JPH07222865A - Electronic play device - Google Patents

Abstract

PURPOSE:To easily grasp the positional relation of characters by transforming a two-dimensional coordinate into coordinate where a two-dimensional plane is rotated by a specified angle with respect to the direction of a visual point so as to be expressed, when an object scene expressed by a three-dimensional coordinate is to be expressed by the two-dimensional coordinate. CONSTITUTION:A display means 9 expressing a field surface 12 partitioned by an express frame 11 for a street basket which is seen through so as to be projected into a two-dimensional plane, is designed to express an object scene expressed by a three-dimensional coordinate based on two dimensional data which can be obtained in such a way that the object scene expressed by the three dimensional coordinate is seen through from the front so as to be projected into a two-dimensional plane with respect to a visual point 0, and subsequently allows the two-dimensional plane thus obtained to be furthermore rotated by an angle theta so as to be transformed. Besides, player's character 13 acting as a sprite operated and moved by a player are also indicated in the display means 9. Expression as mentioned above looks like an oblique observation of the field surface on the part of the player, and makes it easy to accurately grasp positional relation in the depth direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic game device.
In particular, the present invention relates to an electronic amusement device for displaying two-dimensional coordinate data obtained by perspectively projecting a target screen represented by three-dimensional coordinates on a two-dimensional plane by further rotating it by an angle θ.

[0002]

2. Description of the Related Art FIG. 6 shows an example of an electronic game device shown in a two-dimensional plane, showing a street basket as an example.

In the example shown in FIG. 6, the field surface of the street basket is two-dimensionally displayed in an obliquely observed form. In FIG. 6, 60 is the field surface of this street basket, and 61 is a sprite whose movement is controlled by a player who plays a basket game displaying the basket.
That is, the player character.

In the game device represented by the two-dimensional plane as described above, the positional relationship can be generally understood, but there is a problem that it is not realistic.

Further, a sense of discomfort is felt in the moving direction of the character 61 on the screen and the operating direction of the player.

On the other hand, FIG. 7 shows an example in which the target scene is displayed as three-dimensional data, this is perspectively projected onto a two-dimensional plane, and the obtained two-dimensional data is displayed on the two-dimensional plane.

In FIG. 7, 9 is a display screen frame of the display device, and 60 is a field surface 60 of which a street basket is an example.

In this case, the viewpoint 0 is placed in front of the target screen represented by the three-dimensional coordinates and the converted data is displayed.

In the case of this example, compared with the example of FIG. 6, there is a problem that a force is felt but it is difficult to understand the positional relationship in the depth direction.

A method for obtaining two-dimensional data for display will be further described with reference to FIG. 8 by taking FIG. 7 as an example.

In FIG. 8, a point P is a three-dimensional coordinate (x, y,
z). By perspectively projecting this point onto the projection plane 44, which is a two-dimensional plane, from the viewpoint 0, a projection point P ′ (X, Y, Z) on the two-dimensional plane is obtained.

The two-dimensional coordinate data obtained by perspectively projecting the target scene represented by the three-dimensional coordinates on the two-dimensional projection surface 44 by the method as shown in FIG. 8 is input to the display device for display.

FIG. 9 shows an example of the display surface of the display device displayed based on the two-dimensional data obtained by projecting the three-dimensional coordinates on the two-dimensional projection surface 44 in this way.

In FIG. 9, 9 is a display frame of the display device, 0 is a viewpoint, and 30 is a viewing angle from which the projection plane 44 is desired.

[0015]

When the target scene represented by the three-dimensional coordinates is converted into the two-dimensional coordinates and displayed on the display device as described above, there is power as described above, but the position in the depth direction is large. The relationship was difficult to understand.

That is, in the conventional method, the viewpoint 0 is arranged in front of the target scene, and the target scene represented by the two-dimensional coordinates is perspectively projected on the two-dimensional plane. Therefore, there is a problem that the positional relationship in the depth direction is difficult to understand.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electronic game device which solves such a conventional problem.

[0018]

An electronic game device according to the present invention has a ROM for storing a game program, a CPU for controlling execution of the game program, and a display device.

Then, the game program includes two-dimensional coordinate data obtained by perspectively projecting a target scene represented by three-dimensional coordinates onto a two-dimensional plane from a predetermined viewpoint in the front direction,
The CP has a conversion parameter for converting the two-dimensional coordinate data into coordinates rotated by an angle θ with respect to the direction of the viewpoint.
The U converts the two-dimensional coordinate data according to this conversion parameter and displays it on the display device.

Further, in a specific aspect of the present invention, the target scene represented by the three-dimensional coordinates is a game field of a street basket.

In still another mode, the display device has a pair of display surfaces, and the conversion parameter for converting the two-dimensional plane into coordinates inclined by an angle θ is an angle in the same direction as the rotation of the timepiece. It has a first conversion parameter for converting into a coordinate rotated by θ, and a second conversion parameter for converting the coordinate of the two-dimensional plane rotated by an angle θ in a direction opposite to the rotation of the timepiece.

The CPU converts the two-dimensional coordinate data according to the first and second conversion parameters, and displays the converted two-dimensional coordinate data on the display device on the pair of display surfaces. I am trying.

