Android Open Source - X3n0break Util

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License

The source code is released under:
GNU General Public License
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Java Source Code

package org.x3n0m0rph59.breakout;
/*  w ww .  j a  va  2s.  c o m*/
import java.util.Random;

import com.badlogic.gdx.math.Rectangle;


enum Edge {LEFT, TOP_LEFT, TOP, TOP_RIGHT, RIGHT, BOTTOM_RIGHT, BOTTOM, BOTTOM_LEFT, CENTER}

public final class Util {
  public static Edge getCollisionEdge(Rectangle r1, Rectangle r2) {
    if (collisionTest(r1, r2)) {
      
      final Point r1Center     = new Point(r1.x + r1.getWidth() / 2, r1.y + r1.getHeight() / 2);
      final Point r1TopLeft     = new Point(r1.x, r1.y);
      final Point r1BottomRight   = new Point(r1.x + r1.getWidth(), r1.y + r1.getHeight());
      final Point r1BottomCenter   = new Point(r1.x + r1.getWidth() / 2, r1.y + r1.getHeight());
      final Point r1BottomLeft   = new Point(r1.x, r1.y + r1.getHeight());
      final Point r1LeftCenter   = new Point(r1.x, r1.y + r1.getHeight() / 2);
      final Point r1TopCenter   = new Point(r1.x + r1.getWidth() / 2, r1.y);
      final Point r1TopRight     = new Point(r1.x + r1.getWidth(), r1.y);

      final Rectangle left       = new Rectangle(r2.getX() - r1.getWidth(), r2.getY(), r1.getWidth(), r2.getHeight());
      final Rectangle top_left     = new Rectangle(r2.getX() - r1.getWidth(), r2.getY() - r1.getHeight(), r1.getWidth(), r1.getHeight());
      final Rectangle top       = new Rectangle(r2.getX(), r2.getY() - r1.getHeight(), r2.getWidth(), r1.getHeight());
      final Rectangle top_right     = new Rectangle(r2.getX() + r2.getWidth(), r2.getY() - r1.getHeight(), r1.getWidth(), r1.getHeight());
      final Rectangle right       = new Rectangle(r2.getX() + r2.getWidth(), r2.getY(), r1.getWidth(), r2.getHeight());
      final Rectangle bottom_right   = new Rectangle(r2.getX() + r2.getWidth(), r2.getY() + r2.getHeight(), r1.getWidth(), r1.getHeight());
      final Rectangle bottom       = new Rectangle(r2.getX(), r2.getY() + r2.getHeight(), r2.getWidth(), r1.getHeight());
      final Rectangle bottom_left   = new Rectangle(r2.getX() - r1.getWidth(), r2.getY() + r2.getHeight(), r1.getWidth(), r1.getHeight());
      
      if (left.contains(r1Center.getX(), r1Center.getY()) ||
        left.contains(r1TopRight.getX(), r1TopRight.getY()) ||
        left.contains(r1TopLeft.getX(), r1TopLeft.getY()))
        return Edge.LEFT;
      else if (right.contains(r1Center.getX(), r1Center.getY()) ||
           right.contains(r1TopLeft.getX(), r1TopLeft.getY()) ||
           right.contains(r1LeftCenter.getX(), r1LeftCenter.getY()))
        return Edge.RIGHT;
      else if (bottom.contains(r1Center.getX(), r1Center.getY()) || 
           bottom.contains(r1TopCenter.getX(), r1TopCenter.getY()))
        return Edge.BOTTOM;
      else if (top.contains(r1Center.getX(), r1Center.getY()) || 
           top.contains(r1BottomCenter.getX(), r1BottomCenter.getY()))
        return Edge.TOP;      
      else if (top_left.contains(r1Center.getX(), r1Center.getY()) || 
           top_left.contains(r1BottomRight.getX(), r1BottomRight.getY()))
        return Edge.TOP_LEFT;      
      else if (top_right.contains(r1Center.getX(), r1Center.getY()) || 
           top_right.contains(r1BottomLeft.getX(), r1BottomLeft.getY()))
        return Edge.TOP_RIGHT;      
      else if (bottom_right.contains(r1Center.getX(), r1Center.getY()) || 
           bottom_right.contains(r1TopLeft.getX(), r1TopLeft.getY()) )
        return Edge.BOTTOM_RIGHT;      
      else if (bottom_left.contains(r1Center.getX(), r1Center.getY()) || 
           bottom_left.contains(r1TopRight.getX(), r1TopRight.getY()))
        return Edge.BOTTOM_LEFT;
      
      // Collision occurred in the center of the rectangle?
      else if (r2.contains(r1Center.getX(), r1Center.getY())) {        
        if (r1Center.getX() >= r2.getX() + (r2.getWidth() / 2))
          return Edge.RIGHT;
        else if (r1Center.getX() <= r2.getX() + (r2.getWidth() / 2))
          return Edge.LEFT;
        
        else {
          Logger.error("WARNING: Collision detector failed to detect exact collision edge!");
          return Edge.CENTER;
        }
      }
      
      throw new RuntimeException("Bug in collision detector");
    }
    else
      return null;    
  }
  
  public static boolean collisionTest(Rectangle r1, Rectangle r2) {
    return r1.overlaps(r2);
  }

  public static int random(int min, int max) {
    final Random rnd = new Random();
    return rnd.nextInt(Math.abs(max - min) + 1) + min;
  }

  public static int signum(float val) {
    return (int) Math.signum(val);
  }

  public static int max(int p1, int p2) {
    if (p1 > p2)
      return p1;
    else
      return p2;
  }
}
Java Source Code List
