JPH06208594A - Method and device for preparing large circular arc diameter dimension - Google Patents

Abstract

PURPOSE:To easily prepare a large circular arc diameter dimensional line and to easily execute distinguishing use between one-point folded large circular arc diameter dimension and two-point folded large circular arc dimension. CONSTITUTION:A circular arc point indicating part 13 lets an operator indicate a circular arc point on a circumference. A refraction point indicating part 14 lets the operator sequentially indicate the 1st and 2nd refraction points. A center point indicating part 15 lets the operator indicate a false center point. At this time a straight element is displayed between already indicated indication points and a straight cursor to be moved/extended/contracted following the position of a cursor is displayed between a start point and the point cursor with an indication point indicated just before as a start point. A write control part 17 writes lighting dimensional line data on drawing data displayed on a display 3 and stored in a memory 16 in accordance with the already indicated circular arc point, refraction point and false center point position after indicating the false center point or at the time of executing interrupting operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to CAD (computer-aid).
The present invention relates to an ed design) system, and more particularly, to a large arc diameter dimension creating method and apparatus for writing a line shape of a large arc diameter dimension (or final dimension) in a drawing data created by a CAD system.

[0002]

2. Description of the Related Art Some CAD systems have a function for easily writing a large arcuate diameter dimension line in the shape of a stripe in drawing data to be created. An example of the large arc diameter dimension writing function in the conventional CAD system will be described. (1) Display the dimension command menu and select the large arc diameter dimension. (2) Specify the passing point of the dimension line on the arc to be measured, that is, the arc point that is the dimension entry point. (3) Since an auxiliary line is displayed from the arc point toward the center of the arc, the first refraction point is indicated on this auxiliary line. (4) A second refraction point is designated at a point deviating from the auxiliary line. (5) Specify the end point of the dimension line. (6) The dimension line and the dimension value are written so that the end of the dimension value is located at the first inflection point.

[0003]

As described above, in the conventional CAD system, it is possible to relatively easily form the large arc-diameter dimension line in the shape of a pin. However, the large arc diameter dimension line that can be automatically created in the conventional CAD system is limited to the large arc diameter dimension line of two-point bending having two inflection points, the first inflection point and the second inflection point. Therefore, it was not possible to automatically create a one-point-folded large arc diameter dimension line having only one refraction point. For this reason,
When it is desired to create a large arc diameter dimension line with one-point bending, it is necessary to draw it directly, and the operation is complicated.
Therefore, it has been complicated to properly use the large arc diameter dimension of one-point bending and the large arc diameter dimension of two-point bending as desired. Depending on the situation of the drawings, there are cases where the large circular arc diameter dimension for one-point bending is appropriate, and there are cases where the large circular arc diameter dimension for two-point folding is appropriate. It is preferable that a complicated operation is forced to use them properly. It wasn't that.

Further, during the creation of the dimension line, only the point cursor, the pointing point, and the auxiliary line from the arc point to the center of the arc are displayed, and the shape of the created dimension line is grasped during the drawing. It was difficult to obtain, and it was not easy to obtain a dimension line having an appropriate shape. On the other hand, it is possible to automatically create a large arc diameter dimension line with one-point break, and to easily perform arbitrary use of a large arc diameter dimension with one-point break and a large arc diameter dimension with two-point break. As a method of creating an arc diameter dimension, when entering a large arc diameter dimension, let the operator designate the arc point that is the dimension entry point on the arc to be measured on the drawing in which the dimension line should be entered, and the dimension for the specified arc point On the drawing data that is displayed and stored, the center point on the line entry is designated, and the refraction point position of the dimension line is designated on the basis of the designated arc point and the center point on the dimension entry. To
It is conceivable to write the data of the large arc-diameter dimension line in the shape of a streak based on the indicated arc point, the center point of the dimension line, and the position of the inflection point.

