JP2747055B2 - Graphic display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic display device, and more particularly to a graphic display device capable of high-speed graphic display.

2. Description of the Related Art Conventionally, graphics are displayed by designating geometric information and non-geometric display attributes such as display color and the like for a graphic to be displayed. In addition, the required time required for display varies depending on how the display attribute is specified.

For this reason, when high-speed display is required, it is common to select and set a display attribute capable of performing high-speed display and display a graphic. However, in this method, it is necessary to reset the display attribute, and it is necessary to always execute the display attribute processing itself.

As a conventional technique capable of displaying graphics at high speed, for example, a technique described in Japanese Patent Application Laid-Open No. 61-151697 is known.

In this prior art, a simple figure for performing high-speed display is prepared, and when the display takes a long time, the display is completed within a predetermined time by displaying the simple figure. Things.

[Problems to be Solved by the Invention] The conventional technique has a problem that it is necessary to perform complicated processing such as rewriting of an attribute command and generation of a command sequence for high-speed display in order to perform high-speed display. In addition, there is a problem that it is difficult to display an accurate and detailed graphic at high speed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a graphic display device capable of displaying graphics at high speed without performing processing such as resetting display attributes and generating a high-speed command sequence. Is to provide.

[Means for Solving the Problems] According to the present invention, the object is as a graphic display mode,
A simple display mode is provided. In this mode, processing of a non-geometric attribute designation command is skipped, and display processing is performed only with a predetermined attribute. In this mode, for example, a line width command is set. This is achieved by simplifying the development of figures, such as displaying a one-dot line when a three-dot line is designated, displaying a circular arc with a folded line graphic, and the like.

Specifically, an object of the present invention is to provide a CPU that creates a display command sequence based on a command that defines a graphic and a display attribute command that specifies a display method of the graphic, a buffer that temporarily stores the display command sequence, A graphics processor for processing the display command sequence according to the instruction of the CPU to display a graphic, the graphics processor comprising a simple display mode for easily displaying a graphic, wherein the graphics processor comprises a CPU. A display mode notification mechanism for receiving a notification that the display mode is the simple display mode from the user, a display mode determination mechanism for determining the display mode from the notification, and a display for suppressing the processing of some or all of the display suppression commands based on the determination. An attribute command processing suppression mechanism and a simple display attribute setting mechanism for determining a display attribute in the simple display mode. For example, if the simple display mode is designated, without changing the display command sequence on the buffer it is achieved by displaying graphics easily.

[Operation] In the graphic display device according to the present invention, when the device is started in the simplified display mode, the processing of the non-geometric attribute command is skipped and the display is performed according to the predetermined attribute of the graphic definition command. Perform processing. Processing of a command, such as an arc command, which is displayed after being developed into a line segment sequence from a command parameter, coarsens the development into a line segment sequence and improves the display speed.

According to the present invention, a graphic can be displayed at high speed by performing the above-described processing.

Hereinafter, an embodiment of a graphic display device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing an example of a graphic command sequence, FIG. 3 is a flowchart illustrating the processing of a segment definition command, FIG. 4 is a flowchart illustrating the processing of an attribute command,
FIG. 5 is a flowchart for explaining the graphic definition command processing. In FIG. 1, 1 is a CPU, 2 is a main memory,
3 is a magnetic disk device, 4 is a system bus, 5 is a segment buffer, 6 is a graphic processor, and 7 is a display device.

In one embodiment of the present invention shown in FIG. 1, the CPU 1 operates an application program such as CAD and CAE using the main memory 2 to instruct the graphics processor 6 to display a graphic. The magnetic disk device 3 stores programs, data, and the like.
U1, the magnetic disk unit 3, the graphic processor 6, and the segment buffer 5 are connected to one another.

The segment buffer 5 is used as a communication area between the CPU 1 and the graphic processor 6, and stores a graphic command area 52 for storing a graphic command defining a display graphic.
A graphics processor activation notification area 51 for communicating activation information to the graphics processor 6. The graphic processor 6 executes a graphic display process based on the information given to the segment buffer 5 described above.

The graphics processor 6 includes a segment buffer 5
A FIFO 61 for taking in a graphic command from the CPU, a microprocessor 62 for executing a graphic display process, a local memory 63 for holding programs and data used by the microprocessor 62, and a start point and an end point of a line segment. It comprises a line segment generator 64 for writing line segments from information into a frame memory, a frame buffer 65 for holding image information of a display screen, and a local bus 66 for connecting these.

The line segment generator 64 includes a line segment attribute designation register (also referred to as a color register) 641 for holding a line segment color, that is, a value to be written to the frame buffer, and a line for holding a line segment type such as a solid line and a broken line. A segment attribute designation register such as a segment attribute designation register (line pattern register) 642 is provided. The display device 7 is connected to the frame buffer 65, and the image information in the frame buffer 65 is read out and displayed on the display device 7.

An example of a command sequence used in the present invention is shown in FIG. 2 and will be described below.

