JPH06208598A - Method and device for preparing dimensional line - Google Patents

Abstract

PURPOSE:To reduce the load of operator's operation by easily and properly entering a dimensional line by simple operation based upon a serial format while automatically changing an intermediate symbol. CONSTITUTION:A dimension preparing part 15 prepares dimension line data based upon a measuring point and dimensional position information obtained by a measuring point indicating part 13 and a dimensional position indicating part 14. An interval judging part 16 judges whether an extension line interval drawn out from the measuring point is narrower than a prescribed value or not based upon the dimension line data obtained by the preparing part 15. When at least one of extension line intervals formed on both the sides of an extension line positioned on an intermediate part is judged as an interval narrower than the prescribed value, an intermediate code processing part 17 changes a terminal symbol corresponding to the extension line of the intermediate part to a prescribed intermediate symbol. A write/rewrite controlling part, 19 writes the dimensional line data obtained by the preparing part 15 and the processing part 17 on displayed and stored drawing data.

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 dimension line creating method and apparatus for appropriately writing dimension lines in a drawing data created by a CAD system in a serial entry format.

[0002]

2. Description of the Related Art When using a CAD system, C
Ordinary vertical dimension in drawing data created by AD system (draws auxiliary dimension line perpendicular to dimension line)
It is not uncommon to want to make continuous writing, such as diagonal dimension (drawing the dimension auxiliary line diagonally with respect to the dimension line) in series, that is, in the serial entry format. In a conventional CAD system, when automatically creating standard dimension lines that allow serial entry of normal vertical dimensions and diagonal dimensions in the serial entry format, the serial entry is instructed in advance and the first dimension 1. Indicate the position of the second measurement point and the dimension line, and after writing the first dimension line, indicate the next measurement point (for example, the third measurement point following the second measurement point), The dimension line is entered in the serial entry form by writing the next dimension line in series on the first dimension line and sequentially repeating the instruction of the next measurement point as necessary.

[0003]

As described above, in the conventional CAD system, although the dimension lines can be automatically created in a serial form, basically, a single dimension such as a vertical dimension and an oblique dimension is used. Since the line was processed repeatedly, even when there were a large number of measurement points in a narrow area, the terminal symbols on each dimension line were all the same arrow symbol, which could be unsightly. On the other hand, in order to avoid making it unsightly, in order to make the terminal symbol in the middle of the dimension line of serial entry into the intermediate symbol of the simplified form, the operator draws the dimension line individually or the terminal in the middle portion. The symbols had to be changed individually, and it was not possible to effectively use the automatic creation function of serially entered dimension lines. Therefore, in such a case, the operator has to perform an extremely complicated operation.

The present invention has been made in view of the above circumstances, and it is possible to easily and appropriately perform automatic change of intermediate symbols and enter dimension lines in a serial form by a simple operation. It is an object of the present invention to provide a dimension line creating method and apparatus which can remarkably reduce the operation load of an operator.

[0005]

The dimension line creating method according to the present invention requires a selecting step for selecting a series of dimension lines and a first dimension line entry when drawing dimensions on drawing data. A basic point designating step for designating a basic point including a measurement point on a drawing, a dimension position designating step for designating a position of a dimension line on which a dimension is to be entered, and a drawing data stored and displayed, A basic writing step for writing dimension data based on the instruction by the measurement point instruction step and the dimension position instruction step,
An additional point instruction step for sequentially instructing other measurement points on the drawing necessary for drawing the dimension line, and a new intermediate point generated based on the instruction by the additional point instruction step on the displayed and stored drawing data. An interval detection step of detecting that at least one of the dimension extension line intervals on both sides of the dimension extension line is narrower than a predetermined value, and based on the instruction by the additional measurement point instruction step on the displayed and stored drawing data. At the same time as adding dimension data to the dimension line written in the basic writing step in a serial format and writing the dimension data, at least one of the dimension extension line intervals on both sides of the new intermediate dimension extension line has a predetermined value. Only when it is detected that the width is narrower than that, the terminal symbol corresponding to the new intermediate extension line of the dimension line to be entered in series is added to a predetermined intermediate mark. It is characterized by having an additional writing step for rewriting the.

