JPH07296023A - Dimension drawing method in CAD system - Google Patents

Abstract

(57) [Summary] [Purpose] During dimension drawing, the operator does not have to be aware of the dimension design rule and, in response to input from the input device, successively selects the optimum dimension line and dimension value based on this design rule. The display position is automatically determined, dimension drawing candidates are displayed on the screen, and dimension drawing operations can be performed based on the display candidates. [Configuration] From the current cursor position, the dimension and shape generation unit 1
A virtual dimension shape is generated at 12, and a figure, dimension data, and the like that influence the determination of the dimension drawing position are searched from the drawing data 103 using the data search / registration unit 117. The design rule data is also searched. afterwards,
Dimension line drawing position determination unit 11 based on the design rule data
3, the drawing position of the dimension line and the dimension value display position determination unit 1
The display position of the dimension value is obtained at 14, and the dimension candidate display unit 1
At 15, the image is displayed on the display device 102 using the input / output control unit 111.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimension drawing method in a CAD system, and in particular, it produces an optimum dimension line and dimension value sequentially according to an input from an input device such as a mouse when dimensioning. The present invention relates to a dimension drawing method in a CAD system in which a drawing candidate is displayed on a screen and a dimension drawing operation can be performed based on the displayed drawing candidate.

[0002]

2. Description of the Related Art Conventionally, in a CAD system, as a method of drawing a dimension, when inputting a position of a dimension line,
Use the coordinate correction function of the grid or electronic ruler, etc., and draw the dimension so that the dimensions are aligned at the grid grid point intervals or the electronic ruler scale intervals (match the grid points or the ruler scale position). When inputting the method and the position of the dimension line, specify the position to align by designating other dimension lines that have already been drawn, or directly specify the position to align with the coordinate value There are known a method of drawing a dimension while aligning, and a method of drawing a dimension at a rough position and then designing a dimension by specifying a position for aligning the dimension with an alignment command.

Regarding the dimension value display position, the dimension value display position is designated in advance before dimension drawing (for example, when there are several candidates for the dimension value display position, one of them is designated) and the image is drawn. A method and a method of changing the dimension value display position after dimension drawing are known.

[0004] It is general to draw the dimensions by aligning them according to a certain design rule, but in the conventional method,
At the time of inputting the dimension line position, etc., consideration was not given to the points of line drawing based on a certain design rule, and the point of drawing while confirming the dimension line and the dimension value.

Further, as described in Japanese Patent Application Laid-Open No. 62-187975 (Reference 1), a figure for drawing a dimension is designated by a region designation, etc., and the dimensions are collectively arranged according to a certain design rule. There is known an automatic dimension drawing method for performing the drawing.

[0006]

The above-mentioned conventional method of drawing a dimension by using the coordinate correction function of a grid, an electronic ruler or the like can not only perform the positioning at a constant interval but also draw the dimension line obliquely. When drawing, it is necessary to define a grid or electronic ruler that matches the angle of the dimension that is pulled out diagonally, and the point that automatically determines the appropriate design rule for alignment based on the dimension line to be drawn is not considered. For this reason, the operator has to draw the dimensions by defining or changing the grid or the electronic ruler while being aware of the dimension drawing design rule, which causes a problem of poor operability. Further, there is a problem that the display data increases due to the display of the grid and the electronic ruler.

In the above-mentioned prior art, when the position of the dimension line is input, the dimension drawing method of designating the position to be aligned by designating another dimension line which has already been drawn is based on the dimension drawing design rule. It is necessary to move the cursor to the position to be aligned with a pointing device such as a mouse while pointing, so that not only does the pointing device move a lot, but also when you enter the position of the dimension line, The point of designating the value display position is not taken into consideration, and an operation such as changing the dimensional value display position may occur after drawing a dimension, resulting in poor operability.

The method of aligning the dimensions after drawing the dimensions at the rough position in the above-mentioned prior art also has a problem that many operations are required and the operability is poor.

