JP3246952B2 - CAD processing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CAD (computer-aid)
More particularly, the present invention relates to a CAD processing method and apparatus for selecting and instructing and inputting points in drawing data when creating and editing a drawing in a CAD system.

[0002]

2. Description of the Related Art In a CAD system, when a drawing is created and edited, various drawing and editing commands are used.
A point is selected and input in the drawing data. The points to be selected for such points include, for example, arbitrary coordinate points, significant points related to already created graphic elements, and grid points (intersection points of grids) set on the screen. The significant points include existing points and other significant points. The existing point is a point registered in the drawing data as a point related to an already created graphic element, such as a point element itself, an end point of a straight line element, and a center point of a circle element. Other significant points are:
For example, there is an intersection of two linear elements.

At the time of selecting a point, basically, for example, a mode for selecting an existing point, an arbitrary point, a grid point, a last designated point, an intersection, a point on an element, and the like is set. Select each point individually. Depending on the system, an existing point, an intersection point, and a point on an element and an arbitrary point related to existing data are automatically selected according to a predetermined priority and a positional relationship around a cursor. For automatic recognition mode.

An automatic recognition mode for point selection in a conventional system will be briefly described. As the cursor, for example, a cross cursor of ten characters is used, and a square area (x) determined by the maximum and minimum values x _MAX and x _MIN of the X coordinate and the maximum and minimum values y _MAX and y _MIN of the Y coordinate of the cross cursor is used. _MAX , _yMAX )-( _xMAX , _yMIN )-
(X _MIN , y _MIN )-(x _MIN , y _MAX ) is set as the cursor area. In the cursor area designated by such a cursor, a point closest to the cursor designated point is searched according to a predetermined priority and a corresponding point is selected.

In the automatic recognition mode of such a conventional system, the priority of the point selection is, for example, “existing point” →
The order was “intersection point” → “point on element” → “arbitrary point”. That is, in the cursor area, first search for "existing point", and if "existing point" is found, "existing point" closest to the cursor designated point is selected, and if "existing point" is not found, "intersection point" Search for. When the "intersection" is searched and the "intersection" is found, the "intersection" closest to the cursor designated point is selected. If the "intersection" is not found, the element is searched. If the cursor area covers an element, the "point on the element" closest to the cursor point is selected. If the cursor area does not cover the element, the cursor point is selected as "arbitrary point".

[0006]

As described above, in the conventional CAD system, the priority of point selection in the automatic recognition mode of point selection is "existing point" → "intersection point" →
The order was "point on element" → "arbitrary point". For this reason, it is difficult to select the "intersection point" in the automatic recognition mode of the point selection, and the operability is reduced when the figure becomes complicated.

That is, in the automatic recognition in the conventional system, the "existing point" has a higher priority and the significant points other than the "existing point" in the cursor area are closer to the cursor designated point than the "existing point". Even if an "intersection" exists, if an "existing point" exists in the cursor area, the closest one of the "existing point" has been selected. For example, even if the operator tries to select the "intersection point", the "existing point" is selected in the automatic recognition. In such a case, the point selection must be changed to the intersection selection mode to perform the point selection. As described above, the operation in the automatic recognition mode often differs from the operator's intention, and in such a case, the operability of the point selection operation is significantly reduced.

The present invention has been made in view of such circumstances, and improves an automatic recognition selection operation in point selection to enable appropriate automatic selection according to a point selection situation in actual use. An object of the present invention is to provide a CAD processing method and apparatus capable of improving operability of point selection.

[0009]

According to the CAD processing method of the present invention, when an editing command is input in a CAD system, a selection point is set as a selection point in relation to the editing command.
A specific point selection mode in which point selection is performed by specifying a specific type of point
The de the selected point and the mode setting step of selectively setting an automatic recognition mode for selecting points automatically recognizes, on the display screen of the drawing data is displayed, the cursor for indicating a coordinate point operator a cursor display step of displaying a movable in response to the operation, the selection instruction step of instructing a point selected by the operation of the operator, before
When point selection is instructed in the specific point selection mode
Include significant points, including existing points and intersections on the drawing data.
That is, when a point of a specified specific type is selected and point selection is instructed in the automatic recognition mode, the most significant point including the existing point and the intersection on the drawing data is located at the cursor position at that time. It is characterized by having a point selection step of selecting a close significant point and a point input processing step of processing the selected significant point as an input point.

