JP2799502B2 - Display device graphic display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a graphic display system capable of scrolling and displaying graphics in a wide range in real time in a display device for displaying graphics such as maps and circuit diagrams by a computer. It is about.

(Prior art)

FIG. 5 is a configuration diagram showing a schematic configuration of a display device for displaying a map, a circuit diagram, and the like by the computer. The contents of the map data are not dot information but code information,
Read from DC-ROM etc. 18 and V / RAM only necessary parts
(Video random access memory). This V.RAM is V.RAM-A13 and V.R
AM-B14, on the other hand, for example, VR
The map developed on AM-A13 is displayed on the map display device 17. When the outside of the display portion 13a exceeds the limit of the map developed on the V-RAM-A13, the subsequent map is read from the CD-ROM or the like 18 and the map data is developed on the other V-RAM-B14. Is done. Also, the V · RA selected by the switching device 16
The map developed in M is displayed on the map display device 17.

FIG. 6 is a diagram showing a configuration of one piece of map data. In the figure, a is a map data number, and each portion is composed of nine portions having a size substantially equal to the display portion of the map display device 17 per one piece of map data.

In the above configuration display method, map data read from a CD-ROM or the like 18 is developed in one of the V-RAMs, for example, the V-RAM-A13. Then, the map is displayed on the map display device 17. When the map is scrolled by an operation of the operator or the like, the outside of the display portion 13a eventually becomes V-RAM-
It reaches the limit of the map developed in A13. At that time CD-ROM etc.
V is displaying one map data from 18 and displaying it.
・ Expand to RAM-A13. The necessary part is copied from the V-RAM-B14. This operation is performed for necessary map data. This example is shown in FIG. In this figure, the V-RAM currently being displayed is set to V-RAM-A13, and scrolling is performed as shown in (a), and the outside of the display portion 13a reaches the limit of the map developed on the V-RAM-A13. When,
As shown in (b), the map data 2 is developed in the V.RAM-A13, and necessary parts 2-7 to 2-9 in the map data 2 are stored in the other V.RAM-A13.
Expand to RAM-B14. If there is necessary data, the map data 4 is developed in the V-RAM-A13 as shown in FIG. 3C, and necessary parts 4-1 to 4-6 are copied. Once all requested map data has been completed,
The map in which the switching device 16 is developed on the V-RAM-B14, that is, the map that has been continued so far is displayed on the map display device 17.

[Problems to be solved by the invention]

However, in the above-mentioned conventional method, for example, when scrolling to the limit of the map developed on the V-RAM-A13 as described above, the development processing time to the other V-RAM-B14,
That is, it takes time to read all necessary subsequent map data from a CD-ROM or the like 18 and develop it on the V-RAM-A13, and copy only the necessary portions to the other V-RAM-B14 to create a map. Therefore, there is a problem that scrolling must be paused. In order to solve this problem, it is not a realistic solution from the viewpoint of cost and the like that a large number of V / RAMs are required to develop all maps in V / RAM in advance.

The present invention has been made in view of the above-described points, and solves the above-described problems. When developing drawing data such as a subsequent map or circuit diagram in a limited VRAM, scrolling is not temporarily stopped. It is an object of the present invention to provide a graphic display method for a display device which allows the user to see the next (adjacent) screen and efficiently expand the following data from a CD-ROM or the like to V / RAM in a short time.

[Means for solving the problem]

In order to solve the above-mentioned problem, the present invention comprises a computer and a V-RAM, expands graphic data read from an auxiliary storage device on the V-RAM, and selects a V selected by a switching device.
In a display device for displaying graphic data developed on a RAM on a display unit, a buffer memory for temporarily storing data read from an auxiliary storage device is provided, and V.RA
The capacity of M is about two figures, and when the figure display section is scrolled to a predetermined position on the V / RAM, the expansion instruction boundary recognition section reads the subsequent figure data from the auxiliary storage device, and also displays the figure. When the part is scrolled to a predetermined position, two types of development instruction boundary recognition are performed, including a development instruction boundary recognition unit that copies a necessary part of the graphic data stored in the buffer memory into the V-RAM that is not displayed. When the outside of the displayed portion of one of the displayed V-RAMs exceeds the limit of the V-RAM, the switching device switches to the other non-displayed V-RAM and is developed on the V-RAM. It is characterized by displaying figured data.

