JPH09319783A - Hidden line processing method for parametric graphic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the shape defining manhour in a line width processing mode where a thick line is changed to a medium or thin line, etc., by turning data made into the variable into an integrated variable in every shape that undergoes the collective hidden line processing for the parts, areas, etc. SOLUTION: When a designer selects a standard/broken line display pattern out of a display pattern menu, the hidden line processing is carried out to turn a head part A, a shaft part B and a screw part C into broken lines. When a head part/solid line display pattern is selected, the hidden line processing is carried out to display only the part A and not to display other parts B and C. In screw part/broken line display pattern, the hidden line processing is carried out to show the part A in a solid line and the parts B and C in broken lines respectively. Thus, the line type of a certain part can be changed for the hidden line processing of only the part just by selecting the no display, the broken line, etc., as the display form of the part. As a result, the change processing jobs can be omitted in such cases where plural entire graphics having the same shape and partly different line types are sequentially defined or a graphic once defined is partly deleted, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hidden line processing method suitable for a computer aided design (CAD) system for parametric figures in which the dimensions of each figure are made variable.

[0002]

2. Description of the Related Art As a conventional parametric figure processing method, one shown in FIG. 6 is known, and in this method, one component (bolt in this example) is dealt with as shown on the right side of the figure. While providing a data file, create a figure to parametricize the part as shown on the left side of the figure, that is, a figure to make the dimensions of each part variable etc., and set each dimension variable of the shape of the figure and each of the data file. By linking variables with an interface program as shown in the center of the figure, the shape is changed to the dimensions corresponding to the variables stored in the data file.

[0003]

However, in the conventional parametric figure processing method described above, although it is possible to make a plurality of data files correspond to one shape, a plurality of data files can be made to correspond to one data file. It is not possible to correspond the shape and multiple line types. Therefore, if you want to partially change the presence or absence of the display and the line type for hidden line processing, exemplify three types of bolts in Fig. 7. As shown in the above, it is necessary to successively define the entire figure with the same shape and partially different line types, or to delete part of the figure once defined and change the line type to broken lines or thin lines. Therefore, there is a problem that the number of man-hours for defining the shape increases.

By the way, the definition format of shape data is generally as follows in the case of a figure drawn by n / 2 three-dimensional straight lines.

X ₁ , y ₁ , z ₁ , 1 x ₂ , y ₂ , z ₂ , 0, line type, line width, presence / absence of display, etc .... x _n-1 , y _n-1 , z _{n -1} , 1,1 x _n , y _n , z _n , 0, line type, line width, display presence, other

[0005] In this _{case, x 1 ~x n, y 1} ~y n, z 1 ~
z _n is the coordinate value of the end point of the straight line, and 1, 0 indicates whether the end point is the start point or the end point, respectively. In the conventional parametric figure processing method, the coordinate value of these data is changed to a variable. Although the dimension was made variable by making it into a variable, it was possible to make the line type, the line width, the presence or absence of display, etc. variable in addition to the coordinate value in a place studied by the inventor of the present application.

In view of the above points, the present invention solves the above-mentioned problems of the prior art by making variable data into unified variables for each shape such as parts and parts to be hidden line processed collectively. The purpose is to do.

[0007]

[Means for Solving the Problems] To achieve the above object,
The hidden line processing method for parametric figures according to the present invention is
When performing the hidden line processing on the parametric figure representing the predetermined object by the D system, the parametric figure representing the predetermined object is decomposed into a plurality of partial figure units representing the shape to be subjected to the hidden line processing collectively, and for each partial figure, A plurality of types of display forms including at least presence / absence of display and a plurality of types of line types are determined, and the parametric figure representing the predetermined object is defined by the CA.
When displaying by the D system, a display form for each of the partial graphics is selected from the plurality of types of display forms, and the plurality of partial graphics in the selected display form are combined and displayed.

According to the hidden line processing method of the present invention described above, a parametric figure representing a predetermined object is decomposed into a plurality of partial figure units each representing a shape to be subjected to the hidden line processing in batch, and at least display presence / absence of each partial figure and Since a plurality of types of display forms including a plurality of types of lines are defined, and when displaying a parametric figure, a plurality of partial figures in a display form selected from the plurality of types of display forms are combined and displayed. When you want to change the line type of the part for hidden line processing only for the part, you only have to select no display or broken line etc. as the display mode of the part. Therefore, the figure with the same shape but partially different line type It is possible to eliminate the work of sequentially defining the whole of the shape, changing part of the shape once defined, and changing the part of the line type such as broken lines. It can be reduced.

