JPH0455885A - Digital map display device - Google Patents

Abstract

PURPOSE:To allow smooth scroll, magnification and reduction operations by previously reading out and developing the data for the entire area of a map in a large-capacity frame memory from an optical disk at one time first, then displaying the data directly on a CRT monitor from a small-capacity frame memory during the time when the operation is made. CONSTITUTION:The large-capacity frame memory 9 which stores the screen data for the entire area of the map read out at the time of making the magnification, reduction and scroll operations as bit map data and the small-capacity frame memory 8 which stores the screen data read out of the main memory 2 in order to redraw the screen determined after the operation are provided. A switching section 11 which reads the data out of the large-capacity frame memory 9 and the small-capacity frame memory 8 and transmits the data to a display section 13 is provided. The smooth magnification, reduction and scroll are executed in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a digital map display device, and particularly to a digital map display device that displays contour lines,
The present invention relates to a digital map display device that draws roads, rivers, lakes, etc. using vectors, characters, symbols, etc. using fonts, and fields, etc. using fill-in colors.

[Conventional technology]

Conventionally, when displaying digital maps by enlarging, reducing, and scrolling operations, contour lines are used to draw a map screen that changes according to the operations such as enlarging, reducing, and scrolling when operating a mouse or the like.

Roads, rivers, lakes, etc. were redrawn and displayed one after another as vectors, characters, symbols, etc. were redrawn using fonts, and lakes, marshes, land use, etc. were filled in according to the movement of the screen.

[Problem to be solved by the invention]

In the conventional digital map redrawing display method mentioned above,
Even if you perform operations such as enlarging, reducing, scrolling, etc., the internal processing of enlarging, reducing, scrolling, etc. is performed by software, so the processing speed is slow, so smooth enlarging, reducing, and scrolling operations cannot be obtained. In addition, in the case of map information such as lakes and marshes that is drawn on the screen in a filled manner, the processing speed cannot keep up with it, so there is a problem that operations such as enlarging, reducing, scrolling, etc. are difficult.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a digital map display device that can smoothly enlarge, reduce, and scroll.

[Means to solve the problem]

The digital map display device of the present invention includes an optical disc storing digital map data, a frame memory storing the digital map data read from the optical disc via the main memory of a CPU, and a map read from the frame memory. In a digital map display device comprising a display section for displaying data, and in which enlarging, reducing, and scrolling operations are performed on a map screen displayed on the display section, (A) when performing enlarging, reducing, and scrolling operations; (B) A large-capacity frame memory that stores screen data for the entire area of the read map as bitmap data; (B) A screen that is read out from the main memory again in order to redraw a predetermined screen after enlargement, reduction, and scrolling operations; a small-capacity frame memory for storing data; (C) when enlarging, reducing, and scrolling operations are performed, data is read from the large-capacity frame memory and sent to the display section; When redrawing a predetermined screen after a 4X and scrolling operation, a switching unit is provided which switches a frame memory from which data is read, reads data from the small-capacity frame memory, and sends it to the display unit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The digital map display device shown in FIG. 1 includes a CPU, a main memory 2 for storing map data, a CPU bus 3, an optical disk 4 for storing map data, an optical disk control gB section 5, and a graphic for generating vectors and fill data. Generator 6, Kanji + AN K Ca1
pba-nu'rier1c and Kana: A font generator 7 that generates alphabets, numbers, kana) and symbols, and one screen that is read out from the main memory 2 again to redraw a predetermined screen after enlargement, reduction, and scrolling operations. a small-capacity frame memory 8 for storing screen data of , and a large-capacity frame memory 9 for storing screen data for the entire map area read out when enlarging, reducing, and scrolling operations are performed as bitmap data.
, enlargement, reduction, and scroll When enlargement, reduction, and scrolling processing is performed by IIRT, data is read from the large-capacity frame memory 9 and sent to the display section 13 via the RGB signal generation section 12, and after the enlargement, reduction, and scrolling operations are performed. When redrawing a fixed screen, the frame memory from which the data is read is switched, data is read from the small capacity frame memory 8, the RGB signal generation section 2 and the display section 13
A switching unit 11 that switches between reading data from the small-capacity frame memory 8 and the large-capacity frame memory 9 under control from the CPU via the control line 10, and a CRT monitor that displays screen data. 13. An RGB signal generation subcommittee that generates RGB signals for displaying screen data on a CRT monitor; 2 a mouse 14 for performing operations such as crawling, enlargement, and reduction; and a mouse control section 15 for controlling the mouse 14; ing.

Next, the operation will be explained.

When the digital map display device shown in FIG. 1 is first started up, the CPU 1 displays contour lines and roads.

Vector data such as rivers, lakes, etc., mesh data such as land use and soil distribution, character data such as place names, etc. are read from the optical disk 4 via the optical disk controller 5 to the small capacity frame memory 8 and the large capacity frame memory 9, and further C
Via the PU bus 3, a graphic generator 6 generates vectors of contour lines, roads, rivers, lakes, etc., and expands them to a small-capacity frame memory 8 and a large-capacity frame memory 9. At this time, screen data for one screen is read out to the small capacity frame memory 8, and data for the entire map is read out to the large capacity frame memory 9.

In the case of map data such as land use that is drawn on the screen by filling, the filling data is generated by the graphic generator 6 according to the definition data stored in the main memory 2 via the CPU bus 3, and then transferred to the small-capacity frame memory. 8 and large capacity frame memory 9.

Data such as place names are sent via the CPU bus 3 to a font generator 7 which generates characters used for place names and is expanded into a small capacity frame memory 8 and a large capacity frame memory 9. Data for one screen is expanded to the small-capacity frame memory 8, but data for the entire area held by the optical disk 4 is expanded as a pit map to the large-capacity frame memory 9, so the data size is reduced by the difference in memory capacity. It takes more time to expand than it takes to expand into the capacity frame memory 8.

At the same time as writing to the small capacity frame memory 8, the switching unit 1
1 reads data from the small capacity frame memory 8, and R
The GB signal generation subcommittee 2 draws a map on the CRT monitor 13. While data in the entire area held by the optical disk 4 is being expanded to the large-capacity frame memory 9,
The CRT monitor 13 uses one screen worth of data read from the small capacity frame memory 8 where the data is expanded quickly.
Draw a map on . However, in this case, since only one screen's worth of data is displayed on the screen, enlargement, reduction, and scrolling cannot be performed.

Next, when the data has been expanded to the large-capacity frame memory 9, the bitmap data for the entire map on the large-capacity frame memory 9 can be immediately read out, so that enlargement, reduction, and scrolling modes can be performed. It becomes like this. When the enlargement, reduction, and scroll modes are selected, the switching section 11 switches to reading from the large-capacity frame memory 9, and reads data from the large-capacity frame memory 9 in response to an instruction from the mouse 14 via the mouse control section 15. By changing the read address for one screen, C
The map drawn on the RT monitor 13 is scrolled and the contents of the mouse 14 instruction are stored in the main memory 2. Further, by performing processing such as thinning out read addresses from the large capacity frame memory 9, the drawn map is enlarged or reduced. Then, data is read out from the optical disk 4 again at the position on the screen determined by the scrolling operation, and at a scale enlarged or reduced according to the instruction contents of the mouse 14 stored in the main memory 2 and stored in the small capacity frame memory 8. expand.

When the modes such as enlargement, reduction, and scrolling are completed, the switching unit 11 switches to reading from the small capacity frame memory 8 under control from the CPU via the control line 10. Since the map screen is redrawn using drawing data such as vectors, fonts, and fills developed in can be displayed.

〔Effect of the invention〕

As explained above, the present invention first reads and expands the data for the entire area of the map from the optical disk to the large-capacity frame memory, and then, while performing operations such as enlarging, reducing, scrolling, etc. RGB from capacity frame memory
By displaying directly on the CRT monitor via the signal generation unit, the display can be performed faster than the readout operation by software, so processes such as enlargement, reduction, and scrolling can be processed at high speed, and drawing with fill-in is possible. This has the advantage that smooth scrolling, enlargement, and reduction operations can be performed even when map information is displayed.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention. ■・・・CPU12・・・Main memory,
3... CPU bus, 4... Optical disk, 5... Optical disk control section, 6... Graphic generator, 7... Font generator , 8...Small capacity frame memory, 9
......Large capacity frame memory, 10...
Control line, 11...Switching section, 12...R
GB signal generation unit, 13...CRT monitor, 14
... Mouse, 15 ... Mouse control section. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] 1. An optical disc storing digital map data, a frame memory storing the digital map data read from the optical disc via the main memory of a CPU, and map data read from the frame memory. In a digital map display device, the digital map display device is equipped with a display unit that displays a map screen displayed on the display unit, and in which enlarging, reducing, and scrolling operations are performed on the map screen displayed on the display unit, a large-capacity frame memory that stores screen data for the entire area of the map to be displayed as bitmap data; (B) screen data that is read out from the main memory again in order to redraw a predetermined screen after enlargement, reduction, and scrolling operations; (C) When enlarging, reducing, and scrolling operations are performed, data is read from the large-capacity frame memory and sent to the display section, and the data is enlarged, reduced, and scrolled. A switching unit that switches a frame memory from which data is read when redrawing a predetermined screen after a scroll operation, reads data from the small capacity frame memory, and sends the data to the display unit. Map display device. 2. The digital map display device according to claim 1,
A digital map display device characterized in that the small capacity frame memory stores screen data for one screen that is read out from the main memory in order to redraw a predetermined screen after enlargement, reduction, and scrolling operations.