However, in such a case, when the dimension line is created, the designation order of the designation points is “arc point”,
"Center point", "first inflection point", ("second inflection point")
It is difficult to imagine the shape of the created dimension line in the middle of creating the dimension line because the order of pointing points is not continuous on the dimension line figure. The dimension line could not be obtained easily.
Moreover, since the order of pointing points is not continuous in the dimension line figure, the cursor corresponding to the dimension line figure created in the process of creating the dimension line, that is, in the pointing step of each pointing point is displayed to display the dimension line. It was not easy to understand the shape, and it was not possible to know the status of the dimension line shape while creating the dimension line.

The present invention has been made in view of such circumstances, and it is easy to grasp the dimension line shape in the process of creating the large arc diameter dimension line, and further, the large arc diameter dimension of one-point bending and the two-point bending are possible. It is an object of the present invention to provide a large arc diameter dimension creating method and device which can easily perform arbitrary selection of large arc diameter dimension.

[0007]

A large arc diameter dimension creating method according to the present invention comprises a selecting step for selecting a large arc diameter dimension when a large arc diameter dimension is entered on drawing data in a CAD system. An arc point designating step for designating an arc point which is a dimension entry point on an arc to be measured on the drawing on which the dimension line is to be entered, and a dimension line of the dimension line starting from the arc point designated by the arc point designating step. Displaying and storing a refraction point designating step for designating a refraction point, a center point designating step for designating a center point on the dimension line drawing for the arc point and the refraction point designated by the arc point designating step and the refraction point designating step. The arc point and the inflection point specified by the arc point designating step, the inflection point designating step, and the center point designating step on the drawing data being displayed. And a writing step for writing the data of the large arc diameter dimension line based on the center point position, and the arc point designating step, the inflection point designating step and the center point designating step are performed in addition to the point cursor indicating the cursor designating position. And displaying a linear element between the already pointed pointing points and displaying a linear cursor between the immediately preceding pointing point and the point cursor position.

The large arc diameter dimension creating apparatus according to the present invention is C
In a large arc diameter dimension creating apparatus for entering a large arc diameter dimension on a drawing in an AD system, a command input means for inputting a command including a command for entering a large arc diameter dimension, and at least a command for entering the large arc diameter dimension. Functioning when is input, an arc point indicating means for indicating an arc point that is a dimension entry point on an arc to be measured on the drawing on which a dimension line should be entered, and with the arc point as a starting point, Inflection point instruction means for instructing the inflection point of the dimension line, center point instruction means for instructing the center point on the dimension line entry for the arc point and inflection point, and on the drawing data stored and stored And writing means for writing data of a large arc diameter dimension line based on the indicated arc point, inflection point, and center point position, and the arc point indicating means, In relation to the folding point designating means and the center point designating means, a means for displaying a point cursor indicating a cursor pointing position, a means for displaying a straight line element between the already designated pointing points, and a preceding pointing point and a point. And a means for displaying a linear cursor between the cursor position and the cursor position.

[0009]

In the large arc diameter dimension creating method and apparatus of the present invention, when the large arc diameter dimension is entered on the drawing data in the CAD system, the dimension line is entered when the entry of the large arc diameter dimension is selected. Indicate the arc point that is the dimension entry point on the arc to be measured on the drawing to be drawn, then instruct the refraction point of the dimension line starting from the arc point, and the center on the dimension line entry for the arc point and the refraction point Instruct the point to write the data of the large arc diameter dimension line based on the position of the arc point, the inflection point, and the center point on the displayed and stored drawing data, and make a straight line between the already pointed points. Along with displaying the element, a straight line cursor is displayed between the previous designated point and the point cursor position, so it is easy to grasp the dimension line shape in the process of creating the large arc diameter dimension line, and a large circle with one broken point Any proper use of diameter and a large arc diameter of the broken two points can be easily performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a CAD system incorporating a large arc diameter dimension creating apparatus according to an embodiment of the present invention. In the CAD system of the present embodiment, when drawing a large arcuate diameter dimension line (hereinafter, referred to as "grinary dimension line") in the shape of an arc on the drawing data, the dimension line is to be measured on the drawing. Dimensioning points on an arc,
That is, an arc point is designated, the refraction point position of the dimension line is designated starting from this designated arc point, and further, the center point on the dimension line entry is designated corresponding to these arc points and refraction points, and displayed. And, on the stored drawing data, it is possible to write the data of the one- or two-point broken dimensional line of radius or diameter based on the indicated arc point, inflection point and dimension line center point position. it can.

The CAD system shown in FIG. 1 includes a CAD processing unit 1, an input device 2, a display 3, an output device 4 and a storage device 5. The CAD processing unit 1 is a CPU
A central processing unit (not shown) is included, and CAD processing including large arc diameter dimension creation processing is executed. 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 is a CAD processing unit 1.
Necessary information such as processed image information according to the above, information related to input by the input device 2, and the like are displayed. The output device 4 includes a plotter, a printer, or the like, and outputs the image information processed by the CAD processing unit 1 as a hard copy. Storage device 5
Is a disk device such as a hard disk device or the like, and operates in association with the CAD processing unit 1 to store data such as image information before, after, and during processing as necessary.

In this case, the CAD processing unit 1 uses the normal CA.
In addition to the configuration for executing the D process, the display control unit 11, the command input unit 12, the arc point designating unit 13, and the refraction point designating unit 14 for executing the large arc diameter dimension creating process according to the embodiment of the present invention. , A center point instruction unit 15, a memory 16, a writing control unit 17, an interruption processing unit 18, and an error processing unit 19. The display control unit 11 controls the 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 command input unit 12 performs a process for allowing the operator to input a command including a command for writing the final dimension line by an interactive operation with the screen of the display 3, for example.
Therefore, the command input unit 12 controls the display control unit 11 as necessary.

The arc point designating section 13 functions at least when the entry command of the above-mentioned boundary dimension line is inputted by the command input section 12, and, for example, interactively operates with the screen of the display 3 to display the boundary dimension line. A process for causing an operator to indicate a dimension entry point on an arc to be measured on a drawing to be entered, that is, an arc point is performed. Further, the arc point designating section 13 is
On the screen of the display 3, a point cursor such as a cross-shaped cursor indicating the point position is displayed. The arc point designating section 13
When the circular arc point is designated by the operator, the designated circular arc point is displayed on the screen. Therefore, the arc point designating unit 13 also controls the display control unit 11 as necessary.

The refraction point designating section 14 functions at least in a state where the arc point is designated by the arc point designating section 13, and, for example, by interactive operation with the screen of the display 3, the operator can determine the refraction point of the final dimension line. Processing for instructing is performed. The refraction point designating section 14 sequentially designates the first refraction point and the second refraction point, but in the case of a one-point broken final dimension line, as the second refraction point, the center point on the dimension line entry, that is, the pseudo Specify the point you want to use as the center point. Further, the inflection point designating section 14 displays a point cursor on the screen of the display 3 during the interactive operation, and the arc point designating section 1 during the first refraction point designation.
A linear cursor that moves and expands / contracts in accordance with the position of the point cursor from the arc point designated in 3 up to the point cursor is displayed, and when designating the second inflection point after instructing the first inflection point, A linear element is displayed between the arc point and the first inflection point, and a linear cursor that moves and expands / contracts following the position of the point cursor up to the point cursor starting from the first inflection point already indicated is displayed. To do. Therefore, the arc point designating unit 1
3 also controls the display control unit 11 as necessary.

The center point designating section 15 functions at least in the state where the first and second refraction points are designated by the refraction point designating section 14, and, for example, interactively operates with the screen of the display 3 to draw a dimension line. A process for causing the operator to instruct the pseudo center point that is the center point is performed. Therefore, the center point designating unit 15 also controls the display control unit 11 as necessary. The memory 16 stores information including CAD drawing data to be displayed by the display control unit 11. The stored contents of the memory 16 are transferred to the storage device 5 as needed. The memory 16 may share the memory used in the normal CAD processing in the CAD processing unit 1.

