JP2008000280A - Shooting game processing method, its device, its program and its recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a determining method of behavior of enemy planes for keeping difficulty levels constant in a shooting game. <P>SOLUTION: In a shooting game processing method, a player's plane and the enemy planes are displayed on a screen, and a player manipulates the player's plane and combats with the enemy planes which shoot attacking ammunition moving in a specified velocity v. A moving direction of the enemy plane, velocity of the enemy plane, and a time interval T between shooting of the attacking ammunition are provided as behavior parameters. A behavior parameter determining means (30) determines a value of one of the three behavior parameters of the enemy plane acting and moving based on the predetermined other two parameters, so that a distance between an attacking ammunition A and an attacking ammunition B is a prescribed value when the ammunition A which is shot toward a target position a reaches the target position a. The ammunition B is shot toward a target position b after the time interval T from the time that the ammunition A is shot. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for processing a shooting game in which an own aircraft and enemy aircraft are displayed on a screen, and the aircraft is operated to fight an enemy aircraft that fires an attack bullet that moves at a constant speed v. The present invention relates to the program and the recording medium.

In the shooting game, as a method of adjusting the difficulty level of the game, there is a method of adjusting the number of attack bullets present in the game screen. In other words, if you want to increase the difficulty level of the game, increase the number of attack bullets that the enemy planes fire, and if you want to reduce the difficulty level of the game, reduce the number of attack bullets that the enemy planes fire. There was a way.
Further, as shown in Patent Document 1, there is a method of adjusting the difficulty level of the game by changing the speed of the attack bullets according to the number of attack bullets in the screen and the distance between the attack bullets and the own machine.
Japanese Patent No. 3496149

However, just adjusting the number of attack bullets present in the game screen is incomplete for adjusting the difficulty of the game. For example, even if the number of attack bullets fired by enemy aircraft is increased, the difficulty of the game may not increase. Attack bullets that can cause damage to your aircraft are limited to those that are near your aircraft. Attack bullets fired by enemy aircraft with an attack target position that is far from your location are This is because there is no effect in terms of attack.
Also, in order to increase the difficulty of the game, even if the number of attack bullets fired by enemy aircraft is simply increased, it is difficult for the player's eyes to read the intelligent intention of the attack, and the attack bullets are simply scattered. There was a problem that it was easy to be reflected in a boring attack.
Furthermore, although the adjustment method of the difficulty level of the game shown in Patent Document 1 takes into account the distance between the enemy's attack bullets and the player's own aircraft, it can actually be a threat to the player's surroundings. There is a problem that does not consider the relationship between multiple attack bullets.

  According to the present invention, in a shooting game processing method of fighting an enemy aircraft that displays an own aircraft and an enemy aircraft on a screen, operates the aircraft, and fires an attack bullet that moves at a constant speed v, The movement direction of the enemy aircraft, the speed of the enemy aircraft, and the attack bullet firing interval time T are used as action parameters, and the action parameter determination means is the time when the attack bullet A fired toward the target position a arrives at the target position a. Among the above three action parameters, the distance between the attack bullet A and the attack bullet B fired after the attack bullet firing interval time T from the firing of the attack bullet A toward the target position b becomes a constant value. The value of the remaining one behavior parameter of the enemy aircraft that acts according to two predetermined behavior parameters is determined.

By the above method, it is possible to keep the interval between attack bullets around the own aircraft that can actually be a threat to the own aircraft at a constant value.
In addition, it is possible to minimize the number of attack bullets that are not effective in the attack on the own aircraft, and it is possible to realize a shooting game with more game characteristics than ever.

[Theoretical background]
<Explanation of shooting game>
FIG. 5 illustrates a shooting game that is a target of processing of the present invention. On the screen, the own machine 1 and the attack bullet 3 of the own machine 1, and the enemy machine 2 and the attack bullet 4 of the enemy machine 2 are displayed. There may be a plurality of attack bullets 3, enemy aircraft 2, and attack bullets 4. The own aircraft 1, enemy aircraft 2, attack bullet 3, and attack bullet 4 are assumed to be located on a two-dimensional plane composed of the X axis and the Y axis.
The user operates the own aircraft 1 to fight the enemy aircraft 2. The user can move his / her own device for the action unit time T ′ at one type of operation at W types of movement speeds (direction and speed). W types of movement speeds (Vsx (w), Vsy (w)) that the own device 1 can take are determined in advance, and each movement speed (Vsx (w), Vsy (w)) has a movement speed number. It is assumed that w (w = 1,..., W) is attached. Hereinafter, the action of selecting the moving speed number w is referred to as action (w). In addition, the user can perform an operation of firing an attack bullet 3 for attacking the enemy aircraft 2 at the same time as movement at W speeds.

