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package gjt.animation;
import java.awt.*;
import java.util.Enumeration;
import java.util.Vector;
import gjt.Orientation;
/**
* A CollisionDetector that detects collisions between Sprites
* and the edges of the CollisionArena in which they reside.<p>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see CollisionDetector
* @see Sprite
* @see gjt.test.SimpleAnimationTest
* @see gjt.test.BumpAnimationTest
* @see gjt.test.TwoDrinkersAnimationTest
*/
public class EdgeCollisionDetector extends CollisionDetector {
public EdgeCollisionDetector(CollisionArena arena) {
super(arena);
}
public void detectCollisions() {
Enumeration sprites = arena.getSprites().elements();
Dimension arenaSize = arena.getSize();
Insets arenaInsets = arena.getInsets();
Sprite sprite;
while(sprites.hasMoreElements()) {
sprite = (Sprite)sprites.nextElement();
Point nl = sprite.nextLocation ();
Point mv = sprite.getMoveVector();
int nextRightEdge = nl.x + sprite.width();
int nextBottomEdge = nl.y + sprite.height();
int arenaBottomEdge = arenaSize.height -
arenaInsets.bottom;
int arenaRightEdge = arenaSize.width -
arenaInsets.right;
if(nextRightEdge > arenaRightEdge)
arena.edgeCollision(sprite, Orientation.LEFT);
else if(nl.x < arenaInsets.left)
arena.edgeCollision(sprite, Orientation.RIGHT);
if(nextBottomEdge > arenaBottomEdge)
arena.edgeCollision(sprite, Orientation.BOTTOM);
else if(nl.y < arenaInsets.top)
arena.edgeCollision(sprite, Orientation.TOP);
}
}
}
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