The writing control unit 17 obtains the arc points and the inflection point instruction unit 14 obtained by the arc point instruction unit 13 already instructed on the drawing data displayed on the display 3 and stored in the memory 16. The boundary dimension line data is written according to the pseudo center point position obtained by the inflection point and center point designating unit 15. Interruption processing unit 18
Functions when the input device 2 performs an interrupt operation such as forced input of a higher-order command such as an interrupt command, operation of an interrupt key, or input of a cancel command during the creation of the dimension line, and executes a predetermined interrupt process. To do. This interruption processing unit 18 is in a state in which a predetermined operation related to the creation of a standard two-point broken machinary dimension is not completed (that is, a state in which the instruction of the pseudo center point is not completed), and when interruption occurs. , Recognize that an error has occurred.

The error processing section 19 functions at least when the interruption processing section 18 recognizes the occurrence of an error, and checks whether or not the inflection point of the final size has already been designated.
When at least one inflection point of the final size has been designated, the write controller 17 is operated. In this case, the writing control unit 17 uses the specified dimension line data (arc point, inflection point, etc.) for the final dimension line data,
Writing is performed on the drawing data displayed on the display 3 and stored in the memory 16. Therefore, in the case of the one-dimensional broken dimension line, the writing operation by this error processing is used, and as described above, the point to be the pseudo center point is designated as the second inflection point. If the interrupting operation is performed before the designation of the pseudo center point, the one-point broken dimension of the arc point, the first inflection point, and the second inflection point (actually, the pseudo center point) can be easily created.

Further, in the error processing section 19, the arc point designating section 13 is operated when the element forming the dimension line being created is deleted by a delete key or the like for deleting the element created immediately before. It is also possible to provide a function to perform error processing to return to the instruction of the arc point, which is the first instruction point for creating the final dimension, and when instructing the inflection point, if you try to specify a point outside the arc. May have a function of performing an error processing such that a predetermined error is displayed and the refraction point is instructed again.

Next, with reference to the flow charts shown in FIG. 2 and FIG. 3, the operation of the CAD system having such a structure, particularly for creating a large arc diameter, will be described in detail. It is assumed that the process shown in FIG. 2 is started as an interrupt process by a command input during a normal drawing or editing operation in the CAD system, and the process shown in FIG. 3 is performed when a predetermined interruption operation is performed during the creation of the final dimension. It shall be activated as an interrupt process. First, when the operator selects and inputs a radius or diameter boundary dimension line creation command through the command input unit 12 of the CAD processing unit 1 (step S1), the system sets the radius or diameter boundary dimension line mode. (Step S2).

When the radius dimension or diameter diameter dimension line mode is entered, the arc point designating section 13 of the CAD processing section 1 instructs the operator to specify the arc dimension entry point, ie, the arc point, on the drawing to which the dimension line is to be measured. Is performed (step S3). The instruction of the measurement point on the drawing by the arc point instruction unit 13 is required to be input by the operator via the screen of the display 3, and the operator responds accordingly.
For example, it is performed by performing an instruction operation such as operating a mouse and pressing a click button at a desired point while looking at a point cursor such as a cross-shaped cursor indicating a point position on the screen. When the arc point is designated in step S3, thereafter, the position of the point cursor is moved between the immediately preceding designated point and the point cursor on the screen of the display 3.
A linear cursor that expands and contracts is displayed, and linear elements that form a dimension line are displayed between the already-designated pointing points (step S4).

With the linear cursor displayed, press C
The refraction point instructing unit 14 of the AD processing unit 1 instructs the operator of the first refraction point of the final dimension line (step S5), and further, while the linear element and the linear cursor are displayed, the final dimension line is displayed. The operator gives an instruction for the second refraction point of (step S6). Next, with the straight line element and the straight line cursor displayed, the center point instructing section 15 of the CAD processing section 1 instructs the center point on the dimension line, that is, the pseudo center point, by the operator (step). S7). When the center point is properly designated in step S7, the writing control unit 17 draws the arc point obtained in step S3 on the drawing data displayed on the display 3 and stored in the memory 16, According to the first refraction point obtained in S5, the second refraction point obtained in step S6, and the center point position obtained in step S7, two-point broken dimension line data is written (step S8).

