JP3162130B2 - Graphic data input method and graphic data output method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, your graphic data input method
And a graphic data output method, for example, an input method of graphic data when constructing a map database in computer mapping, and an output method of graphic data when reading and outputting graphic data of an arbitrary drawing from the map database, Graphic data for specifying various lines that are graphic elements in the drawing includes coordinate data indicating the position of a point on the line and a line segment between the points on the line. It relates to data having attribute data indicating type, width, color, and the like.

Generally, by processing graphic data (map data) by a computer, a map of an arbitrary area,
For example, it is widely used to create and modify drawings showing the state of burial of underground objects such as gas pipes, water pipes, communication pipes, and power pipes, drawings showing roads, and drawings showing the arrangement of real estate and buildings. It is used in various fields such as housing management, utility management, road management and administrative management.

[0003]

2. Description of the Related Art In order to create such various drawings, it is necessary to construct a map database for each figure in the drawing. Conventionally, these various figures are digitized and input. Various graphic elements as shown in FIG. 6 are used as the minimum unit in this case. For example, for a line segment sequence, the x coordinate and y coordinate of each inflection point are input as coordinate data, and the outline of the graphic is specified. ing.

In order to make the created map easier to use, attribute data indicating the type (solid line, dotted line, etc.), thickness, color, etc. of each graphic element is input together with the coordinate data. In addition, it is also common to create a map database using graphic data (hereinafter, referred to as line drawing data) composed of these two data.

A conventional line drawing data format as shown in FIG. 7 is used. One of them is to construct line drawing data by storing attribute data in a header and storing coordinate data in a data area following the attribute data. For example, in the case of line drawing data of a line segment sequence,
As shown in (a), the header 71 indicates “SEL
2 and a "color number" indicating the color of the line segment, and the data area 72 stores "x-coordinate and y-coordinate of the start point and end point of the line segment" (introduction to personal computer mapping, K .
WESTLAND, published by Nikkan Kogyo Shimbun, p. 79).

The other is to construct line drawing data by storing coordinate data and attribute data in respective dedicated areas set in a data area following a header. For example, line drawing data of a line segment sequence is formed. In the case of (b), as shown in (b), the data area 72 is defined as a three-dimensional data array format, and the “x-coordinate and y-coordinate of the start point and the end point of the line segment” are set in the first and second areas, respectively. The "line type tag" is stored in the third area (digital mapping, supervised by GSI, published by Kashima Shuppan, page 44).

[0007]

As described above, in the conventional line drawing data format, the attribute data storage area is set separately from the coordinate data storage area. If there is a change in the middle, the attribute data of the header part must be created as new line drawing data each time (in the case of FIG. 7A), or if there is no change in the attribute data, A storage area dedicated to attribute data is wasted [FIG. 7 (b)
At the time).

Therefore, in the present invention, the data array of the coordinate data and the attribute data is set to a common format, for example, a two-dimensional array, so that any of these data can be selectively stored in the data area composed of the data array. It is another object of the present invention to make the format of line drawing data lean and efficient by making the sign of each data different in order to identify both data.

[0009]

According to the present invention, coordinate data and attribute data constituting the line drawing data are input to a common data area in a state where the signs of the respective data are different from each other, and the data are input in units of drawings. When a graphic database is constructed and line drawing data of a specific drawing is read from the graphic database and processed, it is discriminated whether the obtained data is coordinate data or attribute data by judging the sign thereof. It is like that.

FIG. 1 is a diagram illustrating the principle of the present invention. In the drawing, reference numeral 1 denotes an input target diagram, which is a local drawing in which a line (P ₁ -P ₂ -P ₃ -P ₄ ) indicating a gas pipe burying position or the like is written. Reference numeral 2 denotes an input unit which sets the input target drawing 1 on, for example, a digitizer or the like, and designates predetermined points P _{1 to} P ₄ of the input target line by moving a cursor to change its coordinate data.
For example, enter a value with a positive sign and (P ₁ -P ₂ )
Attribute data indicating the type, width, color, etc. of each line segment,
For example, a value having a negative sign is input. Reference numeral 3 denotes a format example of graphic data (line drawing data), in which the coordinate data and the attribute data are arranged in a common format.
For example, it is set in a two-dimensional data array. Reference numeral 4 denotes a map database, which is constructed from a data string of coordinate data and attribute data on the input target line. Reference numeral 5 denotes an application program, and a map database 4
, Predetermined graphic data is read from the memory, and coordinate data and attribute data in the graphic data are distinguished from each other, and corresponding editing processing is performed. Reference numeral 6 denotes an output unit that displays and prints a figure based on the editing process performed by the application program 5.

