JPH1165430A - Map zooming display method and its map zooming display device, and computer for map zooming display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a high-speed, continuous zooming display of a map (continuous enlargement or reduction) when the map is displayed. SOLUTION: The device is equipped with a map data base 43 consisting of maps having scale levels at, for example, double-scale intervals, an expanding process means 40 which has two map drawing areas 44A and 44B, i.e., an area where a display map is drawn and an area where a preread map is drawn on a memory 44 and expands image data when transferring the display map to a VRAM, an expansion rate calculating means 49 which determines the expansion rate of the image data, a scale level judging means 46 which judges the scale level of a map (preread map) considered to be needed next as a display map from the direction of zooming (continuous enlargement or reduction), a map dividing and drawing means 47 which divides the preread map into rectangular areas and draws them, and a display map switching means 48 which judges which of the two map drawing areas the map to be displayed is drawn in and takes image information of the map out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map drawing processing device for drawing a map, and more particularly to a map zooming display method and a map zooming display device and a map zooming display device capable of high-speed and continuous zooming display of a map. Related to a personal computer.

[0002]

2. Description of the Related Art When a conventional map drawing processing apparatus draws a map at a certain scale level, for example, data of the corresponding scale level is obtained from a map database composed of a plurality of scale level maps at intervals of 2.0 times. A map is drawn by enlarging the read data to an arbitrary magnification on a memory set as a reading and map drawing area, and an image of the drawn map is transferred to a VRAM to display the map.

FIG. 4 is a block diagram showing a configuration of a conventional map drawing processing apparatus. The map drawing device 1 is an external input device 2
And the external output device 3. The drawing information input from the external input device 2 is input to the map drawing means 12 by the input means 11. The map drawing means 12 draws a map in the map drawing area 14 with reference to the map database 13 based on the map information. The drawn map image is output to the external output device 3 by the output means 15.

When realizing zooming (continuous enlargement or reduction) display using such a map drawing device 1, the scale level and magnification input from the external input device 2 are shifted little by little in the direction in which zooming is desired. However, it was necessary to repeat the above process.

[0005]

However, in the processing method based on the configuration of the conventional map drawing processing apparatus, in the zoom display of the map, even when the magnification is slightly changed at the same scale level, the map data is read from the map data. Since all steps from drawing to output to an external output device must be executed, processing takes time, and it is difficult to perform high-speed and continuous zoom drawing.

An object of the present invention is to solve such problems in the prior art, and an object of the present invention is to enable high-speed zoom display of a map.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a map database composed of maps of a plurality of scale levels, and a scale level of a look-ahead map which will be required next as a display map. Scale level determining means for determining from a continuous enlargement or reduction direction, map division drawing means for dividing the prefetch map into a plurality of rectangular areas and drawing, and a map to be displayed in two map drawing areas. Display map switching means for judging on which side the map is drawn and extracting map image information; and two map drawing areas, a region for drawing the display map and a region for drawing the look-ahead map on a memory. Decompression processing means which has an area and decompresses image data when transferring a display map to a working memory; and decompression which determines a decompression rate of the image data. And calculation means performs normal map drawing based on the input information and a map drawing means.

According to the present invention, two display maps and a look-ahead map on the memory are prepared, and an image obtained by expanding the display map drawn in the display map drawing area by the expansion processing means is displayed. In the meantime, the map of the scale level determined by the scale level determination means is divided and drawn by the map division drawing means for the pre-reading map drawing area little by little, and the map of the next required scale level is set in advance. By continuously performing the prepared processing, there is an effect that continuous and high-speed zooming display can be performed.

Further, since the image once drawn is used and the image is expanded and displayed by the expansion processing means,
Since reading processing of a map and drawing processing of a shape are not performed, there is an effect that high-speed arbitrary magnification display can be performed.

[0010] Further, since the map of the next required scale level is divided and drawn little by little by the map division drawing means while the arbitrary magnification map is being displayed, the drawing processing time can be shortened. This has the effect of enabling smooth zooming display.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a map zooming display device for implementing a map zooming display method according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 2 denotes an external input device,
It is an input operation device of a keyboard or tablet or a computer which sends out input information such as coordinates and scale level, magnification and zooming direction of the map to be displayed.

