according to the second aspect, the difference between the new drawing and the old drawing whose position is corrected for each projection plane is detected, and the different portion is identified and displayed on the screen. According to this, a different portion such as a changed portion or an added portion due to the design change is displayed separately from the unchanged portion on the screen. Therefore, the identified portion can be easily recognized as the design change portion.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a functional block diagram showing an embodiment of a drawing display system according to the present invention, and FIG. 2 is a configuration diagram of a general CAD system. In FIG. 2, the drawing data file 2
In FIG. 1, the drawing data of the new drawing after the design change and the drawing data of the old drawing for the new drawing are stored.
This drawing data file 21 is a LAN (local area ne
two rk) 22 and is connected to a graphic data file control device 23.

The graphic data file control device 23 extracts desired drawing data from the drawing data file 21 and stores it in the graphic storage device 24. The graphic processing device 25 is composed of, for example, a microcomputer, and after performing various processes relating to graphic display on the drawing data stored in the graphic storage device 24 based on a function menu designated by the keyboard 26 or the mouse 27. , Graphic display device 2
Control for displaying a predetermined figure on the display 8.

Next, the drawing display system according to the present invention will be described with reference to the functional block diagram of FIG. In addition,
The processing function described below is a function of the graphic processing device 25 in FIG. In FIG. 1, a graphic display device 1
From the function menu displayed in 1, the mouse 12 is operated to select the function menu according to the present invention, that is, the function menu for comparing and displaying the difference between the new drawing and the old drawing.

The function menu selection processing unit 13 uses the mouse 1
The function menu selected by 2 is judged, and the processing is started. The drawing search processing unit (search means) 14 checks the drawing number and version number of the drawing displayed on the graphic display device 11, and searches the drawing data file 15 for drawing data of the old version number of the drawing. The retrieved drawing data is sent to the projection plane reference point detection unit 16.

By the way, in the CAD system, it is general to use the drawing data before the design change for the drawing for which the design is changed. However, the position of each projection plane may move depending on the change contents. The relative position of each projection plane may be different between the drawing before the design change and the drawing after the design change.

Therefore, before the comparison processing between the new drawing and the old drawing is carried out, the projection surface reference point detection unit 16 detects the reference position for each projection surface of the new and old drawings, and the projection surface correction unit 17 is provided. The relative position of each projection plane is corrected with. The projection plane reference point detection unit 16 and the projection plane correction unit 17 constitute position correction means.

First, in the projection plane reference point detection unit 16,
The projection planes of the new and old drawings as shown in FIG.
Divide by 1 to 34. Further, the coordinates of the elements existing in the divided surface are checked to find the element maximum areas 35 to 40 for each projection surface, and this is determined as the projection surface area.

Next, in FIG. 4, the same line length elements (or the same circumference length elements) 41 and 42 existing in common in the corresponding projection planes of the new and old drawings are extracted. Further, it is checked whether or not the element end points 43 to 46 are at the same relative position with respect to the projection plane areas 35 and 38, and if they are the same relative position, one of these element end points 44 and 46 is regarded as the unchanged element and the one of the element end points 44 and 46 is set as the projection plane. Determine as a reference point.

The above processing is performed for all projection planes. Further, in the above-mentioned processing, if the same line length element cannot be found, or if all the found element end points are not at the same relative position, it is determined that the drawing is a completely changed drawing, and the lower left corners 47, 48 of the projection surface are set as the projection surface reference It is a point.

In the projection plane correction unit 17, the coordinates of the projection plane reference point 46 of the old drawing and the coordinates of the projection plane reference point 44 of the new drawing are compared, and if there is a difference, the displacement vector amount corresponds to the old drawing. Move the coordinates of each element end point in the projection plane area of
The reference points of the projection planes of both drawings are made to coincide. This process
Perform on all other projection planes.

Next, in the different portion comparison / detection processing unit (difference portion detecting means) 18, the elements in each projection plane area of the old drawing are vector-moved, so that the projection surfaces of the new and old drawings are superposed together. Of the elements that overlap between the two drawings, the elements (41, 42, 4
9 and 50, 51 and 52), 41, 49 and 51 are determined as elements that do not change.