[0010] The CAD processing apparatus according to the present invention provides an editing frame.
In a CAD processing apparatus which creates and edits a drawing by inputting a command, a drawing display means for displaying drawing data on a display screen, and interactive operation of the display screen, the identification as a selected point in relation to the editing command Seeds
Specific point selection mode and selection for selecting points by specifying a kind of point
And the automatic recognition mode for selecting automatically recognizes the point the point
Mode setting means for selectively setting a cursor, cursor display means for displaying a cursor indicating a coordinate point on a display screen on which drawing data is displayed in a movable manner in accordance with an operation of the operator, selection instructing means for instructing a point selected by the operation, the
When point selection is instructed in the specific point selection mode,
Of the significant points including the existing points and intersection points on the drawing data,
When a point of a specified type is selected and point selection is instructed in the automatic recognition mode, the significant point closest to the cursor position at that time among the significant points including the existing points and intersections on the drawing data It is characterized by comprising point selection means for selecting points and point input processing means for processing the selected significant points as input points.

[0011]

According to the CAD processing method and apparatus of the present invention, when inputting coordinate points on drawing data in a CAD system, a specific type of point is designated as a selected point.
Point selection mode and point selection
And automatic recognition mode for selecting points
Then , on a display screen on which the drawing data is displayed, a cursor for designating a coordinate point is displayed as being movable in accordance with the operation of the operator, and specified by the operation of the operator.
When point selection is specified in point selection mode, the drawing
Of the significant points including existing points and intersection points on the data,
Selected point of the specified type, and when point selection is instructed in the automatic recognition mode, among the significant points including the existing point and the intersection on the drawing data, select the nearest significant point, since the process as an input point, improves put that election択動operation point selection, appropriate select becomes possible in accordance with the point selection condition of actual use, the operation of the point selected The performance is improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a CAD system according to an embodiment of the present invention. In the CAD system according to the present embodiment, when performing automatic selection of point selection on drawing data, significant points other than existing points, for example, intersection points are given almost the same priority as existing points, and the intersection points and existing points are set in the cursor area. When both are present, a function is provided for selecting the one closer to the cursor designated point.

The CAD system shown in FIG. 1 includes a CAD processing section 1, an input device 2, a display 3, an output device 4, and a storage device 5. CAD processing unit 1 includes a CPU
(Central processing unit) (not shown), and performs CAD processing including editing processing and automatic recognition processing in point selection. The input device 2 includes an operation input device such as a keyboard and a pointing device such as a mouse, and inputs operation input information by an operator and other external information necessary for CAD processing to the CAD processing unit 1. The display 3 displays necessary information such as image information processed by the CAD processing unit 1 and information related to input by the input device 2. The output device 4 includes a plotter or a printer,
The processed image information by the CAD processing unit 1 is output as a hard copy. The storage device 5 includes a disk device such as a hard disk device, and operates in association with the CAD processing unit 1 to store data such as image information before processing, after processing, and during processing as needed. .

In this case, the CAD processing unit 1
In addition to the configuration for performing the D processing, the display control unit 1 for performing the automatic recognition point selection processing according to the embodiment of the present invention.
1, a cursor display control unit 12, a mode setting unit 13, an editing processing unit 14, a point selection processing unit 15, a memory 16, and a point input processing unit 17. The display control unit 11 controls display on the display 3. Under the control of the display control unit 11, drawing data and the like are displayed on the screen of the display 3.

The cursor display control unit 12 includes the display control unit 1
A cursor that can display a cursor area, such as a cross cursor, is displayed on the screen of the display 3 via the display unit 1 and the cursor is displayed on the screen of the display 3 in response to an operation of the pointing device or the like of the input device 2 by the operator. To move. The size of the cursor area indicated by the cursor displayed by the cursor display control unit 12, for example, the size of the cursor area determined by the size of the cross of the cross cursor can be arbitrarily set in advance as desired. it can. Mode setting unit 13
Performs a process for the operator to set the point selection mode including the automatic recognition mode as desired by, for example, interactive operation with the screen of the display 3. For this reason, the mode setting unit 13 controls the display control unit 11 as necessary.

