JP3332502B2 - Offset figure creation method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset graphic generating method for generating an offset graphic by giving an offset amount to each component of a graphic composed of CAD graphic elements (line segments, arcs, etc.) such as an information processing system. And its equipment.

[0002]

2. Description of the Related Art As a method of creating an offset figure by giving an offset amount to each constituent element of a figure composed of graphic elements (line segments, arcs, etc.), an offset shape obtained by offsetting each graphic element by an offset amount is used. There is known a method of creating, obtaining an offset-shaped contact point in the order of the original figure, and connecting them.

[0003] This method, graphical elements (line segments, arc, etc.)
Gives an offset amount to each component of the figure composed of
To create an offset shape, for each shape element,
An offset shape offset by the offset amount is created, a contact point of the offset shape is obtained in the order of the original figure, and the offset shape is connected at the contact point to obtain the entire offset shape.

[0004]

However, if there is no offset-shaped contact, the conventional method cannot generate the entire offset shape.

For example, as shown in FIG. 3, when the original figure is composed of line segments e1 and e3 and an arc e2, there is no contact point between the offset shapes. That is, the offset shape e1 'of the line segment e1 and the offset shape e2' of the arc e2,
There is a drawback that the offset shape e2 'of the arc e2 and the offset shape e3' of the line segment e3 have no contact, and an offset figure cannot be created.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and has an offset graphic creating method capable of generating an appropriate offset graphic even when offset values with respect to an original graphic element are different and there is no contact between adjacent offset graphics. It is intended to provide the device.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
Offset Geometry method according to the present invention, the storage means
From among the stored original figures , an arc figure element, the arc figure
The figure element before the shape element and the figure element after the arc graphic element
A readout step for reading , an offset figure, a figure before offset, and an offset with respect to each of the readout arc figure element, the figure element before the arc figure element, and the figure figure after the arc figure element. A generating step of generating a post-graphic by a generating means; and if there is no contact between the pre-offset graphic and the offset graphic, and between the post-offset graphic and the offset graphic, one end point of the pre-offset graphic and the post-offset graphic. A new offset graphic generating step of generating, by the generating means, a new offset graphic of an arc centered on a bisector of a section straight line connecting the sections, the new offset graphic and the offset
The subsequent figure and the new offset figure are generated by
And a storage step of storing in the storage means in association with the storage means .

[0008]

Also, according to another aspect of the present invention, there is provided an offset.
The figure creation method is based on whether the original figure stored in the storage
The arc graphic element, the graphic element before the arc graphic element,
A reading step of reading the graphical elements after the serial arc graphic element before
An offset graphic corresponding to each of the read-out arc graphic element, the graphic element before the circular arc graphic element, and the graphic element after the circular arc graphic element by a predetermined distance,
A generating step of generating a pre-offset graphic and a post-offset graphic by a generating unit; and, if there is no contact between the pre-offset graphic and the offset graphic, and between the post-offset graphic and the offset graphic, A new offset figure having an arc center at the intersection of the perpendicular line from the arc center of the figure after offset with the figure, the intersection with the figure after offset, and the intersection with the figure before offset is generated by the generation means. A new offset figure generating step to be generated, the figure before the offset and the figure after the offset
The shape and the new offset figure are paired with the source graphic element.
A storage step for storing the information in the storage means in response to the request.

[0010]

Further, an offset figure creating apparatus according to another aspect of the present invention has the following configuration. That is, an apparatus for generating an offset graphic from an original graphic, wherein an arc graphic element, a graphic element before the arc graphic element,
Generating means for generating an offset graphic, a pre-offset graphic, and a post-offset graphic corresponding to each of the posterior graphic elements of the arc graphic element by a predetermined distance,
If there is no point of contact between the pre-offset graphic and the offset graphic and between the post-offset graphic and the offset graphic, the center is set at the bisecting point of the section straight line connecting the one end point of the pre-offset graphic and the post-offset graphic. And a new offset graphic generating means for generating a new offset graphic of an arc.

