JPH079659B2 - Drafting system in CAD device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drafting system in a CAD device for creating a drawing by adding dimensions to a figure, and more particularly to a system for automatically generating dimensions.

[Prior Art] In general, a CAD device of this type includes an input device 1, a drawing processing device 2 and a drawing display device 3, as shown in FIG.
The input device 1 is composed of, for example, a keyboard, a mouse, a digitizer, etc., and for inputting a figure (shape) such as a figure element name (circle, line, etc.), figure position (numerical value, position), and dimension data by the operation of the operator. belongs to. The drawing processing apparatus 2 performs general processing of inputting shapes and dimensions and sends the processed drawing data to the drawing display apparatus 3 for display. The drawing display device 3 displays the created drawing.
Here, the drawing data refers to data composed of graphic data and size data, and a drawing is also composed of graphic data and dimensions.

Here, a conventional dimension generation procedure by the CAD device will be described with reference to FIG. There are two types of dimensions: a dimension indicating the distance between the end points of the shape (linear dimension) and a dimension indicating the diameter of a hole or the like (circular element) (arrow dimension).

It is assumed that graphic data as shown in the drawing is input to the drawing processing device 2 in advance and is displayed on the drawing display device 3 (FIG. 3 (1)). First, the operator looks at the drawing display device 3 and operates the input device 1 to recognize (digitize) a part of the shape which is the end point of the length of the dimension by d ₁ and d ₂ , and then displays the dimension data. Use d ₃ to recognize the position you want. Then, these are sent to the drawing processing apparatus 2 and the drawing processing apparatus 2
The dimensional data is generated by and is displayed on the drawing display device 3 in the drawing state in which the dimensions are given to a part of the figure (FIG. 3 (2)).
By such an operation, one dimension is input to the figure. By repeating the same operation, the remaining dimensions are sequentially input (FIG. 3 (3)), and the linear dimension input is completed (FIG. 3 (4)). Finally, the diameter (circular element) is recognized by d ₄ and the arrow dimension is input to complete the mixed input of the linear dimension and the arrow dimension (FIG. 3 (5)).

[Problems to be Solved by the Invention] However, according to the dimension generation procedure using the above-described CAD device, while watching the drawing display device 3, the input device 1 is operated by the number of required dimensions to obtain one shape. Since the parts have to be picked up one by one, the size input work becomes extremely complicated for the operator, and there is a drawback that an input error cannot be avoided.

Further, considering the quality as a drawing, when the dimensions of a figure on one projection plane overlap as shown in FIG. 9 (FIG. 9 (1)), when the dimensions overlap between projection planes (FIG. 9 (2)). )), Etc.
That is, the arrangement of dimensions must be taken into consideration. However, in general, considering the dimensional arrangement, the actual operation often involves troublesome operations such as enlargement, reduction, and movement of the screen, so that there is a drawback in that the dimensional arrangement also takes time.

Therefore, the operation of inputting the dimension takes time which is almost equal to or more than the input of the shape (input of the graphic data). Further, since the operator is left to input the dimensions, there is a drawback that the method of inputting the dimensions (method of describing the dimensions) lacks uniformity.

The object of the present invention is to eliminate the conventional drawbacks regarding the arrangement of dimensions and the description of dimensions by automating the dimension input operation for a figure, shorten the time required for drawing, and arrange the dimensions and describe the dimensions. Can also be unified
It is to provide a drafting system for a CAD device.

[Means for Solving the Problems] A drafting system in a CAD device of the present invention extracts an end point or a center point of a graphic element serving as a base point of a dimension from a graphic input to a drawing processing device, and determines a coordinate component in the same manner. The endpoints or center points on the band line parallel to the coordinate axis are grouped together, dimension is assigned between groups parallel to the coordinate axis with different coordinate components on the same projection plane, and the dimension value is calculated from the distance between the assigned groups. Then, check the overlap between dimensions or between the dimension and the figure from the dimension created by the dimension generation means and the shape and the input figure, and correct these overlaps. And a layout means for sending the figure to the drawing processing apparatus.

[Operation] When the figure input to the drawing processing apparatus is sent to the dimension generating means, the figure is used as data for dimension generation, and the end points of the figure element are extracted from this. Then, these extracted end points are grouped under the coordinate system and dimensions are allocated between the groups, so that dimensions are formed between the allocated groups.

When the dimension thus formed and the graphic input to the drawing processing apparatus are sent to the dimension layout means, the overlap between the formed dimensions and between the dimension and the graphic is checked. If an overlap is found, then the dimension or graphic is moved to correct the overlap. The corrected dimensions and graphics are sent to the drawing processing device, processed and sent to the drawing display device. Therefore, the drawing in which the dimensions are automatically attached to the graphic is displayed on the drawing display device.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 4 to 11.

As shown in FIG. 1, an example of a CAD device for implementing the drafting system of the present invention comprises an input device 1, a drawing processing device 2, a drawing display device 3 and an automatic dimension generation device 6. Of these, the input device 1, the drawing processing device 2, and the drawing display device 3 are conventional CAs.
It is the same as the D device.

The input device 1 is composed of, for example, a digitizer, a mask, a keyboard, and the like.
Data such as arcs, circles, etc., graphic coordinates, etc. and, if necessary, dimension data are input. The drawing processing apparatus 2 is a main control unit that controls the input of figures and dimensions, performs general processing relating to figures, sends the figure data to the drawing display apparatus 3, and the automatic dimension generation apparatus 6 which is an element of the present invention. This is a device for transferring dimension generation control based on graphic data.
The drawing display device 3 is a device for displaying graphic data (shape data), dimension data, and the like.

Further, the automatic dimension generation device 6 has a dimension generation unit 4 and a dimension layout unit 5. The dimension generation unit 4 is the drawing processing device 2
The dimension layout unit 5 receives the figure data and the generated dimension data, and performs the dimension layout given to the figure and the layout in the drawing. Here, the dimension layout means, for example, a layout of dimensions in the projection plane and a layout of dimensions between projection planes when input is made by the trigonal method. It means the layout of the entire drawing that decides whether to place the graphic data and the dimension data in the place.

By the way, as shown in FIG. 4, there are two types of dimensions: a linear dimension (FIG. 4 (1)) and an arrow dimension (FIG. 4 (2)).
There are two types of dimension generation methods: an absolute dimension generation method based on absolute coordinates (Fig. 4 (3)) and a relative dimension generation method based on relative coordinates (Fig. 4 (1)). ) And 2
There are two methods.

FIG. 5 shows a drawing example L by these two dimension generation methods.
FIG. 5 (1) shows the dimension generation based on absolute coordinates, and FIG. 5 (2) shows the dimension generation based on relative coordinates. The processing procedure for performing the drawing by such a dimension generation method by the CAD device shown in FIG. 1 will be described separately for the dimension generation processing procedure and the dimension layout processing procedure.

First, the processing procedure of the dimension generation by the dimension generation unit 4 included in the automatic dimension generation device 6 will be described with reference to FIG.

Extract all the coordinates of the end points of the shape in step 101, and
In 02, the projection planes are associated with each other, and in step 103, the reference point of each projection plane is set. Then, in step 104, dimension allocation for producing a linear dimension is performed, and in step 105, an auxiliary line is produced to improve the quality as drawing data. In step 106, either the absolute coordinate system or the relative coordinate system is selected as the dimension generation method, and the arrow dimension is generated in step 107, and the process is terminated.

Each of these steps will be described in more detail mainly using FIG. The graphic 111 to be processed here is an L-shaped member as shown (FIG. 11 (1)).

Now, in the end point coordinate extraction in step 101, all the end points 112 of the graphic element appearing on each projection plane (plane, front surface, right side surface) of the graphic data are extracted (FIG. 11 (2)). The extracted end point 112 differs depending on the element as shown in FIG.
That is, both end points E ₁ and E ₂ are extracted for a line segment, and a center point O ₁ , a start point E ₁ , an end point E ₂ and a portion E ₃ of the points on the arc necessary for dimension formation are extracted for an arc. It will be. Endpoints for yen, in the case of the inner shape circle center point O _1, in the case of circle contour central points O ₁ and X-direction, 4 Tsu the maximum and minimum points of the Y-direction
Extract E ₁ , E ₂ , E ₃ , and E ₄ , respectively.

In the association of the projection planes in step 102, the end points extracted in step 101 are grouped for each projection plane, and the projection planes are also associated (FIG. 11 (3)).
First, as for grouping on each projection plane, for example, as shown in FIG. 8, the end points on the band line parallel to the X axis having a constant error range in the width direction are put together, and the group in the X direction is
G05 to G07, similarly, the end points on the band line parallel to the Y axis, which has a certain error range in the width direction, are put together, and the group in the Y direction is
Group into groups such as G01 to G04. Then, as shown in FIG. 11 (3), the groups in the X direction grouped on each projection plane are collectively G11 to G16, and the groups in the Y direction are G1 to G10. Correspond. At the time of associating between the projection planes, the positions and lengths of the outer shapes are checked at the same time. If the positions between the projection planes are misaligned, alignment is performed to improve the quality and appearance of the figure. Is corrected.

In the reference point setting in step 103, the minimum values of X and Y coordinates are set. When there are a plurality of projection planes, there are as many reference points as there are projection planes. In this example, three reference points A,
B and C exist (Fig. 11 (3)).

