JPH01320579A - Graphic processing mechanism - Google Patents

Abstract

PURPOSE:To promptly and efficiently input real coordinates without imposing a burden to a host computer by providing a parameter holding means to a terminal, and holding the inclination of a drawing and the parameter of distortion correction on a graphic input device. CONSTITUTION:Based on coordinates (x11,y11), (x12,y12), (x13,y13) and (x14,y14) of respective apexes P11 to P14 of a rectangular frame B on a drawing 7 paper inputted from a graphic input device 4, a host computer 1 calculates the respec tive parameters. After the parameters are held in a parameter holding means 6, the parameters are used whenever the coordinates (x1,y1) of an arbitrarily point on a drawing 7 are inputted. By using a prescribed arithmetic expression in a coordinate transforming arithmetic means 5, a coordinate transforming operation in executed, and the inclination and distortion of the drawing 7 are corrected. Thus, the real data can be inputted to the host computer 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is for managing map information, equipment information such as gas, electricity, etc. supply networks, and diagnosing conditions using a computer. This invention relates to a graphic processing mechanism for constructing a so-called computer mapping system.

[Conventional technology and its problems]

For example, as shown in FIG. 4, there is a host computer a that performs graphic processing in an absolute coordinate system;
A conventional graphic processing mechanism has a plurality of graphic display devices gb such as graphic displays connected to a computer, and a graphic input device C such as a digitizer connected to the host computer a via the graphic display devices gb. The process of converting the coordinate signal input from the graphic input device 1C into the absolute coordinate system of the host computer a is performed by the host computer a itself using a program, and the converted coordinates are sent to the graphic display device ab for display. .

Therefore, there is a limit to the conversion speed, and the graphic display device Wtb and the graphic input device [C,
As the number of coordinates increases, the processing time tends to become slower, and after these coordinate transformations are performed, they are displayed on the graphic display device [b] according to commands from the host computer a, so it takes time to input and output graphic data, increasing operator costs. In addition to being a major factor, there is also the problem of the burden of program development.

Also, as shown in Figure 5, each graphic display device and graphic input device! There is a system in which a coordinate conversion device d is interposed between f0, and the inclination of the drawing e on the graphic input device iC is performed not by the host computer a but by the coordinate conversion device d (for example, see Japanese Patent Laid-Open No. 62-278679). ). Such a coordinate transformation device [d is provided with a coordinate transformation calculation means f and a parameter holding means q for the calculation, and the parameters are calculated by the host computer a and set via the route. There is.

However, drawings created on materials such as paper are usually distorted due to expansion and contraction, so even if only the inclination of the drawing is corrected, it is difficult to input true data, and Errors will occur, and in the configuration described above, if one set of graphic display devices is used, two ports for the terminals of the host computer a will be used for the graphic input device 1c, which poses an economical problem.

The present invention aims to solve the above problems.

[Means for solving problems]

The structure of the present invention will be explained based on the drawings corresponding to the embodiments. First, the mechanism described in claim 1 is: 2. A host computer that performs graphic processing in an absolute coordinate system. 1, a terminal graphic processing device @3 connected to the host computer 1 and each equipped with a graphic display means 2, and a graphic input device for inputting graphics to the host computer 1 via the vA terminal graphic processing device 3! ! 4, and the terminal graphic processing ¥1i13 includes a coordinate conversion calculating means 5 that calculates the coordinate signal from the graphic input device 4 using predetermined parameters and converts it into absolute coordinates, and a coordinate conversion calculation means 5 that stores the parameters. The parameter holding means 6 holds parameters for correcting the tilt and distortion of the drawing 7 on the graphic input device 4.

Next, in the mechanism described in Item 2, in the mechanism described in Item 1, the parameters include the coordinates of each vertex of the rectangular frame 8 or the virtual rectangular frame on the drawing paper mounted on the graphic input device 4, A rectangular frame 9 corresponding to the absolute coordinate system in the host computer 1
It is calculated in accordance with the calculation for converting into each coordinate.

Next, in the mechanism described in item 3, in the graphic processing mechanism described in item 2, the parameter is the side of either the rectangular frame 8 or the virtual rectangular frame on the drawing paper mounted on the graphic input device faJ. , a first parameter group corresponding to the calculation to match the first side 11 with the reference line 10, and the angle between the first side J11 and the second side 12 adjacent thereto is a right angle, and the angle between them is set as a right angle. a second parameter group corresponding to an operation for making the length of a side into a unit length;
A third parameter group corresponding to the calculation to match the coordinates of the apex where the third side A3 and the fourth side 14 intersect with the apex of the square 10 of unit length, and the expansion of the square 10 normalized in this way. It has a fourth parameter group corresponding to the calculation to match the corresponding rectangular frame 9 of the absolute coordinate system, and holds these parameter groups in the parameter holding means 6, and coordinate transformation calculation means 5. The configuration is such that the above calculation is performed using these parameter groups for each quintillion coordinates input from the graphic input device 4.

[Function and Examples]

Next, the operation of the present invention will be explained with reference to examples. In FIG. 1, reference numeral 1 indicates a host computer, and 3 indicates one of a plurality of terminal graphic processing devices connected to the host computer 1. This terminal graphic processing device 3 is equipped with a graphic display means 2. ing. A graphic input device 4 such as a digitizer is connected to this terminal graphic processing bag W3, and this graphic input device 4 inputs graphics to the host 1-computer 1 via the terminal graphic processing device 3. The host computer 1 is
In addition to controlling the entire system, it also registers, updates, searches, analyzes, etc. figures such as drawings in a predetermined absolute coordinate system. Further, the terminal graphic processing device 3-2 receives the PJf! from the graphic input device 4! A coordinate conversion calculating means 5 for calculating using the parameters of the target signal sound signal and converting it into absolute coordinates suitable for the display host 1, and a holding means 6 for the parameters are provided, and these are graphic display means. 2 and is controlled by the control means 11. and control means 11
In addition to these controls, it also functions as an interface section between the computer 1 and the graphic input device 4.

Therefore, - set of terminal graphic processing device 3 and graphic input device 4
In contrast, the terminal port P of the host computer 1 is 1
It only has one exclusive use.

In the above configuration, when inputting the figure 12 drawn on the drawing 7 (the second step is to first paste the drawing 7 on the figure input device 4 and input it using a cursor etc.) It is practically impossible to accurately attach Drawing 7 to a predetermined position without tilting it, and Drawing 7 is distorted due to expansion and contraction in each direction, as shown in an exaggerated manner in Figure 2. As is always the case, the figure 12 cannot be accurately input into the host computer 1 as it is.

Therefore, in the present invention, first, each vertex P1t, P+2 . .

Input Pu3 and Pe4 using the cursor, etc., and select the points P+t, P+z, Pt3 . Coordinates of Pt4 (X
n.

yll), (X12.Vt2 >, (X13.'+/1
3).

(xt4.Vt4) is input to the host computer 1 via the control means 11. Note that the rectangular frame 8 is a straight line frame or the like actually drawn on the edge itself or near the edge of the paper, and the virtual rectangular frame is a rectangular frame that is drawn on the paper only at each vertex or in the vicinity of each vertex. This shows a virtual frame.

Based on the input coordinates of each vertex, the host computer 1 converts these coordinates into a rectangular frame 9 corresponding to the absolute coordinate system.
In other words, in response to the calculation to convert to each coordinate of a rectangular frame when the drawing 7 is not tilted or expanded/contracted, parameters for correcting the inclination and expansion/contraction of the drawing 7 are calculated, and the calculated parameters are applied to the terminal figure. Output to processing bag w, 3. These parameters are held in the variable make holding means 6 via the control means 11 in the terminal graphic processing device 3, and are subjected to coordinate transformation calculation by the coordinate transformation calculation means 5.

Therefore, the above calculations and parameters will be explained.

First, in order to correct the inclination of the rectangular frame 8 on the drawing paper 7,
A computation to make the first side 11 of the rectangular frame 8 coincide with the reference line j2o, that is, a first computation expressed by the following equation is performed.

However, (X+, y+) is the coordinate (X
2, V2) are the coordinates of the point P1 of the correction violation, that is, the point P2, and θ is the coordinate of the point P2 where the first side 11 is the reference line I! It is the angle formed with o and is calculated using the following formula.

By calculating the above formula (1), from the input coordinates (X+, Vt) of an arbitrary point P1 in drawing 7,
Coordinates (X2,
V2), and such a conversion operation is equivalent to C
This can be done using OSθ and sinθ as parameters. Note that this calculation corresponds to the transition from (a) to (b) in FIG.

Next, in order to correct the distortion of the rectangular frame 8;
The angle between the side (1) and the adjacent second side (2) is made a right angle, and the length of these sides is made into a unit length of 1, i.e., the second operation expressed by the following formula is performed. .

However, A= (V22-'/21)/Δ B=-1 (X22-X21)/Δ C= (V 2a -1/z1)/ΔD-
(X24-X21)/Δ Δ-(X24-X21) @ (V22-')'21
)-(')'24-"!l'21) Φ (X22-
X21) The calculation of equation (2) is A, B, C, D,
This can be done using 21 and y21 as parameters.

Note that this calculation corresponds to the transition from (b) to (C) in FIG.

Next, the vertex P33 where the third side 13 and the fourth side 14 intersect
A calculation is performed to match the coordinates of .