The enemy aircraft 2 can move in the moving direction (cos θ, sin θ) and the speed V. Further, the enemy aircraft 2 can fire the attack bullet 4 toward a certain attack target position at every attack bullet firing interval time T. Assume that the attack bullet 4 fired by the enemy aircraft 2 moves at a speed v toward the attack target position.
When the own aircraft 1 collides with the enemy aircraft 2 and the attack bullet 4 fired by the enemy aircraft 2, the own aircraft 1 is destroyed and the game is over there. On the contrary, when the attack bullet 3 of the own aircraft 1 collides with the enemy aircraft 2, the enemy aircraft 2 is destroyed. When all the enemy aircrafts 2 are destroyed by the attack bullet 3 of the own device 1, the user wins the game.

In the following, it is assumed that the position of the own aircraft is (Xs, Ys) and the position of the enemy aircraft is (Xe, Ye).
In such a shooting game, the magnitude of the threat that the enemy aircraft's attack bullets actually give to the aircraft itself is directly influenced by the interval between the attack bullets around the location of the aircraft. In other words, when the interval between attack bullets around the position of the own aircraft is short, the threat that the enemy aircraft's attack bullets actually gives to the own aircraft increases. This is because if the interval is short, it is difficult for the aircraft to avoid attack bullets. On the other hand, when the interval between attack bullets around the position of the own aircraft is long, the threat that the enemy aircraft's attack bullets actually gives to the own aircraft becomes small. This is because when the interval is long, it is easy for the aircraft to avoid the attack bullets.

In the present invention, the interval between attack bullets existing around the position of the own aircraft, the attack bullet A that was initially fired at the time when the first fire bullet A fired reached the attack target position a, It is defined as the distance s from the attack bullet B fired after the attack bullet firing interval time T from the launch of the attack bullet A.
For example, as shown in FIG. 6, the time when the enemy aircraft fired the attack bullet A is t = 0, the time when the enemy aircraft fires the attack bullet B is t = T, and the attack target position of the attack bullet A is Is a, the attack target position of the attack bullet B is b, and the attack target position a and the attack target position b are both the current position of the aircraft at time t = 0, the attack bullet A and the attack at t = T. The distance s of bullet B is
s = rb-((ra / v) -T) v
s = rb−ra + vT (1)
It can be expressed as Here, ra is the distance between the enemy aircraft and the own aircraft at time t = 0, rb is the distance between the enemy aircraft and the own aircraft at time t = T, and v is the speed of the attack bullet A and attack bullet B. In this case, T is an attack bullet firing interval time.

  In general, an enemy bullet that has been fired by an enemy aircraft that moves away from an attack target position at a certain attack bullet emission interval time T and an enemy aircraft that has moved closer to the attack target position have a constant attack bullet emission interval time T. The distance between the attack bullets when the attack bullets reach the vicinity of the target position of the attack bullet differs greatly from the attack bullets fired every time. That is, the distance between attack bullets fired by enemy aircraft that move away from the attack target position at a certain attack bullet firing interval time T is equal to the distance between enemy bullets that move closer to the attack target position. It becomes longer than the distance between the attacking bullets fired at every firing interval time T.

  Therefore, in one embodiment of the present invention, for example, the distance s that can be expressed as described above is set to a predetermined value sc. Specifically, when the movement direction (cos θ, sin θ) of the enemy aircraft and the attack bullet firing interval time T are determined, the distance s is set to a predetermined value sc based on these values. Determine the speed V of the enemy aircraft. Further, when the enemy aircraft speed V and the attack bullet firing interval time T have been determined, the enemy aircraft movement direction (based on these values so that the distance s becomes the predetermined value sc ( cos θ, sin θ) are determined. Further, when the speed V and the moving direction (cos θ, sin θ) of the enemy aircraft are determined, the attack bullet firing interval time is set so that the distance s becomes a predetermined value sc based on these values. T is determined.

  That is, in the present invention, when the speed V of the enemy aircraft, the movement direction (cos θ, sin θ) of the enemy aircraft, and the attack bullet firing interval time T are called the action parameters of the enemy aircraft, the enemy aircraft The remaining one behavior parameter is determined so that the distance s when acting in accordance with two predetermined behavior parameters becomes a predetermined value sc.

であるため、上記式（１）は、

と表現することができる。
敵機の移動方向（ｃｏｓθ，ｓｉｎθ）と攻撃弾発射間隔時間Ｔが決まっており、これらの値を基にして、上記距離ｓが所定の値ｓｃになるように、敵機の速さＶを決定する場合を例に挙げて、上記式（２）で求められるｓを一定の値ｓｃにする敵機の速さＶを求める方法を以下に説明する。 As the predetermined value sc, for example, sc = 0. Further, when the diameter of a circle inscribed in the shape of the own machine is 30 dots, sc = 30 to 60 can be set.
Note that rb and ra are

Therefore, the above formula (1) is

It can be expressed as
The movement direction (cos θ, sin θ) of the enemy aircraft and the attack bullet firing interval time T are determined. Based on these values, the speed V of the enemy aircraft is set so that the distance s becomes a predetermined value sc. Taking a case of determination as an example, a method for obtaining the speed V of the enemy aircraft that sets s obtained by the above equation (2) to a constant value sc will be described below.