[0012]

[0013] An offset according to another aspect of the present invention.
The graphic creation device is a device that generates an offset graphic from an original graphic, and in the original graphic, an arc graphic element, a graphic element before the circular graphic element, and a graphic element after the circular graphic element, Generating means for generating an offset graphic, a pre-offset graphic, and a post-offset graphic respectively corresponding to a predetermined distance, a contact point between the pre-offset graphic and the offset graphic, and between the post-offset graphic and the offset graphic. If not, a perpendicular from the arc center of the post-offset graphic to the pre-offset graphic;
A new offset graphic generating means for generating a new offset graphic having an arc center at an bisecting point between the intersection with the post-offset graphic and the intersection with the pre-offset graphic.

[0014]

[0015]

In the above arrangement, an arc graphic element is selected from the original graphic stored in the storage means,
Read out the shape element, the figure element after the arc figure element, and
The read-out arc graphic element, the preceding graphic element of the circular arc graphic element, and the rear graphic element of the circular arc graphic element are separated from each other by a predetermined distance.
The pre-offset graphic and the post-offset graphic are generated by generating means, and if there is no contact between the pre-offset graphic and the offset graphic and between the post-offset graphic and the offset graphic, the pre-offset graphic and the The generating means generates a new offset graphic of an arc centered on a bisector of a section straight line connecting one end point of the post-offset graphic, and the pre-offset graphic, the post-offset graphic,
Correlate the new offset figure with the original figure element
In the storage means .

[0016]

According to another configuration , the information is stored in the storage means.
From among the original figures , the arc figure element and the arc figure
Read the element before the elementary element and the element after the arc element
The read-out and read-out arc graphic element, the graphic element before the circular arc graphic element, and the graphic element after the circular arc graphic element are respectively separated by a predetermined distance, corresponding to the offset graphic, the pre-offset graphic, and the post-offset graphic. Generate shape hand
Generated by the step, and the offset front shapes and between the offset figure, if there is no contact between the offset graphics and the after offset figure, and the perpendicular from the arc center of the offset post figure for the offset prior figure, the offset and the intersection of the rear figures, the bisector point between the intersections of the offset front graphic, generated by the new offset figure said generating means for the arc center, and the offset front graphic
The post-offset graphic and the new offset graphic are
The data is stored in the storage unit in association with the original graphic element .

[0018]

Further , according to another configuration , the generating means may determine a predetermined shape for each of the arc graphic element, the graphic element before the circular arc graphic element, and the graphic element after the circular arc graphic element in the original graphic. Offset shapes corresponding to each other at a distance,
A pre-offset graphic and a post-offset graphic are generated, and the new offset graphic generation means, if there is no contact between the pre-offset graphic and the offset graphic and between the post-offset graphic and the offset graphic, A new offset graphic of an arc centered on the bisecting point of a section straight line connecting one end point of the post-offset graphic is generated.

[0020]

Further , according to another configuration , the generating means is configured to determine , for each of the arc graphic element, the graphic element before the arc graphic element, and the post graphic element after the arc graphic element, a predetermined graphic element in the original graphic. Offset shapes corresponding to each other at a distance,
A pre-offset graphic and a post-offset graphic are generated, and the new offset graphic generation means, if there is no contact between the pre-offset graphic and the offset graphic and between the post-offset graphic and the offset graphic, A perpendicular from the arc center of the figure after the offset,
A new offset figure having an arc center at an intersection between the intersection with the figure after offset and the intersection with the figure before offset is generated.

[0022]

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is a block diagram showing the configuration of an information processing system to which the offset figure creating method of this embodiment is applied. The central processing unit h1 controls the offset graphic creation processing. The storage device h4 is, for example, a semiconductor memory and stores various programs and data described below.
That is, a program describing the offset graphic creation processing procedure.

B Data corresponding to CAD graphic elements. For example, when the graphic element is a two-dimensional line segment, it is the coordinate data of the start point and end point. When the graphic element is a two-dimensional arc, it is the coordinate values of the start point, the end point, the center, and the rotation direction data. Further, when the graphic element is a two-dimensional circle, it is data such as geometric information sufficient to determine a graphic element such as a central coordinate value and a radius, information on the graphic element, and arrangement information.

