JPS59116786A - Cursor control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a cursor control method, which is suitable for use in character displays for character string editing and graphic displays for graphic processing editing. This invention relates to a cursor control method that allows movement.

[Prior art]

In conventional character displays and graphic displays, when specifying an object on the display screen or specifying a new display position, it is common to use function keys, dials, light pens, joysticks, etc. be. However, the method using function keys and dials can only move the cursor horizontally or vertically, and when the target position of the cursor is diagonally, it is difficult to specify the position, making it inconvenient to use. Ta. Also,
Although light pen joysticks are easy to operate, they are expensive.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in the position specification method of conventional CR and T display devices, and to easily specify the position on the display screen. An object of the present invention is to provide a cursor control method that is capable of controlling a cursor and is inexpensive.

[Summary of the invention]

The gist of the present invention is that in a CR/T display device in which the movement of the deer crane is controlled by a processor, an angle function switch that specifies the movement angle of the cursor, and both angles specified by the switch are provided. The cursor is provided with a switch for specifying direction movement and an angle register that can be read and written by the processor, and the processor takes in the contents of the angle register to control the movement of the cursor.

[Embodiments of the invention]

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

FIG. 1 is a perspective view of a display device with an angle specifying cursor, which is an embodiment of the present invention. As is clear from the figure, the device of this embodiment has, in addition to a normal keyboard 1, an angle function switch 2 that sets the cursor in the target angle direction, and a switch that normally moves the cursor in the left-right direction of the screen. , a function switch 3.4 that moves the cursor in both directions at that angle when an angle is specified with the angle function switch 2, and a function switch 5.6 that moves the cursor in the vertical direction of the screen. ing. Note that 7 indicates a cursor displayed on the display screen.

FIG. 2 is a diagram showing the movement of the cursor in the device of this embodiment. Conventionally, function switches 3 and 5 were used,
The cursor was moved as shown in (3) and (5) in the figure, but in this embodiment, the angle function switch 2 and the function switch 3 are used to move the cursor as shown in (2+3) in the figure. You can move the cursor directly to the target position. Further, if there is an error in the setting of the angle function switch 2, the position can be corrected using the normal function switch function after the above-mentioned (2+3) movement.

FIG. 3 is a diagram showing the detailed configuration of the apparatus of this embodiment. In the figure, 10 is a processor, and address bus AB
1 data bus DB, Read/Write signal line R
/W is used to interface with peripheral devices. Reference numeral 20 is an address decoder which decodes the contents of the address bus AB and generates a chip select signal indicating which chip to select for the peripheral device. 30 is a read-only memory (ROM);
A processor 100 control program is stored. 4
0 is random access memory (RAM), which is used as data memory for the processor 10.

An angle register 50 defines the angle at which the cursor moves, and is supplied with a chip select signal by the output of the address decoder 20. Also, it is connected to the data bus DB, and the Read/Write signal line R
Data transfer with the processor 10 is controlled by a signal from /W.

60 is a horizontal cursor register, and 70 is a vertical cursor register, and these registers can also be accessed from the processor IOK. Horizontal cursor register row 0
The output CX of the vertical cursor register 70 and the output CY of the vertical cursor register 70 are supplied to a coincidence circuit 8o, and a timing control circuit 90 described later.
The output 95 of the character counter and the output 99 of the line counter are matched, and when they match, a cursor display signal 85 is generated. Further, 100 is an address converter, which converts the two-dimensional address of the output 95 of the character counter and the output 99 of the line counter into a one-dimensional address.

Details of the timing control circuit 90 are shown in FIG. In the figure, 91 is a clock oscillator, 93 is a dot counter that defines the number of horizontal dots in one character section, and 94 is a character counter that defines the number of characters on one horizontal scanning line. 96 is a raster counter that defines the number of vertical dots in one character block, and 9Elj is a line counter that defines the number of lines in one frame. In addition, the oscillator 91
The output 92 of
It is also used as a zero shift pulse. The output 95 of the character counter 94 and the output 99 of the line counter 98 are used as a coincidence signal with the cursor register, and
The address converter 100 converts it into a one-dimensional address and outputs it as an output 105, and the refresh memory 110
is supplied as a read address for display data.

As a result, the character code 115 at the specified address is read from the refresh memory 110 and supplied to the character generator 120. In addition to the character code 115, the character generator 120 is supplied with the output 97 of the raster kakunta 96, reads out the character pattern 125 of the designated line of the designated character code, and converts this into a parallel-to-serial converter. 130 into a serial video signal 135, which is displayed on a CRT display 150 via a mixer 140. Mixer 14 (
1: A cursor display signal 85 is mixed with the serial video signal 135 to display a cursor.

Reference numeral 160 denotes the angle function switch (see FIG. 1 and 2), and when this is operated, an interrupt signal 165 is sent to the processor 10, and the angle data is read into the processor 10 via the data bus DB. 170 is the function switch for moving the cursor (see Fig. 1, 3.4-.5.6); when this switch is pressed, an interrupt signal is sent, and the processor moves the cursor in a specified angular direction, as will be described later. Movement control is performed. In the apparatus of this embodiment configured as described above, the operation when the cursor movement angle is designated by the angle function switch 160 and the cursor movement function switch 170 is pressed will be described below.

FIG. 5 is a flowchart of the above operation, and FIG. 6 is an explanatory diagram of the algorithm for moving the cursor. In the following description, CX: Contents of the horizontal cursor register 60 CY: Contents of the vertical cursor register 70 TH The contents of the two-angle register 50 are assumed to be the current cursor position lll-1(,n). That is, m: horizontal position (=CX) n: vertical position (=CY), and DX and DY are the unit interval lengths of the vertical grid line and the horizontal grid line, respectively.

When the angle function switch 2 (160) is set to TH and the movement function switch 3 or 4 is pressed, the processor 10 loads a program for the following processing from the ROM 30 and moves the cursor in the direction of the angle TH. Perform the process of moving it to .

(1) Read the current cursor position CX, CY.

(3) Read the set angle TH.

(3) Determine whether a straight line extended from the current cursor position at an angle TH intersects with more horizontal grid lines or vertical grid lines. Judgment conditions are tanTH and DY/
DX, tanTH≦DY/DX
If so, it will intersect with the vertical grid lines more often. In the following, a case will be described in which the vertical grid lines intersect a large number of times, but the same applies to a case where the horizontal grid lines intersect a large number of times.

(4) Find the Y coordinate Y of the intersection of the vertical grid line adjacent to the current cursor position and the straight line at the angle TH using the following equation.

Y” n-DY+DX @ tan TH (5) (4
) is located between which horizontal grid lines, counting from the horizontal grid line at the current cursor position. This judgment condition is that the Y coordinate of the intersection point is +
It is assumed that it is between the first horizontal grid lines, and (n+k)DY)Y≧(-1 to n+)DY.

(6) Set the new cursor position in the cursor position register as follows.

CX = m + 1 CY = n + k-1 As shown in Fig. 6, the cursor moves on the designated angle along the near a or more @ line (marked with a circle in the figure). Note that similar processing is performed in the case of <, tan TH) DY/DX as described above.

〔Effect of the invention〕

As described above, according to the present invention, in a CRT display device in which the movement of a cursor is controlled by a processor, there is provided an angle function switch that specifies the movement angle of the cursor, and movement of both at the angle specified by the switch. and an angle register that can be read and written by the processor, and the grosser takes in the contents of the angle register to control the movement of the cursor, so the cursor can be directly moved diagonally. This has the remarkable effect of realizing an inexpensive cursor control method.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a diagram showing a cursor movement situation, FIG. 3 is a block diagram showing details of the embodiment device, and FIG. 4 is a timing control circuit diagram thereof. Detailed diagram, Figure 5 is a program flowchart of processing, Figure 6 is a detailed diagram.
The figure is an explanatory diagram of an algorithm for cursor movement. 2(160)...Function switch for angle, 3,4,5°6(170)...Function switch for movement, 10...Processor, 20...Address decoder, 30...R
OM. 50...Angle register, 60...Horizontal cursor register, 70...Vertical cursor register, 80...-
Several circuits, 90...timing control circuit, 100...
Address conversion L1xo...Refresh memory, 12
0...Character generator, 130...Parallel/serial converter, 140...Mixer, 150...
・CR, T Figure 5 Figure 6 X

Claims (1)

[Claims] 1. C where the movement of deer cranes is controlled by a processor
The RT display device is provided with an angle function switch for specifying a movement angle of the cursor, a switch for specifying bidirectional movement at the angle specified by the switch, and an angle register readable and writable by the processor, A cursor control method characterized in that the processor reads the contents of an angle register to control movement of the cursor.