A dimension line creating apparatus according to the present invention is a dimension line creating apparatus for entering dimensions on drawing data, and a command input means for inputting a command including a series entry command of dimension lines, and a first dimension line. Point indicating means for sequentially indicating the basic points including the measurement points on the drawing necessary for filling in and the additional measurement points on the drawing necessary for writing additional dimension lines Dimensional position indicating means for indicating the position of the dimension line, and both sides of the new intermediate dimension auxiliary line generated based on the indication of the additional measurement point by the point indicating means on the displayed and stored drawing data. Of the dimensional auxiliary line is narrower than a predetermined value, and the point indicating means and the dimensional position indicating means are provided on the displayed and stored drawing data. When the dimension data is written in the serial format based on the instruction, and at least one of the dimension extension line intervals on both sides of the new intermediate dimension extension line is detected to be narrower than the predetermined value in the interval detection step, Only, a writing means for rewriting the terminal symbol corresponding to the new intermediate dimension extension line of the dimension line to be serially written into a predetermined intermediate symbol is provided.

[0007]

In the dimension line creating method and apparatus of the present invention, when a dimension is entered on drawing data, serial entry of dimension lines is selected, and measurement points on the drawing necessary for entry of the first dimension line are included. Instructing the basic point, instructing the position of the dimension line on the drawing where the dimension should be entered, writing the dimension data based on the above instruction on the displayed and stored drawing data, and further writing the dimension line The other measurement points required on the drawing sequentially, and on the drawing data that is displayed and stored, the dimension extension line intervals on both sides of the new intermediate dimension extension line generated based on the other measurement points are displayed. When it is detected that at least one is narrower than a predetermined value, the dimension data is written in the serial format to the already written dimension line on the displayed and stored drawing data, and the new intermediate value is added. Only when it is detected that at least one of the dimension extension line intervals on both sides of the dimension extension line is narrower than a predetermined value, the terminal symbol corresponding to the new intermediate dimension extension line of the dimension lines to be serially entered is determined. Since it is rewritten with the intermediate symbol of, the dimension line can be entered in a serial format while easily and properly automatically changing the intermediate symbol with a simple operation, and the operator's operation burden can be significantly reduced. .

[0008]

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 dimension line creating apparatus according to an embodiment of the present invention. In the CAD system of the present embodiment, when drawing a dimension line in the drawing data in the serial entry format, the first and second measurement points for measuring the dimension, the position of the dimension value on the drawing, and the additional measurement point are designated. Then, on the displayed and stored drawing data, based on the above-mentioned instruction, the data of the dimensional line in the serial format for the plurality of adjacent measurement points is displayed only when the dimensional auxiliary line spacing is narrower than the predetermined value. , It is possible to sequentially write while changing the terminal symbol at the intermediate portion of the serially written dimension line to a predetermined intermediate symbol.

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 dimension line creation processing is executed. 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.
To enter. The display 3 displays necessary information such as processed image information by the CAD processing unit 1 and information related to input by the input device 2. 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. The storage device 5 is composed of, for example, a disk device such as a hard disk device, operates in association with the CAD processing unit 1, and stores data such as image information before processing, after processing, 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 measurement points for executing the dimension line creating process including the automatic change function of the intermediate symbol in the serial entry according to the embodiment of the present invention. Pointing unit 13, dimensional position pointing unit 1
4, a dimension creating unit 15, an interval determining unit 16, an intermediate symbol processing unit 17, a memory 18, and a writing / rewriting control unit 19.

The display controller 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 an operator to input a command including a dimension line writing command by an interactive operation with the screen of the display 3, for example. The command input unit 12 also performs processing for enabling functions such as serial entry of dimension lines and automatic change of intermediate symbols in serial entry through interactive operation with the screen of the display 3. Therefore, the command input unit 12 controls the display control unit 11 as necessary.

The measuring point designating section 13 functions at least when the dimension line writing command is inputted by the command input section 12, and the dimension lines are serially arranged on the drawing by an interactive operation with the screen of the display 3, for example. A process for instructing the operator to instruct the first and second measurement points, that is, the basic measurement points and the additional measurement points when writing is performed. Therefore, the measurement point instruction unit 13 also controls the display control unit 11 as necessary. When the dimension line writing command is an angle dimension writing command, the measurement point designating section 13 causes the operator to designate a center point as a basic measurement point in addition to the first and second measurement points. The processing for is also performed.

The dimension position designating section 14 functions at least when the dimension line writing command is input by the command input section 12, and, for example, enters a dimension line on the drawing by an interactive operation with the screen of the display 3. A process for causing the operator to instruct the position of the dimension line when performing is performed. Therefore, the dimension position designating section 14 also controls the display control section 11 as necessary.

Based on the measurement point and dimension position information obtained by the measurement point designating section 13 and the dimension position designating section 14, the dimension creating section 15 determines, for example, a series of measurement points designated by the measurement point designating section 13. Sequentially create dimension line data in the entry format. Based on the dimension line data obtained by the dimension creating unit 15, the interval determination unit 16 determines whether or not the dimension auxiliary line interval drawn from the measurement point is narrower than a predetermined value set in advance, that is, the dimension line length is the predetermined value. It is determined whether it is shorter than the value. The predetermined value is fixedly set to, for example, 9 mm or 10 mm in consideration of the length of a size character of a general size value. The predetermined value may be appropriately set based on the actual length of the dimension character area at that time.

The intermediate symbol processing unit 17 determines whether or not at least one of the dimension extension line intervals on both sides of the dimension extension line located in the middle of the serially entered dimension line created by the dimension creation unit 15 is the interval determination. When the unit 16 determines that the length is shorter than the predetermined value, the terminal symbol for the dimension extension line in the middle of the dimension line data created by the dimension creating unit 15 is sequentially added, for example, a slash “/” or a dot “・ 」
A process for changing to a predetermined intermediate symbol such as ".

The memory 18 stores information including CAD drawing data to be displayed by the display control unit 11. The stored contents of the memory 18 are transferred to the storage device 5 as needed. The memory 18 may share the memory used in the normal CAD processing in the CAD processing unit 1. The writing / rewriting control unit 19 sequentially writes the dimension line data obtained by the dimension creating unit 15 and the intermediate symbol processing unit 17 on the drawing data displayed on the display 3 and stored in the memory 18.

Next, with reference to the flow chart shown in FIG. 2, a detailed description will be given of the operation of the CAD system having the above-described structure, particularly regarding the dimension line creation including the automatic change function of the intermediate symbol at the time of serial entry. It is assumed that the processing shown in FIG. 2 is started as, for example, interrupt processing by command input during normal drawing or editing operation in the CAD system. First, when the operator gives an instruction to automatically change the intermediate symbol via the command input unit 12 of the CAD processing unit 1 (step S1) and a dimension line creation command by serial entry is selected (step S2), the system Is set to the dimension creation mode for serial entry by automatically changing the intermediate symbol (step S3).

In the dimension creation mode for serial entry by automatically changing the intermediate symbols, the measurement point designating section 1 of the CAD processing section 1
By 3, the operator can instruct the basic point including the first and second basic measurement points on the drawing to be measured and entered (for example, in the case of an angular dimension, the basic point also includes the center point). It is performed (step S4). The instruction of the measurement point by the measurement point instruction unit 13 in step S4 is required to be input by the operator via the screen of the display 3,
The operation is performed by the operator performing an instruction operation or the like using the cursor on the screen in response thereto.

