JPH1195974A - Reduced scale graphic preparing and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a graphic of reduced scale easy to watch, and to speedily display graphic data of reduced scale. SOLUTION: This display device is provided with an input data acquiring means 2 for fetching a display request area and reduction scale from the outside, graphic file group 3 for storing the graphic data of a map or the like in advance, thinned graphic setting means 5 for setting graphic class data for every prescribed reduction scale in advance, layer memory 4 for storing the coordinate data of respective graphic classes, 1st thinning processing means 6 for extracting the coordinate data of a graphic class from the layer memory based on the graphic class data to be extracted from the graphic setting means corresponding to the reduction scale and thinning the graphic data of the coordinate of the graphic class from the graphic data of the graphic file group, and 2nd thinning processing means 8 for preserving the graphic data of reduced scale to be plotted in a graphic data base by thinning the dots of the graphic data of the map or the like provided after this thinning processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-scale figure creating and displaying apparatus for displaying a figure such as a map at a small scale.

[0002]

2. Description of the Related Art Graphic types (roads,
When storing vector map data accompanied by telephone poles, buildings, etc., for example, as shown in FIG. 9, for example, n × m graphic file groups are used.
In the case of displaying by 00 times, 10,000 mn figure file groups are required in advance, and vector map data is stored across these 10,000 mn figure file groups.

After the vector map data is written in the graphic file group as described above, when the operator designates and inputs the display request area and the required contraction scale, the graphic request group in the graphic file group which already stores the vector map data is displayed. All the vector map data files existing in
That is, the scale is uniformly reduced according to the required reduction scale regardless of the graphic type in the file group existing in the display request area, for example, road, telephone pole, and the like, and is displayed on the display unit via the image memory. In the figure, 1 is a road, 2 is a building, 3
Means a display unit.

[0004]

Therefore, especially in a small-scale graphic generating and displaying apparatus, graphic data such as a vector map is uniformly reduced in accordance with a required reduced scale. Problems are pointed out. (1) Since all of the vector map data used in the ordinary business is displayed in a reduced scale at a small scale, graphic data of many graphic types existing in the vector map data is also drawn on the display unit. There is a problem that it becomes crowded and very difficult to see, and it takes a considerable time to display vector map data. (2) When a vector map is displayed at a small scale, depending on the reduction ratio of the map, for example, in the case of a hexagonal figure in FIG. In the case of the rectangular figure of b), four points overlap at the same coordinates, and graphic data of different figure types, for example, road lines, telephone pole lines, and building data such as building walls overlap at the same coordinates. Road lines, telephone pole lines, building walls, etc. are drawn multiple times in the same dot area on the display screen of the unit, resulting in a very wasteful time in drawing, and a vector map in the display request area. There is a problem that it takes a considerable time to display. (3) Also, when the vector map data is displayed at a small scale, what appears to be a single figure to the eye is actually composed of a collection of many figures. In this case, the amount of data for graphic display increases, and in this regard, display takes time. (4) In the case of normal vector map data, each element of the graphic data constituting the map is arranged in the shape of the base,
When such graphic data is reduced to a small scale, a large number of files are accessed to display a huge number of elements of each graphic data of the graphic file group, and it takes a lot of time to access the files.

As described above, when the vector map data is reduced at a small scale, the amount of data access increases, it takes a long time to display, the figure becomes very difficult to see, and the vector map data cannot be displayed in a visually optimal state. There is a defect.

[0006] The invention described in claims 1 and 4 is
In view of the above-described circumstances, a small-scale figure creating and displaying apparatus that creates a small-scale figure by selectively thinning and reducing graphic data of a figure type according to a required reduced scale, and enables quick display. Is to provide.

According to a second aspect of the present invention, there is provided a small-scale graphic creating and displaying apparatus capable of preventing data of a plurality of graphic portions from overlapping with the same coordinates after being reduced by the small scale and enabling quick display. It is to provide a device.

[0008] The invention described in claims 5 and 6 provides a small-scale figure creating / displaying apparatus capable of simplifying a figure by shape approximation, reducing the amount of figure data, and enabling quick display after reduction by the small scale. Is to do.

[0009]

According to a first aspect of the present invention, there is provided a graphic file group in which graphic data such as a map is stored in advance, and a graphic file group in which a graphic data group such as a map is stored in advance. Thinned-out graphic setting means in which thinned-out graphic type data is set, data storage means in which coordinate data of each graphic type is stored, and thinned-out data taken out from the thinned-out graphic setting means in accordance with a request reduction scale inputted from outside First thinning processing means for extracting coordinate data of the graphic type from the data storage means based on the graphic type data for use, and thinning out graphic data corresponding to the coordinate data of the graphic type from the graphic data of the graphic file group; A second thinning-out processing means for thinning out dots of graphic data such as a map obtained after the thinning-out processing by the first thinning-out processing means to create a small-scale figure; Door is a small scale graphics creation and display device provided with.

[0010] By adopting such means, the graphic data corresponding to the coordinate data of the unnecessary graphic type is thinned out on the display in accordance with the required reduced scale, and further reduced in accordance with the required reduced scale. Even if the image is reduced, a large number of display figures are not crowded and are easy to see, and unnecessary figure data of a figure type is thinned out, so that required figure data can be quickly displayed.

Next, a second aspect of the present invention provides a graphic file group in which graphic data such as a map is stored in advance.
Thinning-out processing means for thinning out the dots of the graphic data stored in the graphic file group according to the required contraction scale inputted from the outside; and the same coordinates as the coordinates once drawn at the time of drawing after the thinning-out processing by the thinning-out processing means A coordinate checking means for discarding the graphic data of the coordinates or drawing only the graphic data of the graphic type having one color attribute according to the priority determined according to the color attribute of each graphic type is provided. This is a small-scale figure creation display device.

By taking such means, it is possible to discard the graphic data having the same coordinates as the coordinates once drawn at the time of drawing after the thinning processing, or to perform the processing in a case where color-coded display can be performed in advance according to the figure type. If the display priority is set for the color classification, when the coordinates of the graphic data of different graphic types overlap, the graphic data of the graphic type having one color attribute is drawn according to the priority. Overlap can be avoided, and when displaying on the display unit, the waste of drawing a plurality of times can be reduced, and the waste of display time can be reduced.

Further, the invention corresponding to claims 5 and 6 is:
A graphic file group in which graphic data such as a map is stored in advance, thinning processing means for thinning out dots of graphic data stored in the graphic file group in accordance with a required reduction scale input from the outside, This is a small-scale figure creation and display device provided with shape approximation processing means for creating a small-scale figure by thinning each figure data after the thinning processing by a shape approximation processing.

The shape approximation processing means performs a distance approximation process for thinning out points within a predetermined distance from each point of the polygonal line constituting each figure data, and extends from each point of each polygonal line constituting each figure data. When the angle between the two sides is within a predetermined angle, one or both of the angle approximation processing and the angle approximation processing for performing the thinning processing are executed. By taking such means, complicated graphic data is simplified by the shape approximation process, and the amount of graphic data is reduced, so that the graphic data can be displayed quickly.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a functional block diagram for explaining an embodiment of a small-scale figure creating and displaying apparatus according to the present invention.

This small-scale figure creating and displaying apparatus is a processing data storage means 1 for storing figure data such as a map in the course of processing.
And input data acquisition means 2 for receiving display request area data and reduced scale data input from a keyboard or other input device and storing the data in a predetermined storage area of the processing data storage means 1; A graphic file group 3 which is composed of a plurality of files based on the plurality of graphic files and stores graphic data such as a vector map over the plurality of graphic files, and each graphic type constituting the vector map or the like, for example, road, river, A layer memory 4 that is divided into layers for each building and has coordinate data of these roads, rivers, and buildings, and a thinned figure setting unit 5 in which thinned figure data of a graphic type for each predetermined reduction scale is set in advance. Have been.

Further, the display device fetches the display request area data and the reduced scale data from the processing data storage means 1, and sets the figure type corresponding to the reduced scale by the thinned figure setting means 5 and the figure defined in the layer memory 4. A first thinning-out processing means 6 for removing unnecessary graphic data of the graphic type from the coordinates of the graphic data of the type and storing the same in the processing data storage means 1; Graphic data such as a map stored in the layer memory 4 according to the required reduction scale.
Second thinning processing means 8 for storing graphic data such as a map to be drawn on the graphic database 7 based on the coordinate data of
When requested from the outside on the small scale, the graphic data of the required reduced scale stored in the graphic database 7 is displayed on the display unit 9.
And a display control means 10 for displaying the information.

Next, the operation of the small-scale figure creating and displaying apparatus configured as described above will be described. Graphic data such as a vector map is stored in advance in a large number of graphic file groups 3 that can be reduced in scale. In this state, when the operator inputs the display request area data and the required reduced scale data from an input device such as a keyboard, the input data acquiring means 2 fetches the display request area data and the reduced scale data and stores them in the processing data storage means 1. Remember.