[Action]

By performing the graphic display method as described above, V · RA
Recognizes two types of expansion instruction boundaries on M, reads in advance the necessary graphic data from a CD-ROM or the like based on the direction in which the scroll moves, and efficiently expands it to V / RAM not displayed. Since the V-RAM can be switched instantaneously, scrolling can be performed beyond the size of the V-RAM, and the graphic screen can be displayed in real time without stopping the screen halfway.

〔Example〕

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

FIG. 1 is a diagram showing a configuration of a display device to which a graphic display method according to the present invention is applied. In this embodiment, a map will be described as an example of a display graphic. As shown in the figure, the display device includes a memory 11 also serving as a buffer memory, a computer 12,
A configuration including a RAM-A13, a V-RAM-B14, an operation unit 15, a switching device 16, a map display device 17, and the like.
The map data into the buffer memory 11 from the
The contents are expanded to the M-A13 and the V-RAM-B14, and the contents of the V-RAM-A13 or the V-RAM-B14 selected by the switching device 16 are displayed on the map display device 17.

FIG. 2 is a diagram for explaining a map display method using the display device having the above configuration. The map data is read from a CD-ROM or the like 18 and temporarily stored in the buffer memory 11. V
The RAM is composed of two RAMs, V-RAM-A13 and V-RAM-B14, each of which consists of nine screens (a part of several types of map data is collected and nine) as shown in the figure. One V
A RAM, for example, a map developed in V-RAM-A13 is displayed on the map display device 17, and the other V-RAM-B14 prepares a continuation map.

FIG. 3 is an explanatory diagram of a map developed on the V-RAM-A13. In this map, map data 1-4 (1-1-1-9,
2-1 to 2-9, 3-1 to 3-9, and 4-1 to 4-9) are used. In the figure,
The portion surrounded by the thick solid line La is the portion expanded to the V-RAM-A13, the portion surrounded by the broken line Lb is the map display portion in the V-RAM-A13, and the one-dot chain line Lc is surrounded by the broken line Lb. When the center of the displayed map is scrolled to this line, the CD-RO
Reads subsequent map data from M etc. 18 and buffer memory 1
The two-dot chain line Ld is a development instruction boundary for storing in the V.RAM-B14 which is not displayed when the center of the map display portion is scrolled to this line.
A necessary part of the contents is copied and is an expansion instruction boundary for expanding the map.

Although the V.RAM-B14 is developed as described above, since it is scrolled to the upper right, the map must be expanded so that the map at the upper right can be scrolled. Therefore, as shown in FIG. 2, map data 2-7 to 2-9 and 4-1 to 4-6 are developed. The V-RAM-B 14 is developed as shown in FIG. 2 so that it can be switched by the switching device 16 at any time.
When the central portion of the map display portion surrounded by the circles reaches another one-dot chain line Lc or two-dot chain line Ld, the map data that has been developed is discarded and new map data is developed by the above-described method. Then, the map developed in the V-RAM selected by the switching device 16 is displayed on the map display device 17. Hereinafter, the operation of the above configuration will be described. Now the broken line Lb in V-RAM-A13
It is assumed that the map display portion surrounded by is straddled by map data 2-7, 2-8, 4-1 and 4-2 as shown in FIG. When the center of this map display portion is scrolled to the dashed line Lc, the map data 2-7, 2-8, 4-1 and 4-2 are displayed on the display side of VR.
AM-A13 is copied to the other V-RAM-B14.
The map data 2-4 is read from the D-ROM or the like 18 into the buffer memory 11. When the center portion of the map display portion is scrolled to the two-dot chain line Ld, necessary portions of the contents of the buffer memory 11, that is, map data 2-9 and 4-3 to 4-6.
Is developed on the V-RAM-B 14 where is not displayed to create a map, and waits for a command from the switching device 16. A specific example of developing necessary map data from the buffer memory to the V-RAM-B14 will be described with reference to FIG.

