JP3410540B2 - Drawing display method in CAD system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing display method in a CAD (computer aided design) system used in designing a machine, and more particularly, to a method for processing a machine part. The present invention relates to a drawing display method in a mechanical CAD system for creating a processing drawing to be referred to. 2. Description of the Related Art Conventionally, in the process of processing a mechanical part, when processing the part, a processing drawing created by a mechanical CAD system is referred to. At this time, with respect to the processed drawing in which the design change has occurred, if it is necessary to confirm the changed portion in the new version drawing (hereinafter, referred to as a new drawing), the new drawing and the old version drawing (hereinafter, referred to as the old drawing) Are displayed on the screen separately, and the operator confirms the changed portion by comparing each drawing alternately on the screen. [0005] However, in the drawing display system in the conventional CAD system, when confirming a changed portion of a drawing in which a design change has occurred, each drawing data of a new drawing and an old drawing is called. In addition to the need to display the new drawing and the old drawing on the screen, the operation becomes complicated, and it is difficult to find the design change part because the drawings are checked separately, and if the drawing becomes complicated, the design change There was a problem that a part was easily overlooked. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to easily operate a design and easily find a design change portion in a drawing, and to overlook a design change portion in a complicated drawing. It is an object of the present invention to provide a drawing display method in a CAD system which can prevent the problem. A drawing display system according to the present invention includes a drawing data file for storing each drawing data of a new drawing and its related old drawing, and the drawing data file is stored in the drawing data file. In a CAD system for displaying a drawing on a screen based on drawing data, a search means for searching the drawing data file for drawing data of an old version drawing for a new version drawing displayed on the screen, and a drawing of the new version drawing A dividing line determined in advance based on the data and the drawing data of the old version drawing retrieved by the retrieval means;
Divides the elements of the new / old version drawing, and within each divided area
The line length or perimeter of the new and old edition drawings and the relative positions of the endpoints
Extracts the same element and marks the end point of the same element as the new or old
A reference point detecting means serving as a reference point of the version number drawing;
The reference points of the new and old version drawings are
Move the coordinates of the end points of each element in the new and old version drawings.
And a position correcting means that. [0006] Further, position compensation is performed by the position compensating means.
By comparing the coordinates of the endpoints of each element in the corrected new and old version drawings
And a different part detecting means for detecting a different part between the new version drawing and the old version drawing, and an identification display means for identifying the different part detected by the different part detecting means and displaying it on a screen. ing. [0007] [action] In the drawings display system of the above-described configuration, searches the drawing data of the old version number drawings for the new version number drawing that is displayed on the screen from the drawing data file, both of these drawings Day
Based on the data, the new and old version
Elements are divided, and new and old version numbers are drawn in each divided area.
Extracts elements with the same length or circumference and the same relative position of end points
The end point of the same element is used as the reference point for the new and old version drawings.
I do. In addition, for each divided area, the base
The end points of each element in the new and old version drawings should be
Move coordinates. [0008] Then, each of the new and old version number drawings whose position has been corrected.
By comparing the coordinates of the element end points, the new version number drawing and
A different part of the old version number drawing is detected, and the different part is identified and displayed on the screen. According to this, different parts such as a part changed by the design change and a part added are displayed on the screen as distinguished from the parts not changed. Therefore, the location identified and displayed can be easily recognized as a design change location. Embodiments of the present invention will be described below 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, drawing data file 2
1 stores the drawing data of the old drawing for the new drawing together with the drawing data of the new drawing after the design change.
