JPH10301978A - Graphic data converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the conventional time and labor for performing manual correction for the separated end parts of a two-dimensional graphic by calculating the reference point of a vector graphic from an intersection after rounding and generating the vector graphic data of second accuracy. SOLUTION: The graphic data of single accuracy before conversion are read and whether or not the read data 4 are circular arc data is discriminated. In the case of the circular arc data, the coordinates of a start point and an end point are obtained, the circular arc data are regenerated based on them, rounding is performed so as to bring the end point of two line segment data which are the data 4 before the conversion and the end point of the circular arc data into contact and the graphic data 5 of double accuracy are generated. Also, in the case that the data 4 are the line segment data, for the start point and end point coordinates of the taken-out line segment data, rounding is performed within the range of the digit of the single accuracy and the coordinate values of the start point and the end point after the conversion are obtained. Thus, the coordinates of the end points of the two line segments and the start point and end point of the circular arc data are completely automatically matched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic data converter for converting the precision of graphic data.

[0002]

2. Description of the Related Art Conventionally, when graphic data to be used in an old CAD system has been created and stored in single precision, in order to use this as double-precision graphic data to be used in a new CAD system, the old single data is used. It is necessary to convert high precision graphic data to double precision graphic data. At this time, when the old single-precision graphic data is displayed as it is as the new double-precision graphic data, it may be determined that the end points do not touch each other. In particular, in the case of three-dimensional CAD, if the end points of the original two-dimensional figure are apart from each other, the normal operation will not be performed. Therefore, these end points have been corrected so as to be manually touched on the CAD.

[0003]

As described above, the old C
If the single-precision graphic data of the AD system is displayed in double precision of the new CAD system, etc., especially the endpoints will be determined apart, so it will be necessary to manually correct the endpoints so that the endpoints do not separate even in double precision. There was a problem of doing it.

[0004] The present invention solves these problems,
The intersection of the vector graphics that does not use the intersection of the plurality of vector graphics as the reference point among the plurality of intersecting vector graphics is set to an accuracy equal to or less than the first accuracy and the second accuracy, and the reference point of the vector graphic is determined from the intersection after rounding. Is calculated to generate vector graphic data of the second accuracy, and to automatically perform conversion so that end points such as arc data and line segments in the graphic data are in contact with each other.

[0005]

Means for solving the problem will be described with reference to FIG. In FIG. 1, a processing device 1 performs various processes according to a program.
Here, it is configured by a coordinate rounding means 2 and an arc data regenerating means 3.

The coordinate rounding means 2 rounds the coordinates of the graphic data 4 within the range of the digits of the original precision. The arc data regenerating means 3 regenerates the arc data based on the coordinates after rounding the coordinates of the start point and the end point of the arc data in the graphic data.

The graphic data 4 is data before conversion.
The graphic data 5 is data after conversion. Next, the operation will be described.

[0008] Of the plurality of vector graphics intersecting by the first processing means, the intersection of the vector graphics that does not use the intersection of the plurality of vector graphics as the reference point is set to an accuracy equal to or less than the first accuracy and the second accuracy. The second processing means calculates a reference point of the vector graphic from the intersection point after rounding to generate vector graphic data of the second accuracy.

At this time, a vector graphic not based on the intersection is an arc graphic, and the intersection is a starting point and an ending point of the arc.
The arc data regenerating means 3 as the second processing means determines the center of the second precision which is the reference point of the arc figure from the starting point, the ending point and the radius of the arc of the first precision and the precision lower than the second precision. The coordinates are calculated, and the radius, start angle, and end angle of the arc are calculated from the calculated center coordinates and the start point and end point of the arc.

The arc data regenerating means 3, which is the second processing means, calculates the coordinates of the starting point and the ending point after rounding, the distance from the starting point after rounding to the original center coordinates, and the distance from the ending point after rounding to the original center coordinates. The center coordinate is determined using the average value of the distance to the center as a radius.

A first processing means for setting the intersection of the vector graphics which does not use the intersection of the plurality of vector graphics intersecting as the reference point among the plurality of intersecting vector graphics to a precision equal to or lower than the first precision and the second precision. And a program functioning as a second processing means for calculating a reference point of the vector graphic from the intersection after rounding and generating vector graphic data of the second precision is loaded on a main memory of the computer system and operated. I have to.

