JPH04199367A - Parametric design cad system - Google Patents

Abstract

PURPOSE:To easily generate an analogous drawing by generating the analogous drawing of a CAD drawing by changing the coordinate value of a designated and inputted related element among picture elements to constitute the CAD drawing on the basis of a size element and a size changing condition. CONSTITUTION:An input means 16 to designate and input the size element and the size changing condition to be an object of parametrization in the CAD drawing and a pattern element related to the change of size as a related element, and an analogous drawing generating means 21 to change the coordinate value of the related element designated and inputted by the input means 16 among the drawing elements to constitute the CAD drawing on the basis of the size element and the size changing condition, and generate the analogous drawing are provided. Accordingly, the coordinate data of the related element is changed by the analogous drawing generating means 21 in conformity to the size element and the size changing condition, and the analogous drawing is generated. Thus, it becomes unnecessary to generate the analogous drawing from the beginning by using pattern defining language, and the analogous drawing is easily generated from the existing CAD drawing.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention is a method suitable for creating similar drawings using already created CAD drawings (lametric design CAD). Regarding the system.

(Prior Art) Conventionally, a method of creating similar drawings by parametric design using a CAD system has been known. The conventional method for creating such similar drawings is CA
This was done by using the D system's movement and modification functions (for graphic elements) or graphic definition functions.

(Problem to be solved by the invention) However, the method of creating similar drawings using the movement and modification functions of the CAD system requires extremely complicated operations.
There was a problem that the drawing creation efficiency was low. In addition, the method using the figure definition function has a problem in that the shapes that can be made parametric (shapes that can be created as similar drawings are limited and the degree of freedom is poor).

This invention was made in view of the above circumstances, and its purpose is to easily create similar drawings without using a drawing definition language by simply specifying some of the graphical elements that constitute a desired existing CAD drawing. Our objective is to provide a parametric design CAD system.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a dimensional element to be parametrized in a desired CAD drawing, a condition for changing the dimension thereof, and a graphical element related to changing the dimension of the dimensional element. an input means for specifying and inputting the related element as a related element, and changing the coordinate values of the related element specified and input by the input means among the drawing elements constituting the CAD drawing, based on the above-mentioned dimension element and dimension change conditions. The present invention is characterized in that it is provided with a similar drawing creation means for creating similar drawings using the same method.

(Operation) According to the above configuration, the dimensional element to be parametrized (dimensional element to be parametrized) and the graphical element (related element) affected by this parametricization are specified in a desired existing CAD drawing. In order to specify the dimension change conditions (for example, the dimension value after change, the direction of dimension change) of the dimension element to be parametrized, the coordinate data of the above-mentioned related elements must be changed by a similar drawing creation means according to the dimension element and the dimension change conditions. Similar drawings will be created.

Therefore, it is possible to create similar drawings even for drawings to which the movement and modification functions of the CAD system or the figure definition language cannot be applied, and there is no need to spend a lot of time programming with the figure definition language ( Become.

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

Figure 1 shows the block configuration of the parametric design CAD system, where IO is a drawing database that stores various data on CAD drawings (drawings created with CA and D systems), and 11 is a storage for various programs and data. This is the main memory used for etc. In the main memory 11,
A CAD drawing (CAD drawing data) to be processed is read from the drawing data database 10 and stored. 12 is a display monitor used for displaying CAD drawings to be processed;
Reference numeral 3 denotes a display control unit that displays CAD drawings on the display monitor 12, messages for interaction with the user, and the like. 14 is a keyboard having various character keys, function keys, etc.; 15 is a mouse as a pointing device; 16 is a keyboard unit having the keyboard 14 and mouse 15; and 17 is a man-machine interface. The man-machine interface 17 accepts input from the keyboard unit 16 and also controls the display control unit 13 according to the input contents in order to enable interaction with the user via the display screen on the display monitor 12. It is supposed to be done.