In the technical field related to graphic display, a graphic is generally managed in units of a group of figures called a certain group of segments, and a graphic command sequence 53 is used.
For example, as shown in FIG.
It consists of. The segment 531 starts with a segment definition command 5311 and ends with a segment end command 5311.
Ends at 21.

The segment definition command 5311 declares the start of a segment, and specifies the identification number of the segment and the next segment. The following coordinate conversion command 5312 is
Specifies the coordinate transformation for this segment. A line color command 5313 specifies a line segment color, and a line width command 5313.
14 is the line segment thickness, that is, whether the line segment is a one-dot line or n
Specifies the dot line (n = 2,3, ...). Further, the line type command 5315 specifies the type of the line segment such as whether the line is a solid line or a broken line, and the line segment sequence command 5316 specifies the coordinate position of the line sequence to be displayed.

Commands that specify the display method, such as these line color commands, line width commands, and line type commands, are called display attribute commands. In particular, display attribute commands that do not have a geometrical effect on the figure are non-geometric attribute commands. Call.

Commands 5317 to 5319 are commands for designating the same attributes as above for arc command 5320. The arc command 5320 displays an arc by giving information on a start point coordinate, an end point coordinate, a center coordinate, a radius, and a rotation direction, and displays an arc by approximating the arc with a broken line.

Hereinafter, a display attribute command and a command not shown in the figure for defining a display figure follow, and a segment end command comes at the end of the segment.

When the display processing of the segment 531 is completed, the processing shifts to the processing of the next segment 532.

The CPU 1 requests the graphic processor 6 to display a graphic in the following procedure.

First, the figure command area on the segment buffer 5
A graphic command sequence 53 is created in 52, a start mode is set in a start mode setting area 511 in the graphic processor start communication area 51, and then the graphic processor 6 is started.

The start mode includes three types of modes: a normal display mode, a simple display mode, and a partial simple display mode.
By setting 2, these modes are designated.
In the partial simple display mode, a segment to be accurately displayed without being simply displayed is designated by setting it in the segment setting area 512. This designation may be made by simply setting a segment to be displayed.

Next, the processing operation of the segment definition command will be described with reference to the flowchart shown in FIG. The processing program 81 operates in the microprocessor 62.

(1) First, the same processing as the processing of the segment definition command according to the prior art, such as storing the identification number of the segment and the address number of the next segment, is performed (step).
811).

(2) Subsequent processing is unique to the present invention. First, the start mode set as described above is determined with reference to the start mode setting area 511 (step 812).

(3) If the determination in step 812 is the normal display mode, the simple display flag 631 provided on the local memory 63
Is set to "0", and the process ends (step 818).

(4) If the judgment in step 812 is the simple display mode, the simple display flag 631 is set to "1", and the attributes in the simple display mode are set in the line segment attribute designation registers 641 and 642 of the line segment generator 64. . That is, the line color information in the simple display mode is stored in the line segment attribute specifying register 641 (color register), and the line type in the simple display mode, for example, the solid line is stored in the line attribute specifying register 642 (line pattern register). Set,
The process ends (steps 813 and 816).

(5) If the determination in step 812 is the partial simple display mode, reference is made to the segment designation area 512 to determine whether or not the own segment is registered in the area,
If it has been registered, the simple display flag 631 is set to "0", and the process ends (steps 814 and 817).

(6) If the own segment is not registered in the segment designation area in step 814, the simple display flag
631 is set to "1", and then the attribute in the simple display mode is set to the line segment generator 64 in the same manner as described above, and the process is terminated (steps 815 and 816).

As described above, in the processing of the segment definition command according to the embodiment of the present invention, when a simple display is performed, the simple display flag 631 is set to “1”, and the line segment generator 64 has the attribute of the simple display. The value is set in advance, and in the case of the partial simple display mode, it is determined whether or not the corresponding segment is set to the simple display.

Next, the processing 82 of the non-geometric attribute command executed by the microprocessor 62 will be described with reference to the flowchart shown in FIG.

(1) First, with reference to the simple display flag 631, it is determined whether or not it is instructed to perform a simple display of a graphic (step 821).

(2) If "1" is set in the simple display flag and the simple display is instructed in step 821, the remaining parameters of the command are discarded and the process is terminated (step 82).
3).

(3) If the simple display flag is set to “0” in step 821 to indicate that the display is not a simple display, the attribute value is stored in the current attribute table 85 in the same manner as in the normal display attribute command processing. Set to field. As a result, in the current attribute table 85, the latest attribute values such as the line color 851, line width 852, and line type 853 to be used in the display processing when the display is not a simple display are updated and stored (step S1). 822).

As described above, the process 82 of the command for designating the non-geometric display attribute is skipped when a simple display is performed.

The microprocessor 62 executes the line segment command processing after the processing of the processing 82 of the non-geometric attribute command described above is completed.