Further, in the prior art disclosed in the above-mentioned document 1,
In the automatic dimension drawing method in which the dimensions are collectively drawn, unnecessary dimensions may be drawn in some cases, and there is a problem that it is necessary to correct the unnecessary dimensions after the automatic dimension creation.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and at the time of dimension drawing, the operator does not have to pay attention to the design rule and inputs from the input device and the existing figures / dimensions. The optimum dimension line drawing position and dimension value display position can be automatically determined according to the data etc. so as to satisfy the design rule, and corrections such as deleting unnecessary dimensions after automatic dimension drawing It is to provide a dimension drawing method in a CAD system that does not require

[0011]

In order to achieve the above object, the present invention provides a sizing method in a CAD system having means for drawing a figure and means for drawing a dimension line and a dimension value on the drawn figure. A means for automatically determining the optimum dimension line drawing position based on certain design rules in response to other dimension lines that have already been drawn and input from an input device such as a mouse. According to the input, a means for sequentially displaying the drawing candidates of the optimum dimension line on the screen and performing the drawing operation of the dimension based on the display candidates are provided.

Further, means for automatically determining the display position of the optimum dimension value based on a certain design rule in accordance with the dimension line to be drawn and input from an input device such as a mouse,
During dimension drawing, a means for sequentially displaying the drawing candidates of the optimum dimension value on the screen in accordance with the input from the input device and performing the drawing operation of the dimension based on the display candidate is provided.

[0013]

The operation based on the above configuration will be described.

The dimensions to be drawn on the drawing are generally aligned and drawn according to a certain standard (design rule). According to the present invention, at the time of the dimension drawing operation, based on the design rule information defined in advance, information of other (existing) other dimension lines that have already been drawn or the dimension line to be drawn, and the mouse. According to the input from the input device such as, the drawing candidates of the optimum dimension line and the dimension value are sequentially calculated, and the drawing candidates are displayed on the screen.

During the size drawing operation, the optimum size aligned according to the design rule (according to a certain standard) can be drawn while confirming the drawing candidate display of the size on the screen. This allows the dimensions to be drawn quickly and easily. Further, after size drawing, correction operations such as movement and deletion can be minimized, and operability of size drawing can be improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a dimension drawing processing unit of a CAD system according to an embodiment of the present invention. In the figure, 101 is an input device such as a keyboard and pointing device, and 102 is a display device for displaying figures and dimensions. Reference numeral 103 is drawing data such as figures and dimensions, which is stored in a memory or a magnetic disk device. Further, reference numeral 104 denotes design rule data for drawing a dimension, which is data used as a criterion for determining the dimension line and the dimension value display position. This design rule data is, for example,
"When drawing a dimension from a figure, the distance from the figure that draws the position of the dimension line should be several millimeters or more, and basically the distance should be several millimeters.""When drawing a dimension from a dimension,
The distance between dimension lines is several millimeters. "Align the dimension lines so that they align horizontally or vertically."
The information is, for example, "dimension lines and dimension lines do not intersect as much as possible." In addition, the above-mentioned "in the case of drawing a dimension from a dimension" is a case of displaying two dimensions and a dimension of the sum of both dimensions. It also has information on the priority of judgments of various design rules. This design rule data 104
Are stored in a memory or a magnetic disk device.

The processing unit 110 for extracting the dimensions is a means for receiving the input data from the input device 101 and the display device 1.
02, and means for searching the drawing data 103 and the design rule data 104. The processing unit 110 includes an input / output control unit 111 that processes input / output data, and a size / shape generation unit 1 that calculates a size / shape based on the size drawing position.
12, a data search / registration unit 117 for searching / registering figures and dimension data in the drawing data 103, and the input device 1.
01 based on the information of the design rule data 104 according to the input from 01, and the information of the design rule data 104 according to the input from the input device 101 A display example of the dimension value display position determination unit 114 that determines the optimum dimension value display position based on the above, and the dimension (dimension line and dimension value) obtained by the dimension line drawing position determination unit 113 or the dimension value display position determination unit 114 Candidate display unit 115 for sequentially displaying the candidates of
And a dimension drawing unit 11 that displays the determined dimension on the display device 102 by inputting a dimension drawing determination instruction from the input device 101 and registers the dimension data in the drawing data 103.
6 and 6.