C Closed figure data obtained by connecting CAD figure elements to form a closed figure.

D Calculation results generated during the offset figure creation processing.

Are stored in the storage device h4.

The display device h2 displays figures, command menus, and the like on a CRT display, an LCD display, or the like. The input device h3 includes, for example, a keyboard and a pointing input device, and performs input of a drawing reading instruction, a menu selection instruction, and other instructions. The information reading device h5 reads, for example, an offset creation processing program recorded in a card reader. The secondary storage device h6 is, for example, a hard disk or a floppy disk, and stores the above programs and data.

In this embodiment, it is assumed that a program for creating an offset process or the like is stored in the storage device h4 or the secondary storage device h6 in advance. Central processing unit h
1, serial CAD graphic element data, such as offset processing target graphic stored in憶device h4, reads out the data necessary for data like processing required to offset processing performs graphic processing, also an offset processing result Are stored in the storage device h4.

FIG. 1 shows a processing flow for creating an offset figure by the central processing unit h1.

In step S1, the central processing unit h1
The first graphic element is extracted from the graphic for offset processing stored in the storage device h4. Hereinafter, this graphic element Z1 will be referred to.

In step S2, the central processing unit h1
It is determined whether the graphic element Z1 is a circular arc. If the graphic element Z1 is a circular arc, the process proceeds to a series of processing steps from step S3 to perform offset processing corresponding to the circular arc. If the graphic element Z1 is not a circular arc, the process proceeds to step S9.

In step S3, the central processing unit h1
From the offset processing target graphic stored in the storage device h4, a graphic element (hereinafter, referred to as a graphic element before and after the graphic element Z1 (circular arc)) is used.
(Before and after graphic elements). The preceding and succeeding graphic elements are composed of a graphic element of a front part and a graphic element of a rear part.

In step S4, the central processing unit h1
The connection information between the graphic element Z1 (arc) and the preceding and succeeding graphic elements extracted in step S3 is created. The procedure for creating this connection information is performed as follows.

First, a tangent vector at a connection point between the graphic element in the front part, the graphic element in the rear part, and the graphic element Z1 of the preceding and following graphic elements is obtained. Each graphic element is given a direction in advance. This direction is attached to follow successive graphic elements counterclockwise or clockwise.
In the present embodiment, it is assumed that the direction is given in advance in the clockwise direction. Next, between the obtained vectors sharing the connection point, that is, between the graphic element Z1 and the graphic element of the front part of the preceding and succeeding graphic elements, and between the graphic element Z1 and the graphic element of the rear part of the preceding and succeeding graphic elements Find the outer and inner products of. However, the magnitude of each vector is calculated as one unit vector. The meaning of finding the outer product between the tangent vector of the graphic element Z1 and the tangent vector of the preceding graphic element of the preceding and succeeding graphic elements is to determine whether or not they are continuous at the connection point by examining the magnitude of the outer product. It is. That is, if the magnitude of the outer product is 0, it is determined that the product is continuous at the connection point. Further, the meaning of obtaining the inner product is to determine whether the angle at the connection point of the graphic formed by the two elements is an obtuse angle or an acute angle. That is, a positive value of the inner product indicates an obtuse angle, and a negative value indicates an acute angle. Further, the meaning of obtaining an outer product and an inner product between a tangent vector of the graphic element Z1 and a tangent vector of a graphic element at a rear part of the preceding and following graphic elements is the same.

In step S5, if the outer product is 0 and the inner product is positive using the connection information obtained by the outer product / inner product created in step S4, the process proceeds to step S6, where a special offset process is performed. Otherwise, the process proceeds to step S9, where a simple offset process is performed.

That is, in this embodiment, the processing for obtaining the special offset is performed on graphic elements that are continuous and obtuse with respect to the connection point.

In step S6, offset shapes are created for the graphic element Z1 and the preceding and following graphic elements.

A linear or curved offset shape separated by a predetermined offset distance from each graphic element is generated.
At this time, if there is no contact between adjacent offset shapes, the offset shape is determined as follows.

The procedure for creating an offset shape is described below with reference to FIGS.
This will be described with reference to the explanatory diagram of FIG.

FIG. 4 is a diagram for explaining a process of creating an offset figure when there is no contact point in the offset shape. The graphic elements e1 and e3 are segmented straight lines, respectively, and are not parallel to each other. The graphic element e2 is a segmented arc. The graphic elements e1 and e2 are connected at a connection point P40. Graphic element e2, e3 is connected at the connection point P 41. An offset shape is generated from these graphic elements in the following procedure.

1. A straight line having an offset shape e1 'is generated at a position away from the graphic element e1 by a predetermined offset distance α40. Similarly, an offset shape e3 ′ is located at a position separated from the graphic element e3 by a predetermined offset distance α41.
To generate a straight line. Further, a circle having an offset shape e2 "is generated at a position away from the arc e2 of the center point C2 by a predetermined offset distance α42. In the offset shapes e1 ', e2", and e3' thus generated, an offset is generated. There is no connection point between the shape e2 ″ and the offset shapes e1 ′, e3 ′.

2. The offset shape e2 "is moved between the straight line connecting the point P43 and the center point C2 to a position where the offset shape e2" is in contact with the offset shapes e1 'and e3' to generate an offset shape e2 'of the center point C2'. The shape e2 'and the offset shapes e1' and e3 'are connected by contact points p1 and p2, respectively, where the offset shape e2 "is scaled by a predetermined size to obtain a scaled offset shape. The offset shape e2 ″ is changed to the offset shape e
It moves between the straight line connecting the point P43 and the center point C2 to the position where it touches 1 ', e3', and the offset shape e of the center point C2 '
2 ′ may be generated.

Note that each predetermined offset value is determined by the input device h.
3 or may be attached to each graphic element data in advance.

FIG. 5 shows an example of generating an offset figure when the preceding and following figure elements (line segments) are parallel. FIG. 5 is a diagram for explaining an offset graphic creation process when there is no contact point in the offset shape, as in FIG.

The graphic elements e51 and e53 are segmented straight lines, respectively, and the graphic element e52 is a segmented arc. The graphic elements e51 and e52 are connected at a connection point P51. The graphic elements e52 and e53 are connected at a connection point P52. An offset shape is generated from these graphic elements in the following procedure.

1. An offset shape e51 'is located at a position away from the graphic element e51 by a predetermined offset distance α51.
To generate a straight line. Similarly, a straight line having an offset shape e53 ′ is generated at a position separated from the graphic element e53 by a predetermined offset distance α53. Further, a circle having an offset shape e2 "is generated at a position apart from the arc e52 of the center point C50 by a predetermined offset distance α52. The offset shapes e51 ', e52", and e5 thus generated are generated.
3 ′, the offset shape e52 ″ and the offset shape e
There is no connection point between 51 'and e53'.

2. When the offset position of the end point p51 of the graphic element e51 is p51 'and the offset position of the start point p52 of the graphic element e53 is p52', p51 'and p5
The midpoint between 2 'and C50 is defined as C50. Then, an offset shape e52 'in which the middle point C50 is the center of the arc is generated. Thus, the offset elements e51 ', e52', e5
An offset shape consisting of 3 'is generated. Each of these generated offset element data is stored in the storage device h4 in correspondence with the graphic element of the creation source.

FIG. 6 shows an example of generation of an offset graphic in the case where the graphic element in the front part of the preceding and succeeding graphic elements is a straight line and the graphic element in the rear part is an arc. FIG. 6 is a diagram for explaining the offset graphic creation processing when there is no contact point in the offset shape, as in FIGS. 4 and 5.

The graphic element e61 is a segmented straight line, and the graphic elements e62 and e63 are segmented arcs. Graphic element e61,
e62 is connected at a connection point P61. The graphic elements e62 and e63 are connected at a connection point P62. An offset shape is generated from these graphic elements in the following procedure. It is assumed that different offset distances are set for each graphic element.