In the method of the present invention, the parametric figure representing the predetermined object is divided into a plurality of partial figure units each representing a shape to be subjected to hidden line processing, and a plurality of types of display forms are determined for each partial figure. At the same time, the designer decomposes the parametric figure into the partial figure units, determines a plurality of types of display patterns corresponding to the predetermined object, and for each of these display patterns, When a pattern flag indicating a display form is determined, the partial figure, the display pattern and the pattern flag are registered in the CAD system, and when the parametric figure representing the predetermined object is displayed by the CAD system, first, the plurality of types of the plurality of types are displayed. The designer selects one display pattern from the menu showing the display pattern, and then the CAD The stem selects and generates a pattern flag for each of the plurality of partial graphics corresponding to the selected display pattern from the registered pattern flags, and these pattern flags are generated with each pattern flag. Using the pattern flag analysis file stored in association with the display forms shown, the display form data is returned to the respective display forms, and the plurality of partial figures in the display forms based on the data are combined and displayed. good.

With this configuration, when the parametric figure is displayed by the CAD system, the designer can select one display pattern from a menu showing a plurality of types of display patterns, and the CAD system can correspond to the display pattern. Since the hidden line processing can be performed, the number of steps for defining the shape can be further reduced.

Further, in the method of the present invention, the designer defines a plurality of types of dimensional patterns for the combination of the respective dimensions of the parametric figure representing the predetermined object, and the CA is set.
When the designer selects one display pattern from the menu showing the plurality of types of display patterns, the designer also selects one size pattern from the menu showing the plurality of types of dimension patterns. When the CAD system selects and displays the plurality of partial graphics in combination, the respective dimensions of the combination of the combinations corresponding to the selected dimension pattern may be displayed.

By doing so, it is possible to reduce the man-hours for defining the dimensions as well as the man-hours for defining the shapes.

Further, in the method of the present invention, the plural types of display forms may include plural types of line widths.

By doing so, it is possible to reduce the man-hours for defining the shape when changing the line width of a part or all of the parametric figure from a thick line to a medium line or a thin line.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a flow chart showing an implementation procedure of an embodiment of a parametric figure hidden line processing method of the present invention. This embodiment is a part of a program executed by the central processing unit in a normal CAD system. It is carried out by modifying the
Then, the designer defines a figure representing the shape of the bolt as the predetermined object as shown in FIG. 2 using the CAD system.

The contents of the definition of this bolt graphic are converted into text as follows.

## EQU00002 ## 1. Shape x ₁ , y ₁ , z ₁ , 1 x ₂ , y ₂ , z ₂ , 0, line type, line width, presence / absence of display, and others x ₉ , y ₉ , z ₉ , 1 x ₁₀ , y ₁₀ , z ₁₀ , 0, line type, line width, display presence, other ・ ・ ・ x ₉ , y ₉ , z ₉ , 1 x ₁ , y ₁ , z ₁ , 0, line type, line width, display Existence, other 2. Dimension line 3. Mark other

Next, in step 2 of FIG. 1, the defined figure is divided into a plurality of sub-figure units such as parts and parts to be hidden line processed collectively, that is, the head in this embodiment, as shown in FIG. The part A, the shaft part B, and the screw part C are disassembled. This decomposition is performed by the designer instructing the range of each partial figure to the CAD system using, for example, a mask. Then, like the above-mentioned head, shaft, and screw, the designer assigns a part name to each decomposed partial figure and registers it in the CAD system.

As a result, the CAD system automatically decomposes the shape data in the previous text-converted data as follows and aligns and re-describes for each partial figure.

Equation 3] 1. shape head _{x 1, y 1, z 1} , 1 x 2, y 2, z 2, 0, S1, T1, U1, other _{x 2, y 2, z 2} , 1 x 10, _{y 10, z 10, 0,} S1, T1, U1, other _{x 9, y 9, z 9} , 1 x 10, y 10, z 10, 0, S1, T1, U1, other x _9, y _9, z ₉ , 1 x ₁ , y ₁ , z ₁ , 0, S1, T1, U1, other shafts x ₃ , y ₃ , z ₃ , 1 x ₄ , y ₄ , z ₄ , 0, S2, T2, U2, Others ・ ・ ・ Screw parts x ₄ , y ₄ , z ₄ , 1 x ₅ , y ₅ , z ₅ , 0, S3, T3, U3, etc.

Here, S1, T1, and U1 are variables that uniformly indicate the line type, line width, and presence / absence of display of a plurality of straight lines forming the head A, and S2, T2, and U2 are axes B. Variables that uniformly indicate the line types, line widths, and presence / absence of the multiple straight lines that make up, and S3, T3, and U3 are the line types, line widths, and presence / absence of lines of the multiple straight lines that make up the screw part C. In this embodiment, variables that represent the display styles of line type, line width, and non-display are unified for each part name and, thus, for each partial figure. This makes it easy to change the display format.

Then, in step 3 of FIG. 1, pattern flags are set for each of the plurality of line types, the plurality of line widths, and the non-display display form, and as shown in FIG.
A pattern flag analysis file that associates the display forms with the pattern flags is created on the CAD system.

Further, here, in step 4 of FIG.
As described above, the CAD system includes a bolt menu listing a plurality of bolt types, a size menu listing a plurality of bolt sizes (nominal diameters), and a display pattern menu listing a plurality of bolt display patterns. Created above, the contents of each type of each menu are defined, and they are registered in the CAD system.
Here, for the size menu, each part size corresponding to each size is registered as shown on the right side of FIG. 6, and for the display pattern menu, each display pattern is shown as shown on the right side of FIG. The pattern flag of each part corresponding to is determined and registered.

That is, for example, the pattern flags for the standard / solid line display patterns are all 1 (line type is solid line) F (line width is thick line) for the head A, shaft part B, and screw part C, and standard / broken line. Although not shown, the pattern flag corresponding to the display pattern is head A, shaft B, screw C
All are set to -1 (line type is a broken line) F (line width is a thick line), and a pattern flag for a display pattern of head / solid line is not shown, but the head A is set to 1 (line type is a solid line) F.
(The line width is a thick line), the shaft portion B and the screw portion C are set to 0 (not shown), and the pattern flag for the display pattern of the screw portion / broken line is not shown, but the head A
Is 1 (line type is a solid line) F (line width is a thick line), and the shaft portion B and the screw portion C are -1 (line type is a broken line) F (line width is a thick line).

In this embodiment, for simplification of the processing, each size in the size menu corresponds to only one kind of part size, but for each size, for example, a plurality of types of shaft lengths may be set. It is also possible to set a plurality of types of dimensions such as determining a plurality of types of screw lengths so that they can be selected on the menu. By doing so, it is possible to reduce the man-hours for defining the dimensions as well as the man-hours for defining the shapes.

After the above work is completed, when displaying the bolt figure as a parametric figure on the CAD system, here, in step 5 of FIG. 1, the CA is displayed.
Display each of the above menus on the D system,
The designer selects contents from each menu and instructs the selected contents to the CAD system by, for example, a pick operation using a mouse.

In response to the selection instruction from this menu, the CAD system displays the bolt graphic on the screen based on the contents selected for each menu in step 6 of FIG. 1, and at this time, for the display pattern menu. A pattern flag indicating the line type, line width, and presence / absence of display corresponding to the selected content is generated based on the definition of the above display pattern menu, and those pattern flags are displayed using the pattern flag analysis file. It is converted into form data, and the figure of the bolt is displayed with hidden line processing depending on the selected content based on the data.

That is, in the CAD system, when the designer selects the standard / broken line display pattern from the display pattern menu, the head, the shaft and the screw part are all made into a broken line process, If the designer selects the head / solid line display pattern from the display pattern menu, the hidden line processing is performed so that only the bolt head is displayed and the shaft and screw are hidden. When the screw pattern / broken line display pattern is selected in the display pattern menu, a hidden line process is performed in which the bolt head is displayed as a solid line and the shaft portion and the screw portion are displayed as dashed lines.

Therefore, according to the method of this embodiment, when it is desired to change the line type of a part for hidden line processing of only a part, it suffices to select no display or a broken line as the display mode of the part. Therefore, it is not necessary to successively define the whole figure with the same shape but partially different line types, or to perform a modification process such as deleting a part of the figure once defined or making some line types dashed. Therefore, the number of man-hours for shape definition can be reduced.

