JPH04220709A - Graphic editing device - Google Patents

Abstract

PURPOSE:To draw a precise graphic passing desired coordinates by inputting and displaying graphic data and graphic information. CONSTITUTION:This graphic editing device is provided with a graphic display means which displays the graphic, a graphic information display means which displays the graphic information, a graphic information input means for inputting the graphic information consisting of characteristics and numerals prescribing the position and shape of the graphic, and a converting means which converts the inputted figure information into the figure data. A form window 20 for graphic generation and a mathematical expression input window 30 for the graphic to be plotted are displayed on the display screen 22 of a CRT and a graphic mathematical expression generated on a keyboard, the graphic information on a definition area, etc., are inputted to the mathematical expression input window 30 to plot the precise graphic having specified segments at precise positions in the form window 20 for graphic generation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic editing apparatus, and more particularly to a graphic editing apparatus having a function of creating figures such as straight lines and circles in accordance with information input from a pointing device or a keyboard.

0002

2. Description of the Related Art Conventionally, in this type of graphic editing apparatus, a pointing device is used to
They used to specify a point and draw a straight line, or specify a center point and a point on the circumference to draw a circle.

0003

However, when graphic data is created by specifying points on a display using a pointing device, it becomes difficult to specify detailed coordinates. Furthermore, when creating a curve, it is necessary to specify points more accurately than when specifying a straight line, but there is a problem in that pointing devices are not suitable for such specification.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a figure editing device that can draw accurate figures that pass through desired coordinates.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the graphic editing device of the present invention comprises: a graphic display means for displaying a graphic; a graphic information display means for displaying graphic information;
comprising: a graphic information input means for inputting graphic information consisting of characteristics and numerical values that define the position and shape of a graphic; and a converting means for converting the graphic information designated by the graphic information input means into graphic data; It is characterized by displaying the converted graphic data and graphic information, respectively.

[0006]Furthermore, it is characterized in that the graphic displayed by the graphic display means and the graphic information displayed by the display means are displayed on the same display screen. Furthermore, the characteristics and numerical values defining the shape include a graphical mathematical formula.

As a result, according to the present invention, by inputting graphic information consisting of characteristics and numerical values that define the position and shape of a desired graphic, it is possible to draw an accurate graphic that passes through desired coordinates.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. Note that "document" in the following explanation refers to text (including tables), figures, images, etc., and figures (including lines) consisting of line diagrams.
(including curves and straight lines). Furthermore, as long as the functions of the present invention are executed, whether the device that implements the function is a single unit or a system consisting of multiple devices,
It goes without saying that the present invention is also applicable to systems in which processing is performed via a network such as a LAN.

FIG. 1 is a system block diagram of an image processing system according to an embodiment of the present invention. 1 is the system
The system bus is a system bus to which each of the component blocks described below is connected. 2 is a CP for calculation control
It is U. 3 is program memory (referred to as PMEM)
Then, the program for editing processing is installed on the appropriate hardware.
It is selected/read from the disk 14 and executed by the CPU 2. Furthermore, data input from the keyboard 8 is stored as code information in the PMEM 3, which is also a text memory. 4 is an image memory (referred to as IMEM), 5 is a print output control unit, and 6 is a printer. The print image is expanded into the IMEM 4 as bitmap data, and then output to the printer 6 under the control of the print output control section 5.

[0010] 7 is an input control unit, which includes a keyboard 8,
An input device such as a pointing device (referred to as PD) 9 such as a mouse for instructing processing of image information on the CRT 12 is connected. By operating this keyboard 8, the operator issues system operation commands and the like. This allows the cursor on the CRT 12 to be moved arbitrarily in the X and Y directions, selects a command icon on the command menu, and instructs the process.

10 is a video image memory (VRA);
11 is a display output control section, and 12 is a CRT. The data displayed on the CRT 12 is developed on the VRAM 10 as bitmap data. For example, in the case of character data, a character pattern corresponding to the code is developed on the VRAM 10, and a cursor can be directly generated and displayed in the display area of the VRAM 10 by software control. 13 is an external storage device control unit; 14;
15 is a disk for data files; for example, 14 is a hard disk (referred to as HD), and 15 is a 3.5-inch floppy disk (referred to as FD).

FIG. 2 shows a display screen 22 of the CRT 12. As shown in FIG. In the figure, numeral 20 is a graphic creation paper window for displaying, creating and editing graphic data, and 21 is graphic data of circles and polygons created on the graphic creation paper window.

FIG. 3 also shows the display screen 22 of the CRT 12, in which a graphic mathematical formula input window 30 for specifying a graphic to be drawn on the graphic creation sheet window 20 is displayed. 31 is a mathematical formula input area for inputting a mathematical formula indicating what kind of figure it is, and in the figure, it is "y=2x+1
0" is specified. 32 is the X coordinate domain input area that specifies the valid range of the figure, and in the figure "
The upper and lower limits of the X coordinate are specified as "10≦x≦100".

FIG. 4 also shows the display screen 22 of the CRT 12, in which a line segment 40 designated by the graphic mathematical expression input window 30 is displayed on the graphic creation sheet window 20.

FIG. 5 shows the diagram on the figure creation paper window 20.
Shows how the coordinate system is structured. 50 indicates the x-coordinate axis and its positive direction in the figure creation sheet 20, 51 indicates the y-coordinate axis and its positive direction in the figure creation sheet 20,
52 indicates the origin (0,0) of the coordinate axes.

FIG. 6 is a flowchart showing an example of a control procedure by the CPU 2. In step S1, a graphic creation paper window 20 is displayed on the display screen 22 of the CRT 12 as shown in FIG. At this time, it is not necessary for the graphic data 21 to exist in the graphic creation paper window 20. Then, in step S2, a predetermined position on the display screen 22 as shown in FIG.
Display the graphical mathematical formula input window 30 in the upper left corner,
In step S3, input the graphic/mathematical formula to be created using the keyboard 8, and in step S4 input the domain of the X coordinate values of the figure to be created using the keyboard 8 (the domain of the Y coordinate values may also be specified). ). Next, in step S5, the figure 40 is displayed on the figure creation sheet 20 using the mathematical formula and domain designated in steps S3 and S4, as shown in FIG.

In this embodiment, as shown in FIG. 3, the mathematical formula is "y=2x+10" and the domain is "10≦x≦1.
00", the figure 40 becomes a line segment as shown in Figure 4. Also, the coordinate system is set with the upper left corner of the figure creation form window as the origin (0,0), as shown in Figure 5. The default is that the horizontally right direction from the origin is the positive direction of the X-axis, and the vertically downward direction is the positive direction of the Y-axis, and in this example, the figure is created according to this default.Then, the figure creation paper is In this embodiment, the method of creating the line segment 40 on the window 20 is based on the domain of X "10≦x≦100.
Find the Y coordinates that correspond one-to-one to ", and use the coordinates (1
It passes through the points 0, 30), (11, 32), (12, 34), etc., and outputs an unbroken straight line that looks like an interpolation between the points.

In step S6, it is determined whether or not a graphic creation end instruction has been given from the keyboard 8. If there is no graphic creation end instruction, the process returns to step S3, and if a graphic creation end command has been given, the process is directly terminated. do.

In this way, a figure can be created simply by specifying a mathematical formula and a domain, so it is easy to draw an accurate figure at a precise position.

[0020]

[Other Embodiments] In the above embodiment, the figure mathematical expression input window 30 is displayed, and the mathematical expression of the figure to be created and its x
Figures were displayed/created by specifying the possible range of coordinate values and y-coordinate values, but in this example, the shape name and the information necessary to create the shape (for example, in the case of a circle, the center point and radius ) can now be used to create shapes.

Next, the control procedure by the CPU 2 when the figure name is circle will be explained with reference to FIG.

Step S11 is the same as in the previous embodiment, and in step S12, a graphic information input window 70 is displayed in place of the graphic mathematical expression input window 30 of the previous embodiment. When "circle" is input in the figure name input area 71 in step S13, the center point input area 72 and the radius input area 7 are input.
3 appears. Graphic information input window 70 at this time
FIG. 7 is an explanatory diagram.

[0023] Then, in step S14, the center point and radius are input, and when an input to instruct the start of figure creation is made from the keyboard 8, the figure creation paper 20 is input in step S15.
A circle is drawn on top. The coordinate system at this time is the same as in the previous embodiment. Also, the way to draw a circle, which is the shape you want to create, is internally as shown in Figure 10.
4, and by substituting the center point and radius designated in step S14 into this mathematical formula, a continuous circle is displayed on the figure creation sheet window 20 as in the previous embodiment.

In step S16, it is determined whether or not an instruction to end graphic creation has been given from the keyboard 8. If there is no instruction to end graphic creation, the process returns to step S13, and if there has been an instruction to end graphic creation, the process is directly terminated. do.

Although this embodiment has been described with reference to the case where a circle is drawn, the figure is not limited to a circle, but may be an ellipse or a polygon. FIG. 8 shows an example of a graphic information input window for creating an ellipse, where 80 is an area for inputting the major axis of the ellipse, and 81 is an area for inputting the minor axis of the ellipse.

Note that step S5 or S15 is a known straight line (curve) drawing routine that detects the interval between drawn points and interpolates the intervals to draw a continuous line so that the straight line or curve does not become a dotted line. have.

[0027]

[Effects of the Invention] As explained above, according to the present invention,
By inputting graphic information consisting of characteristics and numerical values that define the position and shape of the desired figure, it is possible to draw an accurate figure that passes through the desired coordinates.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a graphic editing device according to the present embodiment.

[Figure 2],

[Figure 3],

FIG. 4 is a diagram showing an example of display on the CRT 12.

FIG. 5 is a diagram showing an example of a coordinate system on the figure creation paper 20.

FIG. 6 is a flowchart showing an example of a control procedure by the CPU 2.

[Figure 7],

FIG. 8 is a diagram showing an example of a graphic information input window according to another embodiment.

FIG. 9 is a flowchart showing an example of a control procedure according to another embodiment.

FIG. 10 is a diagram showing how a mathematical formula for a circle is recorded in another embodiment.

[Explanation of symbols]

Claims (3)

[Claims] 1. A graphic display means for displaying a graphic; a graphic information display means for displaying graphic information; a graphic information input means for inputting graphic information consisting of characteristics and numerical values defining the position and shape of the graphic; 1. A graphic editing device comprising: converting means for converting graphic information specified by graphic information input means into graphic data; and displaying the converted graphic data and graphic information, respectively. 2. The figure editing device according to claim 1, wherein the figure displayed by the figure display means and the figure information displayed by the display means are displayed on the same display screen. 3. The graphic editing device according to claim 1, wherein the characteristics and numerical values that define the shape include a graphic mathematical formula.