1. An offset shape e61 ′ is located at a position separated from the graphic element e61 by a predetermined offset distance α61.
To generate a straight line. Similarly, an offset shape e63 ′ whose center is a circle of C63 is generated at a position away from the graphic element e63 by a predetermined offset distance α63. Further, a circle having an offset shape e62 ″ is generated at a position away from the arc e62 by a predetermined offset distance α62. The offset shapes e61 ′, e62 ″, and e6 thus generated are generated.
In 3 ', there is no connection point.

2. A perpendicular line from the arc center c63 of the graphic element to the offset shape e61 'is obtained, and the offset shape e6 is obtained.
The contacts of 1 ′ and e63 ′ are p61 and p62, respectively, and an offset shape e62 ′ is created such that the midpoint between p61 and p62 is the center of the arc. On the other hand, when the offset shape e61 'is an arc, a straight line connecting the arc center of the offset shape e61' and the arc center c63 is obtained, and each contact point with the offset shapes e61 'and e63' is p6.
1, an offset shape e62 'is created such that the midpoint between p61 and p62 is the center of the arc. Thus, the offset elements e61 ′, e62 ′, e6
An offset shape consisting of 3 'is generated. Each of these generated offset element data is stored in the storage device h4 in correspondence with the graphic element of the creation source.

For the graphic element for which the offset processing has been completed, the processing flag corresponding to each graphic element stored in the storage device h4 is turned on so as to indicate that the offset processing has been completed. As an initial state of the offset graphic creation processing, a processing flag indicating an offset processing state of each graphic element is turned off in advance. This is the end of the description of the processing in step S6.

In step S7, it is determined whether the offset processing has been completed for all the constituent elements of the graphic to be subjected to the offset processing. This is determined by referring to the processing flag on the storage device h4. When all the processing flags are turned on, the offset graphic creation processing ends. If any of the processing flags remains off, it indicates that the offset processing has not been completed, and step S
Proceed to 8.

In step S8, a graphic element to be processed next is extracted, and the process returns to step S2.

In step S9, the offset shape of the previous graphic element is referred to from the storage device h4 to create an offset shape, and a contact point between adjacent offset shapes is set as a connection point. Each of the generated offset element data is stored in the storage device h4 in association with the graphic element of the creation source. Further, the processing flag on the storage device h4 indicating that the offset processing has been completed is turned on.

The offset figure creating method described above is
For example, this is effective when an object having the shape shown in FIGS. FIG. 7A is a diagram of the processed object viewed from directly above, and FIG. 7B is a diagram of the processed object viewed from the side.
The central portion of the object (hereinafter, referred to as an island 75) is higher than the periphery, and the gradient from the top to the bottom of the periphery 76 of the island 75 is different on the side surface of each island portion. That is, the surface of 70 is 1
The surface 71 has a gradient of 2 degrees, the surface 72 has a gradient of 0 degrees, and the surface 73 has a gradient of 4 degrees. In order to process the object having the shape of the island 75 having such a different gradient, as shown in FIG. The offset graphic 82 is obtained by the generation method, and the rotating byte 74 is scraped by tracing the original graphic element 81 and sequentially shifted in the direction of the offset graphic 82 to obtain a smooth object having a gradient shown in FIG. Can be processed.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Needless to say, the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or an apparatus.

As described above, according to the present embodiment, the following effects can be obtained. That is, an appropriate offset figure can be generated even when the offset values with respect to the original figure element are different and there is no contact between adjacent offset figures.

[0061]

As described above, according to the present invention, an appropriate offset figure can be generated even when offset values for the original figure elements are different and there is no contact between adjacent offset figures.

[0062]

[Brief description of the drawings]

FIG. 1 is a flowchart of an offset graphic creation process.

FIG. 2 is a block diagram of an information processing system according to the embodiment.

FIG. 3 is an explanatory diagram in a case where there is no contact in an offset shape.

FIG. 4 is a diagram illustrating an example of processing of an offset figure when processing can be performed only by parallel movement;

FIG. 5 is a diagram showing an example of creating an offset figure when the preceding and following figure elements (line segments) are parallel.