  For example, when a possible value for the speed of the enemy aircraft is in the range of 0 to V0, a large number of sample values Vi (i = 1 to I) that are gradually changed from 0 to V0 are prepared. These sample values Vi are substituted into the right side of the above equation (2). Of the distances si obtained for each sample Vi obtained as a result of substitution, Vi giving the value closest to sc is adopted as the solution. The advantage of this method is that, depending on the positional relationship between the enemy aircraft and the own aircraft, the target attack interval sc may not be realized. Even in such a case, the closest value of s can be realized. There is in point that can.

Alternatively, an approximate solution of the above equation (2) may be obtained by the so-called Newton method (see, for example, Hiroshi Yabe and Naoichi Yamaki, “Nonlinear Programming Applied Mathematics Library”, Asakura Shoten). Since Newton's method is a well-known technique, description thereof is omitted.
Further, the above equation (2) is analytically solved for the velocity V of the enemy aircraft, and the analytically solved equation includes the movement direction (cos θ, sin θ) of the enemy aircraft, the attack bullet firing interval time T, and a constant value. The speed V of the enemy aircraft may be obtained by substituting sc.

The speed V of the enemy aircraft and the time interval T of attacking bullets are determined. Based on these values, the movement direction (cos θ, sin θ) of the enemy aircraft is set so that the distance s becomes a predetermined value sc. When determined, the speed V and the moving direction (cos θ, sin θ) of the enemy aircraft are determined, and based on these values, the attack bullet firing interval is set so that the distance s becomes a predetermined value sc. The method described above can also be used when determining the time T.
Hereinafter, Examples 1 to 4 for carrying out the present invention will be described.

<Device configuration>
With reference to FIG. 1, a shooting game processing apparatus 1001 for carrying out the shooting game processing method according to the first embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a functional configuration example of the shooting game processing apparatus 1001.
Shooting game processing device 1001 includes, for example, behavior parameter determination unit 10, position acquisition unit 91, attack bullet distance setting unit 92, attack bullet firing interval time setting unit 93, enemy aircraft movement direction determination unit 95, enemy aircraft speed determination unit. 96.

The behavior parameter determination unit 10 includes, for example, an attack bullet distance calculation unit 11, a sample value storage unit 12, a storage unit 13, and a determination unit 14.
The attack bullet distance calculation unit 11 includes, for example, a distance calculation unit 110, an addition unit 111, a multiplication unit 112, and a subtraction unit 113.
The determination unit 14 includes, for example, a storage unit 140, a subtraction unit 141, a square unit 142, and a minimum value selection unit 143.

<How to find the speed of enemy aircraft>
The enemy aircraft movement direction determination unit 95 determines the movement direction (cos θ, sin θ) of the enemy aircraft in advance and stores it in the storage unit 13. In the present invention, for example, the speed of the enemy aircraft is determined based on a predetermined enemy aircraft movement direction (cos θ, sin θ). Therefore, how to determine the enemy aircraft movement direction (cos θ, sin θ) is as follows. It doesn't matter.
The attack bullet firing interval time setting unit 93 sets the attack bullet firing interval time T in advance and stores it in the storage unit 13. For example, the attack bullet firing interval time T can be set to 0.6 seconds to 2 seconds. The attack bullet firing interval time T can be arbitrarily set according to the length required by the user.

The attack bullet distance setting unit 92 predetermines a fixed value sc of the attack bullet distance that the user wants and stores it in the storage unit 13. For example, it can be set as sc = 0. Further, the game player may be able to set sc to an arbitrary value by an input such as a lever operation.
The position acquisition unit 91 acquires the position (Xs, Ys) of the own aircraft and the position (Xe, Ye) of the enemy aircraft at the current time (t = 0), and stores them in the storage unit 13.
In addition, it is assumed that the sample value storage unit 12 stores sample values V1,..., Vi,. Sample values V1,..., Vi,..., VI are candidate values of enemy aircraft speed.