This drawing data file 21 is a LAN (local area ne
2 is connected to the graphic data file control device 23 via the tworks 22. The graphic data file control device 23 extracts desired drawing data from the drawing data file 21 and stores the data in the graphic storage device 24. The graphic processing device 25 is composed of, for example, a microcomputer, and performs various processes related to graphic display on drawing data stored in the graphic storage device 24 based on a function menu designated by a keyboard 26 or a mouse 27. , Graphic display device 2
The control for displaying a predetermined figure is performed on the display unit 8. Next, a drawing display method according to the present invention will be described with reference to the functional block diagram of FIG. In addition,
The processing functions described below are functions that the graphic processing device 25 in FIG. 2 performs. In FIG. 1, a graphic display device 1
The user operates the mouse 12 from the function menu displayed in 1 to select a function menu according to the present invention, that is, a function menu for comparing and displaying different parts between the new drawing and the old drawing. The function menu selection processing unit 13 includes a mouse 1
The function menu selected in step 2 is determined, and the process is started. The drawing search processing unit (search means) 14 checks the figure 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 searched drawing data is sent to the projection plane reference point detection unit 16. By the way, in a CAD system, for a drawing for which a design change is to be made, it is common to use drawing data before the design change, but since the position of each projection plane may move depending on the contents of the change, The relative position of each projection plane may be shifted between the drawing before the design change and the drawing after the design change. For this purpose, before the comparison process between the new drawing and the old drawing is performed, the projection plane reference point detecting section 16 detects the reference position of each of the projection planes of the new and old drawings, and the projection plane correcting section 17. Corrects the relative position of each projection plane. The projection plane reference point detection unit 16 and the projection plane correction unit 17 constitute a position correction unit. 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 plane are checked to determine the element maximum areas 35 to 40 for each projection plane, and this is determined as the projection plane area. Next, in FIG. 4, the same line length elements (or the same circumference elements) 41 and 42 existing in common on 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. If the element end points 43 to 46 are at the same relative position, one of the element end points 44 and 46 is set as an element without change and the projection ends. Determine as a reference point. The above processing is performed for all projection planes. In the above-described 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 has been entirely changed and the lower left corners 47 and 48 of the projection plane are set to the projection plane reference. Point. The projection plane correction section 17 compares the coordinates of the projection plane reference point 46 of the old drawing with the coordinates of the projection plane reference point 44 of the new drawing. Move the coordinates of each element end point within the projection plane area of
The reference points of the respective projection planes in both drawings are matched. This process,
Execute for all other projection planes. Next, in the different part comparison / detection processing unit (different part detecting means) 18, the projection planes of the new and old drawings are overlapped with each other by moving the elements in the respective projection plane areas of the old drawing. Out of the elements that are overlapped between the drawings, the elements (41 and 42, 4
9 and 50, and 51 and 52) are determined as elements that do not change. In addition, elements that overlap but do not coincide with one or both of the end points of the two elements (53 and 54, 55 and 5
6, 57 and 58) are determined as changed elements. Next, among the non-overlapping elements, elements 59 and 60 that exist only in the new drawing are determined as elements added to the new drawing. Also, an element 61 that exists only in the old drawing
Is determined to be a deleted element in the new drawing. Change part identification display part (identification display means) 19
Can be displayed on the screen in two ways: a changed part identification display of only the new drawing and a changed part combined display of the new and old drawings. These methods are selected by the operator when the function menu is selected by the function menu selection processing unit 13. In the changed part 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 the screen. In addition, in the changed part combined display of the new and old drawings, the two drawings are displayed in a superimposed manner as follows. That is, in FIG. 6, the elements 64 existing only in the old drawing are displayed in a display color distinguished from the others at low luminance. Elements 65 that are not changed in the new drawing are displayed in a display color that is distinguished from the others at standard luminance. Furthermore, the element 66 changed in the new drawing and the element 6 added in the new drawing
7 is displayed at a high luminance in a display color distinguished from others. As described above, the changed element, the added element, and the deleted element are distinguished and displayed on the screen by changing the display color and the display luminance. As described above in detail, according to the present invention , the drawing data of the old drawing for the new drawing displayed on the screen is searched from the drawing data file, and both of them are searched.
New and old drawings with predetermined dividing lines based on drawing data
Divide the elements of the surface, and the lines of the new and old drawings in each divided area
Elements with the same length (or perimeter) and the relative positions of the endpoints
End point of the same element as a reference point for new and old drawings.
As well as the standard for new and old version drawings for each divided area.
The location of each element endpoint in the new and old version drawings so that the points match.
By moving the mark to correct the relative position and displaying it on the same screen, the new drawing and the old drawing will be displayed on the same screen, with the exception of the design changes, overlapping Therefore, a non-overlapping portion can be easily identified as a design change portion, and the trouble of manually adjusting the projection plane for checking the changed portion is released. Each element end of the new and old drawings whose position has been corrected
By comparing the coordinates of the points, the difference between the new drawing and the old drawing is detected, and the difference is identified and displayed on the screen. Since different portions such as portions can be displayed on the screen separately from portions that do not change, it is easy to find design change portions even in complicated drawings, and it is possible to prevent design change portions from being overlooked.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a functional block diagram showing an embodiment of a drawing display method 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. [Description of Signs] 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 Different part comparison detection processing unit 19 Changed part identification display unit

Claims (1)

(57) [Claims 1] A drawing data file for storing each drawing data of a new version drawing and an old version drawing thereof is provided, based on the drawing data stored in the drawing data file. A drawing display method in a CAD system for displaying a drawing on a screen by using a drawing means for searching drawing data of an old version drawing for a new version drawing displayed on a screen from the drawing data file; It is determined in advance based on the drawing data and the drawing data of the old version drawing searched by the searching means.
The elements of the new / old version drawing are divided by the dividing line
Line length or perimeter and end point of new / old version drawing for each area
Extracts elements with the same relative position,
A reference point detecting means for setting a point as a reference point of the new / old version drawing, and a reference point of the new / old version drawing for each of the divided areas.
The coordinates of the end points of each element in the new and old version drawings so that
And position correcting means for moving the new-old number view after position correction by said position correction means
New version drawing and old version by comparing the coordinates of each element end point of the surface
A difference unit detection means for detecting the difference of the number of drawings to identify the differences portion detected by said difference-detecting means
A drawing display method in a CAD system, comprising: an identification display means for displaying the image on a screen .