JP2004294598A - Map display device, and program and recording medium for map display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To speed up the drawing of map data and enable smooth scroll display and zoom-in/out display. <P>SOLUTION: A map display device is equipped with a map storage means 1 of storing map data consisting of a plurality of layers, a drawing memory 6 where the map data are drawn, a display means 3 of displaying the map drawn in the drawing memory 6, an operation means 4 for making an operation indication of a map to be displayed, a display level setting means 7 of allocating and setting one of a plurality of display levels corresponding to the respective layers of the map data, and a drawing processing means 5 of reading the map data out of the map storage means 1 according to a display level and drawing them in the drawing memory 6. According to the operation indication, map data of the layer of the top display level set in the display level setting means 7 are drawn in the drawing memory 6 according to the operation indication and then the map data of the respective layers are drawn one after another in the drawing memory 6 on condition that there is not an operation indication from the 2nd high display level. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a map display device that controls the display of a map according to an operation instruction, a program for the map display device, and a recording medium.
[0002]
[Prior art]
FIG. 7 is a schematic block diagram of the map display system. The map display system includes a map database 1 storing map data as shown in FIG. 7, an image processing unit 2 for performing image processing of the map data, a display unit 3 for displaying the map data as a map image, And an operation unit 4 for inputting the instruction of Such a map display system is realized by, for example, a personal computer including a computer main body as the image processing unit 2, a keyboard and mouse as the operation unit 4, and a monitor as the display unit 3.
[0003]
The computer main body includes a CPU, a storage unit, a memory (RAM), a drawing memory (VRAM), and the like. The storage unit is a storage device called a hard disk, and corresponds to the map database 1 and stores map data and a computer program for executing display control of the map data. For example, an optical disk such as a CD-ROM May be provided as a recording medium such as a magnetic disk or a magneto-optical disk. Then, the CPU executes the display control of the map data according to the computer program. In this case, the memory is an area in which the map data read from the storage unit is temporarily stored, and the CPU can access the memory faster than the storage unit. Further, the drawing memory is an area in which an image for one screen of the monitor is stored.
[0004]
In the map display system as described above, when the map is scroll-displayed, if the entire drawing memory is rewritten each time in accordance with the scroll instruction, the processing amount increases, it takes time, and the smooth scroll display cannot be performed. . Therefore, at the time of scroll display, map data consisting of multiple layer data, for example, national roads and administrative boundaries / administrative boundaries names, rivers and coastlines, railways and the like as upper layer data, the other is divided into lower layer data, By drawing only upper layer data in a drawing memory (for example, refer to Patent Document 1) or by copying overlapping rectangular areas (for example, refer to Patent Document 2), map data to be scroll-displayed is drawn in a drawing memory. And smooth scroll display.
[0005]
[Patent Document 1]
JP 2000-181344 A
[Patent Document 2]
Japanese Patent Application Laid-Open No. 9-231045
[Problems to be solved by the invention]
However, in the map scrolling display in the above-described conventional map display system, in the case of a method of drawing map data limited to upper layer data such as national roads, administrative boundaries / administrative boundaries, rivers / coastlines, railways, etc. in a rendering memory, a user's Depending on the application or the display scale, the map information required for the scroll display cannot be obtained, and the scroll display may need to be stopped and the lower layer data must be displayed and viewed. Also, in the case of a method of copying overlapping rectangular areas, the amount of map data in an area outside the copied rectangular area also increases, depending on the size of the overlapping rectangular areas and the contents of the map to be displayed, and drawing to the drawing memory. Cannot be speeded up.
[0008]
[Means for Solving the Problems]
The present invention solves the above-described problems, and can set a layer to be preferentially displayed flexibly according to a user's request or a scale, thereby speeding up drawing of map data, smooth scroll display, zoom-in / out display. Is to be able to
[0009]
For this purpose, the present invention is a map display device that controls the display of a map in accordance with an operation instruction, wherein the map storage means stores map data composed of a plurality of layers, and the map data stored in the map storage means is drawn. A drawing memory, display means for displaying a map drawn on the drawing memory, operation means for instructing operation of the map to be displayed on the display means, and a plurality of display levels corresponding to each layer of the map data. A display level setting means to which is assigned and set; and drawing processing means for reading map data stored in the map storage means based on the display level set in the display level setting means and drawing the map data in a drawing memory, The drawing processing means includes a layer having the highest display level set in the display level setting means based on an operation instruction from the operation means. After drawing the map data in the drawing memory is from the next higher the display level which is characterized in that for drawing in sequence the drawing memory map data in each layer on the condition that there is no said operation instruction.
[0010]
When the operation by the operation unit is a scroll operation, the drawing processing unit determines the scroll operation amount and controls a scroll speed and a magnification of the map data. Wherein the display level setting means assigns and sets one of the plurality of display levels for each scale corresponding to each of the layers. It is characterized by the following.
[0011]
A map display device program that controls the display of a map according to an operation instruction includes a display level table in which map data including a plurality of layers and any one of a plurality of display levels corresponding to each layer of the map data are assigned and set. The map data of the layer having the highest display level is drawn in the drawing memory based on the operation instruction of the map to be made, and then the map data of each layer is provided on condition that there is no operation instruction from the next higher display level. The storage medium for a map display device, which sequentially performs a process of drawing in the drawing memory and controls display of a map in accordance with an operation instruction, includes the program, map data including a plurality of layers, and the map data. And a display level table to which any one of a plurality of display levels is assigned and set. The one in which the features.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a map display device according to the present invention, and FIG. 2 is a diagram showing a configuration example of a display level table. In the figure, 1 is a map database, 2 is an image processing unit, 3 is a display unit, 4 is an operation unit, 5 is a drawing processing unit, 6 is a drawing memory, 7 is a display level table, and 8 is an input processing unit.
[0013]
In FIG. 1, a map database 1 is a hard disk that stores spatial data and stores map data divided into meshes within a predetermined range, and is a recording medium such as an optical disk such as a CD-ROM, a magnetic disk, or a magneto-optical disk. It is. The display unit 3 is a display that displays a map drawn in the drawing memory 6 based on the map data and the space data stored in the map database 1. A mouse, a pointing device such as a joystick, and a keyboard for inputting data for operating instructions such as scrolling, switching of scale, zooming in / out, and the like. The image processing unit 2 reads out map data and spatial data stored in the map database 1 based on an operation instruction from the operation unit 4 and performs processing for displaying a map drawn in the drawing memory 6 on the display unit 3. And a drawing processing unit 5, a drawing memory 6, a display level table 7, an input processing unit 8, and the like.
[0014]
The display level table 7 in the image processing unit 2 is a display level setting unit to which one of a plurality of display levels corresponding to each layer of the map data is assigned and set. For example, as shown in FIG. Each layer is assigned and set in accordance with the scale. The input processing unit 8 performs a process of scrolling a map displayed on the display unit 3 from the operation unit 4, switching a scale, inputting operation instructions such as zooming in / zooming out, setting a display level table, and the like. . The drawing processing unit 5 reads out map data and spatial data stored in the map database 1 for each mesh and each layer based on an operation instruction from the operation unit 4 input through the input processing unit 8 and the display level table 7. And draws a map in the drawing memory 6. After drawing the map data of the layer having the highest display level in the drawing memory 6, the map of each layer is provided on condition that there is no operation instruction from the next higher display level. The data is sequentially drawn in the drawing memory.
[0015]
Therefore, in the image processing unit 2, when there is an operation instruction such as scrolling of a map, switching of a scale, zoom-in / zoom-out, etc., the drawing processing unit 5 first executes the display level table shown in FIG. 7, the map data of the layer set at the display level 1 according to the scale (1/1000, 1/2500,...) Is read from the map database 1 and drawn in the drawing memory 6 to display the display unit. The map is displayed on 3. Thereafter, if there is still an operation instruction, the same map data is read, drawn, and displayed in accordance with the operation instruction. If there is no operation instruction, the map data of each layer is read and drawn from the next higher display level 2. , Display, and successively, reading, drawing, and display of map data of each layer of display levels 3,...
[0016]
The map data stored in the map database 1 is composed of a plurality of layer data having different data types, and each layer data includes national road data, general road data, railway data, administrative / administrative name data, river / coastline data, Symbol data, name / character string data, etc. Here, the national road data is data having information on national roads on a map. The general road data is data having information on roads other than national roads, for example, roads such as prefectural roads and city roads. The railway data is data having information on railway lines such as JR and other private railways, stations, and the like. The administrative boundary / administrative boundary name data is data having information on the administrative boundary and its name. River / coastline data is data having information such as the shape of rivers and coastlines. The symbol data is data having information of a symbol (mark) indicating a position of a building or a field on a map. The name / character string data is data having character information such as a name of each information of each layer data. The spatial data is point data, line data, polygon data, and the like, and includes various information corresponding to points and areas on a map including user data such as demographic data and customer data.
[0017]
The map image displayed on the display unit 3 is a superposition of images obtained by drawing the respective layer data in the drawing memory 6 by the drawing processing unit 5. A set of each layer data is stored in the map database 1 as one map data for each mesh unit. Then, when reading of map data of a new mesh range is performed by the occurrence of scroll, scale switching, and zoom-in / zoom-out events based on an operation instruction from the operation unit 4, layer data corresponding to the new mesh range is displayed. It is read and rendered.
[0018]
Next, an example of a specific display process and an example of a display level table will be described. 3 is a diagram for explaining an example of a display process in response to an operation instruction for scroll display, FIG. 4 is a diagram showing a setting example of a display level table, FIG. 5 is a diagram showing another setting example of a display level table, and FIG. FIG. 9 is a diagram for explaining another example of the display process in response to the operation instruction of the scroll display.
[0019]
In the scroll display processing when the map is displayed on the screen of the display unit, for example, as shown in FIG. 3, the occurrence of the movement event is monitored (step S11), and the operation unit issues an operation instruction for the scroll display, and the movement event is generated. Is recognized, the moving direction and the moving distance are acquired (step S12), and the display level counter i is set to 1 (step S13).
[0020]
Next, the display level of the counter i, that is, the layer data of the display level 1 is obtained from the map database (step S14), the obtained layer data is drawn in the drawing memory (step S15), and the counter i is incremented by " i + 1 "(step S16). Then, it is determined whether or not the value of the counter has exceeded the value N of the maximum drawing level (step S17). If the value of the counter is still not more than N, it is further determined whether or not the same type of event has occurred. Then, if the same type of event has not occurred (NO in step S18), the process returns to step S14. If the same type of event has occurred, the process returns to step S12 and repeats the same processing. The above processing is repeated until the value of the counter exceeds N.
[0021]
When the display level table is set to display levels 1 to 4 as shown in FIG. 4, for example, if there is an operation instruction for scroll display from the operation unit by the above processing, until the operation instruction disappears during that time. , Prefectural boundaries, prefectural names, major lakes, municipalities, municipalities, municipal names, major water stations, major railway stations, major railway lines, major railway names, major roads, The map data of each layer of the general road name is read, drawn in the drawing memory, and displayed on the screen of the display unit, so that the scroll display is sequentially performed. Then, when there is no operation instruction, the display level 1 is followed by the display level 2 of the town / large character field, the town / large character name, the chome / character (large character) field, the chome / character (large character) field name,. Reading, drawing, and display of map data of each layer are performed, and reading, drawing, and display of map data of each layer of display levels 3 and 4 are sequentially performed.
[0022]
As described above, in the present embodiment, when a scroll event or a zoom event occurs, instead of displaying all the layers at once, the layer of the display level 1 is displayed first, and subsequently, the same type of event occurs. If so, the display of the remaining layers is omitted, and the display level 1 layer is displayed again in the new area. If the same type of event has not occurred, a layer of display level 2 is displayed, so that a maximum of four levels of layer control are performed. This allows the user to scroll or zoom in / out at a desired speed without stress. The displayed layer will be detailed according to the speed. If scroll events occur continuously, high-speed scrolling becomes possible.
[0023]
FIG. 5 shows an example of a display level table in which the display level is set according to the scale of the map by further developing these mechanisms. In general, on a small-scale wide area map, the prefectural boundaries, Shinkansen and expressways, coastlines and rivers are important layers, but on a large-scale detailed map, especially a residential map, Chome Sakai and its name, intersection name, target Things become an important layer. Focusing on these differences, a layer is set for each display level according to the size of the scale. This enables precise smooth scrolling corresponding to the scale. Further, there is a layer that is meaningless to be displayed depending on the scale level. For example, it is possible to omit the display of unnecessary layers such as small-scale building information or the like to increase the speed. In FIG. 5, unnecessary display layers are represented by [-]. FIG. 6 shows an example of a scroll display process executed by applying such a display level table.
[0024]
In the scroll display process shown in FIG. 6, in the scroll display process described with reference to FIG. 3, the process up to the determination process of the occurrence of the same type of event in step S18 is the same, but when the same type of event has occurred, the event determination is further performed. The process is performed (step S19), and it is determined whether or not to change the drawing condition (step S20). The drawing condition is changed (step S21), and the process returns to step S12. Here, as the event determination processing, for example, in the case of a scroll display operation instruction using a joystick, when the player continuously depresses for a predetermined time or more, in the case of a scroll display operation instruction using a ball such as a mouse, the operation amount is large. In such a case, the moving amount is increased, that is, the scroll speed is increased from a low speed to a middle speed and a high speed. When the scroll speed is changed, the scale of the map may be changed accordingly, that is, a detailed map may be changed to a wide area map, or a wide area map may be changed to a detailed map. By doing so, on the screen, the change in the moving speed can be reduced or the change in the moving speed can be eliminated, and by intermittently repeating the operation, the scroll display at the intermediate display level is realized You can also.
