JPH01113872A - Formation of offset pattern - Google Patents

Abstract

PURPOSE:To form an offset pattern with which a desired offset value is secured even though the offset value increases relatively to a pattern set before offset by detecting automatically an offset pattern element that cannot secure the offset value via an electronic computer and erasing abnormal offset pattern element groups. CONSTITUTION:A pattern element arranging means is used together with an offset pattern forming means, and an offset pattern correcting means which corrects the pattern element of a part in case some element of a produced offset pattern has abnormality. In such constitution, the abnormal offset pattern element is automatically erased by an electronic computer even if a cross is formed between the pattern elements after offset. Furthermore two offset pattern elements crossing each other are formed again. Thus it is possible to form an offset pattern with which the desired offset value is always secured.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention is used for creating CAD methods related to press mold design and NC data for NC gas cutting equipment, etc. The present invention relates to an offset figure creation method for automatically creating offset figures for.

(Prior Art) Conventionally, the CAD method has been known as an information processing system related to press die design, but in this CAD method, an offset figure is offset by a set offset amount (clearance amount in the case of a press die). A method of creation is used. FIG. 4 is an explanatory diagram showing the relationship between figures before and after offset, where 1 is a figure before offset and 2 is a figure after offset. The offset amount d is set in advance.

FIG. 3 is a flowchart showing a conventional offset figure creation method, in which figure element alignment means S1 arranges figure elements before offset so as to be continuous in the clockwise direction of the figure.
and an offset figure creating means S2 which creates an offset figure element while calculating the intersection of offsets of two adjacent figure elements, and finally creates an offset figure.

Further, the offset figure creation means S2 performs a search pointer initialization step S21, a search pointer addition step S22 of sequentially adding 1 to the search pointer, a figure element indicated by the search pointer, and a clockwise direction of the figure. Next, there is a post-offset intersection calculation step S23 in which the intersection after offset of two connected graphical elements is calculated, an initial determination step S24 in which it is determined whether the search pointer is 1 and the next step is determined, and a search an offset graphic element alignment means S25 that creates an offset graphic element with the previous intersection as the starting point and the current intersection as the end point when the pointer for the previous intersection is other than 1; and a previous intersection updating step S26 that replaces the current intersection with the previous intersection; Search completion determination step S2 for determining whether the search for all graphical elements has been completed.
It consists of 7.

Hereinafter, the operation of the prior art will be explained with reference to FIGS. 3 and 4.

First, the graphic element arranging means S1 sets an arbitrary graphic element among the graphic elements touching the circumscribed rectangle of the figure as an alignment start graphic element, calculates the preceding and succeeding graphic elements connected to both end points, and calculates the three
From the positional relationship of the two graphic elements, a start point and an end point are calculated so that the alignment start graphic element is in the clockwise direction of the graphic. Thereafter, the end point of the graphic element connected to this end point is found, and the graphic elements are arranged so that the end point becomes the starting point, thereby arranging all the graphic elements in a clockwise direction.

In FIG. 4, when the alignment start graphic element is 1a,
The graphic elements are arranged so as to form the starting points P L , P 2 , . . . , P8 of the graphic elements.

Next, the offset figure creation means S2 creates an offset figure in the following procedure.

First, the search pointer initialization step S2+ stores O in the search pointer indicating the search position of a graphic element and initializes it.

Next, in the search pointer addition step S2□, 1 is added to the search pointer. In FIG. 4, the graphic element 1a is designated by the search pointer.

Next, in the post-offset intersection calculation step S23, the intersection point PT of the two graphic elements, the graphic element 1a specified by the search pointer and the next graphic element 1b, is offset by the offset Qd.

Calculate and set this as the current intersection.

In the initial determination step 824, it is determined whether the previous intersection point has been calculated based on the value of the search pointer, and if the search pointer is 1, the process proceeds to the previous intersection update step S26, and if it is other than 1, an offset graphic element is created. Branch to step S2S. Currently, the search pointer is 1, and the previous intersection update step S26
Branch into.

In the previous intersection update step S26, the current intersection PT is stored in the previous intersection.

Next, in the search completion determination step S27, it is determined whether offset graphic elements have been created for all graphic elements, and if the search has not been completed, the process branches to the search pointer addition step S2□, and if the search has been completed, the processing terminate.

Therefore, the process loops until the processing of each process from the search pointer addition process S2□ to the search terminal side cutting process S27 is completed, but after the second loop, the process goes through the offset graphic element creation process S25, and here An offset graphic element is created with the previous intersection as the starting point, the current intersection as the end point, and of the same type (line segment, circular arc, etc.) as the graphic element specified by the search pointer.

