JPH0291773A - Graphic display device - Google Patents

Abstract

PURPOSE:To attain efficient graphic displaying in accordance with the resolution of a graphic display device by retrieving the graphic data from a graphic data base, selecting the graphic data for displaying from the retrieved graphic data and displaying the graphic data. CONSTITUTION:From a graphic data base 2, the graphic data are retrieved, by being designated from a keyboard 5 with a user, the graphic data for graphic display is selected with a displaying data selecting means from the retrieved graphic data and temporarily stored into a memory 3. Namely, from the coordinate system of the graphic data designated by a user and the resolution of a graphic display device 4, the conditions selecting the displaying data are automatically determined and by using the conditions, the displaying data is selected from the graphic data retrieved by a user and the display is executed. Thus, the graphic data selecting conditions are automatically determined, further, by using the conditions, the accuracy of the displaying data is selected and thus, the processing efficiency of the displaying can be improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Use Minute Hand) This invention sets the selection conditions and selects the percentage display data, so that the data of the amount of +f + ft is required for the disaster indicator lid of the figure. The present invention relates to a graphic display device that displays.

(Prior art) When all the specified graphic data is displayed on a device that displays graphic data such as a map, depending on the level of consideration of the graphic display device, the same pixel may be overlaid many times, reducing the display processing efficiency. Significantly decreased. Furthermore, when selecting and displaying graphic data, selection conditions are often determined by trial and error while considering one display screen, which is inefficient.

In other words, in conventional graphic display devices, by displaying all detailed data without considering the degree of resolution, processing efficiency is low, such as displaying the same pixel over and over again, and 1'4 of it is lost. There was a problem of inefficiency, such as determining the graphic data selection conditions by trial and error (problem to be solved by the invention).As mentioned above, in the conventional graphic ammonium water device 1c, f!
Since it does not take into account the size of the 4 degrees and the graphic data, it has the disadvantage of poor carbon and water efficiency.

This invention automatically determines the graphic data selection conditions based on the coordinate system of the figure and the screen resolvability of the graphic display device, and depending on the purpose of use, provides a threshold value for the graphic data selection conditions to display the graphic data. The purpose of this invention is to provide a device for displaying.

[Structure of the invention]

(Means for solving problems) This graphic display device according to Haruo includes a graphic database database, a search means for searching graphic data from the graphic database,
By providing a means for selecting graphic data for display from the retrieved graphic data and a means for displaying the selected graphic data, a graphic display device solution@! The system is designed to display graphics efficiently depending on the situation.

(Operation) In this invention, graphic data is searched from the graphic database by adding 1'W to the user, and graphic data for display is selected from the retrieved graphic data using the display data selection means and temporarily stored.

Specifically, conditions for selecting display data are automatically determined based on the coordinate system and screen of the graphic display device specified by the user, and using these conditions, the graphic data searched by the user is Display data is selected from the data and one display is performed.

By automatically determining the graphic data selection conditions in this manner and further selecting the precision or coarseness of display data using these conditions, display processing efficiency is improved.

(Example) Hereinafter, an example of the present invention will be described using the drawings. 1st
The figure shows a schematic configuration of a graphic display device according to an embodiment of the present invention.

! The arithmetic and control unit 1 (CPU) shown at 8 in FIG. 1 is a part that controls the entire graphic display apparatus, and also performs general-purpose calculations. The graphic database 2 stores graphic data such as maps.

The coordinates of the points of the polygons forming the figure and the attributes of the points (
Information indicating the start point or end point) is stored. The storage format of graphic data in this graphic database 2 is shown in FIG. The attribute of a point is ρ1 if the point is a starting point (S), an ending point (6), or a passing point p) of a polygon. The coordinates of the points are expressed in normalized loci.