Reference numeral 3 denotes an external output device, which comprises, for example, a storage device for storing image information of a map from the map drawing device 4 in a map zooming display device described later, a monitor device for displaying the image on a screen, a computer, and the like.

Reference numeral 4 denotes a map drawing device in a map zooming display device. The map drawing device expands and displays a drawn map image, and in the meantime, pre-draws and draws a map of the next required scale level little by little to thereby draw a high-speed map. Zooming is performed.

The map drawing device 4 has an input means 41 for performing interface processing with the external input device 2 and a map database based on input information from the input means 41.
A map drawing means 42 for drawing a normal map based on the map information from 43 is provided.

The map drawing device 4 has input means.
Based on the input information from 41, at the time of zooming, a scale level determining means 46 for judging the scale level of the look-ahead map considered to be necessary as the display map from the zooming direction and a plurality of rectangular areas And a map division drawing means 47 for dividing and drawing the image. Further, the map to be displayed has two map drawing areas (memory) 44 in area 1 (44A).
And the area 2 (44B), and a display map switching means 48 for extracting the image information of the map.

The map drawing device 4 includes an expansion rate calculating means 49 for calculating an expansion rate of a map drawing image at the time of zooming, and a map drawing area 44 actually extracted by the display map switching means 48. Map drawing area 1 (44A)
And expansion means 40 for expanding the image from the area 2 (44B), and output means 45 for outputting image information from the expansion processing means 40 or the display map switching means 48.

FIG. 2 is a block diagram showing a configuration when the map zooming display device shown in FIG. 1 is implemented in a computer. In FIG. 2, this example is a central processing unit (CP
A ROM 21 storing a program and a working RAM 22 are connected to U) 20. A keyboard (tablet) is connected to the CPU 20 through an input / output circuit (I / O) 23-1.
24 is connected, and a cathode ray tube (CR) displaying input data from the keyboard 24 and a drawn map through the I / O 23-2
T) 25 is connected. Furthermore, in this example I / O23-
Hard disk drive (HDD) 26 and CD-ROM drive 2 for storing map data and the like through I / O 23-4 and I / O 23-4
7. Further, a floppy disk drive (FDD) 28 for sending stored data to the CPU 20 through the I / O 23-5 and storing drawing data and the like is provided. In this example, a VRAM 29 for storing image data to be displayed on a screen is connected to the CPU 20.

Next, the operation of this embodiment will be described.

FIG. 3 is a flowchart showing a processing procedure of the operation of the first embodiment. 1 to 3, map drawing information (drawing center coordinates, scale level, drawing magnification, etc.), zooming information (zooming direction, etc.) and the like are taken into the input means 41 from the external input device 2. In the case of normal map drawing, based on the map drawing information taken into the input means 41,
The map drawing means 42 refers to the map database 43 to perform a map drawing process on the map drawing area 44A or the map drawing area 44B. The drawn map image is output to the external output device 3 by the output means 45.

In the case of the zooming display, the zooming information taken into the input means 41 is output to the scale level judging means 46 (S1). The scale level determination means 46 determines the scale level and magnification of the map drawn in the map drawing area 44A for display or the map drawing area 44B for prefetch, and the scale level and magnification of the map to be prefetched from the zooming direction. Judge and output to map division drawing means 47 (S2).

Next, the map dividing and drawing means 47 determines whether or not the prefetching of the map has been completed (S3). If not, the map dividing and drawing means 47 stores the map in the map drawing area 44B set as the prefetching map drawing area. On the other hand, one step of divisional drawing of the map is executed (S4). The display map switching means 48 includes a scale level and a magnification of a map to be displayed next and a scale level determination means.
Compare the scale level and magnification determined by 46 (S
5) If it is determined that the scale level and magnification of the map to be displayed next are equivalent to the scale level and magnification determined by the scale level determination means 46, the map drawing area 44A for display or the look-ahead Is switched to the map drawing area 44B (S6).

