JPS62144197A - System of drawing segment on color display screen - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] The present invention relates to a line segment drawing method for displaying graphics in color using a plurality of bitmap planes in a workstation that executes graphics processing.

Conventionally, the line segment drawing method on this type of color display screen is to specify the position, difference value, direction, and length of the starting point and end point of the line segment drawing, and at the same time specify a color for each point sequence that occurs. Ta. Therefore, it has the disadvantage of being slow in displaying line segments in color.

In the present invention, after drawing a basic line segment using a color register that specifies a bitmap plane, other color registers are drawn in accordance with the contents of a line pattern register that stores a bit pattern that indicates the shape of the line. A line segment drawing method is provided that draws a line segment with a new color and a new line pattern by specifying a color specification pattern. Through this operation, the present invention can generate line segments displayed in various colors without having to specify a color for each dot, and line segments with arbitrary colors and styles can be created by combining monochrome line segments. This configuration has the effect of allowing color display line segments to be drawn at high speed.

[Industrial application field]

The present invention relates to a line segment drawing method on a color display screen for drawing line segments in color on a display screen in a workstation that executes graphic processing, and in particular, the present invention relates to a method for drawing line segments on a color display screen in a workstation that executes graphic processing. This invention relates to a line segment drawing method on a color display screen formed from monochrome line segments.

[Traditional technique]

With the development of IA technology, the importance of graph ink technology in workstations has increased, making effective use of dedicated processors dedicated to graphic processing, which is the basic technology of man-machine interfaces. This workstation primarily displays graphics using a bitmap display device in which one bit in memory corresponds to one dot on the screen. Technology for displaying figures in color on such bitmap displays is also considered important, and in this case, it is possible to represent the type (style) of line segments such as dotted lines, solid lines, one-dot chain lines, or two-dot chain lines, and at the same time express the line segments of each dot series. A technique is required to specify the minutes using a specified color. A device for drawing arbitrary line segments on a bitmap display is performed using a digital differential analyzer (DDA). That is, line segments are generated in units of dots by the main control unit giving the DDA the coordinates of the start point and end point, the absolute value of the difference in each of the X and Y directions, the length in the main axis direction, etc., but color display is not possible. On the screen, it is necessary to specify a color for each dot of a line segment. Conventionally, in this type of line segment drawing method on a color display screen, for example, when drawing a broken line etc. on a color display screen, the position, direction, length, etc. of the line segment drawing is specified, and at the same time, a color specification register is set. Each section of the dashed line was drawn by specifying the color using the . Therefore, it has the disadvantage that the processing speed for drawing line segments is slow.

[Problem that the invention seeks to solve]

The present invention eliminates these conventional drawbacks, and instead of specifying a color for each dot when drawing line segments with a specific color and style, This method generates a requested line segment by changing the line style and color, and provides a line segment drawing method that can draw colored line segments at high speed.

[Means for solving problems]

In order to solve the above problems, the present invention provides a graphics processing system that displays graphics in color using a plurality of bitmap planes, which includes a line-segment drawing means for drawing line segments, and a line-segment drawing means for creating line patterns and storing them in a line pattern register. a line pattern creating means for specifying a color using a color specifying pattern; a color specifying means for specifying a color using a color specifying pattern; After drawing a line segment according to the pattern, the line pattern is changed for the basic line segment by the means, another new color is specified using the color specifying means, and the changed line pattern is This is achieved by providing a method for drawing line segments on a color display screen, which is characterized by displaying dots corresponding to the new color in the new color.

[For production]

On the screen of a display device that displays colors by specifying colors using multiple bitmap planes, a basic line segment is drawn using a color register that specifies a bitmap plane, and then another specified color is displayed. Using a color register, the color at the time of drawing is replaced with a dot corresponding to a line pattern register representing a line segment drawing pattern.

〔Example〕

Next, the J-gland tiff image method on a color display screen according to the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a graphic processing system for drawing line segments according to the present invention.

