JPS6048757B2 - Color surface graphic display processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for displaying a surface image by supplying outline data including color information to a color surface graphic display processing device, particularly a raster scanning graphic display device.

Conventionally, when displaying the triangle a shown in FIG. 1 with this type of device, the contour line is generated on a digital memory, and a refresh signal is turned ON/OFF at the timing of reading out the contour line data on the digital memory to display the contour line. The method used was to fill it in.

Therefore, the contour data must be an even number with respect to the scanning direction when filling. In general, the number of pixels n of the contour line generated on the digital memory is not constant in the filling direction, so if you simply fill in between the contour data, the displayed image will be distorted. There was a drawback that the image turned into image c. In addition, there are cases where a method is used in which only the color change points are included as outline data, but if processing such as rotation of the figure is performed, the left-right relationship between the colors will be disrupted, resulting in a completely different image. There were flaws.

In order to solve these drawbacks, the present invention generates the left and right colors of the outline simultaneously so that a screen image can be displayed.The drawings will be described in detail below.

FIG. 2 begins with an explanation of how to represent a contour line, and the two end points of the line segment representing the contour line and the right and left sides of the line segment are represented by color.

Note that the line segment may be a straight line or a curved line, or may be coordinate value data of the line segment. In FIG. 2, line segments Ab, bc, and ca have color information B on the left side and R on the right side. FIG. 3 is an explanatory diagram for explaining the principle of the present invention. As shown in FIG. 3a, the color figure to be displayed is assumed to have a red background (R) and a blue triangle (B).

The background is a figure surrounded by line segments Ab, bc, cd, and da, and the Ξ-gon is a figure surrounded by line segments Ef, fg, and . FIG. 3b is an example of limbal line data, which gives left and right color information in the direction from the starting point to the ending point of the limbal line. Figure 3c shows the state of pixels on the digital memory when line segments are generated according to the present invention.
This shows the state when line segments D, fg, and ge representing a Ξ-gon are generated. Next, a procedure for generating limbal lines will be explained.

Now, the starting point of the line segment Ef is (Xe, ye), and the ending point is (X,,
yf), and a line segment from (Xe, ye) to (Xf, yf) is digitally generated. This line segment generation is performed using a digital differential analyzer (DDA).
This can be easily realized using the RencialAnalyzer). The grid coordinates of the line segment generated here at time t are (
x,,Y,), and if Iy,=y,−,−1, then (x,
,y,) and the right color at (X, f,,y,), and if Iiy,=y,−,+1, then (x,,y,)
The left color is generated at (x, −, y,), the right color is generated at (x, −, y,), and I
If iiiy,=y,-, nothing occurs in the digital memory.

By generating the limbal line in this manner, the colors on the left and right sides of the limbal line can be generated simultaneously.

Furthermore, although the outer frame represented by the line segments Ab, bc, cd, and da does not have outside color information, it is outside the digital memory space, so it is sufficient to generate only the colors on the left side. Also, in the above explanation, the X address and y address are calculated each time and stored in the digital memory. However, after receiving the X and y addresses of the limbal line address information that have already been obtained, it is written to the digital memory only when there is a change in the y address compared to the previous state. It's okay. Fig. 4 is an explanatory diagram showing the procedure for displaying the limbal line data generated in this way on a surface image, in which Fig. 4 I shows the clock, Fig. 4 ■ shows the limbal line data on the digital memory, Figure 4 ■ is a signal obtained by ORing the signals from the digital memory;
The color information obtained in Figure ■ is held and read out continuously until the timing shown in Figure 4 ■, and the color information is simultaneously updated at this timing to obtain a surface image signal, and this surface image signal is converted into raster scanning format. If you output it to a display terminal, you can obtain a surface image.

Figure 5 shows an example of the configuration of a device that realizes these. In the figure, 1 is a register that holds the latest y address, 2 is a register that holds the previous y address, and 3 is a register. a comparator for detecting the difference between register 1 and register 2;
is a register that holds the X address, 5 is an adder, 6 is a write circuit, 7 is a register that holds left side color information, 8 is a register that holds right side color information, 9 is a digital memory, 10 is a read circuit, 11 is a raster scanning type display device. The y address received from the outside is held in the y address register 1.

Register 2 receives the contents of register 1 when the next y address is input. Comparator 3 compares the contents of register 2 and register 1, detects a change in the y address, and outputs +1 if it is negative and -1 if it is positive. The X address received from the outside is held in the X address register 4. Adder 5 obtains the output of comparator 3 and outputs -1 or +1.
It performs the calculation and outputs the X address to the write circuit 6.
The write circuit 6 writes the Y address of the Y address register 1, which holds the latest y address, and the X address register 4.
, the address of the output (x+1) or (x-1) from the adder 5, and the color information of the color registers 7 and 8 are obtained and written into the digital memory 9. The read circuit 10 is a circuit for refreshing and reading the digital memory 9, and is composed of a flip-flop circuit, and performs a logical sum on output signals from the digital memory 9 to generate a reset signal. The data read from the digital memory holds the color information obtained from the digital memory 9 until a reset signal is input, and the color information is updated every time the reset signal is input. A plane image is displayed by outputting the signal thus obtained to the lath multi-scanning display device 11. As explained above, according to the present invention, when writing limbal line data, only when the y address of the limbal line changes, the left and right colors of the limbal line are simultaneously written into the digital memory. Therefore, the process of filling out the limbal line and converting it into a surface image is greatly simplified.

In addition, when rotating a surface figure, you only need to perform rotation calculations on the starting and ending points of the line segment, so you can obtain a rotated figure with good image quality in a short time, and retain color information on the left and right sides of the limbal line. This has the advantage that the relationship between the left and right colors does not collapse when the figure is rotated.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining the conventional display mode, FIGS. 2 and 3 are explanatory diagrams for explaining the principle of the present invention, and FIG. 4 is an explanatory diagram for explaining the signal when converting into a plane image. FIG. 5 shows an embodiment of the apparatus of the present invention. 1 is Y address register, 2 is Y address register, 3
4 is a comparator, 4 is an X address register, 5 is an adder, 6 is a write circuit, 7 is a left color register, 8 is a right color register, 9 is a digital memory, 10 is a read circuit, and 11 is a raster scanning type display device.

Claims (1)

[Claims] 1. In a graphic display device having a refresh memory that corresponds two-dimensionally to the display screen, when writing outline data of an image to be displayed into the refresh memory,
means for writing contour data including two color information that changes with the contour as a boundary corresponding to a writing position of the contour data; and means for sequentially scanning the refresh memory in a predetermined direction to read the written contour. and means for continuously generating the same color information after detecting line data until different contour data is detected, and generating and displaying a surface image from given contour data. Color surface graphic display processing device.