Therefore, the intersection of the vector graphics which does not use the intersection of the plurality of vector graphics as the reference point among the plurality of intersecting vector graphics is set to the first accuracy and the second accuracy or less, and from the intersection after rounding, By calculating the reference point of the vector graphic and generating the vector graphic data of the second precision, it is possible to automatically perform conversion so that the end points of the arc data and the line segments in the graphic data are in contact with each other.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments and operations of the present invention will be sequentially described in detail with reference to FIGS. Here, the program functioning as the coordinate rounding means 2 and the arc data regenerating means 3 in FIG.
Is loaded on a main memory (not shown) to perform the processing of S1 to S11 in FIG. 2 described later.

FIG. 2 is a flowchart illustrating the operation of the present invention. This is a flowchart in which arc data and line segment data are extracted from graphic data under the configuration of FIG. 1 and are automatically converted so that end points are in contact with each other.

In FIG. 2, S1 reads data. This is the single-precision graphic data 4 before conversion shown in FIG.
Read. For example, two line segment data describing the original shape of FIG. 3 described later and one arc data are read.

In S2, it is determined whether the arc is a circular arc. This is to determine whether the data (figure data 4) read in S1 is arc data. In the case of YES, the coordinates of the starting point and the ending point are obtained by S3 to S7, and the arc data is recreated based on the coordinates. In the example of FIG.
Rounding is performed so that the end points of the line segment data and the end points of the arc data are in contact with each other, and the double-precision graphic data 5 is obtained.
Generate On the other hand, if NO in S2, the process proceeds to S8.

In S8, it is determined whether the line segment is a line segment. In the case of YES, line segment data is extracted in S9, and the start point coordinates and the end point coordinates of the extracted line segment data are within the range of the original precision (here, single precision) digits in S10, as in S4. Is performed, and the coordinate values of the converted start point and end point are obtained. On the other hand, in the case of NO, other processing (for example, point, ellipse, multiline, linear splan,
Regarding the splint, the offset splint, and the like, after rounding the coordinates within the range of the original precision (for example, single precision) at the point corresponding to the end point in the same manner as in S3 to S7 described later, the respective data are reproduced. Creation process)
I do. Hereinafter, a procedure for rounding the coordinates of the start point and the end point of the arc data and regenerating the arc data based on the coordinates of the start point and the end point after the rounding will be described in detail.

In step S3, arc data is extracted. Here, only the arc data is taken out of the graphic data. The following shown in the figure is extracted as arc data. Center coordinates: X, Y Radius: r Start angle: θs End angle: θe Here, as shown in FIG. 3, the center coordinates (X, Y) as the arc data are the coordinates of the center O of the arc. The radius r is the distance from the center coordinate to the arc, the start angle θs is the angle from the X axis to the start point in the counterclockwise direction about the center coordinate, and the end angle θe is the distance from the X axis about the center coordinate. The angle to the end point in a counterclockwise direction.

In step S4, the coordinates of the start point and the end point are obtained. That is, the coordinates of the starting point are obtained from the center coordinates (X, Y), the radius r, and the starting angle θs of the original arc data in S3, and similarly, the end point is obtained from the center coordinates (X, Y), the radius r, and the ending angle θe. Find the coordinates of
The obtained coordinates of the start point and the coordinates of the end point are rounded within the range of the precision of the original arc data (for example, within the range of 6 digits in the case of single precision), and the coordinates of the start point and the end point after the rounding are performed. Ask for.

In step S5, a radius r 'is obtained from the start point and the end point after rounding and the original center coordinates (X, Y). That is, a distance 1 from the start point after rounding to the center coordinates (X, Y) and a distance 2 from the end point after rounding to the center coordinates (X, Y) are obtained, and the average value of these distances 1 and 2 is calculated. The radius is determined as r '.

S6 is the coordinates of the starting point and the ending point after rounding,
The center coordinates are obtained from the radius r '. In this method, a point having a radius r ′ is obtained from the coordinates of the start point and the coordinates of the end point after rounding, and coordinates closer to the original center coordinates are determined as center coordinates (X ′, Y ′).

In step S7, a start angle θs ′ and an end angle θe ′ are obtained from the coordinates of the start point and the end point, the radius r ′, and the center coordinates (X ′, Y ′). According to the above S3 to S7, the coordinates of the starting point and the ending point of the original arc data are obtained and rounded, and the coordinates of the starting point and the ending point after the rounding are obtained, and in the example of FIG. After conversion so that the end points are in contact with each other, the remaining radius r 'and center coordinates (X',
Y ′), the start angle θs ′ and the end angle θe ′ can be recreated. Thus, in the example of FIG. 3, rounding is performed on the endpoints of the two line segments within the range of the precision digit of the original data (for example, within the range of the single precision digit), and the result is converted into a new endpoint. The coordinates of the end points of the two line segments and the coordinates of the start point and end point of the arc data can be completely automatically matched. Then, after converting the end points of these line segments and the start point and end point of the arc data to coincide with each other, the arc data is re-created from these start points and end points. Even if there is an end point of the arc data, it can be automatically converted so that the end points of the line segment data and the arc data are in contact with each other even if the end point of the arc data is converted to the double precision graphic data 5.