A display processor (DP) 100 is a part that performs overall control for performing graphic processing and includes a central processing unit therein. DPloo mainly executes parameter setting and startup for the digital differential analyzer (DDA) 200. The DDA 200 is hardware for processing line segments dot by dot, which is necessary for mask operations such as enlargement, reduction, translation, and rotation of partial figures. DDA200 is the coordinate X from DPloo
and Y, the absolute values of the differences between X and Y, DX, DY,
Input parameters such as principal axis direction DIR1, length LEN in principal axis direction, and draw a line segment.

That is, DDA 200 calculates the address of bitmap memory 300. The line pattern register 400 is a register that stores a bit pattern indicating the style of a line segment, for example, a solid line, a dotted line, a dashed line, a dashed double dotted line, etc. For example, when it is desired to draw a dotted line segment, a bit pattern formed by alternately connecting consecutive logical 1 dots, continuous logical O dots, etc. will be stored. D.D.A.
200 and the contents of the line pattern register 400, a mask pattern is created. The mask pattern is applied to each bitmap plane of the bitmap memory 300, that is, RGB.
There is a butterfly for RGB corresponding to each of the N=3 bitmap planes corresponding to , and logic is written to the X and Y coordinates on the bitmap plane in the line style specified by each line pattern register 400. Decide whether or not. A color designation register 600 exists for each ROB corresponding to each plane of the bitmap memory 300, and is used to designate the color of a line segment. The bitmap memory 300 consists of three bitmap planes of RGB, ie, three bitmap planes with N=3, and each bit on each bitmap plane exists corresponding to one dot on the screen of the bitmap display 900. The feature of the present invention is to output different line segments with different colors by changing the style and color of the current line segment by appropriately controlling these two types of registers, namely the line pattern register 400 and the color specification register 600. Then, it is stored in the bitmap memory 300 as the current line segment. According to the present invention, after a basic line segment based on a mask pattern created once is colored in the color specification register 600, the contents of the line pattern register 400 are changed, and this newly created line pattern is used to color the basic line segment in the color specification register 600. By specifying a different color from 600, for example, each section of the broken line can be easily displayed in color.

For example, when drawing dotted lines of alternating red and blue colors, the present invention is carried out by the procedure shown in FIG. Figure 2 (al is the starting point on the red apple shape (
This is an example diagram in which a broken line of the same color as the figure is drawn from the end point (x2°y2) to the end point (x2°y2). In this case, the contents of the color designation register 600 are designated as red, which is the same color as the figure. Based on the address calculation by the DDA 200, a line segment is drawn on the bitmap screen from the starting point (x+ + y+) in the designated direction as shown in the figure. This is DD
This is a case where a line segment is drawn according to an algorithm executed by the A200 hardware, and the line segment is displayed in an integer coordinate system. D D A 200 is D'P 10
A line segment of a series of points is drawn by giving starting point coordinates and ending point coordinates from 0, the absolute value of each difference in χ and Y, the length in the principal axis direction, etc. The line pattern register 4 is used for the bitmap point sequence generated in this way.
A pattern in which the content of 0'0 shows a solid line, i.e. 1111
111111..., the starting point (X+, y+
) to the end point (Xz,)'z) Color specification register 600
A solid red line specified by is drawn. Here, if there is a logic 0 in the contents of the line pattern register 400, no color is specified for the dots in the bitmap pattern corresponding to that 0, and no color is specified for the dots in the column corresponding to the logic 1 in the line pattern register 400. A masking operation is performed as specified. FIG. 2(b) is a mask created by adding the above pattern of the line pattern register 400 to the bitmap plane of FIG. The shape is a combination of the red pattern and the red apple shape of Bi-7 Tomanop. Next Riko,
FIG. 2 (The contents of the line pattern register 400 corresponding to the solid line in bl are 11100011100 corresponding to the broken line.
Change the pattern to 0111... Therefore, to represent the straight line from point (xt, yl) to point (X2.y2) as a broken line, specify blue in the color specification register 600,
A dashed line pattern is selected by the line pattern register 400 and replaced with blue accordingly. A mask pattern is created using the contents of this line pattern register 400, and the line pattern corresponding to the logic 1 of the line pattern register 400 is Color specification register 60 for the dot, this time blue.
If you specify from 0, a broken line will be created in which blue is inserted between the reds compared to the current solid red line.

That is, by using a mask created by converting the contents of the line pattern register 400 from solid lines to information indicating broken lines, a different blue color other than red can be inserted between the lines.
A dashed line will be created that alternates between different colors: red, blue, red, blue. In this way, in the present invention, a new mask pattern is created by changing the contents of the line pattern register 400 for a line segment that currently has a line style and color, and furthermore, a new mask pattern is created by giving information on a different color to create various lines. A line segment expressed by style and color will be formed.

Next, processing operations according to the line segment drawing method on a color display screen according to the present invention will be explained with reference to FIG.

Set the length, direction, position, etc. of the line segment from DPloo, and
When given to DA200, DDΔ200 calculates a bitmap address for drawing a line segment.

In other words, the starting point (X+, yl) and the ending point (x2゜y
z) is given (STI).

If the contents of 400 are solid lines, they are all set to logic 1 as shown in the figure (ST3).

At this time, the contents of the line pattern register 400 and the DDA
A mask pattern is created using the outputs of 200, and this mask pattern has one output for each RGB memory plane.
For example, a mask pattern corresponding to the bitmap plane for N=1 is created. Next, according to the contents of the line pattern register 400, the starting point (
xt, 3'+) and the end point (Xz, yz) are made red (Sr4). Next, in order to set a different blue color for the line segment, a blue color is set using the color designation register 600 at N=3 in color designation (Sr1).

Then, the contents of the line pattern register 400 for the newly specified blue line segment are converted into a line pattern 111000111000 for drawing a broken line: 5T6), point (xt, yl), point (xt).

yz) and turn it blue according to the line segment and line pattern.
(Sr1).

According to the above algorithm, a line segment in which red and blue dots are alternately connected will be displayed on the display screen as shown in FIG. 2 (C1) (Sr8). As mentioned above, a specified color can be displayed in a specified bitmap by appropriately controlling the two types of bit patterns: the line pattern and the color specification pattern. After drawing the basic line segment using the specification register 600, a color specification register 6 representing another specified color is used.
00 is used to replace the dot corresponding to the line pattern register 400 representing the line segment drawing pattern with the color at the time of drawing.

C Effects of the Invention] The present invention differs from the conventional method of specifying a color when generating dots for each line segment for a line pattern, a color specification pattern, and a pattern indicating position information for the current line segment. It is possible to change a line segment with the desired color and style to a line segment with the requested color and style, and the effect is that color and style specifications can be easily performed at high speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of a graphic processing system according to the method of drawing line segments on a color display screen according to the present invention, and FIG. 2(a)
, (bl, (C1 is an explanatory diagram of an embodiment explaining the operation of the present invention, respectively, and FIG. 3 is a flowchart of the operation of the present invention. 100...Display processor (DP), 200
...Digital differential analyzer (DDA), 300...
・Bitmap memory, 400...Line pattern register, 600...Color specification register, 900...Bitmap display device. Patent applicant Fujitsu Co., Ltd. Figure 2 Figure 2 (C)

Claims (1)

[Claims] In a graphic processing system that displays figures in color using multiple bitmap planes, there is a line segment drawing means that draws line segments, a line pattern creation means that creates a line pattern and stores it in a line pattern register, and a line segment drawing means that creates a line pattern and stores it in a line pattern register. After drawing a line segment according to the line pattern and the color specifying pattern for a basic line segment using the color specifying means, the line pattern creating means, the color specifying means, and the line segment drawing means, the means draws the line segment according to the line pattern and the color specifying pattern. Changing the line pattern for the basic line segment, further specifying another new color using the color specifying means, and displaying the dots corresponding to the changed line pattern in the new color. A method for drawing line segments on a color display screen characterized by: