JPH02245973A - Cad data display system - Google Patents

Abstract

PURPOSE:To attain the partial display/nondisplay of graphic data by calculating the intersection between an undisplayed range and a graphic element included in the range, obtaining the linear length of each graphic element to be displayed or not to be displayed, preparing display data, and displaying them. CONSTITUTION:When the data to express the undisplayed range are inputted to an element nondisplay control part 11, the data are stored into an undisplayed range storing means 12, and with the use of the data in the undisplayed range and the graphic element data in a memory 15, the intersection between the undisplayed range and each graphic element is calculated. A data preparing part 14 prepares the data expressing the linear length to be displayed and the linear length not to be displayed in each graphic element based on an intersection position and the graphic element data related to the intersection. The prepared data to express the display and nondisplay are stored in a form at to be added to the original graphic element data in a memory 15, and the undisplayed range is expressed as a blank on a display part 16. Thus the partial display/nondisplay of the graphic element is attained.

Description

[Detailed Description of the Invention] [Summary] Regarding a CAD data display method in which a plurality of graphic elements are displayed and the data is used for mechanical design, a CAD data display method capable of partially displaying/hiding graphic data is provided. For the purpose of this, the processing device is equipped with an element hiding control section activated by a hiding function input and a memory. and a data creation unit that creates display data that hides a portion of each graphic element within the hidden range based on the calculated intersection data. The configuration is such that the display is performed using the created display data.

[Industrial Application Field] The present invention relates to a CAD data display method in which a plurality of graphical elements are displayed and the data is used for mechanical design.
D (Computer Aided Design:
computer-aided design) systems have become widely used. In that case, the graphics are created using CAD and output or displayed on a display device or plotter device.

For example, in the case of machine design, it is desirable that the drawing data displayed on a display device (display device or profiler device) can be converted and used by the numerically controlled machine tool that manufactures the corresponding machine. This streamlines design and manufacturing operations.

However, at the drawing stage in CAD, when you want to write notes or other text over the drawn figure, or when the figures overlap and are difficult to see, it is necessary to hide part of the figure to make it easier to see. It is desired to realize this in a simple manner without affecting the data used for machine manufacturing.

[Conventional technology] FIG. 7 is an explanatory diagram of a conventional example.

In the case of handwriting, when a square P, a triangle Q, and a circle R are written on paper, as shown in Figure 7(b) A,
If you want to write ABCJ as a note at position M spanning side P1 of quadrilateral P and side Q1 of triangle Q,
You can write directly over the existing line, but to make it easier to see, first use an eraser to erase part of the line around the writing position M (parts of Pl, Ql), and then write in the blank position. Write the note sentence rABCJ across it.

Conventional CAD systems did not have a concept of this type of handwriting, so they used a combination of conventional techniques to trim and move the graphic elements so that they would not occur within the corresponding range. .

That is, as shown in FIG. 7(b), the data of the triangular graphic element Q1 and the data of the rectangular graphic element P1 can be displayed or hidden as a - unit, but the operation processing Because the unit is a graphic element, it was not possible to hide part of the graphic element.

The conventional trimming (dividing) method is shown in Figure 7(b).
The area indicated by the dotted circle N in the display figure of (a) and (b) is taken out and shown as the mouth.

If ko (7), ! PI, Ql, Tsuretsure, line P1',
It is divided into two lines: PI'' and lines Q1° and Ql''. The data representing each line is a space (blank area) created by the 0-divided data, where data for each line segment is created as a new graphic element by performing input operations such as specifying the coordinates of the point to be divided and displayed. You can write notes and other characters in the field.

Furthermore, in the conventional "movement" method, the entire graphic element is moved by manipulating the layout of the graphic, and writing is performed in the space created by the movement.

[Problem B to be solved by the invention] As described above, in the conventional CAD system method, when a graphic element is divided, the original graphic element is changed into multiple divided graphic elements, and the graphic If you move , the arrangement will be different. In this case, the figure data that has been subjected to division and movement processing will be different from the original figure data, so the shape data, which is a feature of CAD, can be used as numerical control data (processing data) for machining. If you try to change and use it as analysis data, the actual shape and figure (
Display) There was a problem that the data did not match. In that case, it becomes necessary to create numerical control data and analysis data separately from display data.

The present invention is a CA that can partially display/hide graphic data.
The purpose is to provide a data display method.

[Means to solve the problem] FIG. 1 is a diagram showing the basic configuration of the present invention.

In FIG. 1, 10 is a processing device, 11 is an element hiding control section, 12 is a storage means for a hidden range, 13 is an intersection calculation means, 14 is a data creation section, 15 is a memory, and 16 is a display section.

When a hidden range is input, the present invention calculates the intersection points with graphical elements included in the range, calculates the length of the line to be displayed and the line to be hidden for each graphical element, and displays the data. is created and displayed.

[Operation] When it is desired to partially hide a graphical element, when a graphical element non-display control command is input to the processing device 110, the element non-display control unit 11 is activated.

Subsequently, when data representing the non-display range is input, the data is stored in the non-display range storage means 12.

Using the data of the hidden range stored in the storage means 12 and the graphic element data (original graphic element data) in the memory 15, the intersection between the hidden range and each graphic element is calculated.

The calculated intersection position is supplied to the data creation unit 14, and the data creation unit 14 calculates the length of the displayed line in each graphic element based on the intersection position and the graphic element data related to the intersection. Create data that represents the length of the line that will be hidden.

The created display/non-display data is stored in the memory 15 in a format that is added to the original graphic element data. When the data regarding the graphical elements related to the memory 15 is created, it is displayed on the display section 16, and the non-display range is displayed as blank, so that characters etc. can be written in the blank area.

The data for each graphic element is in a format in which data representing partial display/non-display is added to the original graphic element data newly created, so it can be used as is as data for machine manufacturing, etc.

[Example] Fig. 2 is a processing flow diagram for data creation in the embodiment, Fig. 3 is a processing flow diagram for data display in the embodiment, Fig. 4 is a hardware configuration diagram, and Fig. 5 is a data configuration of graphical elements. A diagram showing
FIG. 6 is a diagram showing a specific example of operation.

In the hardware configuration diagram of FIG. 4, 40 is a CPU;
41 is a database for CAD design stored on a magnetic disk, 42 is a main memory, 43 is a display control unit, 44 is a display memory, 45 is a graph ink display, 46 is a light pen, 47 is a keyboard, and 48 is a Represents a tablet.

Using such a hardware configuration, CAD design is performed and CAD data display processing according to the present invention is performed.

To explain the processing flow of data creation in the embodiment with reference to FIG. 2, first, the keyboard 47 or tablet 48
When you enter a command for the graphic element hiding function from , the system displays a message asking you which range you want to hide (step 20). The coordinates of the vertices of a polygon (for example, a rectangle containing a character string to be filled in) that indicates the range to be hidden on the figure are entered manually (step 21), and then the coordinates of the vertices of the polygon that indicates the range to be hidden on the figure are entered (step 21). Find the graphic elements by calculation using conventional graphic processing techniques (step 22)0
Next, the part (non-display part) included inside the polygon among the intersecting figures is found (step 23). Once the data of the non-display part is found, the data inside the CAD is updated with that data ( Step 24).

In the above description, the hidden range was specified by inputting the vertices of a polygon, but there are other methods as well. That is, specify the graphical element to be hidden using the light pen (Fig. 4, 46), tablet left (Fig. 4, 48), or the cursor on the screen, and then specify the length to be hidden using the keyboard (Fig. 4, 48). 47), the data of the non-displayed portion can also be obtained.

FIG. 5 shows the data structure updated with the data in the non-display area.

In FIG. 5, ``a'' represents an example of line data, and ``mouth'' represents an example of circle data.

In the case of line data, the starting point coordinates of the straight line graphic element are X+,
It is indicated by Y+, and the end point coordinates are indicated by Xs and Yz.

The following <T, W, and C represent line attributes, and specify the line type (solid line, dashed line, one-dot line, etc.), stripe thickness, and line color, respectively.
The next S indicates the display/non-display of this entire line, and is data that controls the display/non-display of each graphic element, which is performed in the conventional display method.

Of the data structure of A, up to x,, y, ...S is the same as the conventional graphic element data structure, but following this (
Data L and the following data are data created according to the present invention.

L,,S are partial display/non-display information, Ll represents the length of this graphic element from the starting point (X+, Y+), and S governing this displays a line of that length. or hide (11" for display, 60" for non-display)
), and Ll.

Length by S, show/hide, continue <1.18
is information representing display/non-display of the line between (length L2 from the starting point - length Ll from the starting point).

Thereafter, partial lines are displayed/hidden in sequence.

The data structure of the circle is shown at the beginning of Figure 5, and in this case,
The only difference is that radius data R is included, but the other configurations are the same as the line data.

Also, of the data structure shown in Figure 5 A and A, the data used for numerical control of the machine is the part other than data for display control, and partial display/non-display of graphical elements. Data related to this is not used and can be used as is.

Next, the flow of data display processing performed after partially hidden data of a graphic element is created will be explained with reference to FIG.

First, the updated graphic data is imported into the CPU 40 (
Step 30), then the information on the display area (coordinates, line type, thickness, two colors, , S, L2゜S...) is sent to the display control unit (
The 0 display control unit (step 31) sends the data to (Fig. 4 43),
The passed data is displayed in a conventional manner according to the instructed display/hide (step 32). However, the data S representing the display/hide of the entire graphical element instructs "display" in this example, but it also instructs the subsequent partial display/hide. Display (S)/non-display (NS) of each part is controlled.

A specific example of the operation shown in FIG. 6 will be explained.

A, the straight line L+, Lt and circle C are displayed on the display screen as shown in
If you want to hide the rectangular range of vertices A, BC, and D when I is displayed, enter the coordinates of each vertex, Hr-+ and circle C2 will be included in that range, and the intersection points P1 to Four items of P4 are required. As a result, according to the processing flow shown in FIG. 2, line and circle data including partial display/non-display are updated as shown in c.

Based on the updated data, a display including a blank area is performed as shown at the beginning of FIG. 6.

[Effects of the Invention] According to the present invention, it is possible to partially display/hide graphical elements in CAD design by a simple operation, and even when data is updated for display/hide, the machine can It can also be used as data for controlling processing, etc.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the basic configuration of the present invention, Fig. 2 is a processing flow diagram for data creation in the embodiment, Fig. 3 is a processing flow diagram for data display in the embodiment, Fig. 4 is a hardware configuration diagram, FIG. 5 is a diagram showing the data structure of graphic elements, FIG. 6 is a diagram showing a specific example of operation, and FIG. 7 is an explanatory diagram of a conventional example. In FIG. 1, IO: Processing device 11 - Element display control section 12: Hidden range storage means 13: Intersection calculation means 14: Data creation section 15: Memory 16: Display section Patent applicant Fujitsu Limited Sub-Attorney Kazuo Shihosaka Example of data creation process〇-Figure 2

Claims (1)

[Claims] In a CAD data display method in which a plurality of graphical elements are displayed and the data is used for mechanical design, an element non-display control unit (11) activated by a non-display function input to a processing device (10).
) and a memory (15), and an element hiding control section (11).
is a storage means (12) for storing the input hidden range.
and an intersection calculation means (13) for calculating the intersection between each graphical element in the memory (15) and the hidden range, and based on the calculated intersection data, hides the portion of each graphical element within the hidden range. A CAD data display method characterized by comprising a data creation section (14) that creates display data, and displays using the created display data.