JPH0113109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a cursor display method on a graphic display.

<Prior art> Generally, in graphic displays,
It is necessary to display a cursor mark for each dot. This is because each dot has a display (instruction) point for displaying the graphic data generated by the processing device. When displaying a cursor, some conventional character displays display a line below the character display area, and since it is displayed in units of characters, it is a continuous line of five or more dots, for example. However, in the case of a graphic display, unlike a character display, only one dot is displayed, so a line display method is not possible. Conventionally, in graphic displays, a method has been known in which a cursor mark is displayed by displaying a cross between a vertical line and a horizontal line, but this method has the drawback that the cross display is difficult to see around the periphery of the screen.

<Purpose> The present invention has been made to solve the above-mentioned conventional drawbacks, and provides a cursor display method in which an appropriate pattern is selected depending on the screen section and the cursor position can be reliably confirmed in a graphic display. The purpose is to provide.

<Example> In Fig. 1, 1 is a control unit (CPU)
A key input device 2, a memory unit 3, and a graphic display controller 4 are connected thereto. The key input device 2 is provided with alphanumeric keys, control keys, etc., and these control keys are provided with left, right, up, and down keys, respectively, for moving the cursor dot by dot on the CRT display screen. . In memory unit 3
A display data memory area 31 stores various original figure data, character data, etc. to be displayed on the CRT screen, a pattern generator area 32 generates patterns of character data, and a , a cursor counter (CC) 33 that holds cursor coordinates,
The position where the CRT screen is divided into two vertically and horizontally, that is, the horizontal branching coordinate X ₀ and the vertical branching coordinate Y ₀
A partition register (BR) 34 for predetermining and storing semi-fixed information, and areas 35 for various other buffers and flags are formed. Four cursor mark patterns are formed in the pattern generator area 32, respectively, and the tool 1
9 is shown in FIG. The cursor point is at the position indicated by , which is the apex of the arrow pattern. If the cursor is located in section A of the screen seen from the front in FIG. 3, the pattern shown in FIG. 2 is selected. In the case of section B, the pattern is selected, and in the case of sections C and D, the respective patterns are selected. One of these selected patterns is displayed in the graphic display control 4.
The image data is written into the image memory 5 (for example, refresh memory) and displayed. For example, NEC's UPD7220 can be used as the graphic display control 4. This graphic display is developed into a graphic pattern based on the supply of original graphic data from the CPU 1 and stored in the image memory 5. For fixed patterns such as characters and cursor marks, pattern information is read out from the pattern generator area 32 in the memory unit 3 and written into the image memory 5 via the graphic display controller 4. For display control, the image memory 5 is accessed in synchronization with raster scanning, and the image is supplied to the CRT display device 8 via the parallel/serial conversion circuit 6 and CRT driver 7 for display. _L1 is the data line, _L2 is the control line and synchronization signal line.

Next, the operation will be explained according to FIG. When the cursor key of the key input device 2 is operated (S100), the cursor counter (CC) 33 is counted up or down depending on the direction of the operation (S101). Here, the magnitude relationship between the counted horizontal position (Xi) of the cursor counter 33 and the horizontal position (X ₀ ) of the partition register (BR) 34 is compared. If the cursor position is within section A or C of the screen, the process advances to step S103. B or D on the screen
If it is within the section, proceed from S102 to S104. In S103, the vertical position (Yi) of the cursor counter 33
and the vertical position (Y ₀ ) of the partition resistor 34 are compared. If the cursor position is within section A of the screen, proceed to S110, and if it is within section B, proceed to S130.
Proceed to. In S104, the magnitude relationship between the contents of the cursor counter 33 and the partition register 34 is compared as in S103, and if the cursor position is within the B partition, S120
If it is within section D, proceed to S140. If the cursor position is within section A, steps from S110 onwards are executed. That is, the cursor pattern shown in FIG. 2 is selected, and the address of the pattern generator area 32 that stores this cursor pattern is
l ₁₁ , and further indicates the address of the image memory 5 corresponding to the cursor counter 33. Next, one line of pattern data (for example, 16 dots) of the pattern is written to the corresponding address position of the image memory 5, the addresses of the image memory and pattern generator area are uploaded for one line, and the above operation is repeated to write all the patterns ( When the cursor pattern shown in FIG. 2 is written in the image memory 5, it is superimposed on other graphic data. Therefore, by controlling the display below, the cursor mark for section A is displayed pointing upward to the left. Also, if the cursor is in section C,
The steps after S130 are executed, a cursor pattern is selected, and the first _l3o is indicated. This is the last line of the pattern. The address of the image memory 5 corresponding to the cursor counter 33 is designated as the beginning of the line. The cursor pattern is read line by line from the pattern generator and written into the image memory 5. Further, the line address is decreased by one line and the above operation is repeated. The difference from the cursor pattern is that writing is done in the opposite direction. After this operation, the display is controlled, and the cursor pattern in the C section is displayed in a pattern pointing downward to the left with the cursor at the apex. Furthermore, if the cursor is within section B, steps from S120 onwards are executed. The cursor pattern is selected, _l21 is addressed, and the address of the image memory 5 is set to the position corresponding to the cursor counter 33. Subsequently, the beginning of the set line address in the image memory 5 is moved down by the pattern width (m) (16 dots in the example). Subsequently, the steps after S112 are executed, and the cursor pattern is written into the image memory 5 and displayed. Therefore, in section B, an arrow pattern pointing upward to the right is displayed with the apex as the cursor position. Further, when the cursor is located within the D section, S140 is operated, and the steps from S132 onwards are operated, and an arrow pattern in the lower right direction with the apex as the cursor position is displayed. In this way, since an appropriate pattern is selected depending on the screen section, the cursor position can be reliably confirmed.

In the above embodiment, the section is divided into four sections, but it may be divided into multiple sections and each section may have its own cursor pattern.The cursor pattern can be set in various patterns other than an arrow pattern with the origin as the cursor point. In addition, in the example, the pattern was written superimposed on the graphic data, but on a color display, the effect can be increased by making the cursor mark a different color, and the cursor mark can be written in a different color when reading data from the image memory. It may also be read out and displayed in combination.

<Effects> As described above, the present invention has the advantage of providing a cursor display method in a graphic display in which an appropriate pattern is selected depending on the screen section and the cursor position can be reliably confirmed.

[Brief explanation of drawings]

FIG. 1 is a system block diagram of a graphic display according to the present invention, FIG. 2 is an example of a cursor pattern, FIG. 3 is a diagram showing screen sections, and FIG.
The figure is a flowchart for explaining the operation. Explanation of symbols, 1: CPU, 2: Key input device,
3: Memory unit, 4: Graphic display controller, 5: Image memory, 32:
Pattern generator area, 33: Cursor counter, 34: Section register.

Claims (1)

[Scope of Claims] 1. Section storage means that divides a display screen into a plurality of parts and stores the branch coordinates thereof; Mark storage means that stores a cursor mark for each divided screen; and cursor position and coordinates of the section storage means. and control means for determining the section where the cursor is located by comparing the cursor mark with the mark storage means, and selecting and displaying a corresponding cursor mark from the mark storage means based on the determination result, the section where the cursor is located. A graphic display characterized by selectively displaying a cursor pattern.