JPH02160287A - Cursor display circuit - Google Patents

Abstract

PURPOSE:To display a cursor properly for characters which differ in size by storing pieces of information on the position and size of the cursor and reading those pieces of information out according to the current position of the cursor. CONSTITUTION:A central controller 1 checks which area in a rectangular range stored in a cursor table 3 a display position stored by a pointer 2 is in and sends out the size of a character registered in the area to a cursor generating circuit 4. The cursor generating circuit 4 generates a cursor pattern corresponding to the specified size. The cursor pattern generated by the cursor generating circuit 4 is sent to a cursor drawing circuit 5. The cursor drawing circuit 5 receives the position information stored by the pointer 2 from the central controller 1 and displays the cursor at the specified position on the screen of the CRT 6. The processing is repeated to display the cursor for respective characters differing in size in order.

Description

[Detailed description of the invention] 1 strain higher! The present invention relates to a cursor display circuit, and more particularly to a cursor display circuit that displays a cursor on a display device such as a CRT in a personal computer, word processor, or the like.

Conventionally, this type of cursor display circuit has displayed a cursor by specifying a position on the screen of a display device called a line or column and drawing a cursor pattern on the screen. CRT is usually used as the display device, and the number of characters that can be displayed on the screen is usually 80 digits.
25 lines = 2000 characters. However, in the case of Japanese, the font is large, so the maximum length is 1000 characters.

In that case, the character can only be displayed at the position represented by the column and line on the CRT screen, and therefore the cursor for that character can only be displayed at the position represented by the column and line on the CRT screen. However, since the size of each character on the CRT screen was the same, there was no particular problem.

However, when displaying multiple characters of different sizes and displaying a cursor for each character, the size and position must be made variable. The drawback was that the cursor could not be displayed for different characters.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cursor display circuit that can appropriately display a cursor depending on the position and size of a plurality of characters of different sizes.

Structure of the Invention A cursor display circuit according to the present invention is a cursor display circuit that sequentially displays a cursor for each character on a display means for displaying a plurality of characters of different sizes, the cursor display circuit displaying a cursor to be displayed on the display means. position information storage means for storing position information indicating the current position of the cursor; size information storage means for storing size information indicating the size of the cursor to be displayed at the position indicated by the position information; and display control means for displaying a cursor on the display means according to the size information and the size information.

K belly] Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a cursor display circuit according to the present invention. In FIG. and cursor generation circuit 4
, a cursor drawing circuit 5, and a CRT 6.

The central control unit 1 inputs or updates data to the pointer 2 and the cursor table 3, checks the data in the pointer 2 and the cursor table 3, and requests the cursor generation circuit 4 for a necessary cursor shape pattern. .

Pointer 2 is a register that stores display position information indicating the current display position of the cursor.

The cursor table 3 is composed of memory etc.
The size of each character to be displayed on the RT6 screen is managed by a rectangle, and the upper left point (X 11I) is used to manage the size of each character to be displayed on the RT6 screen.

Yll) and the lower right point (X2m, Y2+c) are stored in coordinates.

The cursor generation circuit 4 is a circuit that generates a rectangular cursor-shaped pattern of a size requested by the central control unit 1.

The cursor drawing circuit 5 is a circuit that displays a cursor shape created by the cursor generation circuit 4 at a position on the CRT 6 indicated by the cursor display position information stored in the pointer 2 by the central control unit 1.

In such a configuration, when displaying a cursor, the central control unit 1 first stores its current display position in the pointer 2. In this case, the display position is the coordinates of the upper left point of the normally rectangular cursor.

On the other hand, rectangle management information is stored in the cursor table 3 by the central controller 1. In this case, the rectangle management information is each coordinate of the upper left point of the cursor.

The central control unit 1 checks which area of the rectangular range stored in the cursor table 3 includes the display position stored in the pointer 2 (that is, the upper left point), and
The registered character size in that area is sent to the cursor generation circuit 4. Cursor source F! @4 generates a cursor pattern according to the specified size.

The cursor pattern generated by the cursor generation circuit 4 is sent to the cursor drawing circuit 5. Cursor drawing circuit 5
receives the position information stored in the pointer 2 from the central control unit 1 and displays a cursor at a specified position on the screen of the CRT 6.

By repeating the above process, the cursor can be displayed in order for each character of different size. As a result, for example, as shown in CRT6 in the figure, loci 1llI (X11.Yll) and (X21.Yll)
21) and the coordinates (X12.
The cursor can be displayed in order for the characters displayed in the range Y12) and (X22.Y22).

Next, a display example by the cursor display circuit of this embodiment will be explained using FIG. 2. FIG. 0 is a schematic diagram showing a display example on the screen of the CRT 6 of FIG. 1.

First, in state (a), the magnitudes of r are different from each other.
The characters A, , rB, , rC4, and "DJ" are displayed, and the cursor is displayed at the position of the letter "A" (solid line frame).Here, press the cursor movement key on the keyboard (not shown). When pressed to move the cursor, the cursor will be displayed at the position of the letter rB, as shown in (b).

Further, if the cursor is moved further, the cursor will be displayed at the position of the letter "C" as shown in (c).

Similarly, in the case of (d), the cursor will be displayed at the position of the letter "D".

As described above, according to the present invention, a cursor of an appropriate size can be displayed for each character of different size.

In this embodiment, information on the position of the upper left point of the cursor is stored in the pointer 2, but it is clear that information on the position of the lower right point may be stored instead.

Further, in this embodiment, information on the positions of the upper left point and lower right point of the cursor is stored in the cursor table 3, but information on the positions of the upper right point and lower left point may be stored instead. The good news is obvious. In this case, information on the position of the upper right point or the lower left point may be stored in the pointer 2.

As explained above, the present invention stores information on the position and size of the cursor, and reads out the information according to the current position of the cursor. This has the effect that the cursor can be displayed appropriately for characters as well.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a cursor display circuit according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an example of display on the screen of the CRT shown in FIG. Explanation of symbols of main parts 2... Pointer 3... Cursor table 4... Cursor generation circuit

Claims (1)

[Claims] (1) A cursor display circuit that sequentially displays a cursor for each character on a display means that displays a plurality of characters of different sizes, and position information that indicates the current position of the cursor to be displayed on the display means. a size information storage means for storing size information indicating the size of a cursor to be displayed at a position indicated by the position information; and display control means for displaying a cursor on the display means.