JPH0456353B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention utilizes a computer to manage map information, equipment information such as gas, electric power, etc. supply networks, and perform status diagnosis. This invention relates to a graphic processing mechanism for constructing a so-called combi-uter mapping system.

(Prior Art) For example, as shown in FIG. 3, a host computer that performs graphic processing using an absolute coordinate system, a plurality of graphic display devices such as graphic displays connected to the host computer, and a graphic display device that In a conventional graphic processing mechanism having a graphic input device such as a digitizer connected to the host computer via a etc., but it is practically impossible to paste the drawing accurately in the specified position, and the drawing may be expanded or contracted or the scale may be different, so if it is left as is, the coordinate system Since the graphics are different, the graphics cannot be accurately input into the host computer and therefore cannot be displayed on the graphics display device. Therefore, it is necessary to convert the coordinate input signal from the graphic input device into the absolute coordinate system of the host computer.

A conventional graphic processing mechanism that performs the above-mentioned conversion process when inputting a graphic using a graphic input device is disclosed in, for example, Japanese Patent Laid-Open No. 101989/1989.
This graphic processing mechanism first inputs data using an entry form with a graphic entry frame, and then pastes the data into the graphic input device when inputting a graphic stored in the computer's storage area. Coordinate transformation is performed for the purpose of correcting paper misalignment. That is, this graphic processing mechanism first prints the stored graphic and the graphic entry frame in which the graphic is drawn in full size, then pastes this printed paper onto the graphic input device, and uses this printed paper as an entry form. This is used to add or delete figures, and at this time, the coordinates of the two diagonal points of the entry frame stored in the storage area and the entry frame printed on the printing paper are calculated on the printing paper. The amount of displacement and rotation is calculated, and parameters for coordinate transformation are set based on these amounts. In this way, this figure processing mechanism assumes that the figure and figure entry frame in which the figure is drawn are printed in accurate original size on the printing paper, and therefore the parameters of the coordinate transformation are set on the paper. This method only deals with the displacement and rotation of paper, and does not take into account differences in expansion and contraction of the paper at all.

(Problem to be Solved by the Invention) Since the above-mentioned figure processing mechanism does not perform any coordinate transformation due to expansion and contraction of the paper, adding or deleting a figure is always done when the memorized figure or figure is drawn. You must use printing paper with the figure entry frame printed in full size; you must not use other paper to input figures, and you cannot input figures that have been drawn in advance on other paper. I can't do it at all. Also, even if the paper is printed as described above, it is not necessarily printed at the exact original size.
Therefore, there is a problem that accurate graphic input is difficult.

In general, in a graphic processing mechanism consisting of a host computer and multiple graphic display devices and graphic input devices, the coordinate conversion described above is performed by the host computer itself using a program, so there is a limit to the conversion speed. Since the coordinates of the coordinates are sent to the graphic display device for display, it takes time from when they are input using the graphic input device until they are displayed on the graphic display device. Furthermore, as the number of graphic display devices and graphic input devices connected to a host computer increases, the speed tends to slow down. Therefore, it takes time to input and output graphic data, which is a major factor in increasing operator costs and reduces the burden of program development. There is a big problem.

The present invention aims to solve the above-mentioned conventional problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention,
A graphics processing mechanism has a host computer that performs graphics processing in an absolute coordinate system, a plurality of graphics display devices connected to the host computer, and a graphics input device connected to the host computer via the graphics display devices. A coordinate transformation device is interposed between the graphic display device and the graphic input device, and the coordinate transformation device includes a parameter setting section that sets parameters for coordinate transformation according to instructions from the host computer, and a conversion unit that calculates the coordinate signal from the input device using the parameters and converts it into absolute coordinates suitable for processing in the host computer, and the host computer , from the coordinate signals of at least one point each on the horizontal and vertical axes of the orthogonal coordinates, the intersection of these horizontal and vertical axes, and the absolute coordinates of each corresponding point, the drawing in the graphic input device is We propose a graphic processing mechanism that calculates coordinate transformation parameters corresponding to position, angle, and expansion/contraction and sets them in the parameter setting section.

(Operation) When replacing the drawing pasted on the graphic input device to input figures, at least one point each on the horizontal axis and vertical axis of the orthogonal coordinates on the newly pasted drawing on the graphic input device. The coordinates of the intersection of these horizontal and vertical axes are input into the host computer.

Then, the host computer calculates coordinate transformation parameters corresponding to the position, angle, and expansion/contraction of the drawing in the graphic input device from the coordinate signals of these points and the absolute coordinates of each point corresponding to these points. and set it in the parameter setting section.

After the parameters are set, the coordinates of the figure on the drawing inputted by the figure input device are input into the host computer after being coordinate-transformed by the converting unit based on the parameters set in the parameter setting unit.

Therefore, even if the drawing pasted on the graphic input device differs from the drawing in the host computer's absolute coordinate system in terms of position, angle, and expansion/contraction, the drawing can be edited without the need for coordinate conversion processing on the host computer. As the input is made, the input graphic is quickly displayed on the graphic display device.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

In Figure 1, the symbols are host computer,
Reference numeral 2 indicates one of a plurality of graphic display devices connected to the host computer, and 3 indicates a graphic input/input device connected to the host computer 1 via the graphic display device.

A host computer 1 controls the entire system including a plurality of graphic display devices 2 and a graphic input device 3, and also registers, updates, searches, and analyzes figures such as drawings in a predetermined absolute coordinate system. It also performs processing. The graphic display device 2 displays information such as graphics and characters in a predetermined format based on the output from the host computer 1 and the like. still,
Reference numeral 4 indicates a control unit including a control unit for a display such as a CRT and an interface unit, and other appropriate input/output devices are configured as necessary.

In the above configuration, a coordinate conversion device 6 is interposed between the graphic display device 2 and the graphic input device 3, and parameters for coordinate conversion are input to the coordinate conversion device 6 according to instructions from the host computer 1. A parameter setting section 7 is provided to set the parameters, and a conversion section 8 is provided that calculates the coordinate signals from the graphic input device 3 using the parameters and converts them into an absolute coordinate system compatible with the above processing in the host computer 1. . The conversion unit 8 includes a numerical calculation processor and
It can be easily configured to use a CPU or the like to perform coordinate transformation calculations, which will be described later, at high speed. Reference numerals 9, 9', and 9'' indicate the host computer 1,
Graphic display device 2, graphic input device 3, and conversion unit 8
and an appropriate communication means for communicating data with the parameter setting section 7. In the embodiment, data communication between the coordinate conversion device 6 and the host computer 1 is made possible through both a path 10 via the interface section of the graphic display device 2 and a direct path 11. , the operations described below are performed, but it is also possible to perform data communication only through route 10.

In the above configuration, when inputting the figure 13 drawn on the drawing 12, the drawing is first pasted onto the figure input device 3 and inputted using a cursor or the like. Since it is practically impossible to paste the figure 13 accurately in a predetermined position, and the drawing 12 may be expanded or contracted or have a different scale, it is necessary to input the figure 13 accurately into the host computer 1 in the absolute coordinate system. Nor can it be displayed on the graphic display device 2.

Therefore, in the present invention, first, at least three points are preset on the drawing 12, that is, points P ₁ and P ₂ each on the horizontal and vertical axes of the orthogonal coordinates, and the intersection of these horizontal and vertical axes, for example, the orthogonal coordinates. Input the origin P ₀ or point P ₃ of , using a cursor etc., and select those points P ₀ , P ₁ ,
The coordinates (X ₀ , Y ₀ ), (X ₁ , Y ₁ ), and (X ₂ , Y ₂ ) of P ₂ are input from the coordinate conversion device 6 to the host computer 1 via a path. In addition, from the keyboard etc., parameters for specifying where the three input points are in absolute coordinates, i.e., l _x , l _y ,
Input X ₀ ′ and Y ₀ ′. Note that O in the figure indicates the origin on the graphic display device 2.

Then, the host computer 1 calculates coordinate transformation parameters corresponding to the position, angle, and expansion/contraction of the drawing in the graphic input device 3 from the coordinate signals of these points and the absolute coordinates corresponding to these points. Therefore, this parameter will be explained below.

First, coordinate transformation between the coordinates (X, Y) of an arbitrary point P of the figure 13 drawn on the drawing and its absolute coordinates (X', Y') can be expressed as in the following equation.

X′ Y′＝Sx O O Sycosθ Sinθ −sinθ cosθX−X ₀ Y−Y ₀ +X ₀ ′ Y ₀ ′ …(1) However, Sx and Sy indicate the expansion/contraction ratio in the horizontal and vertical directions, respectively. , between two points in the figure, that is, between P ₀ and P ₁ ,
Letting the actual lengths between P ₀ and _{P 2} be lx and ly, respectively, they are calculated by the following formula.

Sx=lx/√( ₁ − ₀ ) ² +( ₁ − ₀ ) ² Sy=ly/√( ₂ − ₀ ) ² +( ₂ − ₀ ) ^2Also , θ is relative to the horizontal axis of the graphic display device 2. This is the inclination angle of the horizontal axis of the drawing, and is calculated by the following formula.

θ=tan ^-1 ((Y ₁ - Y ₀ )/(X ₁ - X ₀ )) As described above, the coordinates of at least the three points,
By inputting parameters for defining where the three input points are in absolute coordinates and, if necessary, an expansion/contraction ratio such as scale, the coordinate transformation described above can be performed.

By the way, equation (1) can be rearranged as follows.

X′ Y′=a b c dX Y+e f…(2) However, a=Sx cosθ b=Sx sinθ c=−Sy sinθ d=Sy cosθ e=−Sx X ₀ cosθ−Sx Y ₀ sinθ+X ₀ ′ f= _{Sy _ _} If you leave it (2)
It can be seen that the coordinate transformation of equation (1) can be easily performed using the equation.

Therefore, after calculating the above parameters using its own program, the host computer 1 sets these values in the parameter setting unit 7 of the coordinate conversion device 6 by a command via the path 11.

After the parameters are set in the setting unit 7 as described above, the coordinates of any point input using a cursor or the like on the same drawing are calculated using equation (2) in the conversion unit 8 of the coordinate conversion device 6. The coordinates are converted into absolute coordinate system coordinates by calculation. The converted coordinates are then sent to the host computer 1 via a path 10 and an interface section of the control section 4 for processing.

Since the coordinates sent from the coordinate conversion device 6 to the host computer 1 are coordinates in the absolute coordinate system, they can be directly processed in the control unit 4 and displayed on a CRT or the like.

In this way, although the host computer 1 side calculates the parameters for the coordinate transformation, it does not perform the coordinate transformation itself, and since no command from the host computer 1 is required to display the input figure 13, the figure input device 3, the time from specifying an arbitrary point on the drawing 12 with a cursor etc. to displaying it on the graphic display device 2 can be significantly shortened. You can perform interactive graphic input.

In this way, in the present invention, by performing the above operations every time the drawing 12 is replaced, the figure 3 can be accurately input to the host computer 1 in the absolute coordinate system even if the position, angle, and expansion/contraction ratio of the drawing 12 are different. can and quickly display graphic display device 2
By being able to display the image in , it is possible to perform efficient interactive graphic input.

(Effects of the Invention) As described above, the present invention includes a host computer that performs graphic processing in an absolute coordinate system, a plurality of graphic display devices connected to the host computer,
In a graphic processing mechanism having a graphic input device connected to the host computer via the graphic display device, a drawing pasted on the graphic input device is displayed in absolute coordinates of the host computer in terms of position, angle, and expansion/contraction. Even if the figure differs from the drawing in the system, the figure can be input without requiring coordinate conversion processing in the host computer, and the input figure can be quickly displayed on the figure display device. Therefore, according to the present invention, the operator can efficiently perform interactive graphic input without wasting waiting time, reducing operator costs and reducing the burden of program development.

[Brief explanation of the drawing]

FIG. 1 is a schematic system explanatory diagram of the configuration corresponding to the embodiment of the present invention, FIG. 2 is a schematic explanatory diagram showing the state of the drawing on the graphic input device, and FIG. 3 is a schematic diagram of the configuration of the conventional example. It is a system explanatory diagram. Symbol 1...Host computer, 2...Graphic display device, 3...Graphic input device, 4...Control unit, 5...CRT,
6... Coordinate conversion device, 7... Parameter setting section, 8...
Conversion unit, 9, 9', 9''...data communication means, 10,
11...route, 12...drawing, 13...figure.

Claims (1)

[Claims] 1. A graphic processing mechanism having a host computer that performs graphic processing in an absolute coordinate system, a plurality of graphic display devices connected to the host computer, and a graphic input device connected to the host computer via the graphic display device. A coordinate transformation device is interposed between the graphic display device and the graphic input device, and the coordinate transformation device includes a parameter setting section that sets parameters for coordinate transformation according to instructions from the host computer; a conversion unit that calculates coordinate signals from the graphic input device using the parameters and converts them into absolute coordinates suitable for processing in the host computer, the host computer From the coordinate signals of at least one point each on the horizontal and vertical axes of the orthogonal coordinates, the intersection of these horizontal and vertical axes, and the absolute coordinates of each point corresponding to these,
A graphic processing mechanism, characterized in that parameters for coordinate transformation corresponding to the position, angle, and expansion/contraction of a drawing in a graphic input device are calculated and set in the parameter setting section.