JPH0527876B2 - - Google Patents

Description

[Detailed description of the invention]

(Technical Field) The present invention relates to a graphic display device using a graphic CRT display device, and more particularly to a display information processing method. (Prior art and problems) Graphic CRT display devices have higher accuracy (resolution) of user-manageable information than conventional character-type display devices, and can display complex and precise information, which is required for various systems. As their functions become more sophisticated, their applications have expanded, and they are still used in a wide variety of applications, including image processing, CAD/CAM, and animation. Among the graphic display devices using this graphic CRT display device, the device mainly targeted by the present invention is
Like CAD/CAM, line figures are displayed, but CAD/CAM differs greatly from CAD/CAM.
In CAM, the display target is a single closed figure, whereas in the present invention, the display target is applied to the display of figures that are widely distributed on a plane. For example, for graphical information distributed discretely on topography, it can be applied to extract graphical information in a designated area from the information covering the entire area and display the graphical information on a CRT display device based on the information. It is something to do. An example of the configuration of a graphic display device using a graphic CRT display device is shown in FIG. Host computer system A includes host computer 1 and storage device 2.
and an interface 3-1, and for graphical display, the desired display information is retrieved from the storage device 2 under the control of the host computer 1 and sent to the graphic CRT display device B via the interface 3-1.
give to CRT display device B includes an interface 3-2, a display processor 4, a video memory 5, a monitor 6, and a picture memory 7.
The processor 4 receives display information from the host computer system A through the interface 3-2.
The image is displayed as a graphic on the monitor 6 under the control of. In such a graphic display device, when the host computer 1 receives a display request for a partial area of display information, the conventional display processing outline is as follows. (i) The host computer 1 uses the area information instructed to be displayed to calculate the coordinate values of the area of the display information to be transmitted to the graphic CRT display device B. (ii) The host computer 1 searches for display information contained within the above area. (iii) The host computer 1 performs processing such as coordinate transformation and information editing on the searched display information, and then transfers it to the graphic CRT display device B. (iv) The display processor 4 constructs the received display information into a database within the graphic CRT display device and stores it in the picture memory 7. (v) The display processor 4 processes information stored in the picture memory 7 and performs control to develop it on the video memory 5. This deployment uses special internal hardware. (vi) The bit image developed on the video memory 5 is displayed as a figure on the monitor 6. These conventional processing methods have a problem in that the processing time from the display request to the display completion is long.
There are two reasons for this: (1) This is mainly due to the processing capacity of the display processor, but it takes time to transfer information between the host computer system A and the graphic CRT display device B. (2) The search for display information performed by the host computer 1 takes time because it searches for information located within an arbitrary small area from a huge amount of display information distributed over a surface area. In the above-mentioned problem, display information processing of a figure whose display targets are dispersed will be specifically described below. Each element of display information within the area that spreads over the area has coordinate information for indicating the position within the area. Each coordinate is set as a distance from the origin when one point within the area is the origin (hereinafter referred to as absolute coordinates). Therefore, the data structure of each display information is
As shown in Table 1 below, data that gives meaning to absolute coordinates X, Y, information type, color, attributes, etc. DATA
The display information as a whole is a collection of these.

【table】

Claims (1)

[Claims] 1. Display information of a figure that spreads over a surface is stored in a storage device as digital information, a processing device extracts display information of a partial figure that is requested to be displayed from the above storage device, and displays the extracted display information as a figure. A graphics display device for displaying on a graphics CRT display device, in which the storage device stores graphics as a group of display information divided into rectangular areas of the same size, and the display information spans two adjacent rectangular areas. The above process extracts the display information related to the designated display area from the rectangle identification number attached to the rectangular area and performs the extraction. A graphic display device that extracts display information having the above-mentioned classification symbol from a group of display information included in a rectangular area adjacent to a rectangular area to be provided as display information related to a designated display area.