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Author: Ultroman (posted 2012-06-15 16:09:34, viewed 330 times)

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package applet;

import java.awt.Color;
import java.awt.Graphics;

public class Ball {

   double xVel, yVel;
   double xPos, yPos;
   int frameHeight;
   int frameWidth;
   int size;
   Color color;
   
   public Ball(Color color, int frameWidth, int frameHeight, int size, double x, double y, double xVel, double yVel) {
      this.frameWidth = frameWidth;
      this.frameHeight = frameHeight;
      this.xPos = x;
      this.yPos = y;
      this.xVel = xVel;
      this.yVel = yVel;
      this.size = size;
      this.color = color;
   }
   
   public void draw(Graphics g){
      g.setColor(color);
      g.fillOval((int)xPos, (int)yPos, size, size);
   }
   
   public void bounceX() {
      xVel *= -1;
   }
   
   public void bounceY() {
      yVel *= -1;
   }
   
   public void update(int deltaTime) {
      // move the ball
      yPos += deltaTime * yVel;
      xPos += deltaTime * xVel;
      
      // check the boundaries
      if(yPos <= 0) {
         bounceY();
         yPos = 0;
      } else if(yPos >= frameHeight-size) {
         bounceY();
         yPos = frameHeight-size;
      }
      
      if(xPos <= 0) {
         bounceX();
      } else if(xPos >= frameWidth-size) {
         bounceX();
      }
   }
}





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