The edit processing unit 14 includes, for example, the display 3
An interactive operation by the operator with the screen of (1) performs editing processing such as drawing / editing of drawing data displayed on the display 3 and stored in the memory 16. For this reason,
The editing processing unit 14 extracts the drawing data stored in the memory 16 as needed, and controls the display control unit 11. In the course of the editing processing by the editing processing unit 14, point selection is performed, for example, for specifying an end point of a created graphic or the like.

The point selection processing section 15 functions at least in connection with drawing and editing by the editing processing section 14, and interactively with the screen of the display 3, for example, according to the point selection mode set by the mode setting section 13. An input point selection process is performed according to an operator's instruction by the operation. When the mode setting unit 13 sets the automatic recognition mode, the point selection processing unit 15 searches for a significant point other than an existing point in the cursor area, for example, an intersection and an existing point. Exists, the significant point in the cursor area, that is, the point closest to the cursor designated point among the existing points and the intersection points is selected. In this case,
If the existing point and the intersection point are equidistant from the cursor designated point in the cursor area, and these points are closest to the cursor designated point, the intersection is preferentially selected. However, as the intersection in this case, the intersection on the extension of the element is not targeted for automatic recognition. This point selection processing unit 15 also extracts drawing data stored in the memory 16 as necessary.

The memory 16 stores information including CAD drawing data to be displayed by the display control unit 11. The contents stored in the memory 16 are transferred to the storage device 5 as needed. This memory 16 may share a memory used in various normal CAD processes in the CAD processing unit 1. The point input processing unit 17 inputs the point selected by the point selection processing unit 15 into the drawing data displayed on the display 3 and stored in the memory 16 as a designated point of the editing process.

Next, the operation relating to the automatic recognition of the point selection in the CAD system having such a configuration will be described in detail with reference to the flowchart shown in FIG. The processing shown in FIG. 2 is an interrupt for point selection during normal drawing / editing operation by the editing processing unit 14 when the automatic recognition mode is set as a point selection mode by the mode setting unit 13 in the CAD system. It is assumed to be started as a process.

In selecting points in the automatic recognition mode,
First, an operator moves a cursor, for example, a cross cursor displayed on the screen of the display 3 to a position near a desired selection point via a mouse or the like of the input device 2 (step S1). At this time, the desired selection point is an intersection point or an existing point as a significant point, and the cursor is moved so as to be a significant point closest to the cursor designated point in the cursor area (that is, the cross point of the cross cursor). . When the cross cursor is positioned near the desired selection point, the operator operates a click button or the like of the mouse of the input device 2 to instruct point selection (step S2).

In step S2, when point selection is instructed,
The point selection processing unit 15 performs a point selection process by automatic recognition (step S3). In step S3, the significant point in the cursor area indicated by the cross cursor at that time,
In this case, the intersection and the existing point are searched, and
If there are more than two intersections and existing points in the cursor area, the significant point closest to the cursor point is selected as the selected point, and the significant point closest to the cursor point in the cursor area is equidistant from the cursor point. In the case of the intersection and the existing point, the intersection is prioritized over the existing point as the selected point. In step S3, if there are a plurality of significant points of the same type closest to the cursor pointing point, the priority is determined according to a preset appropriate priority order, for example, the registration (generation) order of those significant points. However, the cursor should be designated so that a plurality of significant points of the same type closest to the cursor designated point do not exist.

When a significant point is selected in step S3, the selected point is displayed by the point input processing unit 17 on the screen of the display 3 and edited by the editing processing unit 14 with respect to the drawing data stored in the memory 16. (Step S4). When a selection point is input in step S4, it is determined in the editing process whether or not there is another point to which an instruction should be input (step S5).
The automatic recognition point selection processing is completed, and if there is another point to which an instruction should be input, the process returns to step S1 and the above processing is repeated.

Here, an example of a specific operation in this system will be described in detail. First, an editing command such as drawing of a straight line, a circle, or the like, or copying, moving, etc. is input using a menu or the like on an editing screen of the CAD system, and a point selection mode related to the command is set. This point selection mode includes automatic recognition, existing points, arbitrary points,
There are a grid, a final point, an intersection, a point on the element, a midpoint, an absolute coordinate, a relative coordinate, an angle and a distance, a center point, and the like.
It can be set at any time before and after the input of the edit command. In this case, the point selection mode is
Automatic recognition is selected.