In particular, the storage unit for the design rule data 104, the dimension line drawing position determination unit 113, and the dimension value display position determination unit 114 have a configuration peculiar to the embodiment of the present invention.

2 and 3 are explanatory views for explaining an example in which the optimum drawing position of the dimension line is obtained according to the movement of the pointing device, that is, the movement of the cursor, and the candidate is displayed.

FIG. 2 is based on the positional relationship of other dimensions.
This is an example of obtaining the optimum drawing position of the dimension line and displaying the candidates. In general, the dimension line is drawn so that the dimension is aligned with other dimension lines having the same inclination in the same position in the same direction as possible. The numeral 20 in FIG. 2 is a figure for drawing out the dimension (the figure to be drawn for the dimension drawing).
Reference numeral 9 is a component of the graphic 20. Reference numeral 22 is another graphic (an already created graphic), the dimension 23 of which has already been extracted. The graphic 22 can be retrieved from the drawing data storage unit 103. 231 to 234 are components of the dimension 23, 231 and 232 are auxiliary dimension lines, 233 is a dimension line,
234 is a dimension value. Reference numeral 21 is a cursor indicating the input position of the pointing device.

Now, as shown in FIG.
Consider the case where the dimensions are drawn from the intersections of the elements 206 and 206 and the intersections of the elements 201 and 208. First, as shown in FIG. 6B, the position of the cursor 21 is brought to the approximate position where the dimension line is about to be displayed. Using the cursor position 21 as a reference, the dimension / shape generator 112 obtains the positions (coordinates) of the points 241 and 242, which are the positions at both ends of the virtual dimension line 24, and the inclination of the dimension line 24. It should be noted that the dimension lines include the dimension auxiliary lines 243 and 244. Next, based on the information of the design rule data 104, a search area 25 having an upper and lower width for searching for a figure or dimension data that influences the determination of the drawing position of the dimension line is created. The data existing in the search area 25 is extracted (searched) from the existing drawing data and dimension data stored in the drawing data storage unit 103. Next, from the extracted drawing / dimension data (drawing / dimension data existing in the area 25), in the dimension line drawing position determination unit 113, based on the information of the design rule data 104, the dimension lines have the same inclination and are dimensioned. The dimension 23 at which the lines do not intersect is searched, and the drawing position of the dimension line is determined. Similarly, in the dimension value display position determination unit 114, based on the information of the design rule data 104,
The display position of the dimension value is determined from the position of the cursor 21.
(Note that the dimension value itself is determined by the dimension / shape generating unit 112.
Accurately determine from the drawing position of the dimensions). next,
As shown in FIG. 7C, the dimension candidate display section 11 is displayed in accordance with the information of the determined drawing position of the dimension line and the display position of the dimension value.
In step 5, the size drawing candidate 26 is displayed on the display device 102. At this point, if a dimension drawing determination instruction is input from the input device 101, the dimension drawing unit 116 displays the determined dimension 27 on the display device 102 as shown in FIG. It is registered in the drawing data 103.

FIG. 3 shows an example in which, when a dimension having an inclination with respect to the coordinate axis is drawn, an optimum drawing position of the dimension line is obtained based on the positional relationship of other dimensions and the candidates are displayed. Reference numeral 30 in FIG. 3 is a figure for drawing out the dimension, and reference numerals 301 to 308 are constituent elements of the figure 30, and the dimension 32 has already been drawn out. Reference numeral 31 is a cursor indicating the input position of the pointing device. Now, let us consider a case where dimensions are drawn from the intersections of the elements 301 and 308 and the intersections of the elements 307 and 308, as shown in FIG. First, as shown in FIG. 6B, the position of the cursor 31 is moved to the approximate position where the dimension line is about to be displayed. Using the cursor position 31 as a reference, the dimension / shape generator 112 obtains the positions of the points 331 and 332, which are the ends of the virtual dimension line 33, and the inclination of the dimension line. It should be noted that the dimension line includes the dimension auxiliary line. Next, as in the embodiment shown in FIG. 2, a search area 34 is created to search for a figure or dimension data that affects the determination of the drawing position of the dimension line. The data existing in the search area 34 is extracted (searched) from the existing drawing data and dimension data stored in the drawing data storage unit 103. Next, based on the information of the design rule data 104, the dimension line drawing position determination unit 113 searches the extracted drawing / dimension data for the dimension 32 in which the dimension lines have the same inclination and the dimension lines do not intersect each other. Determine the line drawing position. Similarly, the dimension value display position determination unit 114 determines the display position of the dimension value from the position of the cursor 31 based on the information of the design rule data 104. (It should be noted that the dimension value itself is accurately obtained by the dimension / shape generating unit 112 from the drawing position of the dimension, etc.). Next, as shown in FIG. 7C, the dimension candidate display unit 115 displays the dimension drawing candidate 35 on the display device 102 in accordance with the information about the determined drawing position of the dimension line and the display position of the dimension value. . At this point, the input device 101
When an instruction to determine the dimension drawing is input from, the dimension drawing unit 116 displays the decided dimension 36 on the display device 102 as shown in FIG.
Register in 03.