Elements that overlap but do not match one or both of the end points of the two elements (53 and 54, 55 and 5).
53, 55 and 57 in 6, 57 and 58) are determined as changed elements. Next, among the elements that do not overlap, the elements 59 and 60 existing only in the new drawing are determined as the elements added to the new drawing. In addition, the element 61 existing only in the old drawing
Is determined to be a deleted element in the new drawing.

Change section identification display section (identification display means) 19
Can be displayed on the screen in two ways, that is, a changed part identification display only for new drawings and a changed part composite display for new and old drawings. The selection of these methods is specified by the operator by the function menu selection processing unit 13 when selecting this function menu.

In the changed portion identification display of only the new drawing, the display colors of the changed element 62 and the added element 63 shown in FIG. Display on screen. Further, in the combined display of the changed parts of the new and old drawings, the two drawings are overlapped and displayed as follows.

That is, in FIG. 6, the element 64 existing only in the old drawing is displayed in a low brightness with a display color distinguished from others. Further, the element 65 which is not changed in the new drawing is displayed in the standard brightness in the display color distinguished from the others. Furthermore, the element 66 changed in the new drawing and the element 6 added in the new drawing
7 is displayed with a high brightness in a display color distinguished from the others. As described above, the changed element, the added element, and the deleted element are displayed separately on the screen by changing the display color and the display brightness.

[0024]

As described in detail above, according to the invention of claim 1, the drawing data of the old drawing for the new drawing displayed on the screen is searched from the drawing data file, and the drawing data is converted into this drawing data. Based on each of the projection planes drawn on the old drawing and the new drawing based on each other, the relative position is corrected so that the projection planes match and the images are displayed on the same screen. Will be displayed in duplicate on the same screen except for design changes, so you can easily identify non-overlapping parts as design changes and manually align the projection plane to check the changes. You will be freed from the hassle of doing.

According to the second aspect of the present invention, the different portion between the new drawing and the old drawing whose position is corrected for each projection plane is detected, and the different portion is identified and displayed on the screen. By doing so, different parts such as changed parts and added parts due to design change can be displayed separately from unchanged parts on the screen, making it easy to find design change parts even in complicated drawings and design changes It will also be possible to prevent oversight of locations.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a drawing display system according to the present invention.

FIG. 2 is a configuration diagram of a general CAD system.

FIG. 3 is a diagram showing an example of a display drawing.

FIG. 4 is a diagram showing one projection plane of a new drawing and an old drawing.

FIG. 5 is a diagram showing a display example.

FIG. 6 is a diagram showing another display example.

[Explanation of symbols]

 11 Graphic Display Device 13 Function Menu Selection Processing Unit 14 Drawing Search Processing Unit 15 Drawing Data File 16 Projection Plane Reference Point Detection Unit 17 Projection Plane Correction Unit 18 Difference Part Comparison Detection Processing Unit 19 Change Part Identification Display Unit

Claims (2)

[Claims] 1. A CAD comprising a drawing data file for storing each drawing data of a new version number drawing and an old version number drawing for the drawing, and displaying the drawing on a screen based on the drawing data stored in the drawing data file. A drawing display method in the system, wherein the searching means searches the drawing data file for drawing data of the old version drawing of the new version drawing displayed on the screen, and the drawing data of the new version drawing and the searching means. And a new version drawing position-corrected by the position correction means, which comprises position correction means for correcting the relative position for each projection plane drawn in each of the two drawings based on the retrieved drawing data of the old version drawing And a drawing display method in a CAD system, which displays old version drawings on the same screen. 2. A different portion detecting means for detecting a different portion of the new version number drawing and the old version number drawing position-corrected for each projection plane by the position correcting means, and a different part detected by the different portion detecting means. 2. A drawing display system in a CAD system according to claim 1, further comprising: an identification display means for identifying and displaying on a screen.