Next, the dimension / position instructing section 14 instructs the operator of the position on the drawing where the dimension line should be entered (step S5). Similarly to the case of measuring points, the dimension position instructing section 14 is required to be input by the operator through the screen of the display 3,
The operation is performed by the operator performing an instruction operation or the like using the cursor on the screen in response thereto. In step S5,
When the position of the dimension line is designated, the writing / rewriting control unit 19
According to the dimension line position designated in step S5 and the basic point designated in step S4, the dimension line data for the basic point is written on the drawing data displayed on the display 3 and stored in the memory 18. (Step S6).

Further, the measurement point designating section 13 measures the dimension line, and the operator designates additional measurement points to be entered in series (step S7). Step S7
Then, when the measurement point is designated, the dimension line based on the measurement point and the dimension position input so far is created by the dimension creating unit 15, and the series dimension line is created based on the created dimension line for serial entry. Intervals between the dimension extension lines on both sides of the dimension extension line located in the middle portion of are analyzed by the spacing determination unit 16 (step S8), and based on this result, whether or not the intermediate symbol should be changed, that is, the size of the series dimension line is determined. It is determined whether or not at least one of the dimension extension line intervals on both sides of the dimension extension line located in the middle portion is narrower than a predetermined value (step S9).

When it is determined in step S9 that at least one of the dimension extension line intervals on both sides of the dimension extension line located in the middle of the series dimension line is narrower than a predetermined value and the intermediate symbol should be changed, For the dimension extension line (on both sides)
The terminal symbol is changed to a predetermined intermediate symbol (step S1)
0). When the intermediate symbol is changed in step S10, the writing / rewriting control unit 19 writes the change result of the dimension line and the intermediate symbol added in series to the dimension line for the basic measurement point (step S10). S11). When it is determined in step S9 that the dimension extension line intervals on both sides of the corresponding dimension extension line are both wider than the predetermined value and the intermediate symbol should not be changed, the process immediately proceeds to step S11, and the writing / rewriting control unit is performed. At 19, the dimension line added in series to the dimension line for the basic measurement point is written.

When the additional dimension line is written in step S11, it is determined whether or not the series writing of the dimension line is completed (step S12). If the series entry of the dimension line is not completed, the process returns to step S7. , Steps S7 to S11 are repeated, and when at least one of the dimension extension line intervals on both sides of the dimension extension line located in the middle portion is narrower than a predetermined value, the terminal symbol in the middle portion of the serially entered dimension line is changed. At the same time, the additional dimension line is written. Step S1
When it is determined in 2 that the dimension line serial writing is finished, the system finishes the dimension line serial writing and shifts to the next processing.

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 "Execute" (annotation means to enter annotations other than drawing such as dimension lines), a menu as shown in Fig. 4 will be displayed. In this menu, select "Dimension"-"Element" 5) is displayed, a menu such as that shown in Fig. 5 is displayed, and "Please specify the type of dimension line" is displayed on the prompt line at the bottom of the display 3, for example. This requires the operator to instruct the type of dimension line to be filled. The selection of these menus and the change thereof can be performed by the operator while looking at the editing screen of the display 3
This is done by operating the cursor movement keys or the mouse to move the cursor bar on the menu.

In the menu shown in FIG. 5, a toggle switch for instructing parallel / series entry of dimension lines is turned off. Is displayed), and if “□” before the display of “Date” is displayed,
If is set to "■" and the "Date" toggle is on, set the "Date" toggle to off.
Make sure that “□” is displayed before “Date”. Further, the “intermediate symbol” toggle, which is a toggle switch for instructing on / off of automatic change of the intermediate symbol, is turned on (“■” is displayed before the display of “intermediate symbol”). If it is "■" before the display of "intermediate symbol" and the "intermediate symbol" toggle is on, the "intermediate symbol" toggle is left on. These toggle switches are alternately turned on / off by an operator operating a mouse or the like and operating a click button of the mouse in a state where a desired toggle switch is instructed with a cursor.