Moreover, in the method of this embodiment, the designer
A plurality of types of display patterns corresponding to the bolts are defined, and for each of those display patterns, a pattern flag indicating the display form of each of the partial figures of the head, the shaft and the screw is defined, and the partial figures are The display pattern and the pattern flag are registered in the CAD system, and when the parametric figure representing the bolt is displayed by the CAD system, the designer selects one display pattern from the menu showing the plurality of types of display patterns.
The CAD system selectively generates pattern flags corresponding to the selected display pattern for each of the partial figures of the head, shaft, and screw, and uses the pattern flags analysis file to generate these pattern flags. It returns to the data of each display form, and the partial graphic of the head, the shaft, and the screw part in the display form based on the data is combined and displayed. Therefore, when the bolt graphic is displayed by the CAD system, the designer , By selecting one display pattern from the menu showing multiple types of display patterns,
The CAD system can be made to perform hidden line processing corresponding to the display pattern, and therefore the number of man-hours for shape definition can be further reduced.

Further, in the method of this embodiment, since a plurality of types of line widths are included in a plurality of types of display forms, a line from a thick line to a middle line, a thin line or the like for a part or all of the bolt graphic is displayed. It is also possible to reduce the man-hours for defining the shape when performing the width changing process.

Although the present invention has been described above based on the illustrated example, the present invention is not limited to the above example. For example, in the above example, a plurality of parts of bolts as predetermined objects are divided into partial figures, A plurality of parts of an apparatus formed by combining a plurality of parts may be divided as a partial graphic.

[Brief description of drawings]

FIG. 1 is a flowchart showing an implementation procedure of an embodiment of a hidden line processing method for a parametric figure according to the present invention.

FIG. 2 is an explanatory diagram showing a method of defining a bolt figure in the above embodiment.

FIG. 3 is an explanatory diagram showing a method of dividing a bolt figure in the above embodiment.

FIG. 4 is an explanatory diagram showing an example of a pattern flag analysis file in the above embodiment.

FIG. 5 is an explanatory diagram showing an example of various menus in the above embodiment.

FIG. 6 is an explanatory diagram showing a conventional parametric figure processing method.

FIG. 7 is an explanatory diagram showing a hidden line processing method in the conventional processing method.

[Explanation of symbols]

 A head part B shaft part C screw part

Claims (4)

[Claims] 1. When performing a hidden line processing on a parametric figure representing a predetermined object by a CAD system, the parametric figure representing the predetermined object is decomposed into a plurality of partial figure units each representing a shape to be hidden line processed collectively, For each partial figure, a plurality of types of display forms including at least the presence / absence of display and a plurality of types of line types are determined, and when the parametric figure representing the predetermined object is displayed by the CAD system, the plurality of display forms for each partial figure are displayed. A hidden line processing method for a parametric figure, characterized by selecting from a variety of display modes and displaying the plurality of partial graphics in the selected display mode in combination. 2. A parametric figure representing the predetermined object is decomposed into a plurality of partial figure units each representing a shape to be subjected to hidden line processing collectively, and when a plurality of types of display forms are defined for each of the partial figures, the designer: A pattern flag that decomposes the parametric figure into the partial figure units, determines a plurality of types of display patterns corresponding to the predetermined object, and indicates the display form of each of the plurality of partial figures for each of the display patterns. , The partial figure, the display pattern and the pattern flag are registered in the CAD system, and when a parametric figure representing the predetermined object is displayed by the CAD system, first, from the menu showing the plurality of types of display patterns. The designer selects one display pattern and then the CAD system is registered A pattern flag corresponding to the selected display pattern among the pattern flags is selected and generated for each of the plurality of partial graphics, and these pattern flags correspond to each pattern flag and the display form indicated by the pattern flag. 2. The pattern flag analysis file which is stored by being restored to each of the display form data, and the plurality of partial figures in the display form based on the data are displayed in combination. Method for Hidden Lines of Parametric Shapes of the. 3. A designer defines a plurality of types of dimension patterns for combinations of dimensions of respective parts of a parametric figure representing the predetermined object, registers them in the CAD system, and designs from a menu showing the plurality of types of display patterns. When the designer selects one display pattern, the designer also selects one size pattern from the menu indicating the plurality of types of size patterns, and the CAD system displays the plurality of partial figures in combination. In addition, it is characterized in that it is displayed with each part size of the combination corresponding to the selected size pattern,
The method for processing hidden lines of a parametric figure according to claim 2. 4. The hidden line processing method for a parametric figure according to claim 1, wherein the plurality of types of display forms include a plurality of types of line widths.