When re-creating the center coordinates of the arc data, the coordinates of the above-mentioned rounded start point and end point, the distance from the rounded start point to the original center coordinates, and the rounded end point to the original center coordinates. Although the center coordinates are obtained using the average value of the distance to the center as the radius, the present invention is not limited to this, and the center coordinates may be obtained based on the coordinates of the start point and the end point after rounding and the original radius. In the latter case, the start point θs and the end angle θ
When the angle between e and 180 is near 180 °, the radius may not reach the start point and the end point in some cases. In this case, the radius may be corrected to reach the start point and the end point.

FIG. 3 is a diagram for explaining the conversion of arc data according to the present invention. Here, the alternate long and short dash line indicates a state when the original shape (single precision) is displayed with double precision. This is because the original single-precision shape data of the dashed line is displayed in double precision as it is, and the line segment data is directly displayed in double precision because it has the coordinate data of the end point directly, but the arc data is the coordinate data of the end point , The starting point and the ending point are displayed based on the center coordinates (X, Y), the radius r, the starting angle θe, and the ending angle θe. It is displayed so as not to touch. Therefore, in the present invention, the coordinates of the starting point and the ending point are obtained from the original arc data, and the coordinates of the starting point and the ending point are within the range of the original single-precision digit (in the case of the single precision, within the range of 6 digits). The coordinates are rounded (), and the coordinates of the end points are similarly rounded for the line segment data so that they match, and the radius r ′ is determined based on the coordinates of the rounded start point and end point.
(), Center coordinates (X ', Y') (), then start angle θ
This figure shows how the arc data after rounding is automatically generated in the order of s ′ and end angle θe ′ ().

[0025]

As described above, according to the present invention,
The intersection of the vector graphics that does not use the intersection of the plurality of vector graphics as the reference point among the plurality of intersecting vector graphics is set to an accuracy equal to or less than the first accuracy and the second accuracy, and the reference point of the vector graphic is determined from the intersection after rounding. Is calculated to generate the vector graphic data of the second accuracy, so that the automatic conversion can be performed so that the end points of the arc data and the line segments in the graphic data are in contact with each other. This eliminates a situation in which the graphic data 4 of the old CAD system is automatically converted and transferred to the graphic data 5 of the new CAD system so that the end points of line segment data, arc data, etc. do not touch each other. It has become possible to eliminate the trouble of manually correcting the end points of a two-dimensional figure apart.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of the present invention.

FIG. 2 is a flowchart illustrating the operation of the present invention.

FIG. 3 is an explanatory diagram of conversion of arc data according to the present invention.

[Explanation of symbols]

 1: Processing unit 2: Coordinate embedding means 3: Arc data regenerating means 4: Graphic data (before conversion) 5: Graphic data (after conversion)

Claims (4)

[Claims] 1. A vector graphic data conversion apparatus for converting vector graphic data of a first precision into vector graphic data of a second precision, wherein an intersection of the plurality of vector graphics intersects among a plurality of intersecting vector graphics. A first processing means for making the intersection of a vector graphic not having a reference point as the reference accuracy the first accuracy and the second accuracy or less; and calculating a reference point of the vector graphic from the intersection after the rounding. And a second processing means for generating vector graphic data of the second accuracy. 2. The method according to claim 1, wherein the vector graphic not based on the intersection is an arc graphic, the intersection is a start point and an end point of the arc, and the second processing means has an accuracy lower than the first accuracy and the second accuracy. From the start point, end point and radius of the arc, calculate the center coordinates of the second accuracy, which is the reference point of the arc figure, and calculate the radius, start angle and end of the arc from the calculated center coordinates and the start point and end point of the arc. The vector graphic data conversion device according to claim 1, wherein the angle is calculated. 3. The method according to claim 2, wherein the second processing means includes a starting point after rounding,
2. The center coordinates according to claim 1, wherein the coordinates of the end point, the average value of the distance from the start point after rounding to the original center coordinates and the average value of the distance from the end point after rounding to the original center coordinates are determined as the radius. Graphic data converter. 4. A plurality of intersecting vector graphics, wherein the intersection of vector graphics which does not use an intersection at which the plurality of vector graphics intersect as a reference point has an accuracy lower than the first accuracy and the second accuracy. A first processing unit, and a storage medium storing a program that functions as a second processing unit that calculates a reference point of the vector graphic from the intersection after the rounding and generates vector graphic data of a second accuracy. .