If there is no dimension to align,
Design rules are conceivable in which the distance from the figure is set at a constant interval, or the dimension drawn from the dimension is always drawn at equal intervals. In addition, it may be possible to provide a function for easily switching whether or not to comply with the design rule.

Although FIGS. 2 and 3 show an example of a case where a new dimension is drawn, the candidates can be displayed in the same manner when the already drawn dimension is moved.

FIG. 4 shows the display positions of the dimensional values defined by the JIS standard. 40 is a figure and 4
1 and 42 are extension lines of the dimension drawn from the figure,
Reference numeral 43 is a dimension line, and reference numerals 440 to 449 show display positions of ten dimension values. As a method of selecting the display position, in addition to the method of automatically determining from the position of the cursor, there is also a method of adding a switching function to an arrow key of a keyboard or a button of a mouse. If the distance between the auxiliary lines is narrow and the dimension value cannot be displayed, 440, 4
41, 448, and 449.

FIG. 5A is a diagram showing a size table that can be used in the embodiments of FIGS. 2 and 3, and FIGS. 5B and 5C are displayed by this size table. It is a figure which shows an example of a screen.

As shown in the examples of FIGS. 2 and 3, in order to retrieve the dimension data having the same inclination as the dimension to be drawn and close to the cursor position from the dimensions already drawn, FIG.
As shown in the table 50 of (a), there is a method of managing a dimensional data by creating a table using the inclination of the dimensional line as a search key. For example, when registering the data of the dimension 53 drawn from the figure 51 of FIG. 5B, the inclination of the dimension is 0 degree, so the dimension line from the origin when the inclination of the coordinate axis 58 is 0 degree. The distance in the Y-axis direction to
This is registered in the table together with the size identification information. In this case, the inclination is 0 degrees, the position is 10, and the dimension 53 is registered.
Next, when the dimension 52 is registered, since the inclination of the dimension is 30 degrees, the Y axis direction from the origin to the dimension line when the inclination of the coordinate axis 58 is 30 degrees as shown in FIG. Is calculated and registered in the table together with the dimension identification information. In this case, the inclination is 30 degrees, the position 30 and the dimension 52 are registered. If the remaining 54 to 57 dimensions are similarly registered, a table as shown in 50 is obtained. With this table, it has the same inclination as the dimensions to be drawn,
When retrieving the dimension data close to the cursor position, the inclination and the distance in the Y-axis direction to the cursor position may be obtained and retrieved in the same procedure as the registration.

