JPS62251980A - Grid display system - Google Patents

Abstract

PURPOSE:To execute complicated graphic processing by simple operation by setting and changing grid spacing and inclination arbitrarily according to object of drawing of a graphic. CONSTITUTION:When a command for grid display indication is received from a command inputting device 11, a grid display controlling section 12 sets display position of the grid anew, and rewrites a frame memory 13. That is, the controlling section 12 inputs grid spacing of X axis, grid spacing of Y axis and angle of inclination of X axis, and then inputs an angle made by X axis and Y axis. Then, the section detects areal information such as position of display, size, original point coordinate position in the area of an objective area in which the grid is to be displayed from an area control table. Then, starting point and end point coordinates of a segment strings constituting the direction of X axis and the direction of Y axis are calculated from the input data and areal information. Next, the grid is displayed in the area by respective segment string. By above-mentioned method, setting and changing of grid become easy, and complicated graphic processing is made possible by simple operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of displaying a grid as a drawing aid in a graphic processing system capable of drawing and displaying figures, and particularly relates to a method for displaying a grid as a drawing aid, especially for tilted figures and perspective draw shapes or
The present invention relates to a grid display method suitable for transforming figures.

[Conventional technology]

With the advent of personal computers and workstations equipped with graphic processing functions, it has become possible to draw figures interactively on a display screen using a pointing device such as a mouse or digitizer. Some of them support simple two-dimensional figures, while others can handle three-dimensional figures.When drawing or editing figures in 0 figure processing, it is similar to how humans draw figures using graph paper. Similarly, many of the grids displayed in systems that support graphic processing, which have the function of displaying a grid called a grid on the display screen as a drawing aid, use dots, broken lines, etc. in a vertical and horizontal grid pattern. , displayed at a fixed pitch. Also, the grid has
There is a rounding function to correct inaccurate coordinate values entered with a mouse, etc. 6 [Problems to be solved by the invention] In the conventional grid display method, figures consisting of vertical/horizontal lines, etc. This is effective when drawing a figure that is , or when aligning already drawn figures to the grid. However, when drawing a tilted figure or a three-dimensional perspective figure, or when drawing a tilted figure for which the grid cannot be used as an aid, first draw an erect country shape.
This can be realized by rotating it by an arbitrary angle, or by giving a tilt angle as a parameter and drawing it. In the case of the above method, it is not necessarily possible to draw at the desired position, and position adjustment by dragging or the like is required.

Furthermore, it is difficult to draw three-dimensional perspective figures directly on a two-dimensional screen.

As mentioned above, the function of the grid cannot be used effectively in graphic processing, and the operability is not good even when drawing graphics.

An object of the present invention is to provide easy graphic drawing processing and improve operability by improving the drawbacks mentioned above and effectively utilizing the functions of the grid.

[Means for solving problems]

In order to achieve the above object, the present invention is achieved by making it possible to arbitrarily set and change the grid spacing and inclination depending on the purpose of drawing one figure.

[Effect]

As described above, according to the configuration of the present invention, a grid having an arbitrary direction can be displayed in an arbitrary section of the screen J2, and it is easy to set or change the grid according to the axis of a pre-given figure, etc. Therefore, complex graphical processing becomes possible with simple operations.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention,
FIG. 2 is a flowchart for explaining the operation of the grid display control section 12 in FIG.

In FIG. 1, 11 is a command input device. 1.
When the grid display control section 2 receives a grid display instruction command from the command input device 11, it newly sets the display position of the grid so as to display it within a designated area on the display screen.

The frame memory 13 is rewritten based on the set position.

14 is a display device for displaying the results.

Next, based on the flowchart of FIG.

The operation of the grid display control section shown in the figure will be explained. First, process 2
1, input the X-axis grid spacing d8. In step 22, the Y-axis grid spacing d is input. In step 23, the OK inclination angle of the X axis is input. In process 24, the angle θ between the X axis and the Y axis
Enter xy. At this time, θ8. θIF is within the following range.

0(Ox-Oxy<L80' In addition, d,, d, is related to the resolution of the display, so it should be equal to or larger than the minimum unit that can be handled by the system.

Next, in process 25, the display position (,,y), size w, h) of the target area where the grid should be displayed is determined from the area management table that manages the area display position, size, origin coordinate position within the area, etc. , area information such as the origin coordinate position (o, oy) within the area is detected. Input data d X T d y H
Ot 1 0xy, area information *H1gWHh, Ox,
Oy, in process 26, the starting point (s*+tllyt) and the ending point (
e□p e yi) (1” 1 v 2 +...
n] Similar to calculating the coordinates, in process 27, the starting point (AxJ+ 5ya
) End point (0□+eyt) (J=L+2,...
・m) Calculate the coordinates. A grid is displayed within the area using T, X, and LY. In addition, the command value (X
p.

yp) is a set of intersection coordinates of LX, D, and Y, Pk
CPxk, Pyk) (k = 1., 2, -Q
)from.

1 XF P Xb l≦-d.

The coordinate Pb (Pxb, Pyk) that satisfies the condition 1yp-Pyhl≦-dz is set as the correction value.

A specific example is shown next. Figure 3 shows 0°=O'', Dxv=9
This is an example of displaying a conventional grid.

For example, if you want to draw a triangle as shown in Figure 3, and then draw a rectangle where one hypotenuse of the triangle is parallel to one side of the rectangle, and the distance is @d, you can draw directly in the display state of Figure 3. is a quake. By performing the above processing, the grid is displayed tilted to match the hypotenuse of the triangle. In other words, by setting Ox to be the same as the slope of the triangle's hypotenuse, and changing and displaying the grid based on the triangle's hypotenuse,
A rectangle can be drawn in the shape shown in Figure 4.

Figure 4 shows an example of rotating the conventional grid.
Next, if you want to draw a figure like the one shown in Figure 5 (a), which shows an example of Oxy≠90°, you can easily draw it by displaying a grid as shown in Figure 5 (b). Can be done.

Furthermore, in this embodiment, since grids can be displayed in units of areas, by dividing the display screen into units of areas as shown in FIG. 6, different grids can be displayed depending on the purpose of drawing within the area.

In this embodiment, an example was shown in which the grid spacing of the X-axis and Y-axis is fixed, but the inclination angle of xm is 08. Angle OX between the X and Y axes
By changing j, it is possible to display a grid that is effective for drawing a three-dimensional perspective view, as shown in FIG.

As described above, according to this embodiment, it is possible to display an effective grid that matches the drawing purpose.

〔Effect of the invention〕

According to the present invention, it is possible to draw figures that are difficult to draw only with figure editing functions such as rotation, enlargement, reduction, etc. and figure drawing functions, and it is also possible to effectively utilize the grid function as a drawing aid. It has an effect on operability.

Further, by linking the present invention with editing of already drawn figures, figure transformation becomes possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart showing the operation procedure of the grid display control unit, FIG. 3 is an example of a conventional grid display method, and FIG.
Figure 5 shows an example of drawing a figure by applying the present invention, and Figure 6 shows an example of drawing a figure by applying the present invention.
The figure shows an example in which the present invention is applied to multiple areas, and FIG. 7 shows an example in which a variation of the present invention is applied. DESCRIPTION OF SYMBOLS 1... Display screen, 2... Grid, 3... Drawing figure, 4... Area, 11... Command input device, 12
...Grid display control unit, 13...Frame memory, 14...Table Z Z Figure fJ 1 Figure Z 3 Figure 4 B Figure 5 π End ■7 Figure

Claims (1)

[Claims] 1. A grid display method for displaying a grid as a drawing aid in graphic processing, which is characterized by the ability to arbitrarily set and change the lattice spacing and inclination of the grid, and the ability to display a plurality of grids on the screen.