At least, from the start of the creation of the final dimension in step S2 to the designation of the center point in step S7, for example, the selection of a stop command, the interruption command of an upper command menu such as the main menu, etc. If there is an interruption key that forcibly cancels the execution or command being executed, if the drawing of the final size is interrupted by a predetermined interruption operation such as the operation of the interruption key, the interruption shown in FIG. The routine is executed by interrupt processing. When the interrupt routine starts,
First, the interruption processing unit 18 of the CAD processing unit 1 performs a predetermined interruption process for the routine for creating the final size during execution (step S11).

Next, the error processing section 19 of the CAD processing section 1
If the process being executed is incomplete, a predetermined error process is performed (step S12), and it is determined whether or not the instruction of the refraction point in the creation of the final dimension is completed (step 13). ), If the designation of at least one inflection point has been properly completed, the writing control unit 17 causes the display 3 to follow the linear element that has already been displayed based on the designation point information that has been designated up to that point. The drawing of the final dimension line is performed on the drawing data displayed and stored in the memory 16 (step S14).

In step S14, the second value is obtained in step S6.
If the indication of the inflection point is properly performed, the arc point obtained in step S3 and the first inflection point obtained in step S5 are displayed on the drawing data displayed on the display 3 and stored in the memory 16. And, according to the position of the second refraction point obtained in step S6, the data of the dimensional line of the boundary is written. By utilizing this, by instructing the center point on the dimension line entry, that is, the pseudo center point as the second inflection point in step S6, the interruption process is performed without instructing the center point in step S7. , It is possible to easily create a single dimension broken line.

After the processing of step S14 is completed, and when it is determined in step S13 that the refraction point is not designated at the time of creating the final dimension,
Immediately, the interruption routine by interruption is ended, and the process proceeds to the next process according to the previous interruption operation. The dimension value is written at a predetermined position on the boundary dimension line, for example, in the vicinity of the inflection point on the radius line or the diameter line, and if the radius boundary dimension line mode is selected in advance, the dimension value “R” indicating that there is a certain value is added, and when the diameter dimension line mode is selected in advance, “φ” indicating that it is a diameter is added before the dimension value.

Here, an example of a specific operation in this system will be described in detail. First, C as shown in FIG.
In the menu on the editing screen of the AD system, "Annotation"-
If you select "Execution" (annotation means to enter annotations other than drawing such as dimension lines), a menu as shown in Fig. 5 is displayed. In this menu, select "Dimension"-"Element" 6) is displayed, a menu as shown in Fig. 6 is displayed, and the prompt line on the bottom of the display 3, for example, "Please specify the type of dimension line" is displayed. It In the menu of FIG. 6, four types of toggles, ie, “align”, “inline”, “scale change”, and “kaminari” are shown as toggle switches, that is, toggle switches (hereinafter, simply referred to as “toggle”). "■" indicating that the toggle is on before each toggle item
Or, “□” is attached to indicate that the toggle is off.

For example, when creating a radius dimension line, the "Kaminari" toggle is turned on in the menu of FIG. 6 ("■" indicating that the toggle was turned on before "Kaminari" on the menu is displayed. As the "radius"-
If you select "Execute" (meaning that you want to create the radius dimension line), the menu shown in Fig. 7 will be displayed.
Enters the radius dimension line creation mode. These selections are made by the operator operating the cursor movement keys or the mouse of the input device 2 while looking at the edit screen of the display 3.