In FIG. 4, when the search pointer specifies graphic element 1b, the previous intersection point PT is the starting point, the current intersection point PT2 is the ending point, and since graphic element 1b is a line segment, the line segment offset is Create graphic element 2b.

Thereafter, by performing similar processing, PT, , PT2,
..., each offset graphic element is created starting from PT8, and offset graphic 2 is created.

(Problems to be Solved by the Invention) As described above, according to the conventional method, it is possible to create a normal offset figure for the situation shown in FIG. 4.

However, as shown in FIG. 2, when the offset ld is large relative to the figure 1 before the offset, an intersection occurs between the figure elements of the figure 2 after the offset.
A situation occurs in which the offset graphical element between them becomes abnormal,
A problem arises in that the required offset amount cannot be secured.

SUMMARY OF THE INVENTION An object of the present invention is to provide an offset figure creation method that creates an offset figure that ensures a requested offset amount even if the offset amount is large relative to the figure before offset. [Structure of the Invention] (Means for Solving the Problem) The offset figure creation method of the present invention includes a computer equipped with conventional figure element alignment means and offset figure creation means.
Further, an offset figure correction means is added, and this offset figure correction means mainly performs an offset figure element intersection check step for checking intersections between figure elements after offset, and an abnormal figure element for determining and erasing the position of an abnormal offset figure element. The present invention is characterized by comprising an erasing step and an intersecting graphic element updating step of re-creating an offset graphic element such that the intersection of two intersecting offset graphic elements is an end point.

(Operation) According to the above method, even if an intersection occurs between the offset graphic elements, the computer automatically deletes the abnormal offset graphic element and recreates the two intersecting offset graphic elements. From this, it is possible to create an offset figure that always secures the required offset amount.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 2 is an explanatory diagram of the offset figure creation method of the present invention, in which figure 1 before offset is at the starting point PI.
+ p21 to P8 and end point P2 + P3
Graphic element 1a with + ~ + P 8 + P I
.

It consists of lb, ~, lh.

Further, 2 is an offset figure when an abnormality occurs, and like the figure 1 before offset, the starting point PT.

PT2. ~． PT8 and end points P T2 , P Tl
,~PT8. PT, graphic elements 2b+2c,
~.

2h and 2a, and intersects with the offset graphic elements 2b and 2e at an intersection point PT. FIG. 1 is a flowchart showing the offset figure creation method of the present invention, and since it has already been explained in FIG. 3, a detailed explanation will be omitted. , and an offset figure correction means S.

The offset graphic modification means S3 performs an offset graphic element search pointer initialization step 831, an offset graphic element search pointer addition step 832, and determines whether there is an offset graphic element that intersects with the offset graphic element indicated by the pointer. An offset graphic element intersection check step S34 for checking the intersection check result, an intersection presence/absence determination step S34 for selecting the next step by determining the intersection check result, and a continuous offset graphic element group between two intersecting offset graphic elements. , when using the offset graphic element indicated by the search pointer as a reference, determine whether the abnormal graphic element is clockwise or counterclockwise by checking the orientation of the offset graphic element and the corresponding pre-offset graphic element. An abnormal graphic element erasing step S35 in which a group of abnormal offset graphic elements is deleted based on whether the orientations of the offset graphic elements and The process is comprised of an intersecting graphic element updating step S36 and an offset graphic element search completion determination step S37 for determining whether the search for offset graphic elements has ended.

Now, the figure element alignment means S1 and the offset figure creation means S2 create a figure 2 after the offset, which is offset by an offset amount d from the figure 1 before the offset shown in FIG.

Next, the offset figure is corrected by the offset figure modifying means S according to the following procedure.

First, offset graphic element search pointer initialization step S3
1 is initialized by storing 0 in the offset graphic element search pointer. Next, the pointer is set to 1 by the offset graphic element search pointer addition step S3□.
is added.

Therefore, the value of the pointer at the current moment is 1, which means that it is indicated by the offset graphic element 2b in FIG.

Next, in the offset graphic element intersection check step S33, an initial value 0 is first stored in the intersecting graphic element position buffer. Then, whether or not there is an offset graphic element that intersects with the offset graphic element 2b is checked clockwise in the order of the graphic elements 2c, 2d, etc. next to the offset graphic element 2b, and the first offset graphic element that intersects with the offset graphic element 2b is checked. 2e is detected, the value of the pointer of the offset graphic element is registered in the intersecting graphic element position buffer. Therefore, 4 is set in this buffer at this time.