First, the necessary parts, here, map data 4-3 to 4-6
The vertices are denoted by A to F, as shown in the figure. Based on the coordinates of the vertices, it is determined whether or not each set of the straight line data group of the starting point and the ending point in the buffer memory 11 is within A to F (within the hatched lines) Find out. If both straight lines are inside, the data is valid, and the data is expanded in the V-RAM-B14. If both straight lines are outside, the data is invalid. If one is a straight line inside and the other is outside, the intersection G with the BC side is obtained, and the inside point and this point G are developed as effective data in the V-RAM-B14. In the case of a straight line, the points in the diagonal lines, that is, HI, JK and LM are validated, and V.RAM-B1
Expand to 4. This operation is performed for all data in the buffer memory 11. Further, when the outside of the map display portion surrounded by the broken line Lb exceeds the limit of the V-RAM-A13 being displayed, the V-RAM-B14 in which the subsequent map data is expanded.
The display is switched by the switching device 16. Thus, the map can be scrolled and displayed over a wide area in real time. In the above-described embodiment, an example in which map data is displayed as graphic data has been described. However, the graphic data is not limited to this, and may be graphic data such as a circuit diagram.

〔The invention's effect〕

As described above, according to the present invention, 2
Recognize the type of expansion instruction boundary, read in advance the necessary graphic data from a CD-ROM or the like based on the direction in which the scroll has been moved, and efficiently expand it to V / RAM not displayed, Since the RAM can be switched instantaneously, even if the capacity of V-RAM is relatively small, it can be scrolled beyond the size of V-RAM, and the graphic screen is displayed in real time without stopping the screen halfway. The excellent effect that can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing the configuration of a display device to which the graphic display system according to the present invention is applied, FIG. 2 is a diagram for explaining a map display system using the display device having the above configuration, and FIG. RAM-A
FIG. 13 is an explanatory diagram of a map developed in FIG. 13, FIG. 4 is a diagram for explaining a specific example of expanding map data required from the buffer memory to the V-RAM-B14, and FIG. FIG. 6 is a diagram showing a schematic configuration of a display device for displaying data and circuit diagrams, etc., FIG. 6 is a diagram showing a configuration of one piece of map data, and FIG. 7 is a diagram showing a state in which map data is developed into two VRAMs. FIG. In the figure, 11 ... buffer memory, 12 ... computer, 13
... V.RAM-A, 14... V.RAM-B, 15...
16 ... Switching device, 17 ... Map display device, 18 ... CD-ROM
etc.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G09G 5/00-5/40 G06F 3/14-3/153

Claims (1)

(57) [Claims] A graphic data read from an auxiliary storage device is developed on the V-RAM, and the graphic data developed on the V-RAM selected by the switching device is displayed. In the display device for displaying the data, a buffer memory for temporarily storing data read from the auxiliary storage device is provided, and the capacity of the V-RAM is set to about two figures, and a graphic display unit is provided on the V-RAM. When scrolling to a predetermined position, the expansion instruction boundary recognition unit reads the subsequent graphic data from the auxiliary storage device. Similarly, when the graphic display unit scrolls to a predetermined position, the V.RAM is not displayed. And a development instruction boundary recognition unit for copying a required portion of the graphic data stored in the buffer memory, and two types of development instruction boundary recognition units. A display device for switching graphic data developed on the V-RAM when the outside of the display portion exceeds the limit of the V-RAM, the switching device switching to the other V-RAM that is not displayed; Figure display method.