[0023]

In the present invention, the two-dimensional data obtained by perspectively projecting the target scene represented by the three-dimensional coordinates on the two-dimensional plane is converted to further rotate by the angle θ and then displayed on the display device.

Therefore, in the present invention, the figure displayed on the display device, which is more powerful and is displayed by rotating the two-dimensional coordinate of the predetermined angle θ, is displayed by the same expression as when the field surface is observed obliquely. To be done. Therefore, the positional relationship in the depth direction becomes easier to understand.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, and a street basket game will be described as an example. According to the present invention, two-dimensional data obtained by perspectively projecting a target scene represented by three-dimensional coordinates from the front to a two-dimensional plane with respect to a viewpoint 0 and further transforming the two-dimensional plane by θ rotation are obtained. It is displayed on the display device based on the data.

In FIG. 1, 11 is a field surface 12 of the street basket which is perspectively projected on the two-dimensional plane.
Is a display frame of a display device for displaying.

As shown in FIG. 1, it is further rotated by an angle θ with respect to the direction from the viewpoint 0 to the two-dimensional plane. It should be noted that in FIG. 1, reference numeral 30 denotes a viewing angle at which a two-dimensional plane is desired from the viewpoint 0.

FIG. 2 shows the display surface of the display device based on the two-dimensional data obtained by rotating the angle θ in this way.

In FIG. 2, 9 is a display surface of the display device, and 12 is a field surface of the street basket.

Further, 13 is a character of the player, which is a sprite operated and moved by the player. The field surface 1 to be displayed as shown by FIG.
2 is inclined, and the player feels as if he or she is observing the field surface from an oblique direction.

FIG. 3 is a block diagram showing an example of an embodiment apparatus to which the present invention is applied. In FIG. 3, 1 is a CPU, R
The game program stored in the OM2 is executed and controlled.

The devices described below are connected via a common bus 10. Reference numeral 3 denotes a RAM, which is a work storage device for temporarily storing data in the course of game execution.

Reference numeral 4 denotes an input device, which is an input device operated by a player such as an input pad or a joystick.

Reference numeral 5 denotes a video RAM, which is a memory for temporarily storing a digital video signal obtained in the process of executing the game program by the CPU 1.

A video display processor 6 is controlled by the CPU 1 and controls to sequentially transfer and store the digital video signals stored in the video RAM 5 to the field buffer memory 7.

The field buffer memory 7 has a memory capacity for one screen, the digital video signal stored in the video RAM 5 is sequentially stored by the video display processor 6 for one screen, and further output to the video display processor 6 in sequence. Have the function to

The video signal generation circuit 8 is a circuit for converting the digital video signal from the field buffer memory 7 into an analog video signal and outputting it. A display device 9 displays an analog video signal from the video signal generation circuit 8.

In the apparatus of this embodiment, the ROM 2
In the game program stored in, the two-dimensional coordinate data obtained by seeing through the two-dimensional plane the target scene represented by the three-dimensional coordinates from a predetermined viewpoint in the front direction, and the two-dimensional coordinate data from the viewpoint 0 It has a conversion parameter for converting into a coordinate rotated by an angle θ with respect to the direction.

Therefore, the CPU 1 performs a conversion process to convert the two-dimensional coordinate data into data rotated by the angle θ based on the conversion parameter in the process of sequentially reading the game program stored in the ROM 2, and the video RAM 5 is passed through the video display processor 6. To memorize.

The conversion processing of the predetermined angle θ will be further described with reference to FIG. FIG. 4 is a diagram for explaining coordinate conversion using conversion parameters.

In FIG. 4, a point P (x, y) is based on two-dimensional coordinate data obtained by perspectively projecting a target scene represented by three-dimensional coordinates from a predetermined viewpoint 0 in the front direction onto a two-dimensional plane. It represents a certain point P. The coordinates of this point P are (x, y). If this is rotated by an angle θ, the point P '
Move to.

Therefore, the coordinates (X, Y) of the point P'at this time
Is expressed by the following relational expression. That is, X = xcos θ
−ysin θ, Y = x sin θ + y cos θ.

In the above equation, x and y are two-dimensional coordinates of the original point P, and X and Y are points P'when rotated by the angle θ.
Is the two-dimensional coordinate in. Thus, the angle θ is given as the conversion parameter, and C is calculated according to the relation of the above equation.
PU1 performs arithmetic processing.

Here, the angle θ is arbitrary, and the predetermined angle is determined according to the contents of the game program. By doing so, as shown in FIG. 2 described above, for example, the field surface 11 in the street basket game is expressed in a tilted form.

As a result, it is possible to obtain a display in a state of being observed obliquely with respect to the field surface of the street basket (FIG. 9) observed from the front direction.

As a result, the positional relationship of the sprites 13 can be more easily understood and the force of three-dimensional movement can be expressed.

FIG. 5 shows another embodiment of the electronic play apparatus according to the present invention. FIG. 5 shows the external appearance of such another embodiment device.

In this embodiment, the game device body 2
2 has a guide display panel 21 in the upper part, and has a pair of display screens 90 and 91 below it. Further, operation panels 22 and 24 are provided corresponding to the display screens 90 and 91, respectively.

Further, joysticks 23 and 25 are provided corresponding to the display panels 22 and 24.

In this embodiment, a pair of display surfaces 90,
It has 91 and allows two players to play at the same time.

Further, in the pair of display surfaces 90 and 91, in the case of a street basket game, for example, field surfaces observed from diagonal positions in opposite directions are displayed.

Therefore, when two more players play, it is felt that they are participating in the game street basket at the opposite positions.

Then, on the pair of display surfaces 90 and 91,
In order to obtain the display screens that are symmetrically observed from the opposite directions, the above-mentioned angle θ is not rotated in one direction but the conversion parameter for converting the two-dimensional plane into the coordinates obtained by rotating the two-dimensional plane by the angle θ. Have a first transformation parameter that transforms the dimensional plane into coordinates that are rotated by the angle θ in the same direction as the rotation of the clock, and a second transformation parameter that transforms coordinates that are rotated by the angle θ in the opposite direction of the rotation of the clock. There is.

As a result, the converted two-dimensional coordinate data converted by the respective parameters become data to be displayed in a state in which the two-dimensional plane is rotated to the positions in the opposite directions.

Therefore, by displaying on the display surfaces 90 and 91 respectively based on the two-dimensional coordinate data converted by these first and second conversion parameters, they were observed from opposite directions as shown in FIG. It is possible to represent the field surface on the display device 9.

[0056]

As described above according to the embodiments, the present invention is two-dimensional coordinate data obtained by perspectively projecting a target scene represented by three-dimensional coordinates from a predetermined viewpoint 0 in the front direction onto a two-dimensional plane. Is converted into two-dimensional coordinate data which is further rotated by a predetermined angle θ and then displayed on the display device 9.

As a result, it is possible to provide an electronic game device in which the positional relationship of the displayed characters can be understood more easily and the force of three-dimensional movement can be expressed, as compared with the conventional electronic game device.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 shows an example of a screen displayed on the display device based on the principle of FIG.

FIG. 3 is a block diagram of an embodiment apparatus to which the present invention is applied.

FIG. 4 is a diagram illustrating coordinate conversion when rotating two-dimensional plane data by an angle θ.

FIG. 5 is another embodiment of the present invention, which is an example having a pair of display surfaces.

FIG. 6 is a diagram showing an example of a display in a conventional electronic game device.

FIG. 7 is a diagram showing another example of a display of a conventional electronic game device.

FIG. 8 is a diagram illustrating a general method of perspectively projecting a target scene represented by three-dimensional coordinates onto a two-dimensional plane to obtain two-dimensional coordinate data.

9 is a diagram showing an example of a display surface displayed by the two-dimensional coordinate data obtained by the method of FIG.

[Explanation of symbols]

1 CPU 2 ROM 3 RAM 4 Input Device 5 VRAM 6 Video Display Processor 7 Field Buffer Memory 8 Video Signal Generation Circuit 9 Display Device 10 Common Bus 11 Street Basket Field Surface 12 Character and Player in Game 20 Game Device Main Body 21 Display panel 22,24 Operation panel 23,25 Input operation device 90,91 A pair of display surfaces

Claims (4)

[Claims] 1. An electronic game device for displaying on a display surface two-dimensional coordinates obtained by perspectively projecting a target scene represented by three-dimensional coordinates onto a two-dimensional plane from a predetermined viewpoint (0) in the front direction. An electronic game device, characterized in that the two-dimensional coordinates are converted into coordinates obtained by rotating the two-dimensional plane by an angle θ with respect to the direction of the viewpoint (0) and displayed. 2. A ROM (2) for storing a game program
A CPU (1) for controlling execution of the game program, and a display device (9). The game program has a predetermined viewpoint (0) in front of a target scene represented by three-dimensional coordinates. From the CPU, the CPU has two-dimensional coordinate data obtained by perspective projection onto a two-dimensional plane, and conversion parameters for converting the two-dimensional coordinate data into coordinates rotated by an angle θ with respect to the direction of the viewpoint (0). 1) is an electronic game device characterized in that the two-dimensional coordinate data is converted by the conversion parameter, and the display device (9) displays the converted two-dimensional coordinate data. 3. The electronic game device according to claim 1, wherein the target scene represented by the three-dimensional coordinates is a game field of a street basket. 4. The display device (9) according to claim 2, wherein the display device (9) has a pair of display surfaces (90,
91), and the conversion parameter for converting the two-dimensional plane into the coordinate inclined by the angle θ is the first conversion parameter for converting the two-dimensional plane into the coordinate rotated by the angle θ in the same direction as the rotation of the timepiece. The CPU (1) has a second conversion parameter for converting a two-dimensional plane into a coordinate rotated by an angle θ in a direction opposite to the rotation of the clock, and the CPU (1) uses the first and second conversion parameters to generate the two-dimensional coordinate data. The display device (9) displays each of the two-dimensional coordinate data converted by the first and second conversion parameters on the pair of display surfaces (90, 91). Electronic play device