In the dimension allocation in step 104, the groups determined in step 102 are used to determine the groups to which linear dimensions are to be allocated (FIG. 11 (4)). In the figure, the groups in the Y direction (G1 to G10) are all allocated between adjacent groups, whereas the groups in the X direction (G11 to G10) are allotted.
That is not the case in 16). That is, G11-G12, G12
Only -G14, G13-G15, G15-G16 are assigned. This is because, in order to eliminate unnecessary allocation, it is checked that allocation is performed only between groups on the same projection plane and dimension allocation is not performed between groups that span different projection planes. Incidentally, as can be seen from FIG. 11 (3), G11-G12 is the lower side 113 of the front projection plane.
And G12-14 for the front side of the window, and G12-14 for the front side of the projection.
3-G15 means an allocation between the upper and lower round holes 116 and 117 of the right side projection surface, and G15-16 also means an allocation between the upper side 118 and the upper round hole 116 of the right side projection surface.

In this way, the groups are selected and the dimension allocation is performed, and further, from which end point in one group the dimension allocation position is determined.

In the auxiliary line creation in step 105, an auxiliary line is generated for an inner shape such as a circular element or a rectangular shape. This auxiliary line is a line segment existing in the extension of the lead line of the dimension from the center position of the shape, and is drawn to improve the quality as drawing data. In this example, a center line 119 of the plate thickness portion corresponding to the circular holes 116 and 117 which are circular elements and a center line 120 of the circular holes 116 and 117 are drawn (FIG. 11 (5)).

In the absolute or relative dimension creation in step 106, it is first selected here whether the absolute dimension (progressive dimension) is generated or the relative dimension (linear dimension) is generated. According to the selection, the dimension value is calculated from the distance between the groups assigned in step 104. Then, it relates to the dimensions preset in the drawing processing apparatus 2. By using a certain parameter or a similar parameter preset in the automatic dimension generation device 6, the dimension data is generated at the dimension allocation position (FIG. 11 (6)). Specifically, it is generated as shown in FIG.

In the step 107 of generating the arrow size, the arrow size 122 is expressed for the circular element, the circular arc element, etc. in a form in which the same diameters in the same projection plane are put together (FIG. 11 (7)). At this time, due to the preset MAX limit of the number of the same size, the one having the largest number of the same diameter is expressed by the text (text) instead of the arrow size. The text at this time uses the one set in advance as a parameter.

By executing Step 101 to Step 107 described above,
This means that the dimension data to be attached to the graphic data has been generated. However, at this point, the dimensions are merely mechanically attached, so that the dimensions may overlap with each other as shown in FIG. That is, the figure 90 on one projection plane is the size 92
And 93 overlap (Fig. 9 (1)), the figure 100,
The case where the dimensions 103 and 104 overlap between 101 (Fig. 9 (2)) occurs. Therefore, since such an overlap (cross) impairs the quality of the drawing, it is necessary to perform dimensional layout.

Next, the procedure of the dimension layout processing by the dimension layout section 5 which constitutes the automatic dimension generation apparatus 6 will be described with reference to FIG.

First, the layout in the projection plane in steps 201 to 203 is repeated for the number of projection planes, and then the layout between the projection planes in step 204 is performed. In step 201, cross correction between dimensions and figures is performed, and in step 202, cross correction between dimensions and dimensions is performed. Then, in step 203, it is judged whether or not there is a cross, and if there is a cross, the process returns to step 201, and if there is no cross, the layout between projection planes is proceeded to. In step 204, the duplication between the projection planes is corrected.

Now, in step 201, the cross between the dimension and the figure is corrected. As described above, the dimension data is mechanically generated at the allocation position determined by using a certain constant parameter, and therefore some points may intersect with the figure data.
This crossed dimension data is moved to determine the optimum dimension generation position. Even in making this determination, the movement is made according to certain parameters, but if the movement is made to a large extent, the quality and appearance of the drawing will deteriorate. Therefore, a certain movement allowable range is provided so that the movement for cross correction does not exceed that range. If it cannot be corrected within the movement range, the dimension data is marked as warning information that cannot be corrected.

In this way, when the cross-check and the correction are completed for all the dimensions in one projection plane, the cross-check and the correction for another projection plane are performed. Then, when all projection planes have been completed, next, cross correction between dimensions is performed.

In the dimension and dimension cross correction of step 202, similarly to step 201 of performing dimension and figure cross correction, movement by a certain fixed parameter is performed within the limits of a certain movement range, and this is repeated for the number of projection planes. , Correct all crosses that occur on each projection plane. It should be noted that, in the case of the cross correction of the dimension and the dimension, in order to prevent the cross correction of the dimension and the figure which has already been completed, consideration is taken not to cross the figure.