Here, the processing procedure by the application program 5 is as follows. That is, line drawing data of a drawing desired to be displayed and printed is read from the map database 4, and the process proceeds to the next step. Data to be processed is extracted from the line drawing data in data array units, and the process proceeds to the next step. It is determined whether the sign of the data to be processed is “positive”, and if “YES”, the process proceeds to the next step and “N
If "O", go to step. Edit processing as coordinate data is performed, and the process returns to the step. The editing process as the attribute data is performed, and the process returns to the step. The desired drawing is issued by such editing processing.

[0012]

According to the present invention, when the line drawing data used for constructing the map database is represented by a data string composed of coordinate data of each point on the line and attribute data of a line segment between the points, The coordinate data storage area and the attribute data storage area are shared by setting the data array of the coordinate data and the attribute data to a common format and making the sign of each data different. is there.

Here, among the various attributes, those frequently used, for example, the solid line (in FIG. 1) are defaulted, and the attribute data is omitted. Then, it is optional how to assign the positive and negative signs of the coordinate data and the attribute data, and a negative sign is given to the coordinate data,
A positive sign may be given to the attribute data.

According to the present invention, not only a line segment sequence is input but also line drawing data can be input for various lines as shown in FIG. 6, for example, the radius of a circular arc can be input. And code data designating the direction of the bulge may be input as attribute data.

Furthermore, even when the input line is a "semicircle", the input unit 2 draws a semicircle between the point specified by the coordinate data and the next point, and determines the direction of the bulge. Code data to be instructed may be used as attribute data,
When a "circle" is input, it is only necessary to divide the image into two semi-circles or a plurality of arcs, and then perform the above-described input processing on each part.

[0016]

An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing an outline of a line drawing data input / output system according to the present invention.
Reference numeral 21 denotes a large-capacity external disk storage device that stores a map database, 22 denotes a large-capacity external disk storage device that stores an application program for performing drawing output processing and the like, and 23 denotes attribute data having a keyboard. An input unit, 24 is a display unit for confirming input of graphic data, 25 is a digitizer for inputting coordinate data of an input target point of the set drawing by moving a cursor, 26 is an output sent from the host computer 20 A display device having a function of displaying a desired drawing based on the application data and a search function, and a plotter device 27 for printing out the desired drawing on recording paper are shown.

Here, the line database data is stored in the map database 21 for each drawing to be input, for example, for each drawing number, and the application program is designated by the operator. Line drawing data read from the map database 21 based on the drawing number
Process and release data, and host computer
The entire system is controlled through 20.

[0018] Figure 3 is an input target line, the line drawing de - a diagram showing the format of data, 30 denotes an input target line, P _i
Is the i-th input point, (x _i , y _i ) is the coordinate data of the input point P _i , 31 is a header, 32 is an area for storing the number of line drawing data, and 33 is a two-dimensional data. A line image data area 34 composed of a data array indicates an attribute data area in the line image data area.

That is, the number of line drawing data of the input target line is "21" and the number of coordinate data is "1".
8 ", the data number of the attribute data is" 3 ", and each attribute data is stored as code data having a negative sign in a portion corresponding to the x coordinate of the coordinate data in the two-dimensional array. I have. The storage location may be a portion corresponding to the y coordinate of the coordinate data.

[0020] Then, FIG. 4 is an explanatory diagram showing the contents of each attribute data, Figure 3 of the line image de example - between the motor "-4" is P ₄ and P ₅ - 5 th attribute de in data the line segments are those traveling toward the left semicircular and 11 th attribute de - data "- 2" are those segments between P ₉ and P ₁₀ are the broken lines It is shown that.

The attribute data shown in FIG. 4 is composed of a 32-bit negative number, and can be distinguished from each other by a bit number which becomes "1" when complemented by "2". , By selecting each attribute data as a negative number in which only two bits of the leading bit and one of the remaining bits are "1", the complement of "2" is obtained. The processing may be omitted.

