JPH05210726A - Method for correcting image - Google Patents

Abstract

PURPOSE:To facilitate correction work in the case of extending or contracting the 2nd line element having its end point on the 1st line element at the time of changing the position of the 1st line element. CONSTITUTION:An element specifying means 1 specifies a line element to be corrected. The means 1 spescifies the 1st line element after changing its position and the end point of the 2nd line element which is extended or contracted up to the 1st line element. An intersection point calculating means 2 calculates an intersection point between the 1st and 2nd line elements specified by the means 1 as a new end point of the 2nd line element and rewrites the contents of an element data base 3 and a point data base 4. A display means 5 displays formed and corrected drawing data and drawing correcting cursor or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image correction method in a CAD system or the like, and more particularly, when a position of a first line element composed of a straight line, a circle, an ellipse, a free curve or the like is changed, it has an end point on the line element. The present invention relates to an image correction method when extending or shortening a second line element.

[0002]

2. Description of the Related Art In a CAD system, when a drawing is corrected by moving a predetermined line segment, it may be necessary to correct another line segment having an end point on the line segment. The conventional CAD system has a function of designating a plurality of end points P1 to P5 and moving them by a designated vector v as shown in FIG. 11B, as shown in FIG. Things are known.

[0003]

On the other hand, in this type of correction work, as shown in FIG. 12A, for example, as the line element L10 moves in the vector v direction, the endpoints on the line element L10 are moved. Other line elements L11 and L12 having
It may be necessary to modify the direction along the straight line or the curved line, not the vector v direction, to extend as shown by the dotted line in FIG. 12B. In such a case, since correct correction is not possible in the above-described point movement processing, conventionally, the line elements L11 and L12 have to be rewritten, which causes a problem that the drawing correction work is extremely troublesome. there were.

The present invention has been made in view of the above problems, and when the position of the first line element is changed and the second line element having an end point on the line element is extended or contracted, It is an object of the present invention to provide an image correction method capable of facilitating the correction work and significantly reducing the burden on the operator.

[0005]

SUMMARY OF THE INVENTION An image correction method according to the present invention includes image data including a first line element and a second line element having at least one endpoint on the first line element. On the other hand, in the image correction method of correcting the end points of the second line element in accordance with the position change of the first line element, a step of designating one or more end points of the second line element to be moved From the step of designating the relocated first line element, the information identifying the second line element having the designated endpoint, and the information identifying the designated first line element. Calculating the intersection of the two and using the obtained intersection as a new end point of the second line element to extend or contract the second line element.

[0006]

According to the present invention, when the position of the first line element is changed and the position of the end point of the second line element whose end point is on the first line element is changed, the following operation is performed. All you have to do is operate. That is, first, the end points of one or a plurality of second line elements to be moved are designated. Next, the relocated first line element is designated. A method of designating the end point of the second line element and the first line element in the reverse order of the above may be used. When the end point of the second line element and the first line element are specified, information specifying the second line element having the specified end point, for example, a function and the specified first line element are specified. The intersection of the two is calculated from the information to be obtained, and the obtained intersection is registered as a new end point of the second line element. This causes the second line element to extend or contract along the line to the first line element.

As described above, according to the present invention, after the position of the first line element is corrected, the end point of the second line element to be moved and the moved first line element are simply designated. Since the second line element is extended or shortened to the first line element, the image correction work is extremely easy and the operator's burden is significantly reduced. Also, if the end points of the plurality of second line elements to be moved are collectively designated,
Image modification work becomes easier.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a functional block diagram of a CAD system for realizing an image correction method according to an embodiment of the present invention.

This system comprises an element designation means 1, an intersection calculation means 2, an element database 3, a point database 4 and a display means 5. The element designating means 1 is composed of a pointing device such as a mouse and is for specifying a line element to be modified. The element designating unit 1 designates the end point of the first line element after the position change and the end point of the second line element that extends or contracts the end point up to the first line element. The intersection point calculation means 2 calculates the intersection point of the first line element and the second line element designated by the element designation means 1 as a new end point of the second line element, and the element database 3 and the point database 4 Rewrite the contents of. The display means 5 displays the created and modified drawing data, a cursor for drawing modification, and the like.

FIG. 2 is a diagram showing the contents of the element database 3 and the point database 4. The element database 3 is a database for registering graphic elements (including line elements) forming the created drawing, and is composed of element names, data, flags and the like. The element name stores a name that identifies each straight line element, curved line element, or the like. In the data, data indicating both end points (straight line) and data indicating the center point, major axis, minor axis (circle and ellipse), etc. are stored. The index of the point database 4 is stored in the point data, and the xy coordinates of the point are stored in the point database 4. As a result, it is possible to reduce the storage capacity of the database when a plurality of elements share an end point or a center point. Further, in the point database 4, a flag is stored so as to correspond to each coordinate data. The flag stores information indicating whether the element is currently designated by the element designating unit 1. The intersection point calculating means 2 corrects the content of the data of the end point whose flag is "1".

Next, the operation of the present system thus constructed will be described. Here, as an example, as shown in FIGS. 3 and 4, an element to be moved by designating an edit mode is specified, and the straight line L0 is moved to the right in the figure, and then the arc C1
The procedure for extending both end points of the line and the end points of the straight lines L1 and L2 on the straight line L0 side to the straight line L0 will be described. When the projection function is selected from the top screen (not shown), the mode for automatically extending / shortening the end points is set.

FIG. 5 is a flow chart showing the operating procedure and operation in this mode, and FIGS. 6 to 9 are diagrams for explaining this operation. First, the moving end point is designated (S1).
That is, as shown in FIG. 6, a message "please point to move." Is displayed on the prompt line PL in the display screen of the display means 5, so that single designation (end points are individually designated) is performed. Or multi-designate (designate multiple end points collectively).

When the multi is specified, the menu shown in FIG. 7 is displayed. Select "in the fence" here,
When "Specify" is selected, the rubber band cursor A shown
´ is displayed. Then, operate the element designating means 1,
The range S is designated by sequentially designating two diagonal points. As a result, the end points of the arc C1 located inside the specified range S and the end points of the straight lines L1 and L2 on the straight line L0 side are selected as the end points to be changed. When this end point is designated, a flag is set to the corresponding end point of the point database 4, and it becomes possible to identify which end point has been selected. Next, the destination element is designated (S2). That is, as shown in FIG. 8, the message "Please specify the destination element." Is displayed on the prompt line PL in the display screen of the display means 5, and the cursor A is displayed using the element designating means 1. To the top of the destination element L0 and select "execute". The selected destination element is passed as an argument of the intersection calculation means 2.

When the end point to be changed and the destination element are selected, the intersection calculation means 2 selects the selected elements L0, L1,
The intersection of the element L0 and the elements L1 and L2 is recalculated from the function that specifies L2 (S3). When the intersection is not calculated from the calculation result, an error display to that effect is displayed and the process is terminated (S4, S6). If the intersection is calculated, the end point is changed and the process ends (S
4, S5). As a result, the data in the point database 4 is changed. For example, as shown in FIG. 10, in the case of the straight line element L1, the coordinates of the end point P2 are changed from (x2, y2) to (x2 ', y2'). For example, in the case of the arc element C1, the coordinates of both end points P3 and P4 are (x3, y
3), (x4, y4) to (x3 ', y3'), (x4
′, Y4 ′). Then, the flag of the element whose end point has been changed is reset to "0".

By executing the above-mentioned processing, it is possible to execute the extension and contraction processing of the element having the end point on the element by a simple operation when the arbitrary element moves. Note that the elements targeted by this processing are not limited to the above-described straight lines and arcs, and elements such as elliptic arcs, hole arcs, free-form curves, leaders (leader lines for reference symbols), etc. may also be targeted. it can. In the case of a free curve, a method of extending a line along the inclination near the end point may be adopted.

[0016]

As described above, according to the present invention, after correcting the position of the first line element, the end point of the second line element to be moved and the moved first line element are set. Since the second line element is extended or shortened to the first line element only by designating, the image correction work becomes extremely easy,
The burden on the operator can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a main part of a CAD system for realizing an image correction method according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining contents of an element database and a point database in the system.

FIG. 3 is a schematic diagram of a display screen for explaining the operation of the system.

FIG. 4 is a schematic diagram of a display screen for explaining the operation of the system.

FIG. 5 is a flowchart showing an operation of the system.

FIG. 6 is a schematic view of a display screen for explaining the operation of the system.

FIG. 7 is a schematic diagram of a display screen for explaining the operation of the system.

FIG. 8 is a schematic diagram of a display screen for explaining the operation of the system.

FIG. 9 is a schematic diagram of a display screen for explaining the operation of the system.

FIG. 10 is a diagram showing the contents of a point database after the end points are changed in the system.

FIG. 11 is a diagram for explaining a conventional image correction method.

FIG. 12 is a diagram for explaining a conventional image correction method.

[Explanation of symbols]

1 ... Element designating means, 2 ... Intersection calculation means, 3 ... Element database, 4 ... Point database, 5 ... Display means.

Claims (1)

[Claims] 1. The position change of the first line element is performed for image data including a first line element and a second line element having at least one end point on the first line element. Accordingly, in the image correcting method for correcting the end points of the second line element, the step of designating one or more end points of the second line element to be moved, and the position-changed first line element The step of designating, the intersection point of the two is calculated from the information identifying the second line element having the designated end point and the information identifying the designated first line element, and the obtained intersection point is defined as A step of extending or shortening the second line element as a new end point of the second line element.