Thereafter, in the first thinning processing means 6,
After the display request area data and the reduced scale data stored in the processing data storage unit 1 are read out, they are set in the thinned figure setting unit 5 according to the reduced scale data from the viewpoint of avoiding congestion of unnecessary graphic data. The graphic data of the graphic type corresponding to the reduced scale data is extracted, and the graphic data of the graphic type extracted from the graphic data such as the map of the graphic file group 3 is thinned out in accordance with the data specified in the data storage means 4. It is stored in the storage means 1.

Further, in the second thinning processing means 8, graphic data of a map or the like after thinning the graphic data of the extracted graphic type stored in the processing data storage means 1 according to the required reduction scale. After the image data is reduced and the graphic data such as a map to be drawn based on the coordinate data in the layer memory 4 is stored in the graphic database 7, it is displayed on the display unit 9 by the display control means 10.

Therefore, according to the above-described embodiment, unnecessary graphic data of a graphic type is deleted when the image data is reduced according to the reduction scale. The graphic data can be displayed very easily without being crowded. Also, if the above-described thinning processing is performed and stored in the graphic database 7 in advance, the graphic data can be read and displayed when necessary, and the graphic data of the unnecessary graphic type can be quickly displayed without accessing the graphic data. (Second Embodiment) FIG. 2 is a functional block diagram for explaining another embodiment of a small-scale figure creating and displaying apparatus according to the present invention.

This small-scale figure creating and displaying apparatus is a processing data storage means 1 for storing figure data such as a map in the course of processing.
And input data acquisition means 2 for receiving display request area data and reduced scale data input from a keyboard or other input device and storing the data in a predetermined storage area of the processing data storage means 1; A graphic file group 3 which is composed of a plurality of files based on the plurality of graphic files and stores graphic data such as a vector map over the plurality of graphic files, and each graphic type constituting the vector map or the like, for example, road, river, A layer memory 4 that is divided into layers for each building and has coordinate data of these roads, rivers, and buildings;
And a thinning-out processing means 11 for reducing graphic data such as a vector map stored in the storage device.

Further, in this display device, after the thinning-out processing by the thinning-out processing means 11, a plurality of points of the graphic data overlap with the same coordinate, or a road and a building, which are graphic data of a plurality of different graphic types, overlap with the same coordinate. In order to avoid drawing processing on the display unit 9 a plurality of times, the coordinates of the figure data after the thinning processing are checked, and the coordinates of the same coordinates as the coordinates of the figure data once drawn in the figure database 7 are checked. Coordinate checking means 12 for discarding and thinning out the graphic data, and display control means 10 for displaying graphic data of the required reduced scale stored in the graphic database 7 on the display unit 9 when externally requested on a small scale. Have been.

The operation of the apparatus configured as described above will be described. Graphic data such as a vector map is stored in advance in a large number of graphic file groups 3 that can be reduced in scale. In this state, when the operator inputs the display request area data and the required reduced scale data from an input device such as a keyboard, the input data acquiring means 2 fetches the display request area data and the reduced scale data and stores them in the processing data storage means 1. Remember.

Thereafter, the thinning-out processing means 11 reads out the display request area data and the reduced scale data stored in the processing data storage means 1 and then displays the graphics such as a map of the graphic file group 3 existing in the display request area. The data is reduced in accordance with the reduced scale data and stored in the processing data storage unit 1.

After the reduced graphic data such as a map is stored in the processing data storage means 1 in this way, the coordinate check means 12 should draw the coordinate data of the graphic type specified in the layer memory 4. Graphic data such as a map is created and stored in the graphic database 7. However, since the graphic data is reduced to a small scale at this time, for example, the figure after the thinning processing is performed in order to avoid drawing the road and the building at the same coordinates. The coordinates of the data are checked, the graphic data having the same coordinates as the coordinates once written in the graphic database 7 are discarded, and the graphic data is stored in the graphic database 7 with the graphic data amount reduced.

Therefore, if there is a display request based on the same reduced scale thereafter, graphic data having a small graphic data amount can be read from the graphic database 7 and displayed on the display unit 9, and graphic data such as a map can be displayed quickly. In addition, a plurality of drawing processes are performed by overlapping graphic data of a plurality of graphic types on the same coordinate as in the related art. However, for example, when rectangular graphic data overlaps one coordinate as shown in FIG. ,
It is only necessary to draw one dot in the figure database 7, and two buildings can be drawn with two dots as shown in FIG. 3B, and the required figure such as a vector map can be quickly displayed. it can.