(4) First, a coordinate conversion process of a line segment sequence to be displayed, and
The clipping process is executed, and after this process is completed, it is determined whether or not the simple display flag 631 is instructed to perform the simple display of the graphic (steps 831 and 832).

(5) Step 832: If the simple display flag is set to "1" and the simple display is designated, the display attributes which are not set by the segment definition command 5311 and which are necessary for display are determined in advance. The set value, for example, the line width is set to a one-dot line capable of performing the fastest display (step 835).

(6) In step 832, if the simple display flag is set to “0” and it is instructed not to be a simple display, display attribute values such as line color, line width, and line type are fetched from the current attribute table 85, and It can be used in line segment generation processing (step 833).

(7) After the completion of step 833 or 835, the line segment generator
Executing the line segment drawing process using the step 64 (step 83
Four).

As described above, in the processing of the line segment command, when a simple display is instructed, a part or all of the display attribute setting processing can be omitted, and even when a thick line is specified, By displaying one dot line, the amount of processing for display can be reduced, and a high-speed display of a line segment can be performed.

Next, the processing 84 of the arc command 5320 performed by the microprocessor 62 will be described with reference to the flow shown in FIG.

(1) First, it is determined whether or not the simple display flag 631 is set. If the flag 631 is "1" and the simple display is instructed, the simple display flag 631 is set in advance for the simple display. A process for approximating a circular arc to a broken line with accuracy is performed (steps 841 and 846).

(2) If the simple display flag 631 is "0" in step 841, indicating that the display is not simple display, a process of approximating a circular arc to be displayed to a broken line with an accuracy corresponding to the radius is performed (step 841). 842).

(3) After the completion of steps 842 and 846, coordinate transformation processing and clipping processing are performed on the polygonal lines obtained by these processings. Further, steps 832, 833, and 835 in the line segment command processing 83 described above are performed. A similar attribute control process is executed (steps 843 and 844).

(4) The line segment is drawn by using the line segment generator 64 (step 834).

In the above-described arc display processing, in the case of a simple display, rough approximation of the arc can reduce the amount of display processing of the line segment sequence, and high-speed display can be performed.

The above-described position embodiment of the present invention can display a graphic to be displayed at high speed, and is particularly effective when applied to a CAD system or the like. That is, in FIG. 1, a CAD system can be configured by mounting a CAD program on the CPU 1 and operating the program.

In this case, in order to display the graphics at high speed, only the design target portion needs to be displayed accurately and the other portions simply displayed. For this reason, the CAD program uses the segment corresponding to the design target. , The graphic processor 6 may be activated in the partial simplified display mode.

The present invention can be applied not only to the CAD system as described above, but also to an interactive system such as a system for interactively designing and analyzing while displaying a figure and a system for creating a document.

[Effect of the Invention] As described above, according to the present invention, when a graphic is simply displayed, the processing time of a segment definition command increases, but a graphic definition command such as a display attribute command, a line segment command, or an arc command is used. Can be shortened, and since the frequency of appearance of the segment definition command is less than that of these commands, the overall processing time can be shortened.

Further, according to the present invention, since a graphic command for performing a simple display and a graphic command for performing a normal display can be simultaneously specified, only a specific portion can be accurately displayed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing an example of a graphic command sequence, FIG. 3 is a flow chart for explaining the processing of a segment definition command, and FIG.
FIG. 5 is a flowchart for explaining the processing of the attribute command, and FIG. 5 is a flowchart for explaining the graphic definition command processing. 1 CPU, 2 main memory, 3 magnetic disk device, 4 system bus, 5 segment buffer,
6 ... Graphic processor, 7 ... Display device.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiyuki Kuwana 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Omika Plant (56) References JP-A-63-85977 (JP, A) JP-A-63-85978 (JP, A) JP-A-63-70387 (JP, A) JP-A-59-119476 (JP, A)

Claims (3)

(57) [Claims] A CPU for generating a display command sequence based on a command for defining a graphic and a display attribute command for specifying a display method of the graphic; a buffer for temporarily storing the display command sequence; In a graphic display device including a graphics processor that displays a graphic by processing according to an instruction of a CPU, the graphic processor includes a simple display mode for easily displaying a graphic. A display mode notification mechanism for receiving a notification that there is a notification, a display mode determination mechanism for determining a display mode based on the notification, and a display attribute command processing suppression mechanism for suppressing the processing of some or all of the display suppression commands based on the determination. And a simple display attribute setting mechanism for determining a display attribute in the simple display mode. If the de is specified, without changing the display command sequence on the buffer, the graphic display device and displaying graphics easily. 2. A display system according to claim 1, wherein said display command sequence is provided with identification information for classifying the display command sequence into a simple display and a non-simple display. 2. The graphic display device according to claim 1, further comprising a segment simple display determination mechanism for determining whether to set a simple display mode or a normal display mode. 3. The graphic display device according to claim 1, wherein a part or all of the functions of said graphics processor are processed by said CPU.