In this case, the auxiliary line interval for automatically changing the intermediate symbol is set to 10 mm, for example. That is, according to this setting, when at least one of the distances between the dimension extension lines on both sides of the arbitrary dimension extension line is 10 mm or less, the terminal symbol of the dimension line for the dimension extension line is set to the predetermined intermediate value. The value will be changed automatically. In addition, in the menu of Fig. 5, with the "Date" toggle off and the "Intermediate sign" toggle on,
"Standard" because horizontal dimension is entered by vertical dimension line
-If you select "Horizontal" (in this case, the vertical dimension line is set as the standard dimension), you will enter the dimension line creation mode.
A menu as shown in FIG. 6 is displayed. Normally, in this menu, when it is displayed, "automatic recognition"-
"Execution" is selected preferentially.

In this state, as shown in FIG. 6, the prompt line "Please indicate the first point" is displayed to request the operator to instruct the first measurement point of the dimension line. To be done. When the first measurement point is specified by operating the mouse etc., the prompt line on the screen will display "Please specify the second point" as shown in Fig. 7. An indication of the second measuring point on the dimension line is required. These first and second measurement points are the basic points for serial entry. Second by operating the mouse etc.
When the measurement point is designated, the prompt line on the screen will display "Please specify the position of the dimension line", as shown in Fig.8. An indication of the position above is required. At this time, auxiliary lines substantially corresponding to the position shapes of the dimension lines and the dimension auxiliary lines as shown in FIG. 8 are displayed on the screen.

When the position of the dimension line is designated by operating the mouse or the like, next, as shown in FIG. 9, the basic dimension line is written on the drawing and the prompt line "instructs the next point to be measured." The message "Please." Is required to prompt the operator for additional measurement points.
Also at this time, auxiliary lines corresponding to the position shapes of the dimension lines and the dimension extension lines as shown in FIG. 9 are displayed on the screen. When an additional measurement point is designated by operating the mouse or the like, next, as shown in FIG. 10, an additional dimension line is written on the drawing, and the length of the dimension line newly written, that is, the auxiliary line interval is Since it is 10 mm or less, for example, 9 mm,
The terminal symbol of the dimension line for the new intermediate extension line has been changed to the prescribed intermediate symbol, for example, a slash ("/"), and the prompt line "Please indicate the next point to measure" is displayed. What is done requires the operator to instruct additional measurement points.

When a mouse or the like is further operated to indicate an additional measurement point, an additional dimension line is written on the drawing as shown in FIG. 11, and a new measurement line is added as described above. Since the dimension line length (extension line interval) immediately before the intermediate dimension extension line is 10 mm or less, the intermediate symbol is further changed to a slash (“/”) and the prompt line “Measurement next point” The operator is required to instruct additional measurement points. When the dimension line lengths (auxiliary line intervals) on both sides of the new intermediate dimension extension line generated by the addition of the measurement points both exceed 10 mm, the intermediate symbol is not changed. To end the series entry of dimension lines, in this state, select "automatic recognition"-"stop".

By repeating the instruction of additional measurement points in this manner, dimension lines in a serial form for a large number of consecutive measurement values are sequentially input, and at the same time, the dimension line length is short (dimension auxiliary line spacing is narrow. ), The terminal symbol in the middle part is sequentially changed to a predetermined intermediate symbol. That is, when the dimension line length is sufficiently long (the dimension assist line interval is sufficiently wide), the automatic change of the intermediate symbol is not performed, and the standard terminal symbol is used. In addition, when the type of the intermediate symbol is set to, for example, the dot ".", The dimension line as shown in FIG. 12 is written.

In FIG. 13, when the set value of the auxiliary line interval for automatically changing the intermediate symbol is 10 mm, the dimensions of each measuring point are 30 mm, 8 mm, 9 mm and 20 m, respectively.
An example of dimension lines filled in by this embodiment when m and 28 mm are shown. In this case, only the terminal symbols corresponding to the dimension extension lines on both sides of the dimension values of 8 mm and 9 mm are changed to predetermined intermediate symbols ("/"), and the other terminal symbols are formed as normal arrows. Further, the type of the dimension line which can implement the present invention is not limited to the vertical dimension line, but may be, for example, the diagonal dimension line, and other angle dimensions and the like as long as serial entry using simplified intermediate symbols is possible. It may be the dimension line.