Reference numeral 18 denotes an input information memory used to hold various kinds of designation information, which will be described later, input from the keyboard unit 1B in order to create a similar drawing based on the CAD drawing;
Reference numeral 9 denotes a table memory for converting drawing data used to create similar drawings from CAD drawings (original drawings). In the table memory 19, as shown in FIG. 2, a coordinate table T1 and a management table T2 for managing the coordinate table T1 are generated. The coordinate table T1 stores the x, y coordinates of the end points of each graphical element constituting the original drawing and the x, y coordinates of the endpoint of each graphical element constituting the similar drawing, forming pairs for each corresponding endpoint. Entry Ei for setting
(i=1.2・). On the other hand, the management table T2 is
A pointer (pointer information) that specifies the entry Ei in the coordinate table T1 in which the coordinate data of the end point is set for each graphical element constituting the original drawing, and whether the coordinate of the end point affects the creation of a similar drawing. It has an entry for setting a pair of change instruction flags Fx, . 20 creates a coordinate table T1 and a management table T2 as shown in FIG. The data is set by the similar drawing creation unit 21 described below.) The conversion table creation unit 21 is a conversion table creation unit 21 that uses the end points of each graphical element constituting the similar drawing based on the contents of the table memory 19 and the input information memory 18. This is a similar drawing creation unit that generates coordinate data and creates similar drawings.

FIG. 3 is a flowchart showing a similar drawing creation processing procedure in the system of FIG. 1.

FIG. 4 is a diagram for explaining the outline of the process of creating a similar drawing from an existing CAD drawing.

Next, the operation of similar drawing creation processing in the system shown in FIG. 1 will be explained with reference to FIGS. 1 to 4 as appropriate.

It is now assumed that a CAD drawing to be processed that has been read out from the drawing database 10 into the main memory 11 is being displayed on the display monitor 12 (under the control of the display control section 13) and is in a similar drawing creation mode. This mode is set by the operator operating the keyboard unit 16 and inputting, for example, a similar drawing creation command. It is assumed that the CAD drawing to be processed has six graphical elements (line segments) a to f, as shown in FIG. 4(a). Graphic element a has end points (starting point 7 end point) Pl, , P2, and graphic element a has end point P
2°P3, and the graphic element C is at the end point P3. P4, and the graphic element d is the end point P4. P5, graphic element e has end points P5, P6, and graphic element f has end points P6. Each has a PI.

Here, the operator operates the mouse 15 of the keyboard unit 16 while looking at the display screen of the display monitor 12 to
When you specify and input the dimension change condition consisting of the dimension element A that you want to parametrize in the AD drawing (the dimension element to be parametrized), the dimension value after the change, and the direction of dimension change (in this case, the positive direction of X), the specified contents will be changed. Received by the man-machine interface 17 (step Sl)
. The specified contents accepted by the man-machine interface 17 are written into the input information memory 18 via the conversion table creation section 20.

Next, the operator uses the mouse 15 again to use the graphical element (
related elements).

There are three types of related elements. The first related element is / (a reference graphical element that has a common end point with the graphical element corresponding to the dimensional element A to be converted into ramometrics, and is not affected at all even if the same graphical element changes its shape due to a change in dimension value (hereinafter referred to as , referred to as type 1 related elements), and in the example of Fig. 4, the same figure (
This is the graphic element f with a mouth seal attached in (b). The second related element is a graphical element that moves in the direction of change in dimension value (hereinafter referred to as type 2 related element), and in the example in Figure 4, it is a graphical element marked with an O in the same figure (b). It is an element. The third related element is a graphic element whose dimension value changes (shape changes) (hereinafter referred to as type 3 related element), and in the example of Fig. 4, the Δ mark in the figure (b) is Attached graphical element a.

It is C. Keyboard unit 1 is activated by the operator's operation.
The specified contents of the related elements input from 6 are accepted by the man-machine interface 17 (step S2),
It is written into the input information memory 18 via the conversion table creation section 20. Note that the table memory 19 (coordinate tables Tl, T2 therein) is "
0 “Cleared.

