JPH056401A - Cad graphic display system - Google Patents

Abstract

PURPOSE:To improve the response to an operator by controlling the display data and suppressing conversion from work data to the display data. CONSTITUTION:An input device 1-1 inputs the commands and the data for the formation of the graphics, and an input control means 1-2 analyzes the inputted commands and the data. A command control means 1-3 controls each analyzed command, and a command processing means 1-4 performs the processing at every command based on the commands and the data. A working data control means 1-5 controls the processed working data, and a display control means 1-7 converts the working data into the display data and produces a drawing instruction. Then a display device 1-6 displays a graphic in response to the drawing instruction, and a display data control means 1-8 controls the display data.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a CAD (Compute)
The present invention relates to a graphic display system of r Aided Design), and particularly to a CAD graphic display system using a display device having only basic drawing commands.

[0002]

2. Description of the Related Art In the field of CAD graphic display processing, the created figure is always displayed again at the stage of creating the figure and the step of correcting the created figure, and the latest created figure at that time is displayed. Must be visually communicated to the operator.

FIG. 2 shows a conventional CAD graphic display process using a relatively inexpensive display device that has only basic drawing commands (point and line drawing commands) and has no data management function. As shown, when a command for updating or deleting some elements of the graphic is input from the input device 2-1, the command control unit 2-3 receives the command via the input control unit 2-2, and the command It is passed to the processing means 2-4. The command processing means 2-4 updates or deletes the work data by using the work data management means 2-5, then sends the work data to the display control means 2-7, and the display control means 2-7 makes the work. The latest created figure is always displayed by converting the data into display data and issuing a drawing command to the display device 2-6 to display again.

[0004]

SUMMARY OF THE INVENTION Conventional CAD described above
In the figure display method, the work data of the element to be updated has to be converted into the display data when the drawing figure is redisplayed when the element attributes such as color and emphasis are updated. Since it takes almost the same time as the time of generation, there is a problem that the response to the operator is bad.

In addition, when deleting elements, it is necessary to clear the screen once and redisplay all created figures after deleting the created figures. Therefore, deletion of elements is delayed in proportion to the number of elements. There was a problem that

In view of the above points, an object of the present invention is to provide a CAD graphic display system which manages display data, suppresses conversion of work data into display data, and improves response to an operator. To provide.

[0007]

A CAD graphic display system of the present invention is an input device for inputting commands and data necessary for graphic creation, and an input for analyzing commands and data input from this input device. Control means, command control means for controlling each command analyzed by the input control means, command processing means for performing processing for each command based on the command and data sent from the command control means, Work data management means for managing the work data processed by the command processing means, display control means for converting the work data processed by the command processing means into display data and issuing a drawing command, and this display control means A display device for displaying a graphic according to the issued drawing command, and a display device converted by the display control means. And a display data managing means for managing data.

[0008]

In the CAD graphic display system of the present invention, the input device inputs commands and data necessary for creating a graphic, and the input control means analyzes the command and data input from the input device, and the command control means. Controls each command analyzed by the input control means, the command processing means performs processing for each command based on the command and data sent from the command control means, and the work data management means processes by the command processing means. The display control means converts the work data processed by the command processing means into display data and issues a drawing command, and the display device displays a graphic according to the drawing command issued by the display control means. Then, the display data management means manages the display data converted by the display control means.

[0009]

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a CAD graphic display system according to an embodiment of the present invention. The CAD graphic display system of the present embodiment has an input device 1-1 for inputting commands and data necessary for graphic creation, and an input control means 1-2 for analyzing input commands and input data.
And command control means 1-3 for controlling each command,
Command processing means 1-4 for processing each command
And work data management means 1-5 for managing work data
And a display device 1-6 for displaying a graphic, and a display device 1-6
It is composed of a display control means 1-7 for sending a drawing command to the display and a display data management means 1-8 for managing display data.

The input device 1-1 is an input device such as a mouse and a keyboard that receives commands and data from an operator, and is enabled by a request from the input control means 1-2 to fetch the input command and input data. Save with.

The input control means 1-2 reads the command and data in the format requested by the command control means 1-3 from the commands and data stored in the input device 1-1, and analyzes the commands and data. After performing and editing, the command and data are sent to the command control unit 1-3.

The command control means 1-3 requests the input control means 1-2 for the necessary commands and data at that time, and the returned commands and data together with other control information are processed by the command processing means 1. Send to -4.

The command processing means 1-4 performs processing such as generation, update and deletion for each command based on the data sent from the command control means 1-3. At that time, the command processing means 1-4 refers to, updates, or deletes the work data through the work data management means 1-5 as necessary. Then, the command processing means 1-4 stores the work data of the processing result in the work data management means 1-5 and the display control means 1.
-6 and send.

