JPH07633A - Method for expressing character consisting of connected objects - Google Patents

Abstract

PURPOSE:To express the motion of a character consisting of a plurality of connected objects in a computer game device with less work area. CONSTITUTION:In a method for controlling the motion of a character consisting of a plurality of connected objects in a computer game device, the x, y- coordinates of the i-th object of the objects are determined by the following expressions: xi=xi+(xi-1-xi)/a, yi=yi+(yi-1-yi)/a, wherein xi, yi are the x, y-coordinates of the i-th object, and (a) is a constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for moving a long connected object such as a snake in a computer game device.

[0002]

2. Description of the Related Art Conventionally, in a computer game device, a long display object such as a snake is represented as a complex of a large number of objects. It was necessary to memorize the coordinates of each object. FIG. 1 shows an example.

[0003]

However, when such a method is used, a large number of work areas are required, which causes pressure on the memory. Therefore, in order to reduce the work area, the number of objects has been reduced and the movement patterns have been reduced. As a result, they have been poorly displayed and have been forced to move unnaturally.

The present invention is directed to a method of controlling the movement of a display object consisting of multiple objects that reduces the work area used.

[0005]

[Means for Solving the Problems] It is well known that if the neck of a snake is pressed, the snake cannot move. Similarly to this, when displaying a long character such as a snake, it is the head part that is important. Where your head is is especially important in games. Of course there must be something behind it, but it is often less important than the head.

In particular, if the head part of the movement is determined and the movement behind it is also able to express the "likeness" along it, the entire game can be expressed as a tightness.

Therefore, it suffices if an expression that does not require the whole movement to be prepared in advance in a table as in the conventional case can be made.

Therefore, in the present invention, the following calculation formula representing the movement of a long character is used. x _i = x _i + (x _i-1 −x _i ) / a y _i = y _i + (y _ii −y _i ) / a

Here, x _i and y _i are x and y of the i object.
Coordinates. a is an appropriate constant, and the length of the body is determined to some extent by the value of a.

[0010] Since the x _0, y _0, which corresponds to the head is the part that will determined by the position of the program running, stored in a table in advance. However, it is not necessary to save the contents of all the operations for the objects for i of 1 or more because only the current coordinate values are required.

That is, with the table management as shown in FIG.
Can represent the movement of the character. In FIG. 1, (n + 1) × s ×
While a work area of (length used for coordinates) is required, a work area of {(n + s) × (length used for coordinates)} is required in FIG.

For example, if n = 20, s = 100, and (length used for coordinates) = 4 bytes, the former requires a work area of 8400 bytes, whereas the latter can be covered by a work area of 480 bytes. You can save about 4K bytes of memory.

[0013]

EXAMPLE As an example of the present invention, a random walk comb snake will be taken as an example.

Because of the random walk, the head portion (X ₀ , Y ₀ ) does not have these coordinates in the form of a table, but is determined by a random number. That is,

X ₀ = X ₀ + R _x × X ₀ Y ₀ = Y ₀ + R _y × Y ₀

[0016] Here, R _x and R _y are values determined by random numbers, and are determined each time by a random number table or a random number generation logic. Note that X ₀ and Y ₀ on the right side are the coordinate values used for the previous display.

The coordinates of the i-th object are calculated by using the formula of the present invention: X _i = X _i + (X _i-1 −X _i ) / A Y _i = Y _i + (Y _i-1 −Y _i ) / A

And ask. X _i and Y _i on the right side are the coordinate values used for the previous display, and X _i-1 and Y _i-1 are the newly calculated coordinate values of the previous object. A is an appropriate constant, but it may need to be decided to some extent by trial and error.

FIG. 3 shows a display example when this program is executed with A = 3 and N = 30. Here, N is the number of objects, the top is a square, and the subsequent objects are circles.

FIG. 4 shows an execution example when A = 10 is changed. The distance between objects is increasing.

Further, FIG. 5 shows an execution example when A = 2 and N = 100. The distance between the objects is narrowed, but it is long because the number of objects is 100.

Since the number of tables for storing the coordinates of the objects is 0 to (N-1), there is almost no pressure on the work area due to the increase in the number of objects. This is because the coordinates of the newly displayed object can be calculated.

Moreover, since the head portion is also calculated, it is not necessary to have it in the form of a table in advance in the program.
However, if it is not a random walk, (R _x , R _y ) may be tabulated according to the movement. Of course, the coordinate values of (X ₀ , Y ₀ ) may be tabulated.

FIG. 6 is a flow chart showing the above processing. In the initialization of (X _i , Y _i ), A is also initialized. The calculation of (X ₀ , Y ₀ ) can be obtained by the above random number calculation.
If it is in the form of an initialization table beforehand,
It becomes a value setting from the table, that is, an assignment statement.

[0025]

According to the present invention, a long object such as a snake can be expressed as a natural movement with a simple calculation formula. Moreover, it has become possible to manage a character composed of such a large number of objects in a small work area.

In general, in the case of a computer game machine, there are many restrictions on memory, and such a character could not be realized easily. However, by using the present invention, it can be easily used regardless of the number of objects. effective.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a conventional object coordinate management table.

FIG. 2 is an explanatory diagram showing a coordinate management table when the present invention is used.

FIG. 3 is a diagram showing a character (N is the number of objects) drawn with A = 3 and N = 30 in the embodiment of the present invention.

FIG. 4 is a diagram showing characters (N is the number of objects) drawn with A = 10 and N = 30 in the embodiment of the present invention.

FIG. 5 is a diagram showing a character (N is the number of objects) drawn with A = 2 and N = 100 in the embodiment of the present invention.

FIG. 6 is a flowchart of a processing routine for displaying a character composed of a large number of objects.

Claims (1)

[Claims] 1. A method for controlling the movement of a character consisting of a plurality of connected objects in a computer game device, wherein the xy coordinates of the i-th object of the object are x _i = x _i + (x _i-1 −x _i). ) / A y _i = y _i + (y _ii −y _i ) / a where x _i and y _i are the x and y coordinates of the i object, and a is a constant character consisting of a connected object. Expression method.