When the conversion table creation unit 20 completes the above reception,
One graphic element (data) is extracted from the data of the CAD drawing to be processed, that is, the original drawing, which is the basis for creating a similar figure stored in the main memory 11, and written into the table memory 19 (step S3). Here, data (coordinate data P1x, P1y and P2x, P2y) of graphic element a having endpoints Pi and P2 are first taken out and written into the table memory 19 as shown in FIG. 2. That is, the starting point coordinate data PLX, PIy of graphic element a is written to the original figure coordinate data field of the E1 entry of the coordinate table T1 in the table memory 19, and the end point coordinate data P2X, P2y of graphic element a are written as the coordinates. Table T1
is written to the E2 entry of Also table memory 19
El and E2 are written in the start point 1 end point data pointer field of the first entry of the internal management table.

When the conversion table creation unit 20 executes the graphic element writing in step S3 (here, the writing of the graphic element a), the conversion table creation unit 20 determines whether the element (a) is a related element or not in the input information memory 18.
Check based on the contents (specified information of related elements) (
Step S4). If it is a related element like graphic element a in this example, the conversion table creation unit 20 checks whether it is the same element or one of types 1 to 3 (steps S5 and 6). In the case of a type 3 related element like graphic element a (graphic element marked with Δ in Figure 4 (b)),
The conversion table creation unit 20 checks whether the element (a) corresponds to the dimension element A to be parametrized.
(step 37). When the graphic element a corresponds to the target dimension element A, the conversion table creation unit 20 converts each pair of change instruction flags FX on the start point side and the end point side assigned to the graphic element a in the management table T2. , Fy, a change instruction corresponding to the direction of change (X direction) on the end point (P2) side that is not common with the standard type 1 related element (graphic element f marked with a seal in Figure 4 (b)) Turn on the flag (here, the end point side change instruction flag Fx) (step S
8).

When the conversion table creation unit 20 executes step S8,
Check whether it is the last element of the original diagram (step S9
), if it is not the last element, the next element, graphic element a, is taken out from the original diagram on the main memory 11 and written to the table memory 19 in the same manner as in the case of the graphic element a described above (step S3 ).

This graphic element is a type 2 related element marked with an O mark in FIG. 4(b). In this case, the conversion table creation unit 20
Steps 84 to S6 are red and the process proceeds to step S10, where the direction of change (X direction) is selected among each pair of change instruction flags Fx and Fy on the start point side and end point side assigned to the graphic element in the management table T2. The change instruction flag corresponding to , that is, both the change instruction flags FX on the starting point side and the ending point side are turned on (step 510).

After the variable tli table creation unit 20 executes step S10, the process returns to step S9, and since the graphic element is not the last element, the process returns to step S3.

The conversion table creation unit 20 extracts the next graphical element C from the original diagram on the main memory 11 and writes it into the table memory 19 in step S3. This graphical element C is either a type 3 related element like the above-described graphical element a, or it does not correspond to the dimension element A to be parametrized. In this case, the conversion table creation unit 20 proceeds to step Sll through steps 84 to S7, and selects one of each pair of change instruction flags Fx, Fy on the start point side and end point side assigned to the graphic element C in the management table T2. , turn on the change instruction flag corresponding to the end point side change direction (X direction) common to type 2 related elements, that is, the start point (P3) side change instruction flag FX (
Step 511).

When the conversion table creation unit 20 executes step Sll, the process returns to step S9, and since the graphical element C is not the last element, the process further returns to step S3.

The conversion table creation unit 20 extracts the next graphical element d from the original diagram on the main memory 11 in step S3, and writes it into the table memory 19. This graphical element d is not a related element. In this case, the conversion table creation unit 2° performs step S4.
(without performing any operation on the change instruction flag assigned to the graphic element d in the management table T2), proceed directly to the final element determination step S9, and then proceed to step S9.
Return to step 3 and take out the next graphical element e and table memory 1
Write to 9. Since this graphical element e is also not a related element, step S4. After S9, the next graphic element f is taken out and written into the table memory 19 (step S3). This graphical element f is a type] related element. In this case, the conversion table creation unit 20 performs step S4. From S5 (without performing any operation on the change instruction flag assigned to graphic element f in management table T2)
The process directly advances to final element determination step S9. At this time,
The management table T2 in the table memory 19 is in a state as shown in FIG.

Graphic element f is the last element of the original diagram. Therefore, the determination in step S9 is YES. In this case, the conversion table creation unit 20 passes control to the similar drawing creation unit 21. The similar drawing creation unit 21 first calculates the amount of movement (amount of change) ΔX or Δy of the dimensions from the dimension change conditions written in the input information memory 18 (step 512). Here, the dimension value A shown in FIG. 4 (A) is changed by moving the end point P2 of the corresponding graphic element a in the positive direction of X as shown in P' 2 shown in FIG. 4 (C). If the change is made as shown in B, in step 512 it is determined whether the value is positive ΔX (P2
If is moved in the negative direction of X, the value of ΔX will be negative).

When the similar drawing creation unit 21 calculates the movement amount in step S12, it calculates the end point coordinate values of each figure element of the original drawing written in the table memory 19 (internal coordinate table TI).
The amount of movement is added to the coordinate value of the end point whose corresponding change instruction flag is turned on in the management table memory, and the result is written in the similar drawing coordinate data field of the corresponding entry in the coordinate table T (step 813). Here, as is clear from the contents of the management table T2 in the table memory 19 shown in FIG. Each X coordinate value P of P3
The calculated movement amount ΔX is added to 2x, P3X, and the point P'2. after movement (dimensional change) is obtained. X coordinate value P of P'3
' 2X, P' 3X are calculated. Point P′2゜P
'3's X coordinate value and other points PL, P4-Phi's X.

The X coordinate value is the same as the original figure.

When the similar drawing creation unit 21 executes step 813 and completes the coordinate table T1 in the table memory 19 as shown in FIG. 4. A graphic element sequence of a different similar drawing shown in FIG. 4(c) is registered in the drawing data database 10 (step 514). This ends the series of similar drawing creation processes.

In addition, in the above embodiment, the dimension change direction or the X direction (horizontal)
Although the case has been described above, it is of course possible to perform the same operation in the y direction (vertical direction). Also, for changes in the diagonal direction by 1 method, the dimension values after the change and 1. The X component,
It can be applied by providing each X component. In this case, for type 2 related elements, the change instruction flags Fx and Fy at both end points are turned on, and for type 3 related elements, the change instruction flags Fx and Fy at one end point are turned on.
Fy is turned on.

In addition, in the above embodiment, the input information memory 18 and the table memory 19 are provided separately from the main memory 11 (7), but they may be provided in a specific area on the main memory 11. .

[Effects of the Invention] As described in detail above, according to the present invention, if a dimensional element to be parametrized, its dimensional change conditions, and graphical elements related thereto are specified in an existing CAD drawing (original drawing), It is possible to create a drawing similar to the original drawing (similar drawing) by changing the coordinate values of related graphic elements based on the original drawing. That is, according to the present invention, it is not necessary to create similar drawings from the beginning using a figure definition language as in the past, similar drawings can be easily created from existing CAD drawings, and the CAD system has It is now possible to create similar drawings for drawings that could not be created with conventional methods that use the move, modify, or figure definition functions, and has the excellent effect of eliminating the need for programming using a figure definition language. be able to. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a parametric design CAD system according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of the structure of the table memory 19 shown in FIG. 1, and FIG. 3 is a diagram showing the system of FIG. 1. FIG. 4 is a flowchart showing the similar drawing creation processing procedure in , and is a diagram for explaining the outline of the process of creating a similar drawing from an existing CAD drawing. IO drawing data storage, 11...Main memory, 12...Display monitor, 16...Keyboard unit, 15...Mouse, 17...Man-machine interface, 18...-
Human power information memory, 19. Table memory, 20. Conversion table creation section, 21. Similar drawing creation section, T1. Coordinate table, T2. Management table. Applicant's agent Patent attorney Takehiko Suzue Figure 3 (Part 1) Figure 3 (Part 2)

Claims (1)

[Scope of Claims] An input means for specifying and inputting a dimensional element to be parametrized in a desired CAD drawing, its dimensional change conditions, and a graphical element related to the dimensional change of the dimensional element as a related element. , among the drawing elements constituting the CAD drawing, the coordinate values of the related elements designated and input by the input means are changed based on the dimension elements and dimension change conditions to create a drawing similar to the CAD drawing. A parametric design CAD comprising: a similar drawing creation means; and a parametric design CAD.
system.