The work data management means 1-5 manages work data by generating, updating, retrieving and deleting work data in accordance with commands from the command processing means 1-4.

The display control means 1-7 edits the display data as needed in accordance with the command from the command processing means 1-4, and registers, updates, retrieves, deletes, etc. the display data management means 1-8. Send an order. Also, the display control means 1-7
When it is necessary to redraw the graphic, the display data management unit 1-8 searches the display data, and the display device 1
Send a drawing command to -6 to draw a figure.

The display data managing means 1-8 is means for managing display data for each element in a hierarchical data structure as shown in FIG. 3, and is designated in accordance with an instruction from the display control means 1-7. Register, update, search, delete, etc. the display data of the element.

Here, a display data management method in the display data management means 1-8 will be described. As shown in FIG. 3, the display data management unit 1-8 defines, as a data structure for managing display data, an element definition data structure 3-1 having three list structures, a coordinate data structure 3-2, and coordinate value data. It has a structure 3-3 and manages these hierarchically.

First, the element definition data structure 3-1 which is the highest layer has an element serial number which is a key for element retrieval and an element type (point, line, polygon, etc.) as element definition information. The element type for identifying, the element color number that determines the color of the element, the emphasis attribute for visually telling the operator which element to process, and the visibility for controlling the display and non-display of the element. It has attributes, and also has pointer information for list structure and hierarchical structure.

Coordinate data structure 3-2 which is the second layer
Is a list structure for managing coordinate data. here,
The coordinate data is data (for example, a line array) in which the coordinate value data of the number of coordinate values is made into one block.

Coordinate value data structure 3 which is the lowest hierarchy
Reference numeral 3 is a list structure for managing each coordinate value data in the coordinate data.

The display device 1-6 receives a drawing command from the display control means 1-7 and draws a graphic on the display according to the display data.

Next, the C of this embodiment constructed as described above.
The operation of the AD graphic display system will be described.

(1) Element drawing

Here, in order to make the explanation easy to understand,
The operation of drawing a straight line will be described as an example.

When a straight line drawing command is instructed from the input device 1-1, the command control means 1-3 receives the straight line drawing command via the input control means 1-2, and the command control means 1-3. Makes a request to the input control means 1-2 for the data of the first end point of the straight line segment.

Upon receipt of the request, the input control means 1-2 is capable of inputting the data of the first point of the end points of the straight line segment.
To enable.

When the operator inputs the data of the first end point of the straight line segment, the input device 1-1 stores the input data in a dedicated buffer (not shown), and the input control means. Return the control to 1-2.

The input control means 1-2 reads the data of the first end point of the straight line segment stored in the buffer of the input device 1-1 and converts it into the format required by the command control means 1-3. The data of the first end point of the straight line segment is sent to the command control means 1-3.

In the same manner, the data of the end points of the straight line segment is processed when the data of the second end point of the straight line segment is processed and the data of the end points of the straight line segment are obtained. Command processing means 1 together with a drawing command for a straight line segment
Send to -4.

The command processing means 1-4 creates coordinate data of a straight line based on the data of the end points of the straight line that has been sent, adds necessary element attributes to it, and works as work data of the straight line. It is sent to the data management means 1-5 and the display control means 1-7, respectively.

The work data management means 1-5 registers the received work data of the straight line in a dedicated file (not shown).

On the other hand, the display control means 1-7 creates the display data by converting the received work data of the straight line into the format of the interface with the display device 1-6 by calculating the coordinate value data and the like. Send a drawing command to the display device 1-6,
A straight line segment is drawn on the display according to the display data. At the same time, the display control means 1-7 sends a display data registration command to the display data management means 1-8.

The display data managing means 1-8 stores the display data of the straight line in accordance with the received display data registration command.
Register in the data structure shown in FIG.

An example of the data structure created by the above operation is shown by reference numeral 4-1 in FIG. Here, the display data of the white straight line segment is registered.

(2) Element update

Here, the operation when changing the element color of the straight line drawn in the drawing example of the element of (1), the command control means 1-3 is a series of elements of the update target element required by the color change command. The description will be given from the time when the number and the element color number to be changed are received.

Upon receiving the element serial number and the element color number of the element to be updated, the command control means 1-3 sends the element serial number and the element color number to the command processing means 1-4 together with the color change command.

The command processing means 1-4 sends the element serial number and the element color number of the sent color change command to the work data management means 1-5 and the display control means 1-7 as an element attribute change command.