FIG. 6 is a diagram showing a processing flow of the embodiment described above. When the size drawing target position (position for measuring the size) is input (step 601), the current cursor position is detected (step 602), and a virtual shape of the size to be drawn is generated at that position. (Step 603). Based on the shape, an area for searching existing (already drawn) dimension data or graphic data that may affect the determination of the dimension drawing position is generated (step 604) and searched. (Step 605).
It is determined whether or not there is existing data or graphic data in the search area (step 606). If not, if not, the drawing position of the dimension line from the current cursor position (step 607) and the display position of the dimension value ( (Step 608)
To decide. In step 606, when there is one or more existing dimension data or graphic data, the design rule data is searched (step 609), and it is determined whether or not there is drawing data or dimension data conforming to the design rule (step 610). In this case, in steps 609 and 610,
Each of the registered design rules is taken up one by one, and it is judged whether or not the existing drawing data or dimension data conforming to each rule exists in the data searched in step 606. is there. For this reason, it is necessary to attach an identification number to each design rule, dimension data, and drawing data, and to provide a correspondence table that associates the design rule with the drawing and dimension data in which it is used (that is compatible with it). There is. Further, the order of search / judgment of the design rules performed in steps 609 and 610 can be prioritized in advance.

In step 610, if there is no suitable drawing / dimension data, the drawing position of the dimension line and the display position of the dimension value are determined from the current cursor position. If there,
According to the design rule, the drawing position of the dimension line (Step 6
11) and the display position of the dimension value (step 612) are automatically determined.

The dimension candidates are displayed at the position thus determined (step 613). After that, inquire about the input for determining the dimension drawing position (step 61).
4) Until the input is made (step 615), the processes after the detection of the cursor position are repeated. When the input is made, the dimension is drawn and the data is registered (step 616).

[0032]

As described above, according to the present invention,
At the time of dimension drawing operation, depending on the other (existing) dimension lines that have already been drawn or the dimension line to be drawn and the input from the input device such as the mouse, the optimum position and the optimum drawing position of the dimension line Since the display position of the dimension value is automatically determined based on a certain design rule, the operator does not have to be aware of the design rule and arranges based on this design rule (according to a certain standard). The optimum size can be drawn while confirming the drawing candidate display of the size on the screen. This allows the dimensions to be drawn quickly and easily. Further, after the dimension drawing, the correction operation such as movement or deletion can be minimized and the operability of the dimension drawing can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a dimension drawing processing unit of a CAD system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of displaying candidates for a drawing position of a dimension line and a display position of a dimension value according to the movement of a cursor.

FIG. 3 is a diagram illustrating an example in which candidates for a drawing position of a dimension line and a display position of a dimension value are displayed according to the movement of a cursor when the dimension for drawing is tilted.

FIG. 4 is a diagram showing display positions of dimensional values in accordance with JIS standards.

FIG. 5 is a diagram showing an example of a table for managing dimension data that has already been drawn, and a display example of a screen corresponding to data values of this table.

FIG. 6 is a diagram showing a processing flow of dimension drawing according to an embodiment of the present invention.

[Explanation of symbols]

20 Figure 21 Cursor 22 Figure 23 Dimension 24 Position of Virtual Dimension Line 25 Data Search Area 26 Candidate Drawing Dimension 27 Dimension Created 30 Figure 31 Cursor 32 Dimension 33 Position of Virtual Dimension Line 34 Data Search Area 35 Dimension Drawing candidate 36 Drawing size 201,202,203,204,205,206,2
07,208 Graphic component 231,232 Dimension auxiliary line 233 Dimension line 234 Dimension value 241,242 Virtual dimension line end point 243,244 Virtual dimension line auxiliary line 301,302,303,304,305, 306,3
07,308 Graphic components 331,332 End points of virtual dimension lines

Claims (2)

[Claims] 1. A CAD system having means for drawing a figure and means for drawing a dimension line and a dimension value on the drawn figure, and another dimension line already drawn and input from an input device such as a mouse. A means for automatically determining the optimum drawing position of the dimension line based on a certain design rule,
A dimension in a CAD system characterized by further comprising means for sequentially displaying an optimal dimension line drawing candidate on a screen in response to an input from an input device at the time of dimension drawing and performing a dimension drawing operation based on the screen. How to draw. 2. A means for automatically determining a display position of an optimum dimension value based on a design rule in accordance with a dimension line to be drawn and an input from an input device such as a mouse, and an input device at the time of dimension drawing. A dimension drawing method in a CAD system, comprising means for sequentially displaying a drawing candidate of a display position of an optimum dimension value on a screen in accordance with an input from, and performing a drawing operation of a dimension based on the drawing candidate.