をそれぞれ計算する。また、攻撃弾距離計算部１１の乗算部１１２は、記憶部１３から読み出したｖ，Ｔを用いてｖＴを計算する。攻撃弾距離計算部１１の加算部１１１は、距離計算部１１０が求めたｒｂに、乗算部１１２が求めたｖｔを加算する。攻撃弾距離計算部１１の減算部１１３は、加算部１１１が計算した加算結果から、距離計算部１１０が求めたｒａを減算して、距離ｓｉを求める。このようにして、各サンプル値Ｖｉ毎に求まった距離ｓｉは、決定部１４の記憶部１４０に格納される。 The attack bullet distance calculation unit 11 calculates the distance si based on the above equation (2) for each sample value Vi of the speed of the enemy aircraft read from the sample value storage unit 12. Specifically, the distance calculation unit 110 of the attack bullet distance calculation unit 11 reads the sample value Vi of the speed of the enemy aircraft read from the sample value storage unit 12 and Xe, Ye, cos θ, sin θ read from the storage unit 13. , V, T

Respectively. Further, the multiplication unit 112 of the attack bullet distance calculation unit 11 calculates vT using v and T read from the storage unit 13. The addition unit 111 of the attack bullet distance calculation unit 11 adds vt obtained by the multiplication unit 112 to rb obtained by the distance calculation unit 110. The subtraction unit 113 of the attack bullet distance calculation unit 11 subtracts ra obtained by the distance calculation unit 110 from the addition result calculated by the addition unit 111 to obtain the distance si. In this manner, the distance si obtained for each sample value Vi is stored in the storage unit 140 of the determination unit 14.

The subtracting unit 141 of the determining unit 14 subtracts sc from the distance si and outputs the calculation result to the square unit 142 of the determining unit 14. The square unit 142 calculates the square of si-sc and stores the calculation result (si-sc) ² in the storage unit 140. The minimum value selection unit 143 of the determination unit 14 determines the minimum value from (si-sc) ² read from the storage unit 140, and outputs Vi giving the minimum value as the speed V of the enemy aircraft. .
Vi giving the minimum value gives a distance si closest to the distance sc in a predetermined moving direction θ of the enemy aircraft and a predetermined attack bullet firing interval time T.
In this way, the shooting game processing apparatus 1001 determines the speed V of the enemy aircraft.

<How to determine the direction of enemy aircraft movement>
It is assumed that the enemy aircraft speed V, not the enemy aircraft movement direction (cos θ, sin θ), is predetermined by the enemy aircraft speed determination unit 96 and stored in the storage unit 13.
Further, it is assumed that the sample value storage unit 12 stores sample values θ1,..., Θj,..., ΘJ of angles representing the moving directions (cos θ, sin θ) of enemy aircraft. Sample values θ1,..., Θj,..., ΘJ are angle candidate values representing the moving directions (cos θ, sin θ) of the enemy aircraft.

Further, the attack bullet firing interval time T, the constant value sc of the attack bullet distance, the position of the own aircraft (Xs, Ys), the position of the enemy aircraft in the same manner as described in the method for obtaining the speed of the enemy aircraft Assume that (Xe, Ye) is stored in the storage unit 13.
The attack bullet distance calculation unit 11 calculates the distance sj based on the above equation (2) for each sample value θj of the angle in the moving direction of the enemy aircraft read from the sample value storage unit 12. The calculation process of the attack bullet distance calculation unit 11 is the same as the calculation process for obtaining the distance si from the sample value Vi of the enemy aircraft speed described above. The sj obtained for each sample value θj is stored in the storage unit 140 of the determination unit 14.
The determination unit 14 obtains θj that gives a value closest to sc among sj obtained for each sample value θj by the same method as described in the method for obtaining the speed of the enemy aircraft.

<How to determine the time interval T for launching attack bullets>
The movement direction (cos θ, sin θ) of the enemy aircraft predetermined by the enemy aircraft movement direction determination unit 95 and the speed V of the enemy aircraft predetermined by the enemy aircraft speed determination unit 96 are stored in the storage unit 13. It shall be.
It is assumed that the storage unit 13 does not store the attack bullet firing interval time T.
Further, it is assumed that the sample value storage unit 12 stores sample values T1,..., Tk,. Sample values T1,..., Tk,..., TK are candidate values for the attack bullet firing interval time T.

Further, the attack bullet firing interval time T, the constant value sc of the attack bullet distance, the position of the own aircraft (Xs, Ys), the position of the enemy aircraft in the same manner as described in the method for obtaining the speed of the enemy aircraft Assume that (Xe, Ye) is stored in the storage unit 13.
The attack bullet distance calculation unit 11 is a method similar to the method described in the method of obtaining the speed of the enemy aircraft, and each sample value T1,..., Tk, of the attack bullet firing interval time T read from the sample value storage unit 12 is obtained. ..., the distance sk is calculated for each TK based on the above equation (2). The calculated sk is stored in the storage unit 140 of the determination unit 14.

The deciding unit 14 obtains Tk that gives a value closest to sc among sks obtained for each sample value Tk by the same method as described in the method for obtaining the speed of the enemy aircraft.
In this manner, the action parameter determination unit 10 performs the attack bullet in a state where any two of the enemy aircraft speed V, the enemy aircraft movement direction (cos θ, sin θ), and the attack bullet firing interval time T are determined. The value of the remaining one parameter is determined so that the distance s becomes a constant value sc.

と簡潔に表現することができる。 The shooting game processing apparatus 1002 described in the second embodiment is different from the shooting game processing apparatus 1001 described in the first embodiment in that it includes an attack bullet distance calculation unit 21 instead of the attack bullet distance calculation unit 11.
The attack bullet distance calculation unit 21 includes, for example, an angle calculation unit 210, a second coordinate conversion unit 211, a first coordinate conversion unit 212, and an interval calculation unit 213.
In the second embodiment, as shown by a dotted line in FIG. 6, the position (Xs, Ys) of the own aircraft at t = 0 is set as the origin, and the position (Xs, Ys) of the own aircraft and the enemy aircraft at t = 0. The coordinates are taken so that the straight line connecting the positions (Xe, Ye) becomes the Y axis. Then, since Xs, Ys, and Xe become 0, the above equation (2) becomes

And can be expressed concisely.

であり、Ｙｅ’は、

である。ここで、θａは、

と計算することができる。 In the above equation (4), cos′θ and sin′θ are the difference between the angle of the original coordinate system and the new coordinate system as θa.

Ye ′ is

It is. Where θa is

And can be calculated.

  The attack bullet distance calculation unit 21 shown in FIG. 2 calculates the distance s for each sample value based on the above equations (4) to (7) instead of the attack bullet distance calculation unit 11. For example, when the speed V of the enemy aircraft is determined so that the distance s becomes a constant value sc when the moving direction (cos θ, sin θ) of the enemy aircraft and the attack bullet firing interval time T are preset. From the position (Xs, Ys) of the own aircraft read from the storage unit 13 and the position (Xe, Ye) of the enemy aircraft, the angle calculation unit 210 of the attack bullet distance calculation unit 21 is based on the above equation (7). θa is calculated. Further, the first coordinate conversion unit 212 calculates Ye ′ from the position (Xs, Ys) of the own aircraft read from the storage unit 13 and the position (Xe, Ye) of the enemy aircraft based on the above formula (6). To do. Further, the second coordinate conversion unit 211 calculates the movement direction (cos′θ, sin′θ) of the enemy aircraft after the coordinate conversion based on θa calculated by the angle calculation unit 210 and the above equation (5). . The distance calculation unit 213 performs the coordinate transformation of the enemy aircraft movement direction (cos′θ, sin′θ), Ye ′, Vi read from the sample value storage unit 12, and T read from the storage unit 13. From v, the distance si is obtained based on the above equation (4). In this way, si obtained for each sample Vi is stored in the storage unit 140 of the determination unit 14.

のように解析的に解くことができる。 Since other processes are the same as those of the shooting game processing apparatus 1001 of the first embodiment, description thereof is omitted.
In addition, the above formula (4) is, for example, for the speed V of the enemy aircraft,

It can be solved analytically as follows.

For this reason, the behavior parameter determination unit 20 shown in FIG. 2 obtains Ye ′ obtained by the first coordinate conversion unit 212, cos′θ, sin′θ obtained by the second coordinate conversion unit 211, and the storage unit 13. Using the read v, T, and sc, the speed V of the enemy aircraft may be obtained based on the above equation (7 ′).
When the speed V of the enemy aircraft and the attack bullet firing interval time T are set in advance, the movement direction (cos θ, sin θ) of the enemy aircraft is determined so that the distance s becomes a constant value sc. When the speed V of the enemy aircraft and the moving direction (cos θ, sin θ) of the enemy aircraft are set in advance, the attack bullet firing interval time T is determined so that the distance s becomes a constant value sc. Sometimes, the distance s is obtained in the same manner as described above.

The shooting game processing apparatus 1003 described in the third embodiment has been described in the first embodiment in that it includes the attack bullet distance calculation unit 31 instead of the attack bullet distance calculation unit 11 and the own apparatus moving speed acquisition unit 97. Different from the shooting game processing apparatus 1001.
The attack bullet distance calculation unit 31 includes, for example, a distance calculation unit 310, a position calculation unit 311, and an interval calculation unit 312.
In the first embodiment and the second embodiment, both the attack target position a and the attack target position b are the positions of the aircraft at t = 0. However, even if the attack target position a and the attack target position b are different, the action parameter of the enemy aircraft can be set so that the distance s becomes a constant value sc.

と表現することができる。また、時刻ｔ＝０における敵機と自機の位置の距離ｒａは、

である。 For example, the attack bullet target position a is set to the position of the own aircraft at t = 0, and the attack target position b is maintained at the speed (Vsx, Ysy) of the own aircraft at the current time t = 0 for the attack bullet firing interval time T. Then, it is assumed that the position of the own device at time t = T when it is assumed. At this time, the position of the own aircraft at t = T is (Xs + VsxT, Ys + VsyT), and the position of the enemy aircraft at t = T is (Xe + VTcosθ, Ye + VTsinθ), so the distance between the own aircraft and the enemy aircraft at time t = T rb is

It can be expressed as Also, the distance ra between the enemy aircraft and its own aircraft at time t = 0 is

It is.

である。上記式（９）で示されたＸｂとＹｂを用いると、距離ｓは、

と表現することができる。 At this time, the position (Xb, Yb) of the attack bullet B when the attack bullet A fired at time t = 0 arrives at its own position (Xs, Ys) at time t = 0.

It is. Using Xb and Yb shown in the above equation (9), the distance s is

It can be expressed as

The attack bullet distance calculation unit 31 shown in FIG. 3 calculates the distance s for each sample using the above equations (8) to (10). For example, the speed V of the enemy aircraft is determined so that the distance s between the attack bullets is a constant value sc, given the movement direction (cos θ, sin θ) of the enemy aircraft and the interval time T of the bullet shot. The Xs, Ys, Xe, Ye, θ, T, Vsx, and Vsy read from the storage unit 13 by the distance calculation unit 310 of the attack bullet distance calculation unit 31 and Vi read from the sample value storage unit 12 are included. Using the above equation (8) and equation (8 ′), ra and rb are calculated. Vsx and Vsy are obtained by acquiring the current speed of the own machine at time t = 0 in advance by the own machine moving speed obtaining unit 97 and storing it in the storage unit 13. The position calculation unit 311 uses the ra and rb calculated as described above, and the attack bullet A fired at time t = 0 arrives at the attack target position a based on the above equation (9). The position (Xb, Yb) of the attack bullet B is calculated. The interval calculation unit 312 calculates the distance s from the above equation (10) using Xb and Yb calculated as described above. The distance s obtained for each sample value Vi is stored in the storage unit 140 of the determination unit 14.
Since other processes are the same as those of the shooting game processing apparatus 1001 described in the first embodiment, the description thereof is omitted.

The shooting game processing apparatus 1004 described in the fourth embodiment is described in the first embodiment in that it includes an attack bullet distance calculation unit 41 instead of the attack bullet distance calculation unit 11 and an own-machine moving speed acquisition unit 97. Different from the shooting game processing apparatus 1001 that has been made.
The attack bullet distance calculation unit 41 includes, for example, a distance calculation unit 410, a position calculation unit 411, an interval calculation unit 412, and a random number generation unit 413.
The attack target position “a” of the attack bullet A and the attack target position “b” of the attack bullet B can be set to positions where a certain random displacement is given to the current position (Xs, Ys) of the own aircraft.

  The random number generation unit 413 of the attack bullet distance calculation unit 41 performs random values (rndax, rnday), (rndbx,) of the displacement amount in the X-axis direction and the displacement amount in the Y-axis direction for the attack target position a and the attack target position b. rndby). At this time, the attack target position a is (Xs + rndax, Ys + rnday). Further, assuming that the aircraft maintains the velocity (Vsx, Ysy) of the aircraft at the current time t = 0 for only the attack bullet firing interval time T, the attack target position b is (Xs + VsxT + rndbx, Ys + VsyT + rndby).

  Specifically, if the diameter of a circle inscribed in the shape of the machine is M, the width of the displacement amount in the X-axis direction and the displacement amount in the Y-axis direction is preferably about −3M to 3M. For example, when the size of the shape of its own device is 30 dots, the displacement amount in the X-axis direction and the displacement amount in the Y-axis direction can each take a value of −50 to 50 dots at random. It is good to make it.

と表現することができる。このとき、時刻ｔ＝０で発射された攻撃弾Ａが時刻ｔ＝０における自機の位置（Ｘｓ，Ｙｓ）に到着したときの攻撃弾Ｂの位置（Ｘｂ，Ｙｂ）は、

である。上記式（１２）で示されたＸｂとＹｂを用いると、距離ｓは、

と表現することができる。 As described above, when a random displacement position at the position of the own aircraft is set as the attack target position, the distance ra between the position of the enemy aircraft and the attack target position a at time t = 0 is set, and time t = T If the distance between the enemy aircraft's position and the attack target position b is rb,

It can be expressed as At this time, the position (Xb, Yb) of the attack bullet B when the attack bullet A fired at time t = 0 arrives at its own position (Xs, Ys) at time t = 0.

It is. Using Xb and Yb shown in the above equation (12), the distance s is

It can be expressed as

  The attack bullet distance calculation unit 41 shown in FIG. 4 calculates the distance s for each sample using the above equations (11) to (13). For example, the speed V of the enemy aircraft is determined so that the distance s between the attack bullets is a constant value sc, given the movement direction (cos θ, sin θ) of the enemy aircraft and the interval time T of the bullet shot. Includes the Xs, Ys, Xe, Ye, θ, T, Vsx, and Vsy read from the storage unit 13 by the distance calculation unit 410 of the attack bullet distance calculation unit 41, Vi read from the sample value storage unit 12, and Based on the above equation (11), ra and rb are calculated using rndax, rnday, rndbx, and rndby generated by the random number generator 413. Vsx and Vsy are obtained by acquiring the current speed of the own machine at time t = 0 in advance by the own machine moving speed obtaining unit 97 and storing it in the storage unit 13. The position calculation unit 411 uses the ra and rb calculated as described above, and the attack bullet A fired at time t = 0 arrives at the attack target position a based on the above equation (12). The position (Xb, Yb) of the attack bullet B is calculated. The interval calculation unit calculates the distance s from the above equation (13) using Xb and Yb calculated as described above. The distance s obtained for each sample value Vi is stored in the storage unit 140 of the determination unit 14.

Since other processes are the same as those of the shooting game processing apparatus 1001 described in the first embodiment, the description thereof is omitted.
In the above description, random values (rndax, rnday) and (rndbx, rndby) are generated for the attack target position a and the attack target position b, respectively, but either one of the attack target position a and the attack target position b is generated. For the other attack target position, the current position of the own aircraft may be set as the attack target position. Further, only one set (rnndx, rndy) of the displacement amount in the X-axis direction and the displacement amount in the Y-axis direction is generated, and this (rnndx, rndy) is generated as a random value (rndax, rnday) for the attack target position a. ) And random values (rndbx, rndby) for the attack target position b.

  It should be noted that with the attack target position b as the origin, the coordinates are read again so that the straight line connecting the attack target position b and the position of the enemy aircraft at time t = T (Xe + VTcos θ, Ye + VT sin θ) becomes the Y axis, and the above formulas (11) to (11) 13) may be simplified, and the distance s may be calculated using these simplified expressions.

Regarding other embodiments and modifications , the processing function of the shooting game processing apparatus can be realized by a computer. In this case, the content of the processing function of the shooting game processing device is described by a program. Then, by executing this program on a computer as shown in FIG. 16, the processing functions of the shooting game processing device are realized on the computer.

  The program describing the processing contents can be recorded on a computer-readable recording medium. As the computer-readable recording medium, for example, any recording medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory may be used. Specifically, for example, as a magnetic recording device, a hard disk device, a flexible disk, a magnetic tape or the like, and as an optical disk, a DVD (Digital Versatile Disc), a DVD-RAM (Random Access Memory), a CD-ROM (Compact Disc Read Only). Memory), CD-R (Recordable) / RW (ReWritable), etc., magneto-optical recording medium, MO (Magneto-Optical disc), etc., semiconductor memory, EEP-ROM (Electronically Erasable and Programmable-Read Only Memory), etc. Can be used.

  The program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Furthermore, the program may be distributed by storing the program in a storage device of the server computer and transferring the program from the server computer to another computer via a network.

  A computer that executes such a program first stores, for example, a program recorded on a portable recording medium or a program transferred from a server computer in its own storage device. When executing the process, the computer reads a program stored in its own recording medium and executes a process according to the read program. As another execution form of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to the computer. Each time, the processing according to the received program may be executed sequentially. Also, the program is not transferred from the server computer to the computer, and the above-described processing is executed by a so-called ASP (Application Service Provider) type service that realizes the processing function only by the execution instruction and result acquisition. It is good. Note that the program in this embodiment includes information that is provided for processing by an electronic computer and that conforms to the program (data that is not a direct command to the computer but has a property that defines the processing of the computer).

In this embodiment, the shooting game processing apparatus is configured by executing a predetermined program on a computer. However, at least a part of these processing contents may be realized by hardware.
In addition to the above embodiments, the shooting game processing method, the apparatus thereof, and the like according to the present invention are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

The figure which illustrated the function structure of the shooting game processing apparatus 1001. The figure which illustrated the functional structure of the shooting game processing apparatus 1002. The figure which illustrated the functional structure of the shooting game processing apparatus 1003. The figure which illustrated the functional structure of the shooting game processing apparatus 1004. A schematic diagram of a shooting game. The figure which shows the positional relationship of an enemy aircraft and an own machine in case the attack target position a and the attack target position b are the positions of the own machine in t = 0. The figure which illustrated the functional composition when performing a shooting game processing device with a computer.