Although the apparatus shown in FIG. 2 is provided with the thinning processing means 11 for reducing the size in accordance with the required reduction scale, for example, instead of the thinning processing means 11, the first thinning processing means 6 as shown in FIG. Alternatively, the second thinning processing means 8 may be used. In this case, it goes without saying that the thinned figure setting means 5 is also added.

When discarding the graphic data having the same coordinates as the once written coordinates, as shown in FIG. 4, the layer priority setting means 21 and the layer priority specified by the layer priority setting means 21 are used. May be provided with coordinate checking means 22 for discarding graphic data of a graphic type having an attribute of another color based on.

Generally, in the layer memory 4, the coordinates of the figures of each figure type and the color data of the figures of the figure type are defined. Set. In this state, graphic data such as a map of the graphic file group 3 is reduced by the thinning processing means 11 in accordance with the reduced scale data and stored in the processing data storage means 1. The figure data such as a map to be drawn is created along with the coordinate data of the figure type to be drawn and stored in the figure database 7. In order to avoid drawing, the coordinates of the figure data after the thinning process are checked, and the layer priority setting unit 21 determines that the drawing priority on the road is higher between the drawing on the road and the drawing on the building. The image data is stored in the graphic database 7 while drawing is excluded.

Therefore, graphic data having a small graphic data amount can be read out from the graphic database 7 and displayed on the display unit 9, and graphic data such as a map can be quickly displayed. Although the apparatus shown in FIG. 4 is provided with the thinning-out processing means 11 for reducing the size in accordance with the required reduction scale, for example, the first thinning-out processing means 6 and the second thinning-out means as shown in FIG. The thinning processing means 8 may be used. In this case,
It goes without saying that the thinned figure setting means 5 is also added. (Third Embodiment) FIG. 5 is a functional block diagram for explaining another embodiment of a small-scale figure creating and displaying apparatus according to the present invention.

This display device has a processing data storage unit 1, an input data acquisition unit 2, a graphic file group 3, a layer memory 4, a thinning processing unit 11, etc. having the same functions as in FIG. Each figure data such as a map after the thinning processing is subjected to a shape approximation process based on the shape approximation instruction data, and the processed figure data is displayed on the display unit 9 via the display control means 10 and thereafter, The configuration is such that a shape approximation processing means 31 for storing the graphic in the graphic database 7 for graphic display is provided.

The shape approximation process of the shape approximation processing means 31 includes a shape approximation process by thinning out distances and a shape approximation process by thinning out angles, and one or both of them are used. is there.

Next, the operation of the small-scale figure creating and displaying apparatus configured as described above will be described with reference to FIGS. In advance, graphic data such as a vector map is stored across a large number of graphic file groups 3 that can be reduced in scale. In this state, when the operator inputs the display request area data and the required reduced scale data from an input device such as a keyboard, the input data acquiring means 2 fetches the display request area data and the reduced scale data and stores them in the processing data storage means 1. Remember.

Here, the thinning-out processing means 11 reads out the display request area data and the reduced scale data stored in the processing data storage means 1 and then reads the figure such as a map of the figure file group 3 existing in the display request area. The data is reduced in accordance with the reduced scale data and stored in the processing data storage unit 1.

After storing the reduced graphic data such as a map in the processing data storage means 1, the shape approximation processing means 31 executes the shape approximation processing based on the approximation processing instruction data. As shown in FIG. 6, the shape approximation processing means 31 determines whether or not shape approximation instruction data has been input. If there is shape approximation instruction data in the processing data storage means 1, it is determined that there is a shape approximation processing request (ST1), and a thinning process by distance is performed for a specified distance from the required i point (ST2). For example, as shown in FIG. 7, when the figure data after the thinning processing by the thinning processing means 11 is a polygonal figure as shown on the left side of FIG. 7, as shown in FIG. An approximation process of deleting all points within a distance l from each point is executed. As a result, as shown on the right side of FIG.
Points are deleted, the amount of graphic data can be reduced, and the shape can be sufficiently approximated.

Subsequently, a thinning process based on the angle θ is performed (ST3). In the thinning process using the angle θ, when a polygonal figure as shown on the left side of FIG. 8 is formed, the angle of each polygonal line portion and the preset angle (180 ° ± α)
When the angle of the polygonal line portion is within (180 ° ± α), the approximation processing is executed by deleting the angle and connecting the straight line line. As a result, as shown on the right side of the figure, the polygonal line connecting the point k is deleted, and the points (k-1) and (k + 1) are connected, so that the amount of graphic data can be reduced and the shape can be sufficiently approximated. Can be done.

