JPS6261093A - Graphic display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a graphic display device, and particularly to a graphic display device that defines and stores graphics using a segment method.

[Background of the invention]

Conventional graphic display devices using the segment method include "Nikkei Electronics, July 29, 1985 issue, P. 141-161. "Comparing Workstation's multi-window method" (see especially P. 153)"
There is.

In this conventional example, the area of the display screen as a physical screen is specified by a specification called VEVOTE, and the area of a logical screen handled by software is specified by a specification called a window.

Windows on the logical screen and vevotes on the physical screen have a correspondence relationship with each other. On the other hand, let's define the image shape using segments.

The definition contents are stored in the segment I-buffer.

An example definition in the case where the figure as one segment in the segment buffer is 1 yen is as follows.

When drawing one circle, the center of the circle is '174 (x v y) the radius of the circle.'' As is clear from this definition, all figures to be displayed on the logical screen are defined in segment format, and this is stored in the segment buffer. It will be stored.

A certain area of the display screen under these conditions (Vueboat)
What is the 0-shape selection process? 1 When you specify an arbitrary position within the Vuevoto on the display screen, a graphic that exists as a segment on the logical screen corresponding to that Vuevoto is selected and displayed. The process of displaying one figure on the screen, which is the process of selecting one figure, is called picking.

Selection of such graphics requires searching the segment buffer. Search is a process of converting a point specified on the display screen into a position on a logical screen, and then checking for each segment whether there is a segment that includes the specified position on the logical screen. .

However, the number of segments in the segment buffer is the total number of graphics in the logical screen, which is extremely large. Therefore, since the search is performed segment by segment, the processing time from pick operation to completion for all segments becomes extremely long, resulting in a long response time.

[Purpose of the invention]

An object of the present invention is to provide a graphic display device with high pick responsiveness.

[Summary of the invention]

In the present invention, the number of segments to be searched at the time of a big search is limited. To enforce this restriction, the display screen is divided into multiple regions, and segment definitions for all shapes contained only within each region are created so that only the segments contained within the divided regions need to be explored. A storage area containing information is provided in the storage device as many as the number of divided areas, and when defining a window in a display screen and a window in a logical screen, display segment definition information for as many shapes as are included in the window. The process of storing data in the storage area corresponding to the divided area on the screen is performed, and when picking, the target segment can be found by searching only the storage area corresponding to the specified position coordinates on the display screen. This allows you to choose. To state this in an abstract way, the correspondence between the physical and logical positions of the segments is created in advance, and the segments targeted for big are restricted using physical (locational) locality.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention. The graphics display device includes a memory 12. Graphics processor 15.
CPU17. Frame memory 16° Display 18.
It consists of a common bus 19.

The memory 12 consists of a segment buffer 14 and a storage area 13 for physical areas.

The CPU 17 is a higher-level processor of the graphic processor 15, and performs higher-level arithmetic processing and various preset data sets necessary for graphic processing of the graphic processor 15.
Definition of segments, addition, deletion of segments,
The CPU 17 will define windows and ports.

The CPU 17 also starts up the graphic processor 15.

The graphics processor 15 performs graphic display processing.

This process refers to reading segment definition information from the segment buffer 14, displaying the segment definition information, and performing other various processes, and writing a display image to the frame memory 16.

The configuration of the memory 12 will be explained in detail.

Memory 12 constitutes a segment buffer 14 . An example of the segment buffer 14 is shown in FIG. 2(A).
defined above. The arrangement relationship on the logical screen is shown in FIG. 2 (c). Within the segment buffer 14, segments A-F are stored in the form of definition information. The format of the definition information is the same as in the conventional example.

In the segment buffer 14, a window 2 in the logical screen is also defined.On the other hand, in the display screen 3, a second
A VEVOTE 4 is defined as shown in FIG.

The display screen is divided into eight equal regions 11a to llh.