5=2X3/(1+a+4;)t=2'')'3/(1a+A/i))
,,, (3) a=V3・Δx3−X3φΔy3 b−(1+a)2+4・X3・Δy3 However, ΔX3−X33−1 Δy3 = ')/33−1 The calculation of equation (3) is as follows: Δx3 and Δy3 can be done as a parameter. Note that this calculation corresponds to the transition from (C) to (d) in FIG.

Next, the square 10 normalized by the above equation (3) is expanded to the corresponding rectangular frame 9 in the absolute coordinate system, that is, the original drawing size.
Perform the calculation.

However, E; X21-X22 F = X24- Note that this calculation is performed as shown in (d) in Figure 3.
) to (e).

By sequentially performing the calculations of equations (2), (3), and (4) above, the distortion in drawing 7 can be calculated from the coordinates (X2, V2) of the corresponding point P2 whose slope has been corrected by the calculation of equation (1). It can be converted into the corrected coordinates (x4.ya) of the corresponding point P4.

As mentioned above, each vertex P++ of the rectangular frame 8 on the sheet of drawing 7 inputted from the graphic human input device 4,
PI2. PI3. Coordinates of P+a (Xn, “ilo
).

(X12.'T'+2), (X13.Vt3), (X
1a, Vt4), the host combi coater 1 calculates each of the above-mentioned parameters, and then stores this in the parameter holding means 6, and then inputs the coordinates (Xl, Yl) of an arbitrary point P1 on the drawing 7. By performing the coordinate transformation calculation described above in the coordinate transformation calculation means 5 using these parameters each time, the true data with the tilt and distortion of the drawing 7 corrected can be input to the host computer 1. be.

〔Effect of the invention〕

As described above, the present invention provides a host computer that performs graphic processing in an absolute coordinate system, a terminal graphic processing device connected to the host computer and each equipped with a graphic display means, and a terminal graphic processing device connected to the host computer that connects the host computer to a graphics human input device for inputting graphics, and the terminal graphics processing device includes coordinate conversion calculation means for calculating coordinate signals from the graphics input device using predetermined parameters and converting them into absolute coordinates; and the parameter holding means holds parameters for correcting the inclination and distortion of the drawing on the graphic input device, so that the inclination and distortion of the drawing on the graphic input device are corrected. True coordinates can be entered quickly and efficiently without putting a burden on the host computer, and the terminal board of the host computer required for one set of terminal graphics processing device and graphics input device is Since it is single, it has the effect that the entire system can be constructed economically.

[Brief explanation of the drawing]

Figures 1 to 3 are for explaining the present invention.
The figure is a system explanatory diagram of the overall configuration, Fig. 2 is an explanatory diagram of the drawing on the graphical human power device, and Fig. 3 (a), (b), (c), (
d) and (e) are diagrams explaining the transition of coordinate transformation, Figures 4 and 5.
The figure is an explanatory diagram of the configuration of a conventional example. Reference numeral 1: Host computer, 2: Graphic display means, 3: Terminal graphic processing '5A@, 4: Graphic input device, 5: Coordinate transformation calculation means, 6: Parameter holding Means, 7... Drawing, 8.9... Rectangular frame, 10.
... square, 11 ... control means, 12 ... figure. 1. -1-m: 14th figure 2

Claims (3)

[Claims] (1) A host computer that performs graphic processing in an absolute coordinate system, a terminal graphic processing device connected to the host computer and each equipped with a graphic display means, and a graphic input to the host computer via the terminal graphic processing device. The terminal graphic processing device includes a coordinate conversion calculation means for calculating coordinate signals from the graphic input device using predetermined parameters and converting them into absolute coordinates, and a coordinate conversion calculation means for storing the parameters. A graphic processing mechanism, characterized in that the parameter holding means holds parameters for correcting the skew and distortion of the drawing on the graphic input device. (2) In the graphic processing mechanism described in paragraph 1, the parameters are the coordinates of each vertex of a rectangular frame or a virtual rectangular frame on a drawing sheet attached to a graphic input device in an absolute coordinate system in a host computer. A graphic processing mechanism characterized in that calculation is performed by converting into each coordinate of a rectangular frame corresponding to. (3) In the graphic processing mechanism described in paragraph 2, the parameter is one of the sides of the rectangular frame or the virtual rectangular frame on the drawing paper mounted on the graphic input device, and the first side is aligned with the reference line. The first parameter group corresponds to an operation to make the first side and the second side adjacent to it a right angle, and corresponds to an operation to make the lengths of those sides unit length. A second parameter group, a third parameter group corresponding to the operation of matching the coordinates of the vertex where the third side and the fourth side intersect with the apex of the square of unit length, and the normalized in this way. It has a fourth parameter group corresponding to an operation of expanding a square to match a corresponding rectangular frame of an absolute coordinate system, and retains these parameter groups in a parameter holding means,
A graphic processing mechanism characterized in that the coordinate transformation calculation means is configured to perform the calculation using a group of parameters for the coordinates of each point inputted from the graphic input device.