[0031]

As described above, according to the present invention, when a dimension is entered on the drawing data, the series entry of dimension lines is selected, and the measurement points on the drawing necessary for the entry of the first dimension line. Instructing the basic point including, and instructing the position of the dimension line on the drawing to be dimensioned, writing the dimension data based on the above instruction on the displayed and stored drawing data, and further Other measurement points on the drawing that are necessary to fill in the above are sequentially indicated, and the dimension extension lines on both sides of the new intermediate dimension extension line generated based on the other measurement points on the displayed and stored drawing data. When it is detected that at least one of the intervals is narrower than a predetermined value, the dimension data is written in the serial format to the already written dimension line on the displayed and stored drawing data, and the new data is added. Middle dimension Only when it is detected that at least one of the distances between the dimension extension lines on both sides of the extension line is narrower than a predetermined value, the terminal symbol corresponding to the new intermediate dimension extension line of the dimension lines to be entered in series is determined. By rewriting to the intermediate symbol, it is possible to easily and properly change the intermediate symbol automatically and easily, and to fill in the dimension line in a serial format, which can significantly reduce the operator's operational burden. A line creating method and apparatus can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a CAD system incorporating a dimension line creating apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a schematic operation of the CAD system of FIG.

FIG. 3 is a diagram schematically showing a state of a display screen for explaining a schematic operation of 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.

FIG. 12 is a diagram schematically showing a drawing result for explaining a schematic operation of the CAD system in FIG. 1.

FIG. 13 is a diagram schematically showing a drawing result for explaining a schematic operation of the CAD system in FIG. 1.

[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 ... Measuring point designating section, 14 ... Dimension position designating section, 15 ... Dimension creating section, 16 ... Interval determining section, 17
... intermediate symbol processing unit, 18 ... memory, 19 ... writing / rewriting control unit.

Claims (2)

[Claims] 1. When a dimension is entered on drawing data, a selection step for selecting serial entry of dimension lines and a basic point for instructing a basic point including a measurement point on the drawing necessary for the first dimension line entry. Instructing step, dimensional position instructing step for instructing the position of the dimension line on the drawing to which dimensions are to be written, Basic dimension writing step to write dimension data, additional point instruction step to sequentially instruct other measurement points on the drawing required to enter dimension lines, and additional point instruction on the displayed and stored drawing data While detecting that at least one of the dimension extension line intervals on both sides of the new intermediate dimension extension line generated based on the instruction by the step is narrower than a predetermined value The distance detection step, and on the displayed and stored drawing data, based on the instruction by the additional measurement point instruction step, in addition to the dimension data written in the basic writing step in the serial form, write the dimension data. , The new intermediate of dimension lines to be entered in series is detected only when at least one of the dimension extension line intervals on both sides of the new intermediate dimension extension line is detected to be narrower than a predetermined value in the spacing detection step. And an additional writing step of rewriting the terminal symbol corresponding to the dimension extension line into a predetermined intermediate symbol. 2. In a dimension line creating device for drawing dimensions on drawing data, a command input means for inputting a command including a series writing command for dimension lines, and a drawing line necessary for writing the first dimension line. Point indicating means for sequentially indicating the basic points including the measurement points and the additional measurement points on the drawing necessary for drawing the additional dimension line, and the position of the dimension line on the drawing to be dimensioned And at least one of the dimension extension line intervals on both sides of the new intermediate dimension extension line generated based on the indication of the additional measurement point by the point indication means on the displayed and stored drawing data. Interval detection means for detecting that is smaller than a predetermined value, and in a serial form based on the indications by the point indication means and the dimension position indication means on the displayed and stored drawing data. The data to be entered in series only when it is detected that at least one of the distances between the dimension extension lines on both sides of the new intermediate dimension extension line is narrower than a predetermined value while writing the data of the method. And a writing means for rewriting a terminal symbol corresponding to the new intermediate dimension extension line of the line into a predetermined intermediate symbol.