Therefore, according to the embodiment having the above-described configuration, graphic data such as a map is reduced in accordance with the reduced scale data, and each point of the shape of each graphic data constituting the reduced map is reduced. When the distance from the object and the angle between the two sides extending from each point are within a predetermined value, each point is deleted and the shape of the figure is simplified, so that the amount of figure data is significantly reduced. Graphic data such as maps can be read and displayed quickly.

[0039]

As described above, according to the present invention, the following effects can be obtained. According to the first and fourth aspects of the present invention, the graphic data of the graphic type is selectively thinned and reduced in accordance with the required reduction scale, so that congestion of the graphic data between the graphic types can be avoided, and the small scale graphic can be easily viewed. It can be created and graphic data of the required reduced scale can be displayed quickly.

According to the second to fourth aspects of the present invention, it is possible to avoid overlapping of figures having the same coordinates, to reduce the amount of figure data, and to quickly display figure data such as a map. According to the fifth and sixth aspects of the present invention, graphic data such as a map can be simplified by the shape approximation process, and the amount of graphic data can be reduced, so that graphic data such as a map can be displayed quickly.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing one embodiment of the invention according to claim 1;

FIG. 2 is a functional block diagram showing one embodiment of the invention according to claim 2;

FIG. 3 is a view showing a processing result by the apparatus of FIG. 2;

FIG. 4 is a functional block diagram showing one embodiment of the invention according to claim 3;

FIG. 5 is a functional block diagram showing one embodiment of the invention according to claim 4;

FIG. 6 is a flowchart for explaining the operation of the apparatus shown in FIG. 5;

FIG. 7 is a view for explaining an example of a shape approximation process by thinning distances.

FIG. 8 is a view for explaining an example of a shape approximation process by thinning angles.

FIG. 9 is a view for explaining an increase in the number of files when a conventional graphic data such as a map is reduced to a small scale.

FIG. 10 is a view for explaining that a plurality of graphic coordinates overlap with the same coordinates when reduced to a small scale.

[Explanation of symbols]

 3 ... figure file group. 6 First thinning-out processing means. 7... Second thinning processing means. 11 thinning-out processing means 12, 22 ... Coordinate checking means. 21 ... layer priority setting means. 31 ... shape approximation processing means

Claims (6)

[Claims] 1. A figure file group in which figure data such as a map is stored in advance, thinned figure setting means in which thinned figure type data is set in advance for each predetermined scale, and coordinate data of each figure type are Data storage means for storing, and coordinate data of a graphic type are taken out from the data storage means based on the thinned-out graphic type data taken out from the thinned-out graphic setting means in accordance with a request reduction scale inputted from outside, and the graphic file is obtained. A first method of thinning out graphic data corresponding to the coordinate data of the graphic type from the graphic data of the group;
Thinning-out processing means, and second thinning-out processing means for thinning out dots of graphic data such as a map obtained after the thinning-out processing by the first thinning-out processing means to create a small-scale figure. To create and display small scale figures. 2. A thinning-out method for thinning out a graphic file group in which graphic data such as a map is stored in advance, and dots of graphic data stored across the graphic file group in accordance with a required reduction scale inputted from the outside. Processing means; and coordinate checking means for discarding graphic data having the same coordinates as the coordinates once drawn at the time of drawing after the thinning processing by the thinning processing means and creating a small scale graphic. Small scale figure creation display device. 3. A figure file group in which figure data such as a map is stored in advance, thinning processing means for thinning out dots of figure data stored in the figure file group in accordance with a required reduction scale inputted from the outside, A layer priority setting unit for setting priorities in advance according to color attributes for each of the graphic types; and a layer priority when the coordinates of a plurality of graphic types of graphic data overlap during drawing after the thinning processing by the thinning processing unit. And a coordinate checking means for drawing graphic data of a graphic type having one color attribute according to the priority of the degree setting means. 4. The small-scale figure creation and display device according to claim 1, wherein the figure type is provided for each layer. 5. A graphic file group in which graphic data such as a map is stored in advance, and a thinning processing means for thinning out dots of graphic data stored in the graphic file group in accordance with a required reduction scale input from the outside; And a shape approximation processing means for thinning out each figure data after the thinning processing by the thinning processing means by a shape approximation process to create a small scale graphic. 6. A shape approximation processing means includes a distance approximation process for thinning out points within a predetermined distance from each point of a polygonal line forming each figure data, and extending from each point of each polygonal line forming each figure data. 5. The small-scale figure creating and displaying apparatus according to claim 4, wherein when the angle between the two sides is within a predetermined angle, one or both of the angle approximation processing and the thinning processing are executed.