JPS59214988A - Drawing coordinate data input method - Google Patents

Abstract

PURPOSE:To input accurately coordinate data of a drawing having an optional size stuck to an optional position on a tablet by providing >=3 reference points on the drawing and inputting first coordinates of these reference points on the tablet. CONSTITUTION:A drawing 6 is stuck onto a tablet 1. In this case, it is stuck to an optional position in horizontal, vertical, and rotative directions. Respective center points of reference points 7, 8, and 9 are designated with a stylus pen to input coordinate data of reference points on the tablet. Meanwhile, coordinate data of reference points on the drawing are stored in a storage device beforehand. Consequently, since coordinate values of reference points on the tablet 1 and the drawing 6 are known, coordinates on the tablet can be converted to coordinates on the drawing.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for inputting coordinate data of blueprints such as design drawings, rurui, '1# buried diagrams, etc. The present invention relates to a method for inputting coordinate data of a drawing using a tablet, which is suitable for inputting coordinate data of a drawing created using a graphic display.

[Background of the invention]

Conventionally, when inputting data using a tablet, (1) the drawing is pasted onto the tablet while being accurately aligned with the specified position; Alternatively, it has been common practice to paste the 0 drawing at an arbitrary position on the tablet so as not to shift the rotation, and then input the coordinate origin of the drawing to make the computer recognize the position of the drawing on the tablet. However, in the case of (2), there is a drawback that there is a possibility that an error may occur in the input coordinate data due to a deviation from the specified position of the attached drawing. Furthermore, in the case of (2), disadvantages such as errors due to deviations in the rotational direction or errors due to expansion/contraction of the drawings occur frequently. Furthermore, in both cases (1) and (2), even if the drawings are the same, if the drawings are of different sizes, a separate coordinate data input program must be created.

[Purpose of the invention]

An object of the invention is to provide a coordinate data input method for accurately inputting all coordinate data of a drawing of any size pasted at any position on a tablet.

[Summary of the invention]

Coordinates on the tablet can be easily input using a stylus pen. Therefore, in order to achieve the above object, it is sufficient to devise a method for converting coordinates on the tuffret to coordinates on the drawing with high precision. In the present invention, three or more reference points are provided on the drawing, and the coordinates of these reference points on the tablet are first inputted using a stylus pen. In addition, the coordinates of these reference points on the drawing are stored in advance in the computer 2@, and the above-mentioned coordinate change embodiment [embodiment of the invention] will be described below using the input coordinates on the tufflet. This will be explained in detail with reference to examples.

FIG. 1 is a schematic diagram of a tablet device used in the present invention. 1 is the tablet, 2 is the input position t' on the tablet
3 is a computer, 4 is a storage device, and 5 is a graphic display device. FIG. 2 is an example of a drawing attached to a tablet. 6 is a drawing sheet, and 7, 8.9 are reference points for associating the coordinate positions of the tablet and the drawing. The coordinates of these reference points on the drawing are stored in advance in a storage device. Here, when using a drawing created with a plotter connected to a computer or a graphic display terminal, it is preferable to also store the coordinates of the reference points on the drawing in the storage device when the drawing is created.

The method for inputting the coordinate data of these drawings will now be explained in detail. Paste drawing 6 on tablet 1. At this time, the pasting position is arbitrary in both the horizontal and vertical directions and the rotational direction. Next, by indicating the center point of each of the reference points 7° 8.9 with the stylus pen 2, the coordinate data of the reference points on the tablet is input. The drawing coordinate data of the reference point on the drawing 6 is stored in advance in the storage device 4 as described above. Therefore, the coordinate values of the reference point on the tablet 1 and on the drawing 6 are known, and the coordinates on the tablet can be converted into the coordinates on the drawing.

Hereinafter, a specific method of the coordinate transformation described above will be explained using FIG. 1 is a doublet, 6 is a drawing paper, and 7.8.9 is a reference point. Reference numeral 11 indicates an arbitrary point on the drawing for which coordinate values are to be input. Now, consider the case where three reference points 7, 8.9 are taken so that line numerator 1 and line segment 79 are perpendicular to each other. Here, all the coordinate values on the tablet of the reference point 7° 8.9 (Xo.

yo), (X,, Y,), (X2, Y2), and the coordinate values on the drawing are (Xo+yo) and 'XI, respectively.
+ y +), (X2 + J2), the coordinates (x, y) of an arbitrary point 1゛1 on the drawing are the coordinate values (X, Yi) on the tablet input using the stylus pen,
It is determined by the following equations (1) and (2).

Here, α is a coefficient representing whether the length of one unit in the X1 force direction of the coordinates on the drawing corresponds to the length of the unit in the x@force direction of the coordinates on the tablet, and β is the y-axis and the y-axis. A similar coefficient for . These α.

β can be calculated using the following formula.

2 θ is the angle between the y-axis on the tablet and the y-axis on the drawing. The sine and cosine of θ can be determined using equations (5) and (6).

Note that, as described above, the coordinate value data of the reference point is important data at the time of coordinate transformation. Therefore, it is necessary to thoroughly check whether the coordinate value data of the reference point has been input correctly. For example, this check is performed by line segment 78 and line segment 7.
This can be achieved by checking whether the angle formed by 9 matches the angle formed by 9 when the drawing was created. In the case of this example,
Since both line segments are orthogonal, it is sufficient to check whether the following equation (7) holds or not.

(XI xn)2+ fY+ yo)2++x2
Xo)” +fY2 Yn)”z(X2 XI)2+
(Y2 Yl)2-(7) By performing the conversion using the method shown above, arbitrary positional coordinates of the drawing pasted on the tablet can be input into the computer.

In this embodiment, the case where there are three reference points has been described.

In principle, three points are sufficient, but in order to correct positional deviation when inputting reference points with a stylus pen, set three or more reference points and take the average value. , it is possible to completely improve the accuracy. -! Furthermore, in this embodiment, a case has been described in which the line segment 78 and the line segment 79 are perpendicular to each other, but in general, any three points forming a triangle may be set as the reference points. Even in that case, it is possible to perform coordinate transformation using the same method as in this embodiment.

〔Effect of the invention〕

According to the present invention, the following effects can be obtained when inputting the coordinate data of each building drawing on a tablet.

(1) Drawings can be pasted at any position on the tablet in both horizontal, vertical, and rotational directions.

(2) The size of the drawing can be made arbitrary. In other words, even if the drawing is enlarged or reduced and pasted on a tablet, it can be made into a ``11 manual drawing'' without changing the program. Therefore, the computer output figure The present invention is particularly effective when the target is a drawing.For example, whether the same drawing is output using an XY plotter or a hard copy of a graphic display, the same drawing can be printed regardless of the size of the drawing. Data can be entered using an input program.

Furthermore, even if the drawing is deformed due to humidity or aging, accurate coordinate data can be input.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the tablet device, FIG. 2 is an example of a drawing attached to the tablet, and FIG. 3 is an explanatory diagram of coordinate transformation. 1 is a tablet, 2 is a stylus pen, 3 is a calculator, 4
1 is a storage device, and 5 is a graphic display.

Claims (1)

[Claims] In a coordinate data input method for inputting coordinate data on a drawing into a computer using a tablet, the tablet 1. A method for inputting coordinate data of a drawing, characterized by having a function of allowing input of all coordinate data of a drawing of any size pasted at any position on the drawing.