JPH0231392B2 - CRTHYOJIKEINIOKERUKAASORUHYOJIHOSHIKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cursor display method in a CRT display system.

By the way, in the image and cursor display in a general CRT display system, as shown in FIG. and is displayed on the CRT (cathode ray tube) 3 via the display control circuit 2, and a cursor line is displayed at a predetermined position on the CRT 3 via the keyboard 4 operation and the cursor display circuit 5. There is. Frame memory 1
1 stores an image composed of a pixel pattern as shown in FIG. 5, for example. The image to be stored in the frame memory 11 is input from the keyboard 4 according to an input user's instruction. Operations performed on the keyboard 4 are converted into a keyboard signal KS consisting of position, pixel black and white information, etc. and output. Further, the pixel data storage address generation circuit 51 in the cursor display circuit 5 calculates the physical location (address) on the frame memory 11 where the pixel information is to be stored based on the position information of the keyboard signal KS, and generates the storage address signal AS. occurs. As a result, pixel information is stored in the location on the frame memory 11 indicated by the address signal AS.

The cursor signal generation circuit 52 generates a keyboard signal
The position of the pixel that the operator is paying attention to is obtained from the position information in KS, the corresponding display position on the CRT 3 is calculated, and a cursor signal CS indicating the position on the CRT 3 is generated. Display dot generation circuit 12
The pixel information is sequentially read out from the frame memory 11, and a plurality of display dots corresponding to whether the pixel is white or black are generated as a display dot signal DS. The display control circuit 2 receives the input display dot signal.
Converts the DS to a video signal VS and sends it to the CRT3, and the display position on the CRT3 is determined by the cursor signal.
If the position is equal to the position indicated by CS, a video signal VS for displaying the cursor is generated, mixed with the video signal VS converted from the display dot signal DS, and sent out, thereby displaying the cursor on the CRT 3.

Note that the example in FIG. 5 shows that there are three black dots in an L-shape in 4×4 pixels.

The image displayed on the CRT 3 is, for example, as shown in FIG.
according to the contents of the frame memory within. If you want to compare this image with the original and make corrections, use the keyboard 4 to move the horizontal cursor line l.
By moving the vertical cursor line L pixel by pixel, the pixel 10 at the intersection position is erased or formed.
Here, erasure and creation of the pixel 10 is performed by operating the keyboard 4, and the cursor lines I and L are always formed to pass approximately through the center of the pixel 10. Therefore, if the pixels 10 of the image are not dense as shown in FIG.
By specifying pixel 12 with l2 and L3, pixel 13 with cursor lines l1 and L1, and position 14 with cursors l1 and L3,
The current position of the cursor line can be seen from the gap space between the pixels 10, and there is no particular problem in correction work.

However, as shown in Figure 3, pixel 1 of the image
For example, if you try to move the cursor line to L3 and L4 to specify pixel 15, the image of the cursor line will only appear at the end, so it will be very difficult to find the specified position. There are some drawbacks. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cursor display method that does not have these drawbacks.

This invention will be explained below.

In the CRT display system as described above, the present invention displays the cursor lines L and L so as to be in contact with the periphery of the pixel 10 to be corrected in the image, as shown in FIG. By specifying the position accurately and pointing the display dot adjacent to the intersection of cursor lines L and L,
This allows smooth and highly accurate correction work to be performed on pixels in units of display dots. The cursor display method according to the present invention is used when one pixel of an image to be displayed is displayed using a plurality of display dots on a CRT display system.

FIG. 5 shows an example of an image to be displayed, and FIG. 6 shows the image shown in FIG. An example is shown in which the display is aligned with the 1 display dot on the upper side of the character. The example in Figure 6 is a CRT
This shows the case where the display dots of the display system are 20×20, and B indicates the display of black pixels, and W indicates the display of white pixels. That is, in FIG. 3, the horizontal cursor line l4 is set to touch the bottom of pixel 10, and the vertical cursor line L5 is set to touch the bottom of pixel 10.
For example, when specifying the position of pixel 16, the cursor line touches the right side of the cursor line.
The positions of l4 and L5 can be clearly and easily known. The same applies when specifying and correcting the position of other images, such as the image shown in FIG. 6, and the ease of specifying the position and the work of confirming the specified position are significantly improved compared to the conventional cursor display method.

Note that the contact portions of the cursor lines L and l with respect to the pixels may be on the upper side or the left side, as long as the cursor lines can be seen from the gap space between densely packed pixels.

This invention allows information (figures) made up of a set of dots, such as character fonts and logos, to be displayed on the CRT screen of a computer or personal computer, and the presence or absence of each display dot that constitutes the character fonts, logos, etc. can be easily checked. To provide a drawing method that displays a dot so that it can be recognized and also displays a cursor that can easily indicate a single display dot to be corrected on the screen. Figure 4 shows an example of the processing flow. When keyboard 4 is pressed (steps S1 and S2),
Determine the type of input key pressed (step
S3). Then, in the case of left/right/up/down movement keys 11 to 14, the cursor is moved left/right/up/down by one display dot (steps S31 to S34), and in the case of display key 15, the cursor is moved to the upper right by half a display dot at the cursor intersection. A circle the size of one display dot is displayed (step S35). Also, if the erase key 16 is pressed,
A circular area the size of one display dot in the upper right corner is erased by half a display dot at the cursor intersection (step S36).
In other words, the cursor line is positioned between adjacent pixels in step S35, and the display as described above can be realized. Note that display dots can be displayed or erased for pixels adjacent to the intersection of the cursor because the position of the cursor is constantly monitored by the display control system.

As described above, according to the cursor display method in the CRT display system of the present invention, a cursor line is displayed in the gap between display pixels, and the intersection point of the cursor line can be corrected while indicating the display dot of an adjacent pixel. Therefore, even dense pixels can be corrected with high precision.

[Brief explanation of drawings]

Figure 1 shows that this invention can be applied.
A block diagram showing an example of a CRT display system, FIG. 2 is a diagram for explaining a conventional cursor display method, and FIG. 3 is a diagram for explaining a comparison between the conventional cursor display method and the cursor display method according to the present invention. and FIG. 4 are flowcharts showing an example of the operation of the present invention, and FIGS. 5 and 6 are diagrams for explaining the correspondence between pixels and display images. 1... Dot display circuit, 2... Display control circuit,
3...CRT, 4...keyboard, 5...cursor display circuit, 10...pixel, 11...frame memory.

Claims (1)

[Claims] 1 This is a case where one circular pixel of an image to be displayed via a display control circuit is displayed using a plurality of display dots in a CRT display system, and the above-mentioned
In a cursor display method in a CRT display system in which the CRT display system is configured to modify the image portion indicated by the intersection of two orthogonal cursor lines, the cursor line is moved to the periphery of each pixel. By displaying the cursor lines so that they touch each other and correcting the display dots by indicating the display dots adjacent to the intersection of the cursor lines, correction work can be carried out smoothly in units of display dots even when a large number of pixels are present. A cursor display method for CRT display systems that is characterized by: