JPH02189619A - Position coordinate input system - Google Patents

Abstract

PURPOSE:To move a cursor on a CRT screen and to input three-dimensional position information by providing the input system with a means capable of changing only the (x, y) coordinates by moving the cursor on the CRT screen, a means capable of changing only the z coordinate and a means for switching those two means. CONSTITUTION:A mode switching circuit 2 determines whether the output data from a mouse 1 can be outputted as the data of the (x, y) coordinates or as the data of the z coordinate in accordance with the button information of the mouse 1. An (x, y) output circuit 3 transforms the moving variable of the mouse 1 into (x, y) coordinates and stores the transformed value in a three-dimensional data storing register 5 as an output value and a (z) output circuit 4 transforms the moving variable of the mouse 1 into the (z) coordinate and stores the transformed value in the register 5 as an output value. Thereby, a perspective projection display circuit 7 knows the three-dimensional coordinate position of the current mouse cursor from the contents of the register 5, transforms the mouse cursor shape data of a mouse cursor shape data storing register 6 into two-dimensional coordinate data and displays the data on the CRT 8 as the mouse cursor shape in the three-dimensional coordinates.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cursor control method on a CR7 screen, and particularly to a position coordinate input method in an orthogonal coordinate system [Prior Art] Conventionally, this type of cursor was used. The position coordinate input method is
A common method was to input position coordinates by moving a fixed-shaped cursor on the screen according to keyboard or mouse input and specifying the position on the screen.

[Problem to be solved by the invention]

In the above-described conventional position coordinate input method using a cursor, the cursor is displayed on two-dimensional coordinates on the CR7 screen, and position coordinate input by pointing can only input two-dimensional position coordinates on the CR7 screen.

Therefore, there is a drawback that, for example, three-dimensional graphic data cannot be created by inputting by pointing a cursor on a CRT screen.

[Means to solve the problem]

In the position coordinate input method of the present invention, the Z coordinate according to the three-dimensional orthogonal coordinate system expressed as (xy yy z) on the screen of the screen display device is constant, and only the (xt y) coordinates are changed by moving the cursor. and set that value as the first output value (xt y
) output circuit, a 2-output circuit whose (xt y) coordinates are constant and only the Z coordinate is changed by movement of the cursor, and that value is set as a second output value; and the (x, y) output circuit, 2 outputs. a mode switching circuit that selectively operates the circuit;
．． a three-dimensional data storage register that stores a second output value;
A mouse cursor shape data storage register that stores shape data for displaying the cursor in a two-dimensional shape on the screen, and data in the mouse cursor shape data storage register to data stored in the three-dimensional data storage register. and a perspective projection display circuit that performs perspective transformation based on the image data and displays the image on the screen.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

The mouse 1 is a pointing device that performs input while viewing a mouse cursor displayed on the screen of the CRT 8. The mode switching circuit 2 determines whether the output data from the mouse 1 is to be output as (xyy) coordinate data or as Z coordinate data, based on the button information of the mouse 1. The (xy y) output circuit 3 outputs the amount of movement of the mouse 1 by (
x, y) coordinates and stored in the three-dimensional data storage register 5 as an output value. The two-output circuit 4 converts the amount of movement of the mouse 1 into two coordinates and stores it in the three-dimensional data storage register 5 as an output value. The mouse cursor shape data storage register 6 stores in advance the shape data of the mouse cursor displayed on the screen of the CRT 8. The perspective projection display circuit 7 learns the current three-dimensional coordinate position of the mouse cursor from the three-dimensional data storage register 5 and converts the mouse cursor shape data in the mouse cursor shape data storage register 6 into the current three-dimensional position information where the mouse cursor is located. Based on the above, it is converted into two-dimensional coordinate data on the screen using perspective projection method, and the shape of the mouse cursor at that three-dimensional coordinate is displayed on the CRT8.
to be displayed.

FIG. 2 is a flowchart showing the operation of FIG. 1. Step 2
1, movement information is obtained by operating mouse 1.

When the user inputs button press information, etc., the mode switching circuit 2 determines whether the current input mode is the (xty) coordinate input mode or the Z coordinate input mode in step 2.
2, check (xty) output circuit 3 or 2
In step 23, the movement information output by the mouse 1 is passed to either one of the output circuits 4, and the mode of both is switched by the button information of the mouse 1.
t y) The output circuit 3 converts the movement information output from the mouse 1 into (xyy) coordinates and outputs it, and in step 24, the 2 output circuit 4 converts the movement information output from the mouse 1 into 2
Convert to coordinates and output. In step 25, the three-dimensional coordinate data converted in step 23 or step 24 is stored in the three-dimensional data storage register 5, respectively. In step 26, the perspective projection display circuit 7
According to the three-dimensional position coordinates stored in the three-dimensional data storage register 5, the mouse cursor shape data storage register 6
The cursor shape data stored in is subjected to perspective projection transformation and displayed on the screen of the CRT 8.

〔Effect of the invention〕

As explained above, the present invention provides means for changing only the (xt y) coordinates by moving a cursor on a CRT screen;
By having a means that can change only the zpjl mark and a means that switches between these two means, the three-dimensional position coordinates can be determined from the CRT screen coordinates where the cursor moves, and the shape of the cursor can also be changed based on the current three-dimensional position information. Since it has means for displaying perspective projection from the CRT screen, it is possible to input three-dimensional position information by moving a cursor on the CRT screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of FIG. 1. 1...Mouse, 2...Mode switching circuit, 3...(
x ty) output circuit, 4...2 output circuit, 5...3
Dimensional data storage register, 6... Mouse cursor shape data storage register, 7... Perspective projection display circuit 8.
...CRT.

Claims (1)

[Claims] The z coordinate in the three-dimensional orthogonal coordinate system represented by (x, y, z) on the screen of the screen display device is constant, and only the (x, y) coordinate is changed by moving the cursor, and its value is changed to the first an (x, y) output circuit that outputs an output value; a z output circuit that has constant (x, y) coordinates and changes only the z coordinate by moving the cursor and uses that value as a second output value; x, y) an output circuit; a mode switching circuit that selectively operates the two output circuits; a three-dimensional data storage register that stores the first and second output values; A mouse cursor shape data storage register that stores shape data for display on the screen, and a perspective transformation of the data in the mouse cursor shape data storage register based on the data stored in the three-dimensional data storage register and display on the screen. A position coordinate input method characterized by comprising a perspective projection display circuit for displaying.