The work data management means 1-5 searches the work data of the element to be updated with the element serial number given by the element attribute change command, and determines the element color number in the searched work data by the element attribute change command. Change to the given element color number.

On the other hand, the display control means 1-7 further sends an element attribute change command accompanied by the element serial number and the element color number to the display data management means 1-8.

The display data management means 1-8 searches the display data of the element to be updated with the element serial number given by the element attribute change command, and gives the element color number of the searched display data by the element attribute change command. The display data after the change is returned to the display control means 1-7.

The display control means 1-7 sends a drawing command to the display device 1-6 according to the changed display data, and causes the display to draw the straight line segment after the color change.

By the above-described operation, the work data is converted into the interface format with the display device 1-6 to create the display data (without recalculating the coordinate value data), and the color of the element is changed. Be changed.

An example of the data structure created by the above operation is shown by reference numeral 4-2 in FIG. Here, reference numeral 4 in FIG.
The display data of the white straight line segment indicated by -1 has been changed to the display data of the red straight line segment.

(3) Deleting elements

Here, regarding the operation when deleting the straight line segment drawn up to the element updating example of (2), the command control unit 1-3 receives the element serial number of the element to be deleted which is required by the deletion command. It will be explained from the point when the

Upon receiving the element serial number of the element to be deleted, the command control means 1-3 sends the element serial number to the command processing means 1-4 together with the delete command.

The command processing means 1-4 uses the element sequence number of the transmitted deletion command as the work data management means 1-
5 and display control means 1-7 as an element deletion command.

The work data management means 1-5 searches the work data of the element to be deleted with the element serial number given by the element deletion command, and deletes the searched work data from the dedicated file.

On the other hand, the display control means 1-7, in order to make the visible attribute of the straight line segment invisible by deleting the element, displays the visible attribute change command for setting the straight line segment as the background color of the drawing window together with the element serial number. Send to the management means 1-8.

The display data management means 1-8 searches the display data of the element to be deleted by the element serial number given by the visible attribute change command, changes the visible attribute of the searched display data to invisible, and changes the display attribute. The subsequent display data is returned to the display control means 1-7.

The display control means 1-7 sends a drawing command to the display device 1-6 according to the changed display data, and causes the display to draw a straight line segment in the background color of the drawing window.

As a result, the straight line segment that has been drawn up to this point is redrawn from above with the background color, so that it appears to the operator that it has been deleted.

An example of the data structure created by the above operation is shown by reference numeral 4-3 in FIG. Here, reference numeral 4 in FIG.
-2, the visible attribute of the display data of the red straight line segment is O
It is set to FF.

Finally, the display control means 1-7 sends a deletion command to the display data management means 1-8 by designating the element serial number.

The display data managing means 1-8 searches the display data of the element to be deleted by the element serial number given by the delete command, and deletes the display data of the searched element to be deleted.

With the above operation, the display data can be deleted by following the work data by the redisplay processing of only the deletion target element.

[0059]

As described above, according to the present invention, in the CAD graphic display system, by managing the display data and effectively utilizing the display data, the graphic is redisplayed when the element attributes such as color and emphasis are updated. Is faster and the response to the operator is improved.

Further, when deleting an element, the drawing of the element can be erased from the display by redisplaying only the element to be deleted, so that the speed of the deletion processing can be kept constant even if the number of elements increases. There is an effect that you can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a CAD graphic display system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional CAD graphic display system.

FIG. 3 is a data structure diagram of display data management means in FIG.

FIG. 4 is a diagram showing an example of a data structure diagram of FIG.

[Explanation of symbols]

 1-1 Input Device 1-2 Input Control Means 1-3 Command Control Means 1-4 Command Processing Means 1-5 Work Data Management Means 1-6 Display Device 1-7 Display Control Means 1-8 Display Data Management Means 3- Definition data structure of 1 element 3-2 Coordinate data structure 3-3 Coordinate value data structure 4-1 Example of data structure when creating element 4-2 Example of data structure when updating element 4-3 Data structure when deleting element Example

Claims (1)

Claim: What is claimed is: 1. An input device for inputting a command and data required for creating a figure, an input control means for analyzing a command and data input from the input device, and an input control means. Command control means for controlling each command analyzed by, command processing means for processing each command based on the command and data sent from this command control means, and work processed by this command processing means Work data management means for managing data, display control means for converting the work data processed by the command processing means into display data and issuing a drawing command, and a graphic according to the drawing command issued by this display control means. Display device for displaying and display data management for managing display data converted by the display control means Graphic display method of CAD, characterized in that it comprises a stage.