Further, in particular, in the case where a dimension and a figure, and a location where the dimension and the dimension cross each other exist at the same time in one projection plane, the dimension and the figure and the dimension and the dimension cross correction are not individually performed, but
Try to do them at the same time. That is, the parameters are automatically changed and the same processing as the above-described individual processing is performed. This is repeated several times to correct, but if the crossing portion still does not disappear, information indicating that the crossing is provided is added to the dimension data as warning information.

After finishing the layout in each projection plane in this way,
Layout between projection planes continues.

In step 204 of laying out between the projection planes, in order to lay out the entire drawing, the other projection planes are moved with reference to one projection plane so that there are no crossing points. Because of this movement, there is a possibility that the drawing size may not fit within the drawing size. Therefore, in preparation for this case, the optimum drawing size can be set.

When both the dimension generation processing and the dimension layout processing described above are completed, the drawing data in which the dimension data is added to the graphic data obtained by these processings is transferred from the automatic dimension generation device 6 to the drawing processing device 2, Drawing display device 3
Sent to and displayed as a drawing. In this case, the data may be sequentially sent to the drawing display device 3 and displayed step by step during the processing.

From the drawings displayed in this manner, the operator finds the dimensions with the warning information mark or the cross information and operates the input device 1 to correct these dimensions.

As described above, according to the present embodiment, the automatic dimension generation device 6 for automatically generating the dimension data and the layout of the dimension data is provided for the graphic data. It is not necessary to input the data individually via the input device 1, so that the time used for the dimension input can be saved. Further, by automatically inputting the dimensions, the method of describing the dimensions left to the operator is unified.

Although the automatic dimension generation device 6 is provided separately from the drawing processing device 2 in the above embodiment, when the drawing processing device 2 is configured by a microcomputer, the automatic dimension generation device can be changed by changing the program. Since the operation of 6 can be executed, it can be integrated with the drawing processing apparatus 2.

[Effects of the Invention] According to the present invention, in particular, end points or center points on a band line parallel to a coordinate axis having the same coordinate component are grouped together, and between groups parallel to the coordinate axis having different coordinate components on the same projection plane. Dimension is assigned to, the dimension value is calculated from the distance between the assigned groups, and the dimension is generated.
Since the dimension generation and its layout are automatically performed based on the figure, the complicated dimension input operation via the conventional input device is eliminated, and the drawing time until the drawing is completed can be greatly reduced. . Further, since the dimension generation is automatically performed without human intervention, the dimension generation method is unified and input errors are eliminated, so that the quality of the drawing can be improved as much as possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a drafting system in a CAD device according to an embodiment of the present invention. FIG. 2 is a block diagram of an example of a conventional CAD device that constitutes a drafting system, FIG. 3 is an explanatory diagram of a dimension generation procedure in a conventional CAD device, FIG. 4 is an explanatory diagram showing types of generated dimensions, and FIG. Is an explanatory diagram of a drawing drawing based on an example of a dimension generation method of absolute coordinates and relative coordinates, FIG. 6 is an explanatory diagram showing a procedure of dimension generation according to the present embodiment, and FIG. 7 is an explanatory diagram showing end point extraction points for each graphic element. FIG. 8 is an explanatory diagram of grouping of end points according to an embodiment of the present invention, FIG. 9 is an explanatory diagram showing a case where dimensions are overlapped in a projection plane shape, and FIG. 10 is a dimension layout processing procedure according to the present embodiment. 11 is an explanatory diagram showing FIG.
It is a detailed explanatory view of the dimension generation procedure shown in the figure. In the figure, 1 is an input device, 2 is a drawing processing device, 3 is a drawing display device, 4 is a dimension generation unit, 5 is a dimension layout unit, and 90,10.
0, 101 is a figure, 91-95, 102-105 are dimensions, 111 is a figure, 11
2 is an end point, and G1 to G16 are groups.

Claims (1)

[Claims] 1. In a CAD device for processing a graphic input by an input device by a drawing processing device and displaying it on a drawing display device, an end point of a graphic element which is a base point of a dimension from a graphic input in the drawing processing device. Or extracting the center point, grouping the end points or center points on the band parallel to the coordinate axis having the same coordinate component as a group, and performing dimension allocation between groups whose coordinate components on the same projection plane are different from each other, The dimension generation means that calculates the dimension value from the distance between the assigned groups to generate the dimension, and the dimension created by the dimension generation means and the figure entered, and check the overlap between the dimensions or between the dimension and the figure, In a CAD device, characterized in that it is provided with a dimensional layout means for correcting the overlapping of the lines and sending the corrected size and figure to the drawing processing device. System.