Explanation of symbols

1: Own aircraft, 2: Enemy aircraft, 3: Attack bullet, 4: Attack bullet, 4A: Attack bullet A, 4B: Attack bullet B, 5: CPU, 6: RAM, 7: Output unit, 8: Auxiliary storage unit , 9: input unit, 9 ′: bus, 10: behavior parameter determination unit, 11: attack bullet distance calculation unit, 12: sample value storage unit, 13: storage unit, 14: determination unit, 20: behavior parameter determination unit, 21: Attack bullet distance calculation section, 31: Attack bullet distance calculation section, 41: Attack bullet distance calculation section, 91: Position acquisition section, 92: Attack bullet distance setting section, 93: Attack bullet firing interval time setting section, 95: Enemy aircraft movement direction determination unit, 96: determination unit, 97: own vehicle movement speed acquisition unit, 110: distance calculation unit, 111: addition unit, 112: multiplication unit, 113: subtraction unit, 140: storage unit, 141: subtraction Part, 142: square part, 143: minimum value selection part, 10: angle calculation part, 211: second seat Conversion unit, 212: first coordinate conversion unit, 213: interval calculation unit, 310: distance calculation unit, 311: position calculation unit, 312: interval calculation unit, 410: distance calculation unit, 411: position calculation unit, 412: interval Calculation unit, 413: random number generation unit, 1001: shooting game processing device, 1002: shooting game processing device, 1003: shooting game processing device, 1004: shooting game processing device

Claims (10)

In the shooting game processing method of fighting an enemy aircraft that fires attack bullets that move at a constant speed v by displaying the aircraft and enemy aircraft on the screen, operating the aircraft,
Using the movement direction of the enemy aircraft, the speed of the enemy aircraft, and the attack bullet launch time T as action parameters,
When the action parameter determining means reaches the target position “a” when the attack bullet A fired toward the target position “a” arrives at the target position “a”, and the attack bullet launch interval from the launch of the attack bullet A toward the target position “b”. The remaining one behavior parameter of the enemy aircraft that acts according to two predetermined behavior parameters among the three behavior parameters so that the distance from the attack bullet B fired after time T becomes a constant value. Action parameter decision process to determine the value,
A shooting game processing method characterized by comprising: The shooting game processing method according to claim 1,
The target position a and the target position b are the positions of the own aircraft when the enemy aircraft launches the attack bullet A,
A method for processing a shooting game. The shooting game processing method according to claim 2,
The action parameter determination process adds the distance between the enemy aircraft and the enemy aircraft at the time when the attack bullet B is fired, and the value obtained by multiplying the attack bullet speed v by the attack bullet firing interval time T, This is a process of determining the remaining one action parameter so that the distance obtained by subtracting the distance between the own aircraft and the enemy aircraft at the time when the attack bullet A is fired from the addition result becomes a constant value. ,
A method for processing a shooting game. The shooting game processing method according to claim 1,
The behavior parameter determination process is as follows:
The attack bullet distance A fired toward the target position a arrives at the target position a based on each sample value of the one remaining behavior parameter read from the sample value storage means by the attack bullet distance calculation means. An attack bullet distance calculation process for obtaining a distance between the attack bullet A and the attack bullet B fired after the attack bullet firing interval time T from the launch of the attack bullet A toward the target position b,
A determination process in which the determination means determines the remaining one behavior parameter that gives a value closest to the constant value among the distances obtained for each sample;
Consisting of,
A method for processing a shooting game. The shooting game processing method according to claim 4,
The target position a and the target position b are the positions of the own aircraft when the enemy aircraft fires the attack bullet A,
The attack bullet distance calculation process adds the distance between the enemy aircraft and the enemy aircraft at the time when the attack bullet B was fired, and the value obtained by multiplying the attack bullet speed v by the attack bullet firing interval time T, This is the process of subtracting the distance between the enemy aircraft and the enemy aircraft when the attack bullet A was fired from the addition result, and calculating the attack bullet distance.
A method for processing a shooting game. In the shooting game processing method according to claim 1 or 4,
The target position a is the position of the own aircraft at the time when the enemy aircraft fires the attack bullet A,
The target position b is a position where the own aircraft has moved by the attack bullet firing interval time T at the speed of the own aircraft at the time when the enemy aircraft fires the attack bullet A.
A method for processing a shooting game. In the shooting game processing method according to claim 1 or 4,
At least one of the target position a and the target position b is a position where a certain random displacement is given to the position of the own aircraft at the time when the enemy aircraft fires an attack bullet,
A method for processing a shooting game. In a shooting game processing device that displays its own aircraft and enemy aircraft on the screen, operates the aircraft, and fights enemy aircraft that launch attack bullets that move at a constant speed v.
Using the movement direction of the enemy aircraft, the speed of the enemy aircraft, and the attack bullet launch time T as action parameters,
At the time when the attack bullet A fired toward the target position a arrived at the target position a, it was fired after the attack bullet firing interval time T from the attack bullet A toward the target position b. An action parameter that determines the value of the remaining one action parameter of an enemy aircraft that acts according to two predetermined action parameters among the above three action parameters so that the distance from the attack bullet B becomes a constant value. Decision means,
A shooting game processing apparatus comprising:   A shooting game processing program for causing a computer to execute each step of the shooting game processing method according to claim 1. A computer-readable recording medium on which the shooting game processing program according to claim 9 is recorded.

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