JPH09311925A - Graphic data storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a graphic data storage system which can easily and quickly perform an internal processing that is due to a drawing updating processing. SOLUTION: This storage system includes a graphic information data base 12 which stores the graphic information including the identification number, type and attribute information of every graphic form included in an original drawing and a feature point data base 14 which stores the feature point information including the feature points representing the feature portions of a graphic shape such as the end point, the center point, etc., of every graphic form and the coordinate data on the feature points for every feature point. The information on the graphic form having the feature points included in a display area and the information on all feature points of the graphic form are extracted and displayed on a display graphic information table 16 and a display feature point information table 18, respectively. Then the only information on a certain graphic form and only the feature point information on the graphic form are deleted from a displayed drawing, and the coordinate data included in the feature point information on the graphic form are updated. Thus, the graphic form is moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to efficiently perform correction processing such as deletion and movement of graphics after construction when constructing a graphics database based on a graphics data storage system, particularly drawings such as map information. The present invention relates to a storage method of graphic data.

[0002]

2. Description of the Related Art Generally, computer mapping in which necessary graphic data is taken out from a graphic database created by reading map information (graphic information) into a computer and a drawing of a desired area is displayed is known as a water pipe, a gas pipe,
It is widely used in various fields such as public facilities management such as wiring and road management. For example, in power-related power distribution operations, a map of a certain area is displayed, and the arrangement of telephone poles and distribution lines in the area displayed is displayed, and parts such as distribution lines can be added or modified to provide equipment such as distribution lines. Management is performed for each region. Since the management range in each business is wide,
Conventionally, the original drawing of the map information is subdivided and managed for each figure data included in the subdivided range.

A conventional method of storing graphic data and a method of using the same will be described with reference to FIG. First, when making a database of a wide range of maps and topography,
The entire map (original drawing) was divided into vertical and horizontal parts with a constant width, and each figure used for displaying the map was managed for each divided area (hereinafter, small drawing). FIG. 13A shows an example in which the original drawing is divided into 24 small drawings A1 to F4. For example, in the figure c, the end points of the figure c
Although it is a straight line in 1 and B2, since this figure c spans the small screens A1, A2 and B2, FIG.
As shown in the conceptual content example of the figure database of
Figure c for each of the small screens A1, A2, B2 that are access units
1, c2, c3 are divided and stored. Further, since the figures b and d are contained in the small screens A2 and B1, respectively, the shapes of the figures b and d are stored as they are in the figure database without being divided.

A more detailed content of the graphic database is shown in FIG.
4 and FIG. FIG. 14 is a graphic information table that stores information regarding the divided small drawings of the original drawing. The “divided drawing number” is a number uniquely assigned to identify a small drawing and is A1 to F4 in FIG.
Is equivalent to The "lower left point" and "upper right point" store the lower left and upper right coordinate points of each small drawing. FIG. 15 is a small screen information table that stores information about graphics included in each small drawing. The “figure number” is a number for uniquely identifying the original figure before division, and corresponds to the figure c in the above example.
The “number of figures crossed over” is the number of small figures crossed over when the original figure straddles a plurality of small figures, and is 3 in the case of figure c. The "graphic crossing number" is a serial number of a graphic (crossing graphic) included in each small drawing when the original graphic spans a plurality of small drawings. In the case of the graphic c, the divided graphic c1,
Either c2 or c3. "Figure element data" is
Information (shape data) representing the shape of each of the divided divided figures corresponding to c1, c2, and c3 is stored. A concrete data structure of one block of the shape data is shown in FIG. 16. This shape data is composed of the types and attribute information of each divided figure included in the small screen, and the line type of the divided figure for each figure type. It has attribute information and coordinate information such as. "Number of continuous graphic elements"
Stores the number of blocks of each shape data, and "graphic element continuous serial number" stores the serial number of the block.

When a figure database is created, for example, when it is desired to display a portion of the area G which extends over the range of the small screens A1 and B2 based on the figure information which is divided and managed for each small screen, FIG. ) Small screen A1
After all the graphic data included in B2 is taken out from the graphic database and virtually drawn inside the computer, only the area G is displayed on the screen. Further, when the figure c is moved to the position of the figure c ′ as shown in FIG. 13D, the figures c1, c2, which are the constituent parts of the figure c, are moved.
Each c3 is retrieved from the graphic database and deleted. Then, the figure c'is divided into figures c1 ', c2', c3 'for each of the small screens A1, B1, A2 as a management unit, and predetermined figure data is created for each divided figure and stored in the figure database.

[0006]

In the conventional graphic data storage method, one graphic is divided and managed in units of small drawings as described above, so one graphic may be deleted or moved. Even at times, the graphic data must be moved and deleted by the number of divisions, which makes the internal processing very complicated. As described above, when one figure is divided and managed, the amount of data is increased by the division, and the processing time for displaying and correcting the figure is also increased by several times.

Further, one graphic is created, moved, and deleted in graphic units. For example, a distribution line or the like managed in a power distribution business is not divided in the middle of an electric pole as an end point, so it is desirable to treat it as one line data regardless of the length between the electric poles. . However, in the past, even in such a case, since the data was divided and managed in the database regardless of the characteristics of the graphic, the management of the data regarding one graphic was very complicated.

The present invention has been made to solve the above problems, and an object thereof is to provide a graphic data storage system capable of easily and quickly performing internal processing by drawing update processing. Especially.

[0009]

In order to achieve the above object, the present invention provides graphic data for displaying a graphic included in an original drawing in order to display a part of a wide range of the original drawing. In a graphic data storage system for storing coordinate information and attribute information of each graphic, one graphic is used as a management unit of graphic data.

In addition, in a graphic data storage system that stores coordinate information and attribute information of each graphic as graphic data representing the graphic included in the original drawing, the identification number, type and attribute information of each graphic included in the original drawing are stored. A graphic information storage unit for storing graphic information including each of the graphic information, and a feature point for storing the feature point information including the identification number of each graphic, the feature point of each graphic, and the coordinate data of the feature point for each feature point. An information storage unit is provided, and information about each figure included in the original drawing is managed for each figure.

In the present invention having the above configuration, the original drawing is managed without dividing it into small drawings, and accordingly, each figure included in the original drawing is managed in a figure unit without being divided. The graphic update process can be performed easily and quickly.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a graphic information system applied to an embodiment of a graphic data storage system according to the present invention. The present system includes an input unit 2 including various input means such as a keyboard, a mouse, and a pointing device for inputting characters and pointing a position on a display screen.
A display unit 4 for displaying a drawing such as a map based on the graphic data, a graphic database 6 for storing the graphic data of the original screen, and a work area 8 used for displaying the graphic included in the display area of the original drawing. And a graphic information processing unit 10 that collectively performs processing related to the graphic of the present system such as display control of the drawing, creation and correction of the graphic based on the graphic data. The figure database 6 is a figure information database 12 which is a figure information storage means for storing the figure information of each figure included in the original drawing for each figure, and the feature point information regarding the feature points of each figure is stored for each feature point. And a feature point information database 14 which is a feature point information storage unit. Details of the graphic information and the feature point information will be described later. The work area 8 is an area for temporarily storing information regarding a graphic to be displayed, which is extracted from the graphic database 6, and includes a display graphic information table 16 for temporarily storing the contents of the graphic information database 12 and a feature point information database. The display feature point information table 18 that temporarily stores the contents of 14 is included. The work area 8 is formed on the memory, but may be formed on a disk or the like. In the system having the above configuration, when the display area is specified by the designation from the input unit 2 or the internal processing, the graphic data of the graphic included in the display area is taken out from the graphic database 6 and stored in the work area 8. A graphic is displayed on the display unit 4 based on the stored graphic data.
Then, when a graphic is created or modified on the displayed drawing by an operation or instruction from the input unit 2, the content is reflected in the graphic database 6 via the work area 8. The present system is realized by a general-purpose computer that has an input / output unit and performs graphic processing such as CAD.

What is characteristic of the present embodiment is that one graphic is used as a management unit of graphic data without being divided into elements that make up the graphic. By enabling management in units of figures, it is not necessary to divide the entire original drawing into smaller drawings, the management of figure data is simplified, and the amount of data can be greatly reduced. In this embodiment,
In this way, one graphic is characterized as a management unit of graphic data. Here, graphic data handled in the present embodiment will be described.

In the present embodiment, the figure information that stores the information about the type of the figure, the attribute of each figure, and the feature point information that stores the information about the characteristic shape of each figure is set in each figure. I manage the shape with. In the present embodiment, the characteristic point means a point representing a characteristic of the shape of each figure such as an end point of a line segment, a vertex of a polygon, and a center point. 2 shows the contents of the graphic information, and FIG. 3 shows the contents of the characteristic point information.

The graphic information is created for each graphic included in the original drawing, and a "graphic number" for uniquely identifying each graphic, a "type" and a color code indicating the shape of the graphic,
An "attribute" for storing arbitrary attribute information required for each figure such as information about layer numbers and feature points is stored. Details of the “type” will be described later.

The feature point information is created for each feature point of each figure included in the original drawing, and is a "figure number" for uniquely identifying each figure and a "figure number" for uniquely identifying each feature point included in each figure. The "characteristic point number", the "x coordinate" and the "y coordinate" of the characteristic point are stored.

Here, with regard to basic figures handled in the present embodiment, concrete examples of figure information and characteristic point information are shown in FIG.
This will be described with reference to FIGS. The basic figure is composed of points, straight lines / polylines, polygons, circles / ovals, and general curves, and different types of basic figures are assigned as shown in FIG. The type of the basic figure shown in FIG. 4 is stored in the "type" of the figure information described above.

FIG. 5 shows graphic information and feature point information of the graphic P whose basic graphic is a point. For points, coordinates (x1, y
The point itself represented by 1) becomes the feature point p1.

A straight line / polyline represented by (n =) three straight lines and the end points of each of the (n + 1 =) four straight lines whose x and y coordinates are x1 to x4 and y1 to y4, respectively. FIG. 6 shows the graphic information and feature point information of the graphic Q that is. Each of the four end points becomes feature points q1 to q4. In the case of a straight line / polyline, the line type, the thickness of the line, the number of characteristic points, the arrangement order of the characteristic points, etc. are used as the attribute data.

This is a polygon represented by (n =) five straight lines and the end points of each of the (n =) five straight lines whose x and y coordinates are x1 to x5 and y1 to y5, respectively. FIG. 7 shows graphic information and feature point information of the graphic R. Each of the five end points becomes the feature points r1 to r5. For polygons, line type, line thickness,
Fill attributes, the number of characteristic points, etc. are used as attribute data.

A circle whose center coordinates are represented by (x1, y1) /
FIG. 8 shows graphic information and feature point information of the graphic S that is an ellipse. In the case of a circle / ellipse, the central coordinate (x1, y1) becomes the feature point s1. Line type, line thickness, fill attribute, major radius,
The minor axis, the inclination of the figure in the case of an ellipse, etc. are used as attribute data.

When the basic figure is a general curve, in the present embodiment, the x coordinate and the y coordinate are x1 to x10 and y, respectively.
It is approximated by a Bezier curve represented by points t1 to t10 of 1 to y10. FIG. 9 shows graphic information and feature point information of the graphic T that is a curve. In the case of a general curve, the line type, line thickness, fill attribute, number of characteristic points, etc. are used as attribute data.

The basic figures are composed of the above-mentioned five types, and it is considered that each figure included in the original drawing is classified into any one. Of course, this does not deny the provision of other types of basic figures. Further, the attribute of each basic figure is not limited to the above example. These setting contents are merely design matters, not the gist of the present invention.

FIG. 10 shows a part of an example in which the graphic information and the characteristic point information are created based on the original graphic that is almost the same as that used in the conventional description according to the above rules. In this way, the graphic information and feature point information of each graphic included in the entire original drawing are created in advance according to the above basic graphic.

Next, the processing of the graphic information processing unit 10 for displaying a graphic using the graphic database 6 will be described with reference to the flow chart shown in FIG.

First, in the present system, when the display area, that is, the area to be searched for the characteristic point information is specified by the input from the input unit 2 or the result of the internal processing (step 101), the characteristic points included in this area are identified. The characteristic point information database 14 is searched to extract the characteristic point information (step 102). The coordinates of two points R1 and R2 on the diagonal of the search target area are respectively (X1, Y
1), (X2, Y2) (where X1 ≦ X2, Y1 ≦ Y
2), feature points (x, y) satisfying X1 ≦ x ≦ X2 and Y1 ≦ y ≦ Y2 are sequentially searched.

If the graphic information corresponding to the graphic number contained in the read out feature point information is not stored in the display graphic information table 16 (step 104), the graphic information corresponding to the graphic number is stored in the graphic information database 12. Read out and write in the display graphic information table 16 (step 105). If the graphic information corresponding to the read graphic number is already stored in the display graphic information table 16, there is no need to store it in duplicate, so writing is not performed. When the figure to be displayed is extracted, the display feature point information table 18 among all the feature points in this figure is displayed.
The feature point information that has not been written into the feature point information database 14 is read out and written in the display feature point information table 18 (step 106). The target feature point information can be easily searched and written from the figure number of the feature point information.

The above processing is repeated for all the feature points included in the search target area, and the graphic information for all the graphics having the feature points in the display area is extracted and stored in the display graphic information table 16. Further, all the characteristic point information corresponding to each figure is extracted and stored in the display characteristic point information table 18. After taking out the necessary graphic data, drawing is performed in the work area 8 based on the data contained in the tables 16 and 18, and then the graphic is displayed only in the display area of the display unit 4. For example, FIG. 12 shows the contents of the display graphic information table 16 and the display feature point information table 18 when the display area H is displayed on the display unit 4 in FIG.
Since the display area H includes a part of the graphics A and C and the entire graphic D, each table stores graphic information and feature point information regarding the graphics A, C, and D. .

In the display drawing shown in FIG. 10, when the graphic C is deleted, for example, the graphic information processing unit 10 receives the effect and displays the graphic information in the work area 8 regarding the graphic C and the feature point information. delete. According to the present embodiment, since the figures are managed on a figure-by-figure basis, when deleting a figure, it suffices to delete only one piece of figure information of the figure to be deleted and feature point information related to the figure. Because it is only, the processing can be performed easily and quickly. In the past, since a figure was divided and stored for each small screen, when the process of deleting a certain figure is performed, accesses are generated by the number of divisions of the figure. In addition, the divided figures included in the small screen that are not the display object and that constitute the deletion object graphic must be searched for in the database and deleted.

Further, for example, when the figure C is moved, the figure information processing unit 10 only needs to update the coordinate data included in the feature point information when receiving the fact, so that the figure information processing section 10 can simply and quickly perform the process. You can In the past, when moving a figure, it is possible to move the small screen,
It is impossible to deal with it simply by updating the coordinate data. Needless to say, the result of the editing process in the present embodiment is finally reflected in the graphic database 6.

As described above, according to the present embodiment, since the graphic data of each graphic is managed in graphic units, the editing process for the displayed drawing can be performed very easily as described above. . In the present embodiment, if at least the characteristic points are not included in the display area, even if a graphic is included in the display area, they are not searched in the process of step 102 shown in FIG. The feature points have been described above as the points that represent the features of the figure such as the end points. However, even if they are not the end points or the center points, the feature points are provided at some intervals on the figure according to the actual work. Can be dealt with.

[0033]

According to the present invention, it is possible to display a figure included in a portion to be displayed without dividing the entire original drawing into small drawings and managing them. As a result, one figure can be used as a management unit of figure data without dividing the figure included in the original drawing into subelements for dividing a small screen. And it can be done quickly. For example, when a certain figure on the display drawing is deleted, it is only necessary to delete only one piece of figure information of the figure to be deleted and characteristic point information related to the figure, so that the deletion process can be easily performed. Further, when a certain figure on the display drawing is moved, only the coordinate information included in the feature point information relating to the figure to be moved needs to be updated, so that the moving process can be easily performed.

Further, since it is not necessary to divide the figure into subelements, the amount of data is reduced correspondingly and the number of accesses to the figure data at the time of updating the drawing is also reduced, so that the processing speed is improved. You can

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a graphic information system applied to an embodiment of a graphic data storage system according to the present invention.

FIG. 2 is a diagram showing a data structure of a graphic information database according to the present embodiment.

FIG. 3 is a diagram showing a data structure of a feature point information database in the present embodiment.

FIG. 4 is a diagram showing types of basic figures in the present embodiment.

FIG. 5 is a diagram showing an example of contents of graphic information and feature point information when a basic graphic is a point in the present embodiment.

FIG. 6 is a diagram showing an example of contents of graphic information and feature point information when a basic graphic is a straight line / polyline in the present embodiment.

FIG. 7 is a diagram showing an example of contents of graphic information and feature point information when a basic graphic is a polygon in the present embodiment.

FIG. 8 is a diagram showing an example of contents of graphic information and feature point information when a basic graphic is a circle / oval in the present embodiment.

FIG. 9 is a diagram showing an example of contents of graphic information and feature point information when a basic graphic is a general curve in the present embodiment.

FIG. 10 is a diagram showing an example of setting graphic information and feature point information in the present embodiment.

FIG. 11 is a flowchart showing a process of a graphic information processing unit for displaying a graphic using a graphic database in the present embodiment.

12 is a diagram showing the contents of graphic information and feature point information relating to a graphic included in the display area shown in FIG.

FIG. 13 is a diagram used for explaining a data storage method according to a conventional graphic data storage method and a method of using the data storage method.

FIG. 14 is a diagram showing a graphic information table conventionally used.

FIG. 15 is a diagram showing a small screen information table used conventionally.

FIG. 16 is a diagram showing a specific data structure of one block of shape data included in a conventional small screen information table.

[Explanation of symbols]

2 input section, 4 display section, 6 figure database, 8
Work area, 10 graphic information processing unit, 12 graphic information database, 14 feature point information database, 16 display graphic information table, 18 display feature point information table.

Claims (2)

[Claims] 1. A graphic data storage system for storing coordinate information and attribute information of each graphic as graphic data for displaying a graphic included in an original drawing for displaying a part of a wide range of the original drawing. A graphic data storage method characterized in that the entire graphic is used as a management unit for graphic data. 2. A figure data storage system for storing coordinate information and attribute information of each figure as figure data representing the figure included in the original drawing, wherein the identification number, type and attribute information of each figure included in the original drawing are stored. A graphic information storage unit for storing graphic information including each of the graphic information, and a feature point for storing feature point information including the identification number of each graphic, the feature point of each graphic, and the coordinate data of the feature point for each feature point. A graphic data storage system characterized by comprising: information storage means, and managing information on each graphic included in the original drawing in graphic units.