From the graphic data of the display data candidate designated via the keyboard 5, the coordinate system of the graphic data is determined. Then, using the coordinate system and the degree of resolution e of the display eccentricity 4 for displaying the graphic data, the CPU determines graphic data selection conditions. Then, from the graphic data retrieved from the graphic database 2, data that meets the graphic data selection conditions is selected and temporarily stored in the memory 3 used as a buffer memory. Then, it is output to the public display system [it4]. This is, for example, a CRT display. The keyboard 5 is used for interaction between the user and the user.

Figure 3 is a flowchart showing the flow of graphic display processing that is outdated in this implementation ψ1].

Let the yjV+1 quadrant of the graphic display device be an NXN picture.

In actual processing, the user first inputs the ζ file name via the keyboard 5 and designates the display data (step 11).
) Next, the coordinate system of the display data is as shown in Figure 4 (Q
, n)M(0,n) and the information that the resolution of the graphic display device is NXN as shown in FIG. The direct character of Mgl series is -. (Step 12) Accordingly, (the figure selection condition is figure data (X6*)'o) as the reference point, s
If we look at (xI *3't), the condition for its establishment is that it satisfies this formula.

By the way, - is automatically determined as the default, but depending on the purpose, a rough figure may be displayed and a sound with a good temperature may be considered (step 13). Therefore, the user can determine a new figure selection condition by inputting the parameter α using the keyboard 5 (step 14).

Next, graphic data is read out one by one from the graphic database 2 under the control of the CPUI (step 15). Then, it is checked whether the pixel of the graphic data is the starting point or the ending point of the polyline (step 16). If so, the data is transferred to the memory 31C and temporarily stored as a display point. At this time, this data is used as a reference point (step 18).

If it is a point on the pond, apply it to the shape selection condition (step 17). At this time, 1. Check the combination of that data and the reference point. If the condition is met, the data will be displayed as a display point. This is stored in memory and used as a new reference point (Snap 18).

After completing all the shape data (Step 1)
9), The data in the memory is manually transferred to the display device 4 (step 20). Data is also output from the memory to the figure database 2 for redisplay (step 21), and useless data is displayed by the process in C. In addition, steps 12 to 19 can be avoided when redisplaying, and high-speed display is possible.

Here, we used the %1 foot formula, which is the square formula, ∆x3 + ∆ytomi〉□ N! stomach.

〔Effect of the invention〕

According to this invention, conditions for selecting unnecessary graphic data for display can be automatically derived from the coordinate system of graphic data specified by the user and the W4 dawn of the hazy display device.

Also, from the graphic data retrieved from the IE storage device,
Data that meets these conditions can be selected and displayed efficiently. Furthermore, when the graphic data is redisplayed, the display data is the graphic data that has already been optimally selected, so that rapid display is possible.

Therefore, for example, when digitized graphical data is displayed as a large-scale map using a small-scale map as a counterpoint, and the purpose is to re-display it as data for simulation, an efficient data waiting queue is required. This makes it possible to shimmy and display images at high speed.

4. Piigmatic explanation of the drawings FIG. 1 is a block diagram of a graphic display device according to an embodiment of the present invention, FIG. 2 is a diagram showing the storage format of graphic data, and FIG. 3 is a graphic display in the same embodiment. 4 is a diagram of the coordinate system of the percentage display data, and FIG. 5 is a diagram of the P4□□□ degree of the figure display skin.

1... Arithmetic suppression device, 2... Graphical database,
3...Memory, 4...Display device% 5...Keyboard.

Figure 1 Agent Patent Attorney Rule Chika M Right Same as Mitsuyuki Matsuyama Figure 2 No. figure No. figure

Claims (2)

[Claims] (1) means for searching graphic data from a graphic database; means for determining selection conditions based on the coordinate system and display resolution of the searched graphic data; and means for determining the searched graphic data using the determined selection conditions. 1. A graphic display device comprising: means for selecting a coordinate point to be displayed from among the coordinate points; and means for displaying a corresponding graphic according to the selected coordinate point. (2) The graphic display device according to claim 1, wherein the selection condition is multiplied by an appropriate parameter depending on the precision or coarseness of the graphic to be displayed.