The expansion rate calculating means 49 calculates the expansion rate from the scale level and magnification of the map drawn in the map drawing area 44A for display or the map drawing area 44B for prefetch and the scale level and magnification to be displayed next. Is calculated and output to the decompression processing means 40 (S7). Decompression processing means 40 is a map drawing area for display.
The map image drawn on the map drawing area 44A or the map drawing area 44B for prefetching is expanded according to the expansion rate calculated by the expansion rate calculating means 49, and is output to the output means 45 (S8). The output means 45 outputs the map image output from the decompression processing means 40 to the external output device 3 (S9).

As described above, in the first embodiment, the two map drawing areas on the memory are used separately for display and for prefetching, and the display map drawn in the display map drawing area is expanded. While the image expanded by the processing means 40 is displayed, the map of the scale level determined by the scale level determination means 46 is drawn little by little with respect to the pre-reading map drawing area by the map division drawing means 47. A continuous and high-speed zooming display is performed by continuously executing a series of processes of preparing a map of a reduced scale required for the same in advance.

[0026]

As described above, according to the present invention, while the image of the already drawn map is enlarged and displayed at an arbitrary magnification by the decompression processing means, the map of the next necessary scale level is gradually added. By drawing, the drawing processing time can be reduced, and smooth zooming of the map can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a map zooming display device that implements a map zooming display method according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram of a configuration when the map zooming display device shown in FIG. 1 is implemented in a computer.

FIG. 3 is a flowchart illustrating an operation procedure according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional map drawing device.

[Explanation of symbols]

2: external input device, 3: external output device, 4: map drawing device, 20: CPU, 21: ROM, 22: RAM,
23 ... I / O, 24 ... Keyboard, 25 ... CRT, 26 ...
HDD 27 CD-ROM 28 FDD 40 Decompression processing means 41 Input means 42 Map drawing means 43
… Map database, 44… Map drawing area (memory),
45 ... output means, 46 ... scale level determination means, 47 ... map division drawing means, 48 ... display map switching means, 49
... Elongation rate calculating means.

Claims (5)

[Claims] 1. A display map and a look-ahead map are prepared, and while a display map drawn image is drawn in the display map drawing area, an image obtained by expanding the map is displayed little by little. In this way, continuous and high-speed zooming display is performed by successively executing a process of preparing a map of the required scale level in advance by dividing and drawing a map of the reduced scale determined on a scale basis. Map zooming display method. 2. A map database comprising a plurality of scale-level maps, and a scale level for judging a scale level of a look-ahead map which is considered to be required next as a display map from a continuous enlargement or reduction direction. Judgment means;
Map division drawing means for dividing the look-ahead map into a plurality of rectangular areas and drawing the map; and determining which of the two map drawing areas the map to be displayed is drawn, and extracting map image information. Display map switching means, and two map drawing areas on the memory, the area for drawing the display map and the area for drawing the look-ahead map, which are used when transferring the display map to the working memory. Decompression processing means for decompressing data, decompression rate calculation means for determining the decompression rate of the image data, and map drawing means for performing normal map drawing based on input information, for continuous and high-speed zoom display A map zooming display device characterized by performing. 3. The map zooming display device according to claim 2, wherein a high-speed arbitrary magnification display of the map can be performed by expanding and displaying the already drawn image of the map by the expansion processing means. 4. While the arbitrary scale map is being displayed, the map of the scale level determined by the scale level determining unit is slightly reduced by the map division drawing unit with respect to the pre-reading map drawing area. The map zooming display device according to claim 2 or 3, wherein a smooth zooming can be performed by drawing each time and preparing a map to be displayed next in advance. 5. A first memory for storing map data or the like,
A second memory for storing drawing data and the like, a third memory for storing image data and the like, and a central processing unit;
A computer for a map zooming display device, wherein the central processing unit controls data stored in each of the memories based on the map zooming display method according to claim 1 and displays the data on a display device.