碰撞检测圈 [英] Collision detection for circles

问题描述

我有了两个用户控制的球，一个简单的Java小程序，使用抽 java.awt中。我需要一种方法来检测与它们之间的碰撞。我有一个算法，用于检测与壁碰撞：

I have a simple Java applet that has two user-controlled balls, drawn using java.awt. I need a way to detect a collision with between them. I have an algorithm for detecting collision with the walls:

if (xPosition > (300 - radius)){
   xSpeed = -xSpeed; 
}
else if (xPosition < radius){
   xSpeed = -xSpeed; 
}
else if (yPosition > (300 - radius)) {
   ySpeed = -ySpeed;
}
else if (yPosition < radius){
   ySpeed = -ySpeed;
}
xPosition += xSpeed;
yPosition += ySpeed;

和用于第二球：

if (xPosition2 > (300 - radius)){
   xSpeed2 = -xSpeed2; 
}
else if (xPosition2 < radius){
   xSpeed2 = -xSpeed2; 
}
else if (yPosition2 > (300 - radius)) {
   ySpeed2 = -ySpeed2;
}
else if (yPosition2 < radius){
   ySpeed2 = -ySpeed2;
}
xPosition2 += xSpeed2;
yPosition2 += ySpeed2;

• 小程序为300 x 300像素。


• 半径存储圆的半径。


• xPosition位置和 xPosition2 存储两个球的X坐标。


• yPosition 和 yPosition 存储y坐标两球，


• xSpeed​​ 和 xSpeed​​2 存储的X速度为两球。


• ySpeed​​ 和 ySpeed​​2 存储在y速度为两球。


• The applet is 300 pixels by 300 pixels.
• radius stores the radius of the circles.
• xPosition and xPosition2 store the x coordinates for the two balls.
• yPosition and yPosition store the y coordinates for the two balls,
• xSpeed and xSpeed2 store the x velocities for the two balls.
• ySpeed and ySpeed2 store the y velocities for the two balls.

推荐答案

使用的 http://java.sun.com/j2se/1.5.0/docs/api/java/awt/geom/Point2D.html ，还有一段距离的方法有，如果这是不到他们的碰撞半径。

Use http://java.sun.com/j2se/1.5.0/docs/api/java/awt/geom/Point2D.html, there's a distance method there, if it's less than the radius they're colliding.

编辑：
犯错，小于半径* 2，不好意思

Err, less than the radius * 2 , sorry

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