JPH05210480A - Rectangular cursor display device - Google Patents

Abstract

PURPOSE:To provide a rectangular cursor display circuit which can speed up the plotting of a cursor without any flicker and without requiring any special memory for plotting the rectangular cursor. CONSTITUTION:The two adjacent sides of the rectangular cursor are displayed by one circuit 1-1 of two cross hair cursor display circuits and a register 4-1 to set the display range of this circuit 1-1, the remaining two sides of the rectangular cursor are similarly displayed by the remaining cross hair cursor display circuit 1-2 and a register 4-2 to set the display range of this circuit 1-2, and the cursor data of these two display circuits 1-1 and 1-2 and image data FD are overlapped through an overlap circuit 3, outputted to a display device 02 and displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for displaying a rectangular cursor that designates a rectangular area on the screen of a computer display. In the following figures, the same reference numerals indicate the same or corresponding parts.

[0002]

2. Description of the Related Art Conventionally, in this type of display device, a method of displaying a rectangular cursor by software has been widely used as a method of pointing an arbitrary partial area of a screen.

[0003]

However, the above method requires extra memory for drawing the cursor in order to draw a rectangular line by software, and the larger the rectangle, the longer it takes to draw and It had the drawback of flickering. As a method of compensating for this drawback, a method of using two crosshair cursor display circuits as commercially available hardware (LSI) can be considered, but the commercially available crosshair cursor display circuit cannot specify the display range of horizontal lines and vertical lines. However, there is a disadvantage that it becomes a double-digit cursor and it is difficult to understand where the pointing area is.

Therefore, an object of the present invention is to provide a rectangular cursor display device capable of clearly pointing a partial area of a screen with a rectangular cursor without using a special memory and without causing display flicker. To do.

[0005]

In order to solve the above-mentioned problems, a rectangular cursor display device according to claim 1 is a means for setting an intersection of a horizontal line and a vertical line in a computer display (registers 41, 42, etc.). ) And means for setting the display range of the horizontal lines and the vertical lines (registers 43 to 46, etc.), and two crosshair cursor display circuits (1, etc.) are provided.

The rectangular cursor display device according to claim 2 is
Two adjacent sides of the rectangular cursor are displayed through one of the crosshair cursor display circuits, and the remaining two sides of the rectangular cursor are displayed through the other side of the crosshair cursor display circuit.

[0007]

In addition to using two crosshair cursor display circuits, a means for designating the display area of each crosshair cursor is provided so that the rectangular area can be displayed in an easy-to-understand manner.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the main parts as an embodiment of the present invention. In the figure, 01 is a rectangular cursor superimposed screen data output device, 02 is an image display device such as a CRT, 1 (1-1, 1-2) is a crosshair cursor display circuit having the same configuration, 4 (4-1, 4-2). ) Are cursor setting registers of the same configuration for setting the cursor display range on the display circuits 1-1 and 1-2, respectively, and 3 is the screen data FD and the cursor output by the cursor display circuits 1-1 and 1-2. It is a superposition circuit that superimposes the display data and gives it to the display device 02.

Here, the cursor setting register 4 is a register 41 for setting an X address of a cross coordinate of a horizontal line and a vertical line as a cross hair, a register 42 for setting a Y address of the cross coordinate, and a display range of a horizontal line. It comprises registers 43 and 45 for setting the start X address and the final X address, respectively, and registers 44 and 46 for setting the start Y address and the final Y address of the display range of the vertical line.

FIG. 4 shows an example of a rectangular cursor (hatched portion) displayed by the circuit of FIG. Where (X1, Y
1), (X2, Y1), (X1, Y2), (X2, Y
2) is the coordinates (address) of the four corners of this rectangular cursor. In FIG. 1, the crosshair cursor display circuit 1-1.
1-2 has a function of displaying one independent crosshair cursor at any coordinate in any display range. Each coordinate position and display range are displayed in the cursor setting register 4-1.
It can be set to 4-2.

FIG. 2 shows a crosshair cursor display circuit 1-1.
The example of the display by is shown. That is, in this example, the cursor display circuit 1-1 is used to display the crosshair cursor at a position corresponding to the upper left of the rectangular cursor. At this time, by using the display range designating function of the cursor display circuit 1-1 (that is, the cursor setting register 4-1), as shown in FIG. 2, the dotted line portion is not displayed, and only the practical portion within the rectangle is displayed. ..

In this case, the cursor setting register 4-
To set to 1, the cross coordinate X address setting register 41 is set to X1, the cross coordinate Y address setting register 42 is set to Y1, the display range start X address setting register 43 is set to X1, and the display range start Y address is set. Y1 is set in the register 44, X2 is set in the display range final X address setting register 45, and Y2 is set in the display range final Y address setting register 46.

As a result, the cursor display circuit 1-1
Displays the top and left sides of the rectangular cursor. Figure 3
Shows an example of display by the crosshair cursor display circuit 1-2. That is, in this example, the cursor display circuit 1-2 is used to display the crosshair cursor at the position corresponding to the lower right of the rectangular cursor. At this time, the cursor display circuit 1
-2, the display range designation function (that is, the cursor setting register 4-2) is used to display only the solid line portion within the rectangle without displaying the dotted line portion as shown in FIG.

In this case, the cursor setting register 4-
To set to 2, the cross coordinate X address setting register 41 is set to X2, the cross coordinate Y address setting register 42 is set to Y2, the display range start X address setting register 43 is set to X1, and the display range start Y address is set. Y1 is set in the register 44, X2 is set in the display range final X address setting register 45, and Y2 is set in the display range final Y address setting register 46.

As a result, the cursor display circuit 1-2
Displays the bottom and right sides of the rectangular cursor. With the above method, as shown in FIG. 4, it is possible to display a rectangular cursor surrounding an arbitrary partial area on the display screen and designate an arbitrary partial area of the screen.

[0016]

According to the present invention, since a rectangular cursor is displayed by using two crosshair cursor display circuits as hardware having means for setting the display range, a special cursor for drawing the cursor can be displayed. Does not need a lot of memory.

There is no flicker required. It is possible to specify the area without any discomfort by using the rectangular cursor. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration of essential parts as an embodiment of the present invention.

FIG. 2 is a diagram showing a display example of one crosshair cursor display circuit of FIG.

FIG. 3 is a diagram showing a display example of the other crosshair cursor display circuit of FIG. 1;

FIG. 4 is a diagram showing a rectangular cursor.

[Explanation of symbols]

 01 Rectangular cursor superimposed screen data output device 02 Display device 1 (1-1, 1-2) Crosshair cursor display circuit 3 Overlay circuit 4 (4-1, 4-2) Cursor setting register 41 Cross coordinate X address setting register 42 Cross coordinate Y address setting register 43 Display range first X address setting register 44 Display range first Y address setting register 45 Display range last X address setting register 46 Display range last Y address setting register

Claims (2)

[Claims] 1. A computer display comprising two crosshair cursor display circuits having means for setting an intersection of a horizontal line and a vertical line and means for setting a display range of the horizontal line and the vertical line. Characteristic rectangular cursor display device. 2. The rectangular cursor display device according to claim 1, wherein two adjacent sides of the rectangular cursor are displayed through one of the crosshair cursor display circuits, and the rectangular cursor is displayed through the other side of the crosshair cursor display circuit. A rectangular cursor display device characterized in that the remaining two sides are displayed.