JPS6021396B2 - Crosshair cursor generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crosshair cursor generating device in a graphic display device, which is an effective means for an operator to input positions (coordinates) on a display screen.

In the graphic display device, methods for inputting the value on the display screen include a method using a crosshair cursor, a method using a tablet, and a method using a light bar.

The tablet or light ben method has the disadvantage that the equipment is more expensive than the crosshair cursor method. The present invention is a crosshair cursor generating device that is capable of displaying a crosshair cursor by folding it over a figure that should originally be displayed as shown in FIG. 1, and constantly outputting positional information of the intersection to other devices. This makes it possible to realize the position input function of a graphic display device at low cost.

Embodiments of the present invention will be described below with reference to the drawings.

For ease of explanation, here, the resolution in the display area is 200 columns x 20, the horizontal planking period is equal to the time required to display 56 columns, and the vertical planking period is equal to the time required to display 56 columns. An example will be explained in which the present invention is applied to a raster scan type CRT display device in which the time required for horizontal scanning is equal. FIG. 2 is a block diagram showing one embodiment of the present invention.

In the figure, a column counter 2 is a 256-vessel counter that indicates the column position of the raster that is being scanned on the screen, and is counted up by a clock signal output from a clock oscillation circuit 1. The row counter 3 is a 256-decimal counter that indicates the row position of the raster that is being scanned on the screen, and is counted up by the signal output from the column counter 2. The timing chart of the clock signal, column counter output signal, carry output signal, and row counter output signal is shown in Figure 3a.
, b, c, and d. Note that in both columns (horizontal) and rows (vertical), the period between the output signals of the respective counters from 0 to 199 is the display period, and the period from 200 to 255 is the blanking period. The column trigger pulse generation circuit 4 uses the output signal of the column counter 2 at an appropriate timing within the horizontal blanking period, for example, when the column counter 2 is at 230.
Outputs a signal when . Similarly, the row trigger pulse generation circuit 5 outputs a signal at an appropriate timing within the vertical blanking period, for example, when the row counter 3 indicates 240, based on the output signal of the row counter 3. The column one-shot circuit 6 is triggered by the output signal of the column trigger pulse generation circuit 4 when the column counter 2 indicates 230, and outputs a pulse signal having a certain width as shown in FIG. This pulse width can be determined by the operator operating a variable resistor included in the column one-shot circuit 6, so that the trailing edge of the pulse can be set at any column position within 255, 0, 1,..., 1 scale. (The position indicated by the column counter 2) can be adjusted. Here, it is assumed that the adjustment is made to be in the middle of the column rank 122. In the same machine, the row one-shot circuit 7 is triggered by the output signal of the row trigger pulse generation circuit 5 when the row counter 3 indicates 240, and the fourth
As shown in the figure, a pulse signal with a certain width is output.
This pulse width is determined by the operator operating a variable resistor included in the row one-shot circuit 7 so that the trailing edge of the pulse is 2550, 1, . . . . It can be adjusted so that the line is placed at any position in one sea bream (the position indicated by the line counter 3). Here, it is assumed that the adjustment is made so that it is in the middle of row & counterfeit 12.

The column position signal generating circuit 8 synchronizes the output signal of the column one-shot circuit 6 with the output signal of the clock oscillation circuit 1, and the column position signal generating circuit 8 synchronizes the output signal of the column one-shot circuit 6 with the output signal of the clock oscillation circuit 1, and the column position signal generating circuit 8 synchronizes the output signal of the column one-shot circuit 6 with the output signal of the clock oscillation circuit 1. A signal is output during the period indicating. Similarly, the row position signal generation circuit 9 synchronizes the output signal of the row one-shot circuit 7 with the carry output signal of the column counter 2, and selects the next row position where green exists after the output signal of the row one-shot circuit 7, that is, the row counter 3. A signal is output during the period when the value is 13. The output signal of the column mosquito signal generation circuit 8 and the output signal of the row & false signal generation circuit 9 are combined with the display figure signal in the OR circuit 10, and then blanked for the non-display period via the AND circuit 11. Ru.
By processing the output signal of the AND circuit 11 as a video signal, a crosshair cursor is displayed on the screen superimposed on the figure to be displayed as the main button, as shown in FIG. On the other hand, the column position register 12 inputs the output signal (column position information) of the column counter 2 when the signal is output to the column position false signal generation circuit 8, and then inputs the output signal (column position false information) to the column position false signal generation circuit 8. The column position information is held until a signal is output.

The heading correction register 13 inputs the output signal (direction information) of the row counter 3 when the signal is being output to the heading box signal generation circuit 9, and then inputs the output signal (direction information) to the row position signal generation circuit 9. Holds heading information until a signal is output. Therefore,
A device such as a mother-child calculator can input position information of the displayed crosshair cursor at any time by reading the output signals of the column position register 12 and the line correction register 13. In order to facilitate understanding of the above explanation, the operation timing chart of each block in FIG. 2 is shown in FIG. 4 a, b, c, d, e, f, g, h.
, i, j.

As described above, according to the present invention, the operator can move the crosshair cursor while checking the position of the crosshair cursor on the screen by changing the output pulse width of the two one-shot circuits using an inexpensive means such as a variable resistor. It can be moved to a desired position and the position information can be constantly transmitted to other units, which has a very large effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of a screen in which a crosshair cursor is displayed in a normal shape, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. Figures a, b, c, d and Figure 4 a, b, c, d'e, f, g, h, i, j are diagrams showing the operation timing of each block in Figure 2.

1... Clock oscillation circuit, 2... Column counter, 3... Row counter, 4... Column trigger pulse generation circuit, 5... Row Trigger pulse generation circuit, 6... Column one-shot wax, 7...
Row one-shot Kaizuru, 8...Column position signal generation circuit,
9... Row position/false signal generation circuit, 10... OR circuit, 11... AND circuit, 12... Column position register, 13... Row position register. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A column trigger pulse generation circuit and a row trigger pulse generation circuit that generate column trigger pulses and row trigger pulses based on the output signal of the counter, and a trigger generated by the output signals of the column trigger pulse generation circuit and row trigger pulse generation circuit. and a column one-shot circuit and a row one-shot circuit whose output pulse widths are variable, and a signal during a scanning period at a certain column position and a certain row position corresponding to the output pulse width of the column one-shot circuit and row one-shot circuit. a column position signal generation circuit and a row position signal generation circuit, an OR circuit between the output signals of the column position signal generation circuit and the row position signal generation circuit and the display graphic signal, and a column position signal generation circuit and the row position signal generation circuit. It is equipped with a column position register and a row position register that latch the position information of the column counter and row counter by the output signal of the signal generation circuit, and by using the output signal of the OR circuit as a video signal, the crosshair cursor can be moved. In addition to displaying it superimposed on normal shapes,
The position information of the crosshair cursor is stored in the above column position register,
A crosshair cursor generator characterized in that it can be constantly transmitted to other devices via a line position register.