In this state, for example, when a point selection is instructed by a cross cursor to input an end point in a straight line drawing, the point selection processing unit 15 makes the intersection point and the existing point substantially the same as follows. Is selected as the priority of the automatic recognition. If one or more intersection points and existing points exist in the cursor area, the point closest to the cursor designated point is selected. If one or more intersections and existing points exist in the cursor area, and each one of the intersections and the existing point is closest to and the same distance from the cursor designated point, the intersection is selected. .

A specific example will be described with reference to FIGS. (1) As shown in FIG. 3, the cross cursor C simultaneously designates the cursor designated point C0 and the cursor area C1.
Significant points in the cursor area C1 are represented by straight lines L1 and L2.
And an existing point P1. In FIG. 3, since the existing point P1 is closer to the cursor point C0 than the intersection point M1, the existing point P1 is selected by the automatic recognition point selecting process. (2) In FIG. 4, the cursor area C of the cross cursor C
Significant points in 1 are two points, the intersection M2 of the straight lines L3 and L4, and the existing point P2. In FIG. 4, the existing point P2
Since the intersection M2 is closer to the cursor designated point C0 than the intersection M2, the intersection M2 is selected by the automatic recognition point selecting process.

(3) In FIG. 5, the significant points in the cursor area C1 of the cross cursor C are two points: the intersection M3 of the straight lines L5 and L6 and the existing point P3. In FIG. 5, from the cursor designated point C0 to the intersection M3 and the existing point P3
Since the distances are equal, the intersection M3 is selected by the automatic recognition point selection processing. When a plurality of intersections or a plurality of existing points are closest and at the same distance from the cursor designated point in the cursor area, any one of the intersections or the existing points is selected. In this case, which intersection among the plurality of intersections or which existing point among the plurality of existing points is respectively selected may be appropriately set in advance according to the convenience of a database or the like of each point. Alternatively, any one of them may be selected at random. Rather, when performing cursor pointing, the cursor pointing point should be closest to the intersection or existing point that you want to select.

Further, the significant points to be selected in the case of automatic recognition do not include intersections in extension. That is, FIG.
As shown in the following, the intersection of the straight lines L7 and L8 on the extension is
In the automatic recognition mode, even when the cross cursor C is instructed to enter the cursor area, the straight line L7
Intersections on the extension of L8 and L8 are ignored, and the end point P4 of the straight line L7, which is an existing point in the cursor area, is selected. Incidentally, in the intersection selection mode for selecting only the intersection instead of the automatic recognition mode, as shown in FIG. 7, an instruction by the cross cursor C is made so that the intersection on the extension of the straight lines L7 and L8 is within the cursor area. If so, an intersection M4 on the extension of straight lines L7 and L8 is selected.

As described above, in the automatic recognition mode of the point selection, the automatic selection is performed in the priority order corresponding to the reality, so that the operability of the point selection in the automatic recognition is remarkably improved, and the operability of the CAD system itself is improved. It also contributes to the improvement of
The present invention is not limited to the above-described embodiment, and can be implemented with various modifications. For example, as the significant points other than the existing points to be selected by the point selection processing unit 15 (that is, step S3), in addition to the intersections, the contact points and the vertices are treated with almost the same priority. Is also good. Also, the cursor is not limited to the cross cursor, and may be any cursor as long as it can indicate a cursor designated point and a cursor area including the cursor designated point. The size of the cursor area is not necessarily made variable, and may be set as a fixed size so that the setting cannot be changed.

[0029]

As described above, according to the present invention, C
When inputting coordinate points on drawing data in the AD system, point selection is performed by specifying a specific type of point as a selected point.
Select specific point selection mode and select points automatically
And an automatic recognition mode for making a selection can be selected. On a display screen on which drawing data is displayed, a cursor indicating a coordinate point is displayed as movable in accordance with an operator's operation, and a specific point is specified by the operator's operation. Selection mode
When point selection is instructed in the
Of the significant points including existing points and intersection points,
When a point of type is selected and point selection is instructed in the automatic recognition mode, a significant point closest to the cursor position at that time is selected from among significant points including existing points and intersection points on the drawing data. , so as to process an input point, to improve that election択動work put the point selected, to enable the appropriate selected in accordance with the point selection condition of actual use, it can improve the operability of the point selected A CAD processing method and apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a CAD system in which a CAD processing apparatus according to an embodiment of the present invention is incorporated.

FIG. 2 is a flowchart illustrating a schematic operation of the CAD system of FIG. 1;

FIG. 3 is a view schematically showing a state of a display screen for explaining a schematic operation of the CAD system of FIG. 1;

FIG. 4 is a view schematically showing a state of a display screen for explaining a schematic operation of the CAD system of FIG. 1;

FIG. 5 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system of FIG. 1;

FIG. 6 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system of FIG. 1;

FIG. 7 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system of FIG. 1;

[Explanation of symbols]

1. CAD processing unit 2. Input device 3. Display 3.
4 output device, 5 storage device, 11 display control unit, 12
... Cursor display control unit, 13 ... Mode setting unit, 14 ... Edit processing unit, 15 ... Point selection processing unit, 16 ... Memory, 17 ...
Point input processing unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 17/50 G06F 3/14-3/153 G06T 11/80

Claims (14)

(57) [Claims] When inputting an editing command in a CAD system, a specific type of selection point is selected as a selection point in connection with the editing command.
Automatic recognition mode and the selection for selecting points to automatically recognize a selected point with a particular point selection mode in which the selected point by specifying a point
A mode setting step for selectively setting, a cursor display step for displaying a cursor indicating a coordinate point on the display screen on which the drawing data is displayed so as to be movable in accordance with an operator's operation, and a point selection by the operator's operation And when a point selection is instructed in the specific point selection mode.
Include significant points, including existing points and intersections on the drawing data.
That is, when a point of a specified specific type is selected and point selection is instructed in the automatic recognition mode, the most significant point including the existing point and the intersection on the drawing data is located at the cursor position at that time. A CAD processing method, comprising: a point selecting step of selecting a close significant point; and a point input processing step of processing the selected significant point as an input point. 2. The CAD according to claim 1, wherein the point selecting step is a step of preferentially selecting the intersection when the existing point and the intersection as significant points are present at the same distance from the cursor. Processing method. 3. The CAD processing method according to claim 1, wherein the point selecting step is a step of processing contact points and vertices as significant points in addition to the existing points and intersection points. 4. The point selecting step includes the steps of:
2. The CAD processing method according to claim 1, wherein the step is not performed as a significant point. 5. The cursor display step according to claim 1, wherein a cursor indicating a center point and a predetermined cursor area near the center point is displayed.
The CAD processing method according to any one of the above items. 6. The CAD according to claim 5, wherein the cursor displaying step includes a step of changing and setting a size of a cursor area in accordance with an operation of an operator.
Processing method. 7. The CAD processing method according to claim 5, wherein the point selecting step is a step of selecting a significant point only within the cursor area. 8. A drawing is created by inputting an editing command.
In CAD processing apparatus for editing a drawing display means for displaying the drawing data on a display screen, an interactive operation with the display screen, the editing commands
Point selection by specifying a specific type of point as a selection point in relation to
Select specific point selection mode and select points automatically
Display mode setting means for selectively setting the automatic recognition mode for the-option, on a display screen drawing data is displayed, as can move the cursor to indicate the coordinate points in accordance with operation of the operator Cursor display means for causing the operator to select a point by operating the operator; and when point selection is instructed in the specific point selection mode.
Include significant points, including existing points and intersections on the drawing data.
That is, when a point of a specified specific type is selected and point selection is instructed in the automatic recognition mode, the most significant point including the existing point and the intersection on the drawing data is located at the cursor position at that time. A CAD processing apparatus comprising: point selecting means for selecting a near significant point; and point input processing means for processing the selected significant point as an input point. 9. The method according to claim 8, wherein the point selecting means includes means for preferentially selecting the intersection when the existing point and the intersection as significant points are present at the same distance from the cursor. CAD processing equipment. 10. The CAD processing apparatus according to claim 8, wherein the point selecting means includes means for processing a contact point and a vertex as significant points in addition to the existing points and intersection points. 11. The method according to claim 8, wherein the point selecting means does not regard the intersection on the extension line as a significant point.
3. The CAD processing apparatus according to 1. 12. The cursor display means includes means for displaying a cursor indicating a center point and a predetermined cursor area near the center point.
2. The CAD processing device according to claim 1. 13. The CA according to claim 12, wherein the cursor display unit includes a unit for changing and setting a size of a cursor area in accordance with an operation of an operator.
D processing equipment. 14. The CAD processing apparatus according to claim 12, wherein the point selecting means includes means for performing a process of selecting a significant point only in a cursor area.