JPH05324793A - Cursor display system for graphic processing system - Google Patents

Abstract

PURPOSE:To clearly display the X, Y and Z axis directions on the like in the world coordinate space with the three-dimensional graphic for display defined by means of a cursor to an operator. CONSTITUTION:A coordinate conversion direction receiving means 11 receives the coordinate conversion direction specifying the coordinate conversion from the world coordinate to the physical coordinate on the three-dimensional graphic for display. A cursor shape calculating means 12 calculates the cursor shape consisting of line segment groups parallel to the X, Y, and Z axes in the world coordinate space projected on the projection surface from the view point based on the coordinate conversion direction. A coordinate value reading means 14 reads the coordinate value specified from a coordinate value input device 3. A cursor display means 15 displays the cursor (whose shape is stored in the cursor shape storage means 13) calculated by the cursor shape calculating means 12 at the location of the coordinate value read by the coordinate value reading means 14 in the screen of the display device 4.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a display device (CRT (C
A cursor on the screen of a display device in a graphic processing system that displays a two-dimensional graphic (hereinafter, referred to as a two-dimensionalized three-dimensional graphic) corresponding to a three-dimensional graphic to be displayed on the screen of an atode Ray Tube) display device, etc. The present invention relates to a cursor display method in a graphic processing system for displaying a screen.

[0002]

2. Description of the Related Art Conventionally, in a cursor display method in this type of graphic processing system, a two-dimensional cursor such as an arrow or a cross is displayed (see FIG. 3).

In a figure processing system for displaying a two-dimensionalized three-dimensional figure on a screen of a display device, a world coordinate space (a three-dimensional figure is defined as an X coordinate and a Y coordinate) in which a three-dimensional figure to be displayed is defined. In order to express the X-axis, the Y-axis and the Z-axis in a three-dimensional space (which is logically defined by Z and Z coordinates) on the screen of the display device, 3
In addition to the three-dimensional figure, a line segment group called "guide" (a line segment group showing the X axis, the Y axis, and the Z axis in the world coordinate space projected from the viewpoint onto the projection surface; see FIG. 3) was displayed.

[0004]

In the conventional cursor display method in the above-described graphic processing system, a two-dimensional cursor such as an arrow or a cross is displayed (the world in which the three-dimensional graphic to be displayed is defined). X in coordinate space
Since information about axes, Y-axis, and Z-axis is not added to the cursor), the direction of the X-axis, Y-axis, and Z-axis in the world coordinate space is displayed in order to clearly indicate to the operator on the screen of the display device. The guide must be displayed separately from the two-dimensionalized three-dimensional figure corresponding to the target three-dimensional figure, and for the figure processing system other than the line segment of the two-dimensionalized three-dimensional figure corresponding to the three-dimensional figure to be displayed. There is a drawback that extra line segments need to be displayed.

In view of the above points, an object of the present invention is to determine the directions of the X-axis, Y-axis, and Z-axis in the world coordinate space in which the three-dimensional figure to be displayed is defined by the cursor on the screen of the display device. It is an object of the present invention to provide a cursor display method in a graphic processing system that can be clearly indicated to an operator by the cursor shape (for the operator, the direction of the X axis, the Y axis, and the Z axis can be determined only by the cursor shape).

[0006]

The cursor display method in the graphic processing system according to the present invention is provided on the screen of the display device.
In a figure processing system for displaying a three-dimensional figure, a coordinate transformation instruction receiving means for receiving a coordinate transformation instruction for instructing coordinate transformation from a world coordinate to a physical coordinate relating to a three-dimensional figure to be displayed, and a coordinate transformation instruction receiving means. Cursor shape calculation means for calculating a cursor shape composed of line segments parallel to the X axis, Y axis, and Z axis in the world coordinate space projected from the viewpoint onto the projection surface based on the coordinate conversion instruction received by the means; Coordinate value reading means for reading the coordinate value indicated by the coordinate value input device, and a cursor having a cursor shape calculated by the cursor shape calculating means at the position of the coordinate value read by the coordinate value reading means on the screen of the display device. And a cursor display means for displaying.

[0007]

In the cursor display method in the graphic processing system of the present invention, the coordinate conversion instruction receiving means receives the coordinate conversion instruction for instructing the coordinate conversion from the world coordinates to the physical coordinates of the three-dimensional figure to be displayed, and calculates the cursor shape. Based on the coordinate conversion instruction received by the coordinate conversion instruction receiving means, the means calculates a cursor shape including a group of line segments parallel to the X axis, Y axis, and Z axis in the world coordinate space projected from the viewpoint onto the projection surface. The coordinate value reading means reads the coordinate value designated by the coordinate value input device, and the cursor display means is a cursor calculated by the cursor shape calculating means at the position of the coordinate value read by the coordinate value reading means on the screen of the display device. Display the shape cursor.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a cursor display system in the graphic processing system of the present invention. The cursor display method in the graphic processing system of the present embodiment is the user program 1, the operator 2 (the operator 2 gives an instruction to the coordinate conversion instruction receiving means 11 to refer to the screen of the display device 4), and the coordinate value input. Device 3 (mouse or tablet, etc.) and display device 4
(CRT display device, etc.) and coordinate conversion instruction receiving means 11
The cursor shape calculation means 12, the cursor shape storage means 13, the coordinate value reading means 14, the cursor display means 15, and the three-dimensional figure rendering means 21 are included. The coordinate conversion instruction receiving means 11, the cursor shape calculating means 12, the cursor shape storing means 13, the coordinate value reading means 14, and the cursor displaying means 15 are included in the cursor control unit 10. Also, the cursor control unit 1
The 0 and 3D graphic rendering means 21 are included in the 3D graphic processing section 20 (the coordinate conversion instruction receiving means 11 is provided both in the cursor control section 10 and in the 3D graphic processing section 20 other than the cursor control section 10). included).

FIG. 2 is a diagram showing an example of a mode of defining a three-dimensional figure or the like in the world coordinate space. As shown in FIG. 2, in order to display a three-dimensional figure defined in the world coordinate space on the screen of the display device 4, the coordinates between the world coordinate space and the physical coordinate space related to the display device 4 are displayed. In order to perform the conversion), it is necessary to define the viewpoint and the projection plane (specify the positions of the two). The physical coordinate space means a display device (here, display device 4) for displaying a two-dimensionalized three-dimensional figure.
A two-dimensional space corresponding to the pixels of the screen.

FIG. 3 is a diagram for explaining the display of a cursor by the cursor display method in the conventional graphic processing system.

FIG. 4 is a diagram for explaining the display of the cursor by the cursor display method in the graphic processing system of this embodiment.

FIGS. 5A to 5E are views showing specific examples of types of cursors displayed in the cursor display system in the graphic processing system of this embodiment.

Next, the operation of the cursor display system in the graphic processing system of the present embodiment thus constructed will be described.

The three-dimensional figure rendering means 21 in the three-dimensional figure processing unit 20 stores the three-dimensional figure defined in the world coordinate space (this three-dimensional figure is defined by the user program 1). The world coordinates indicating the position and the shape are received from the user program 1, and the coordinate conversion instruction (information for specifying the viewpoint and the projection plane necessary for performing the coordinate conversion from the world coordinates to the physical coordinates related to the display device 4) is received. The instruction including the coordinate conversion) is received from the user program 1 or the operator 2 via the coordinate conversion instruction receiving means 11.

The three-dimensional figure rendering means 21 performs coordinate conversion on the three-dimensional figure based on the world coordinates indicating the position and shape of the three-dimensional figure to be displayed and the coordinate conversion instruction (from the world coordinates to the physics relating to the display device 4). The coordinate conversion is performed), and the three-dimensional figure after the coordinate conversion (two-dimensionalized three-dimensional figure) is displayed on the screen of the display device 4.

The processing of the three-dimensional rendering means 21 as described above is the same as in the prior art.

When the two-dimensionalized three-dimensional figure is displayed as described above, the operator who is looking at the screen of the display device 4 in the directions of the X-axis, Y-axis and Z-axis in the world coordinate space. As will be readily understood from 2, the cursor control unit 10 displays the cursor reflecting the direction of each axis and the like on the screen of the display device 4 as shown in the following (1) to (3).

The coordinate conversion instruction receiving means 11 in the cursor control unit 10 receives the above-mentioned coordinate conversion instruction from the user program 1 or the operator 2.

The cursor shape calculation means 12 is based on the coordinate conversion instruction received by the coordinate conversion instruction receiving means 11 and projected from the viewpoint (viewpoint specified by the coordinate conversion instruction) to the projection surface (projection specified by the coordinate conversion instruction). A shape of a cursor that has information such as the direction of the line segment group obtained by finding a line segment group parallel to the X-axis, Y-axis, and Z-axis (three line segments corresponding to the three axes) in the world coordinate space Is generated (calculated) and the cursor shape is temporarily stored in the cursor shape storage unit 13. Note that the information indicating the type of cursor that is a prerequisite for calculating the cursor shape is
It is set in advance in the cursor shape calculation means 12 (when a plurality of types of cursors are set, the type is specified by the user program 1 or the operator 2).

On the other hand, the coordinate value reading means 14 reads the coordinate value at which the cursor should be displayed based on an instruction from the coordinate value input device 3 such as a mouse or a tablet (the reading by the coordinate value reading means 14 is always performed. Exist).

The cursor display means 15 has predetermined coordinate values (coordinate values read by the coordinate value reading means 14 on the screen of the display device 4 based on the cursor shape currently stored in the cursor shape storage means 13. The cursor (cursor having the above-mentioned cursor shape) is displayed at the position ().

Next, with reference to FIGS. 2 to 4, the operation relating to the display of the three-dimensional figure (two-dimensionalized three-dimensional figure) after the coordinate conversion and the cursor will be described with reference to the prior art and the figure processing system of the present embodiment. The description will be made by comparing with the technique relating to the cursor display method in FIG.

Here, it is assumed that a rectangular parallelepiped three-dimensional figure is defined in the world coordinate space as shown in FIG. 2, and a viewpoint and a projection plane are defined (specified) as shown in FIG. ..

A conventional graphic processing system (a graphic processing system according to the conventional "cursor display method in a graphic processing system") is based on the world coordinates of the rectangular parallelepiped shown in FIG. 2 and the position of the viewpoint and the projection plane. 2 corresponding to
A three-dimensional figure is displayed as shown in FIG.

The conventional cursor display method in the graphic processing system displays the cursor as shown in FIG. 3 together with the above-mentioned two-dimensionalized three-dimensional graphic. It should be noted that the cursor does not include information about the X axis, the Y axis, and the Z axis in the world coordinate space.

Thus, the cursor displayed by the cursor display system in the conventional graphic processing system has an X
Since information about the axes, Y-axis, and Z-axis is not added, X in the world coordinate space in which the rectangular parallelepiped is defined
In order to notify the operator of the directions of the axes such as the axes, the Y-axis, and the Z-axis, the conventional graphic processing system must display the two-dimensionalized three-dimensional graphic corresponding to the rectangular parallelepiped separately. did not become. That is, the conventional graphic processing system uses the X in the world coordinate space as shown in FIG.
Axis, Y-axis and Z-axis (the coordinate axis consisting of the X-axis, Y-axis and Z-axis is also one of the three-dimensional figures) coordinate conversion (similar to the coordinate conversion for the original three-dimensional figure (cuboid) to be displayed). (Coordinate conversion) is performed, and a guide as shown in FIG. 3 (a guide is also one of the two-dimensionalized three-dimensional figures) is displayed on the screen separately from the two-dimensionalized three-dimensional figure corresponding to the rectangular parallelepiped to be displayed. Had to do.

On the other hand, the cursor display method in the graphic processing system of the present embodiment, as described above, depends on the cursor shape of the cursor on the screen of the display device 4, the X axis, the Y axis and the Z axis in the world coordinate space. The direction of the axis, etc. can be indicated (see FIG. 4). Therefore, the operator 2 can determine the directions of the X-axis, Y-axis, and Z-axis in the world coordinate space based on the cursor shape, and the graphic processing system is a special two-dimensional three-dimensional like a guide in the prior art. Eliminates the need to display shapes.

Finally, the cursor (3 displayed by the cursor display method in the graphic processing system of the present embodiment is displayed.
A specific example of the type of dimensional cursor) will be described.

As specific examples of the three-dimensional type of cursor, those shown in FIGS. 4 and 5A to 5E are conceivable.

The cursor in FIG. 4 is X-shaped by adding a figure showing a cone to the end points in the positive direction of the line segment showing the Y-axis.
It is a cursor that distinguishes the axis, the Y axis, and the Z axis. In addition,
The cursor shown in FIG. 5 (a) is a cursor when the positive direction of the line segment showing the Y axis in the cursor in FIG. 4 is directed to the front of the screen, and the cursor shown in FIG. 5 (b) is the cursor in FIG. This is a cursor when the positive direction of the line segment showing the Y axis in the cursor is directed to the opposite side of the screen.

The cursor shown in FIG. 5C is a cursor that distinguishes the X-axis, the Y-axis and the Z-axis by the character notation (notation "X", "Y" and "Z").

The cursor shown in FIG. 5D is a cursor that distinguishes the X-axis, the Y-axis, and the Z-axis by the length of the line segment.

The cursor shown in FIG. 5E is a cursor having line segments extending in the positive and negative directions of the X-axis, the Y-axis and the Z-axis, respectively, and is a cone at the positive end point of the line segment showing the Y-axis. X-axis, Y-axis and Z
A cursor that distinguishes between axes.

If necessary, the various cursors described above can be combined (eg, FIG. 5).
It has a character notation as shown in (c), and FIG.
It is also possible to set a cursor having a distinction between the X axis, the Y axis and the Z axis according to the length as shown in (d)).

[0036]

As described above, according to the present invention, the X in the world coordinate space in which the three-dimensional figure to be displayed is defined.
By clearly indicating the directions of the axes, the Y-axis, and the Z-axis to the operator by the cursor shape of the cursor on the screen of the display device, the operator can determine the directions of the X-axis, the Y-axis, the Z-axis, etc. only by the cursor shape. Become possible,
For the graphic processing system, there is an effect that it becomes unnecessary to display an extra line segment other than the line segment for expressing the original three-dimensional graphic to be displayed.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an example of an aspect of definition of a three-dimensional figure or the like in the world coordinate space.

FIG. 3 is a diagram for explaining display of a cursor by a cursor display method in a conventional graphic processing system.

4 is a diagram for explaining display of a cursor by a cursor display method in the graphic processing system shown in FIG.

5 is a diagram showing a specific example of types of cursors displayed in the cursor display method in the graphic processing system shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 User program 2 Operator 3 Coordinate value input device 4 Display device 10 Cursor control section 11 Coordinate conversion instruction receiving means 12 Cursor shape calculation means 13 Cursor shape storage means 14 Coordinate value reading means 15 Cursor display means 20 Three-dimensional figure processing section 21 3D graphic rendering means

Claims (1)

[Claims] 1. A graphic processing system for displaying a two-dimensionalized three-dimensional graphic on a screen of a display device, wherein a coordinate conversion instruction for instructing coordinate conversion from world coordinates to physical coordinates of a three-dimensional graphic to be displayed is received. From the coordinate conversion instruction receiving means and the line segment group parallel to the X-axis, Y-axis, and Z-axis in the world coordinate space projected on the projection surface from the viewpoint based on the coordinate conversion instruction received by the coordinate conversion instruction receiving means. Cursor shape calculation means for calculating the cursor shape, coordinate value reading means for reading the coordinate values designated by the coordinate value input device, and the coordinate value reading means for reading the coordinate values on the screen of the display device. Graphic processing having cursor display means for displaying a cursor having a cursor shape calculated by the cursor shape calculation means Cursor display method in the system.