In the menu shown in FIG. 7, "automatic recognition"-
When "Execute" is selected, "Please specify a point on the circumference" is displayed on the prompt line, so that the operator should draw a dimension line. That is, since it is required to specify the arc point, the mouse is operated to specify the arc point. next,
As shown in FIG. 8, the prompt line "Please indicate the first inflection point" is displayed.
The operator is required to indicate the first inflection point of the final dimension line. At this time, as shown in FIG. 8, a linear cursor that moves and expands / contracts following the position of the point cursor is displayed between the already-indicated arc point and the cross-shaped point cursor.
It is desirable that the end portion of the straight line cursor on the arc point side be formed in an arrow shape as shown in the drawing in accordance with the shape of the dimension line to be created. When the first refraction point is designated by operating the mouse or the like, next, as shown in FIG. 9, the prompt line "please specify the second refraction point" is displayed, so that the operator can determine the final dimension. An indication of the second inflection point of the line is required. At this time, as shown in FIG. 9, a linear element forming a dimension line is displayed between the already-indicated arc point and the first inflection point, and the already-indicated first element is displayed.
Between the inflection point and the cross-shaped point cursor, a linear cursor that moves and expands / contracts following the position of the point cursor is displayed.
In the case of creating a one-point broken final dimension, at this time, the mouse or the like is operated to designate the center point on the dimension line entry, that is, the point to be the pseudo center point, as the second inflection point. When the second refraction point is designated, next, as shown in FIG. 10, a message "please specify the center point" is displayed on the prompt line, thereby requesting the operator to designate the pseudo center point. At this time, as shown in FIG. 10, a dimension line is formed between the already-indicated arc point and the first inflection point and between the first inflection point and the second inflection point (as a pseudo center point). A linear element is displayed, and a linear cursor that moves and expands / contracts in accordance with the position of the point cursor is displayed between the second inflection point that has already been designated as the pseudo center point and the cross-shaped point cursor. When creating a one-point broken dimension, in this state, for example, "Cancel" as shown in the figure.
When the interruption operation of the drawing of the final size is performed by selecting a command, predetermined interruption and error processing are performed, and as shown in FIG. 11, the arc point, the first inflection point and the pseudo center point A broken point dimension line connecting the second refraction points of is written with a radius dimension value of "R80". On the other hand, in the case of creating a two-dimensional broken dimension, when the mouse or the like is operated in the state of FIG. 9 in which the designation of the first refraction point is completed and the second refraction point is designated as shown in FIG. As shown in, the prompt line "Please specify the center point" is displayed, and the operator is required to specify the center point on the dimension line, that is, the pseudo center point. Here, when the pseudo center point is designated by operating the mouse or the like, as shown in FIG.
The two-point broken dimension line connecting the arc point, the first and second inflection points and the pseudo center point is written together with the radius dimension value of "R80".

As described above, it is possible to very easily create the boundary dimension line at an arbitrary position. Also, it is possible to automatically create a single-point broken dimension line, and it is possible to easily select whether to use a single-point broken dimension line or a two-point broken dimension line by interrupting operation. Operability is good. In addition, during the creation of the final dimension, the linear element forming the dimension line based on the point already pointed and the linear cursor based on the point cursor position display the shape of the final dimension line in real time. Therefore, it is possible to predict and confirm the shape of the final dimension line while creating the final dimension.
It is possible to accurately grasp the shape of the created dimension line. It should be noted that it is not the large arc radius radius dimension line of the radius,
For the large arc diameter diameter dimension line of the diameter, by selecting the diameter diameter line creation mode in advance in the state of FIG.
It can be created in exactly the same manner as described above, and in that case, as shown in FIG. 15, the dimension value “φ160” with “φ” indicating the diameter is written.

[0030]

As described above, according to the present invention, C
When entering the large arc diameter dimension on the drawing data in the AD system, when selecting the entry of the large arc diameter dimension,
Instruct the arc point that is the dimension entry point on the arc to be measured on the drawing to which the dimension line is to be entered, and let the inflection point of the dimension line start from the arc point, and the dimension for the arc point and the inflection point The central point on the line entry is designated, and the large arc diameter dimension line data is written on the displayed and stored drawing data based on the positions of the circular arc point, the inflection point, and the central point, and it has already been designated. While displaying the linear element between the designated points, by displaying the linear cursor between the immediately preceding designated point and the point cursor position, it is easy to grasp the dimension line shape in the process of creating the large arc diameter dimension line, Moreover, 1
It is possible to provide a large arc diameter dimension creating method and apparatus that can easily perform arbitrary use of a large arc diameter dimension of a point break and a large arc diameter dimension of a two-point break.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a CAD system incorporating a large arc diameter dimension creating device according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a schematic operation of creating a large arc diameter dimension in the CAD system of FIG.

FIG. 3 is a flowchart for explaining a schematic operation at the time of an interrupting operation during creation of a large arc diameter dimension in the CAD system of FIG.

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

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

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

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

8 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system in FIG.

9 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system in FIG.

10 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system in FIG.

11 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system in FIG.

12 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system in FIG.

13 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system in FIG.

FIG. 14 is a diagram schematically showing a state of a display screen for explaining a schematic operation of the CAD system of FIG.

15 is a diagram schematically showing an example of a large arc diameter dimension line for explaining a schematic operation of the CAD system in FIG.

[Explanation of symbols]

1 ... CAD processing unit, 2 ... Input device, 3 ... Display,
4 ... Output device, 5 ... Storage device, 11 ... Display control unit, 12
... command input section, 13 ... arc point designating section, 14 ... refraction point designating section, 15 ... center point designating section, 16 ... memory, 17 ... writing control section, 18 ... interruption processing section, 19 ... error processing section.

Claims (4)

[Claims] 1. When a large arc diameter dimension is entered on drawing data in a CAD system, a selection step for selecting the entry of the large arc diameter dimension, and on the arc to be measured on the drawing in which the dimension line is to be entered An arc point designating step of designating an arc point which is a dimension entry point, a refraction point designating step of designating a refraction point of the dimension line starting from the arc point designated by the arc point designating step, and the arc point designating step And a center point designating step for designating a center point on the dimension line for the arc point and the bending point designated by the bending point designating step, and the arc point designating step, the bending point Large arc diameter dimension line data based on the arc point, inflection point, and center point position specified by the instruction step and center point instruction step And a writing step, and in the arc point designating step, the inflection point designating step, and the center point designating step, in addition to the point cursor indicating the cursor pointing position, a linear element is displayed between the already designated pointing points. In addition, a method of creating a large arc diameter dimension is characterized by including a step of displaying a straight line cursor between the immediately preceding designated point and the point cursor position. 2. An interruption processing step for interrupting the dimension line creation at a desired point during the dimension line creation by interrupt processing, and a display between the already designated pointing points when the dimension line creation is interrupted by this interruption processing step. The large arc diameter dimension creating method according to claim 1, further comprising an error processing step of immediately shifting to a writing step so as to create a dimension line by the linear element. 3. A large arc diameter dimension creating apparatus for entering a large arc diameter dimension on a drawing in a CAD system, and command input means for inputting a command including a large arc diameter dimension entry command, and at least the large arc diameter. An arc point designating means for functioning when a diameter dimension entry command is entered, and for designating a circle point which is a dimension entry point on an arc to be measured on a drawing in which a dimension line is to be entered, and the arc A refraction point instruction means for instructing a refraction point of a dimension line from a point as a starting point, and a center point instruction means for instructing a center point on the dimension line entry with respect to the arc point and the refraction point, displayed and stored. Writing means for writing the data of the large arc diameter dimension line on the basis of the indicated positions of the circular arc point, the inflection point and the center point on the drawing data, and In relation to the arc point designating means, the inflection point designating means, and the center point designating means, a means for displaying a point cursor indicating a cursor designating position, a means for displaying a straight line element between the designated pointing points, and immediately before. And a means for displaying a linear cursor between the designated point and the position of the point cursor. 4. An interruption processing means for interrupting the dimension line creation at a desired point during the dimension line creation by interruption processing, and between the already designated pointing points when the dimension line creation is interrupted by the interruption processing means. 4. The large arc diameter dimension creating device according to claim 3, further comprising: error processing means for immediately operating the writing means so as to create the dimension line by the displayed linear element.