Further, in the crossing presence/absence determining step S34, since a value other than 0 is stored in the crossing graphic element position buffer, it is determined that there is a crossing, and the process branches to the abnormal graphic element erasing step S35.

When the buffer is 0, it is determined that there is no intersection, and the process branches to offset graphic element search end determination step S37.

In the abnormal graphic element erasing step S35, the offset graphic element groups 2c and 2d between the offset graphic element 2b indicated by the offset graphic element search pointer and the offset graphic element 2e indicated by the intersecting graphic element position buffer are deleted. Graphic element 1 before offset corresponding to each
Check the direction with c and ld.

If figures 1 and 2 are both clockwise, the figure element IC
, 2C are in the same direction, but 1.1d and 2d are in opposite directions. Since graphic elements in the opposite direction exist, the graphic element groups 2c and 2d including the graphic element 2d in the opposite direction are deleted.

If there is no graphic element in the opposite direction in the graphic element group for which the direction was checked, then the graphic element group for which the direction was not checked (in this case, the offset graphic element 2f
, 2g, 2h, 2a) are deleted.

Next, in the intersecting presence/absence determination step S36, for the intersected graphic elements 2b and 2e, the end point of the graphic element 2b indicated by the offset graphic search pointer is set to the intersection point PT, and the graphic element indicated by the intersecting graphic element position buffer is 2e
The start point of is replaced with the intersection point PT9, the offset graphic element is recreated, and the process branches to an offset graphic element intersection check step S33.

In the offset graphic element search completion determination step S37, it is determined whether the search for all offset graphic elements has been completed based on the value of the offset graphic search pointer, and if the search has not been completed, the offset graphic element search pointer addition step S31 The process branches to , and if the search is completed, the process ends.

In the example of FIG. 2, there is no intersecting position P T 9 L, so the offset graphic elements are not deleted or changed except for the processing described above, and the paths PT, PT, PT9 . A figure indicated by PT6°PT,, PT, is created.

[Effects of the Invention] As is clear from the above description, the present invention is configured to automatically detect offset graphic elements for which an offset amount cannot be secured using a computer, and to delete the abnormal offset graphic element group. This provides an excellent effect in that an offset figure can be created in which a requested offset amount is secured even if the offset amount is relatively large with respect to the figure before offset.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of an offset figure creation method showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of an offset figure created by the flowchart of FIG. 1, and FIG. 3 is a conventional flow chart. FIG. 4 is an explanatory diagram of the offset figure. 1... Figure before offset, 2... Figure after offset, 1 a, 1 b, ---, 2 a, 2 b-.
- Graphic element, Sl... Graphic element alignment means, Sl... Offset figure creation means, S3... Offset figure correction means. Figure 2 O Flash

Claims (2)

[Claims] (1) In a computer-based offset figure creation method for a figure composed of figure elements such as continuous line segments and circular arcs,
A figure element arrangement means for arranging each figure element constituting a figure before offset in the order of connection in the clockwise direction of the figure, and a figure element arrangement means that calculates the intersection point of two adjacent figure elements after offset to sequentially create offset figure elements and arrange them continuously. An offset figure creation means for creating an offset figure, and an offset figure correction means for determining whether or not there is an abnormality in some figure elements of the created offset figure, and correcting the figure element in that part if there is an abnormality. An offset figure creation method characterized by the following. (2) The offset figure modification means performs an offset figure element search pointer initialization step, an offset figure element search pointer addition step of sequentially adding 1 to this pointer, and a post-offset figure element indicated by this pointer. an offset graphic element intersection check step in which it is checked whether there is a post-offset graphic element that intersects; an intersection presence/absence judgment step in which the next step is selected based on the result of this intersection check; and if there is an intersection, it is determined that it is abnormal and the intersection is In consecutive offset graphic elements between two offset graphic elements, compare whether the offset graphic indicated by the search pointer is clockwise or counterclockwise with respect to the corresponding pre-offset and post-offset graphic elements. If there is a graphic element in the direction, the intersecting offset graphic elements are judged to be abnormal, and an abnormal graphic element erasing step of erasing the group of abnormal offset graphic elements is performed. Claim 1, characterized in that the method comprises an intersecting graphic element update step of re-creating a figure as an end point, and an offset graphic element search termination determining step of determining whether the search for an offset graphic element has ended. How to create offset shapes.