FIG. 6 is a diagram illustrating an example of creating an offset graphic based on the shortest distance between preceding and succeeding graphic elements.

FIG. 7 is a drawing of an object to be machined with different draft angles set.

8 is a diagram illustrating an example of an offset graphic for processing into the object of FIG. 7;

[Explanation of symbols]

 h1 central processing unit h2 display device h3 input device h4 storage device h5 information reading device h6 secondary storage device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 17/50 620 JICST file (JOIS)

Claims (8)

(57) [Claims] 1. A method for generating an offset graphic from an original graphic , comprising: an arc graphic element;
Before the arc graphic element, after the arc graphic element
A reading step of reading a graphic element, for each of the read arc graphic element, a graphic element before the arc graphic element, and a graphic element after the arc graphic element,
The offset figure, the figure before offset, and the figure after offset are generated by a predetermined distance.
A generating straight line that connects between the pre-offset graphic and the offset graphic, and between the one end point of the pre-offset graphic and one end point of the post-offset graphic if there is no contact between the post-offset graphic and the offset graphic. A new offset graphic generating step of generating, by the generating means, a new offset graphic of an arc centered on the bisector of (a), the pre-offset graphic, the post-offset graphic and the new
The offset figure is made to correspond to the figure element
And a storage step of storing in the storage means . 2. A method for generating an offset graphic from an original graphic , comprising: an arc graphic element,
Before the arc graphic element, after the arc graphic element
A reading step of reading a graphic element, for each of the read arc graphic element, a graphic element before the arc graphic element, and a graphic element after the arc graphic element,
Offset figures, pre-offset figures, and post-offset figures corresponding to each other at predetermined distances are generated by the generation means.
A generation step of further generating, said offset front shapes and between the offset figure, if there is no contact between the offset graphics and the after offset figure, and the perpendicular from the arc center of the offset post figure for the offset prior figures, A new offset graphic having the bisector between the intersection with the post-offset graphic and the intersection with the pre-offset graphic as the center of the arc is sent to the generation means.
A new offset figure generating step of further generating, said offset prior figures and the after offset figure and the New
The offset figure is made to correspond to the figure element
And a storage step of storing in the storage means . 3. The offset graphic generation method according to claim 1, wherein the graphic before offset and the graphic after offset are section straight lines parallel to each other. 4. An apparatus for generating an offset graphic from an original graphic, comprising: an arc graphic element, a graphic element before the circular graphic element, and a graphic element after the circular graphic element in a base graphic;
Generating means for generating an offset graphic, a pre-offset graphic, and a post-offset graphic respectively corresponding to a predetermined distance, contact points between the pre-offset graphic and the offset graphic, and between the post-offset graphic and the offset graphic If not, a new offset graphic generating means for generating a new offset graphic of an arc centered on a bisecting point of a section straight line connecting one end point of the graphic before offset and the one end of the graphic after offset is provided. Offset figure generator. 5. An apparatus for generating an offset graphic from an original graphic, comprising: an arc graphic element, a graphic element before the circular graphic element, and a graphic element after the circular graphic element in the original graphic.
Generating means for generating an offset graphic, a pre-offset graphic, and a post-offset graphic respectively corresponding to a predetermined distance, contact points between the pre-offset graphic and the offset graphic, and between the post-offset graphic and the offset graphic If not, a new offset centered on an arc is a perpendicular line from the arc center of the post-offset graphic with respect to the pre-offset graphic, an intersection of the post-offset graphic and an intersection with the pre-offset graphic. And a new offset graphic generating means for generating a graphic. 6. The offset graphic generating apparatus according to claim 4 , wherein the graphic before offset and the graphic after offset are section straight lines parallel to each other. 7. The graphic before the offset and the offset
The subsequent figure and the new offset figure are generated by
Characterized by further comprising storage means for storing in association with
The offset figure generating apparatus according to claim 4, wherein 8. The offset pre-offset graphic and the offset
The subsequent figure and the new offset figure are generated by
Characterized by further comprising storage means for storing in association with
The offset figure generating apparatus according to claim 5, wherein