[0025]
When scrolling the screen or zooming in / out at the request of the user, for example, when scrolling is repeated at a high speed, only the layer most important to the user is displayed without displaying all the layers, and the current position and the magnification are changed. It needs to be displayed quickly. According to the above-described embodiment, the user can quickly obtain his / her desired position and magnification. Or, even if it is not high speed, if it is a scroll request or zoom request at medium speed, only the most important layer and some important layers are displayed, and more detailed map data and spatial data are obtained compared to high speed Is also possible. Similarly, if a low-speed scroll request is made, all layers can be displayed. With these mechanisms, it is possible to update the screen at a speed desired by the user without having to wait for the completion of all layer processing for scrolling or zoom display.
[0026]
Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the display levels are indicated by display levels 1, 2,..., But there may be a layer that is not set to this display level, and in that case, the layer that is not set is finally set as the lowest display level. Even when drawing is performed, a layer having a display level at which drawing is not performed may be set so as not to be drawn.
[0027]
【The invention's effect】
As is apparent from the above description, according to the present invention, a map storage means for storing map data comprising a plurality of layers, a drawing memory for drawing map data stored in the map storage means, and a drawing memory for drawing data Display means for displaying the displayed map, operation means for instructing the operation of the map to be displayed on the display means, and display level setting means for assigning and setting one of a plurality of display levels corresponding to each layer of the map data. Drawing processing means for reading map data stored in the map storage means based on the display level set in the display level setting means and drawing the map data in a drawing memory, wherein the drawing processing means displays the image data based on an operation instruction from the operation means. After drawing the map data of the layer having the highest display level set in the level setting means in the drawing memory, no operation instruction is given from the next highest display level. Since the map data of each layer is sequentially drawn on the drawing memory on the condition that the conditions are satisfied, the display level setting means can flexibly set the layer to be preferentially displayed according to the user's request and the scale, thereby speeding up drawing of the map data. , Smooth scroll display, zoom-in / out display. Therefore, even if the data amount is large, high-speed and smooth display can be achieved by drawing processing of only necessary information.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a map display device according to the present invention.
FIG. 2 is a diagram illustrating a configuration example of a display level table.
FIG. 3 is a diagram for describing an example of a display process in response to an operation instruction for scroll display.
FIG. 4 is a diagram showing a setting example of a display level table.
FIG. 5 is a diagram showing another setting example of the display level table.
FIG. 6 is a diagram for explaining another example of a display process in response to an operation instruction for scroll display.
FIG. 7 is a schematic block diagram of a map display system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Map database, 2 ... Image processing part, 3 ... Display part, 4 ... Operation part, 5 ... Drawing processing part, 6 ... Drawing memory, 7 ... Display level table, 8 ... Input processing part

Claims (7)

A map display device that controls display of a map according to an operation instruction,
Map storage means for storing map data comprising a plurality of layers;
A drawing memory for drawing map data stored in the map storage means;
Display means for displaying a map drawn in the drawing memory;
Operating means for instructing the operation of the map to be displayed on the display means;
A display level setting unit to which one of a plurality of display levels corresponding to each layer of the map data is assigned and set;
Drawing processing means for reading map data stored in the map storage means based on the display level set in the display level setting means and drawing the map data in a drawing memory, wherein the drawing processing means performs an operation instruction by the operation means. After the map data of the layer having the highest display level set in the display level setting means is drawn in the drawing memory, the map of each layer is provided on condition that there is no operation instruction from the next highest display level. A map display device which sequentially draws data in the drawing memory. 2. The map display device according to claim 1, wherein, when the operation by the operation unit is a scroll operation, the drawing processing unit determines a scroll operation amount and controls a scroll speed. 3. The map display device according to claim 1, wherein, when the operation by the operation unit is a scroll operation, the drawing processing unit determines a scroll operation amount and controls a magnification of the map data. 4. The map display device according to any one of claims 1 to 3, wherein the map data includes spatial data including various information corresponding to points and areas on a map. 5. The map display device according to claim 1, wherein the display level setting unit assigns and sets one of the plurality of display levels for each scale corresponding to each of the layers. 6. A program for a map display device that controls display of a map according to an operation instruction,
Based on map data consisting of a plurality of layers and a display level table to which any one of a plurality of display levels corresponding to each layer of the map data is assigned and an operation instruction of a map to be displayed, Draw the map data in the drawing memory,
A program for a map display device, which then performs a process of sequentially drawing map data of each layer in the drawing memory on condition that there is no operation instruction from the next higher display level. A recording medium for a map display device that controls display of a map according to an operation instruction,
Map data consisting of multiple layers,
A display level table to which one of a plurality of display levels corresponding to each layer of the map data is assigned and set;
A recording medium for a map display device, which records the program for a map display device according to claim 5.

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