FIG. 5 is an explanatory diagram showing a flow when outputting a designated drawing. That is, (1) the host computer 20 reads the data group of the designated drawing number from the map database 21 and proceeds to the next step. (2) The next data to be processed is extracted from this data group, and the process proceeds to the next step. (3) It is determined whether or not the processing has been completed for all the data to be processed, and if "YES", the output processing of the designated drawing ends, and if "NO", the procedure proceeds to the next step. . (4) Regarding the data to be processed, it is determined whether or not the data is line drawing data by examining a header portion thereof and the like.
If "YES", proceed to the next step; if "NO", proceed to step (6). (5) Number N of line drawing data (data in area 32 in FIG. 3)
And sets an initial value "1" of a variable M for designating a data area to be processed next.
Proceed to (7). (6) Perform the corresponding subroutine processing and go to step (2)
Return to (7) It is determined whether N is a positive integer. If “YES”, proceed to the next step; if “NO”, perform step
Return to (2). (8) The M-th data in the line drawing data is extracted, and the process proceeds to the next step. (9) It is determined whether the sign of this data is "positive". If "YES", proceed to the next step, and if "NO", proceed to step (11). (10) An editing process is performed such that the point whose x-coordinate and y-coordinate are specified by the data of the two-dimensional array is set as the end point of the line segment, and the process proceeds to step (12). (11) A process for recognizing attribute data and outputting a corresponding line segment, for example, a subroutine call process, is performed.
Proceed to the next step. (12) "N-1" is new N and "M + 1" is new M
And return to step (7). According to such a procedure, each of the line drawing data read from the map database is processed.

Here, since the attribute data indicating the solid line is omitted (see FIG. 4), when the data of the positive sign continues in step (9), the end point is determined in the editing processing in the next step (10). A subroutine for connecting the lines with a solid line is executed,
When the data of the negative sign, for example, the fifth data in the line drawing data of FIG. 3 is detected in step (9), the subroutine corresponding to this attribute data is called, and the next sixth data is obtained. - the P ₅ so that the semicircle is drawn between the P ₄ and P ₅ this subroutine is running at the specified stage by data.

[0024]

According to the present invention, a figure database on a drawing to be input is digitized to construct a map database, and a predetermined data group is read out from the map database and based on this data. When drawing line drawing data used for displaying and printing a drawing in a form of a data string including coordinate data representing the position of each point on the line and attribute data representing the type of line segment between the points, etc. By setting the data array of the coordinate data and the attribute data in a common format, for example, a two-dimensional data array, and making the sign of each data different, coordinate data and attribute data are stored in each data area. Since each of the data can be selectively stored and the sign of the data can be used to identify both data, graphic data in a format that has a high degree of freedom and is not wasteful. Ede - data) is ensured, as a result, graphic de - be reduced file capacity to store the data and the graphic data of to display and print the desired drawing -
Data output processing can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram showing an outline of a line drawing data input / output system according to the present invention.

FIG. 3 is an explanatory diagram showing an input target line and a format of the line drawing data.

FIG. 4 is an explanatory diagram showing the contents of each attribute data according to the present invention.

FIG. 5 is an explanatory diagram showing a flow of outputting a designated drawing according to the present invention.

FIG. 6 is an explanatory diagram showing various graphic elements generally used when numerically inputting a graphic.

FIG. 7 is an explanatory diagram showing a format of conventional line drawing data.

[Explanation of symbols]

 In FIG. 1, 1 ... input target drawing 2 ... input unit 3 ... format example of graphic data (line drawing data) 4 ... map database 5 ... application program 6 ... output unit

Continuation of front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G06T 1/00 G06T 11/00-11/80 G09B 29/00

Claims (3)

(57) [Claims] 1. Graphic data for specifying a line serving as a graphic element in a drawing to be input includes coordinate data of a point on the line and a line between points on the line. In the graphic data input method having attribute data of the coordinate data, the coordinate data and the data array of the attribute data have a common format as the graphic data, and The sign of the data is set to one of the positive and negative signs, and the sign of the attribute data is set to the other of the positive and negative signs. Each of the data areas consisting of the data array contains the coordinate data. A graphic data input method, wherein data and the attribute data are selectively stored. 2. A database storing, for each drawing, graphic data having coordinate data of points on a line which is a graphic element in the drawing and attribute data between the points on the line. figure de were to read the graphic data of the designated drawing from - the data output method, as the graphic data, the coordinate data - data and the attribute de - data de - in data sequence common format, and the coordinate data The sign of the data is set to one of the positive and negative signs, and the sign of the attribute data is set to the other of the positive and negative signs, and the sign is checked with respect to the graphic data read from the database. A graphic data output method for determining whether the content is the coordinate data or the attribute data. 3. The method according to claim 2, wherein said coordinate data and said attribute data are
Executing an editing process according to the determination result.
It is noted that the designated drawing is shown on the output unit.
3. The graphic data output method according to claim 2, wherein: