JPS63196987A - Graphic processor - Google Patents

Abstract

PURPOSE:To artificially prevent a collapse of a reduced graphic image by a simple control, and to hold an output appearance quality by providing a border line correcting means re-drawing a picture by the corresponding pattern in accordance with an inclination angle of a border line of a graphic image. CONSTITUTION:At the time of bringing a border line graphic to painted-out and reduced picture drawing on a dot plane of an image memory 5 by reduced picture drawing of a border line and painting-out of the inside of the border line, first of all, a contour is brought to reduced picture drawing on the dot plane by a sequence of points for approximating a straight line and a curve in accordance with a coordinate value of a given border line. In this case, to a dot plane A, a border line of a contour whose picture drawing direction if 0 deg.<=phi<180 deg. is brought to reduced picture drawing by a dot pattern, and to a dot plane B, a border line whose picture drawing direction is 180 deg.<=phi<360 deg. is brought to picture drawing by a dot pattern C. Subsequently, to the dot plane, a border line of a graphic is brought to picture drawing, and a painting- out processing is executed. Next, to the dot plane B, A is added by OR, and to the dot plane C, B is added by exclusive OR, and a graphic which is corrected a contour is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a graphic processing device, and in particular, to shape error correction when filling and developing a graphic image to which contour information is given (hereinafter referred to as a contour image). It is.

[Conventional technology]

When outputting to a display device etc. in a conventional graphic processing device,
The outline image is reduced and drawn on the dot plane of the image memory, but the outline coordinate values given as real values are simply reduced and converted to integer coordinate values according to the precision on the dot plane. was.

[Problem to be solved by the invention] For this reason, when a graphic image such as that shown in FIG. This has been a problem as the graphic image may become distorted.

[Means for Solving the Problems (and Effects)] According to the present invention, there is provided a contour coordinate value input means for inputting an outline of an arbitrary figure, and a means for inputting a figure outline on a dot plane of a storage means according to the coordinate values. The figure processing device is constituted by a reduction drawing means for drawing a reduced drawing, a figure filling means for filling in the inside of the figure outline, and an outline correction means for redrawing the outline in a pattern corresponding to its inclination angle, This is designed to artificially prevent collapse of the reduced graphic image.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the configuration of a graphic processing device according to the present invention.
2 is a main control unit MPU which controls the entire graphic processing apparatus, and performs contour line correction processing according to the flowchart of FIG. 2, which will be described later. An external storage device such as a floppy disk (FD) or a hard disk (HD) is connected to this MPUI. Reference numeral 2 denotes a ROM (Read Only Memory) in which various control programs of the MPU described above and an outline correction processing program shown in FIG. 2 are stored.
), and 3 is a RAM that temporarily stores character data input from the outside via pass line 4 and other various data.
(Random AccessMemor
y ), and 5 is an image memory (
IMEM), and it is possible to develop dot planes, which will be described later, on the RAM 3 and IMEM 5. A video memory (VRAM) 6 develops data to be displayed on the CRT display section 7 on a bitmap. For example, if it is character data, the characters corresponding to the code are developed on VRAM, and the MPUI
It is possible to directly generate and display a cursor in the display area of the VRAM 6 under the control of. 8 is BMU (Bit M
animation unit), RAM3.
IMEM5. DMA (D
direct Memory Access) function. 9 is a printer, IO is an interface for connecting the printer 9 and the pass line 4, and 11 is a keyboard through which various data and commands can be input.

Next, the outline correction process of the graphic processing apparatus configured as described above will be explained.

When a contour figure as shown in FIG. 3 is drawn on a dot plane of the image memory by reducing the outline and filling in the inside of the outline, the figure is drawn in a reduced size according to the algorithm shown in FIG. 2. First, the outline is reduced and drawn on the dot plane using a series of points that approximate straight lines and curves according to the coordinate values of the given outline, but the drawing direction on dot plane A is 00≦φ<180° (here α is the initial Steps Sl, S2. S3) On dot plane B, a contour line with a drawing direction of 180°≦φ<360° is drawn using the dot pattern shown in Fig. 8 (step 31. S2. 34), so that dot plane A becomes as shown in Fig. 5. In addition, the dot plane B is made as shown in FIG. Next, the outline of the figure is drawn on the dot plane C and a filling process is performed on the dot plane C (steps S5, S6, S7).
Figure 4 is obtained. Next, dot plane A is logically added to dot plane B (step S8) to obtain FIG. Next, dot plane B is added to dot plane C of the filled-in figure by an exclusive OR operation (step S9) to obtain FIG. 1O with its contour corrected. According to this reduced graphic image, the conventionally crushed portions are output in a pattern as shown in FIG. 8, so that they do not look crushed.

Here, since the graphic image reduction processing and filling processing are conventionally well known, the details thereof will be omitted here.

Further, as the dot patterns shown in FIGS. 7 and 8, an appropriate pattern can be used depending on the resolution of the output device, the thickness of the output points, etc. Furthermore, a process may be performed in which an appropriate broken line pattern is used to overdraw an outline on the once filled-in graphic image.

Also, the angle specification for pattern switching based on the drawing direction is 2.
Type (0≦φ<180', 180°≦φ<360
It goes without saying that it can be freely set, not limited to °).

〔Effect of the invention〕

As described above, the present invention is a graphic processing device having a contour line correction means that redraws a pattern corresponding to the inclination angle of the contour line of a graphic image, so that it is possible to maintain the output quality of a reduced graphic image with simple control. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the graphic processing device of the present invention, FIG. 2 is a flowchart showing the contour correction processing algorithm, FIG. 3 is a diagram showing an example of a contour image to be corrected, and FIG. 4 is an example of a figure image to be corrected; Figure 5 is a diagram showing a contour line drawn using the pattern in Figure 7; Figure 6 is a diagram showing a contour line drawn using a pattern in Figure 8; Figure 7 is a diagram showing a contour line. FIG. 8 is a diagram showing an example of a line correction pattern, FIG. 9 is a diagram showing a corrected contour image, and FIG. 1O is a figure image with contours corrected. Figure, 11th
Figures (a) and (b) are diagrams for explaining conventional reduced figure drawing. 1 ・・・・・・・・・・・・・・・・・・・・・・・・
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Claims (1)

[Claims] a contour coordinate value input means for providing an outline of a figure image; a reduction drawing means for reducing and drawing the figure outline on a dot plane of a storage means according to the coordinate values; a figure filling means for filling the inside of the figure outline; A graphic processing device comprising a contour line correction means for redrawing the contour line in a pattern corresponding to its inclination angle.