The memory 12 has eight storage areas 13a-13h corresponding to the eight divided areas 11a-11h. This is shown in FIG. 2(b), where the eight storage areas 13a to 13h are
In the figure, it is indicated by memory 13. Each storage area 13a-13
Each h stores a segment name included in the corresponding divided area. This "included" means that it includes not only the figure when all the figures in the divided area are included, but also the figure concerned when a part of the figure is included in one divided area.1 For example, the divided area (corresponding to memory 13a), it includes segments A and B, and the second
Data to that effect is stored in the memory 13a in FIG.

Next, the operation will be explained using FIG. 2 and FIGS. 3 to 5.

First, the processing flow for defining window 2 in logical screen 1 shown in FIG. 2 is shown in FIG. Segment A, B,
Add a mark (flag) to C. After this, check whether a veport is defined, and if it is not defined, it is finished, but if it is defined, each segment that exists in each divided area in the veport is The segment definition information is stored in the corresponding storage area. Specifically, since segments A and B exist in the divided area 11a, the segment definition information of segments A and H is stored in the storage area 13a in the storage device 13.The segment is stored in the primary divided area 11b. Since B and C exist, the same processing as above is performed for the following divided area 11c (■).

Similar processing is performed in the order of 118 (■), llf (■), and l1g (■), and as a result, segment definition information is stored for each storage area as in the storage device 13 in FIG.

Similar processing as shown in the processing flow shown in the fjS3 diagram is also performed when defining a virtual port. In addition, in the case of adding or deleting a segment, as shown in the processing flow of Figure 4 (a) and (b), if a window and a vuevoto are defined,
Addition/deletion processing of the corresponding segment is performed for each divided area in the Vuevot, and after 0 or more processes have been performed to add/delete segment definition information in the corresponding storage area, the pick operation is performed. The processing flow when this is done is shown in Figure @ 5. When a certain position A in the VEVOTE 4 on the 0 display screen is specified, the divided area 11b is created from the coordinates of that position.
is determined. In this embodiment, the position coordinates are converted to logical coordinates in the logical screen, and based on this, segment definition information B and C in the corresponding storage area 13b are checked, and segment B with matching coordinates is selected. In this case, whereas conventionally it would be necessary to check segments A to F during peak hours, it is now possible to check only segments B and C, reducing the response speed to one-third. If the figures are uniformly distributed on the screen, the response speed can be reduced to 1/8 or more on average. The addition and deletion of segments as shown in Fig. 4 can be done at high speed using the CPU 17 shown in Fig. 1, so there is no practical problem. Similarly, since only the segments corresponding to the physical area need be displayed, speeding up can be achieved.

〔Effect of the invention〕

According to the present invention, it is possible to reduce the response speed to one fraction of one screen even when the graphics to be changed are uniformly distributed on both sides of the display.

Furthermore, when only a portion of the total number of segments exists within the window, there is an effect that the response speed becomes faster on average by the ratio of the number of segments. In the case of the present invention, a new storage device that was previously unnecessary is required, but the cost increase due to this is negligible compared to the improvement in responsiveness because the price of storage elements is constantly falling rapidly.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention, and FIGS. 2 (a) and (b). (C) is an explanatory diagram of the memory and screen, FIGS. 3, 4 (A), and (B) are explanatory diagrams of the method of forming the memory 13, and FIG. 5 is an explanatory diagram of the BIC process. 12...Memory, 15...Graphic processor. 16... Frame memory, 13... CPU.

Claims (1)

[Claims] 1. Displaying only a window, which is a limited area on the logical screen, in a window port, which is a limited area on the display screen, and displaying an arbitrary position within the window port on the display screen. In a graphic display device that selects and displays the figure represented by the segment definition information existing at that position by specifying (picking) it, each division when the display screen is divided into multiple physical areas. A memory having a storage area corresponding to the area is provided, and all segment definition information contained in the window is stored in the corresponding storage area of the memory corresponding to the physical divided area in the window and vport when defining the area of the window and vpport. A graphic display device stores the segment definition information, searches only a storage area corresponding to a divided area at a designated position of the pick at the time of picking, reads out the contents, and selects and displays a graphic of the read segment definition information.