import java.awt.*;

import com.genuts.gameui.*;

/**
 * Follows a sprite by moving the offset of the playfield.
 */
public class FollowWrapper extends SpriteWrapper {

  public FollowWrapper(Sprite sprite) {
    super(sprite);
  }

  public boolean setPosition(int x, int y) {
    if (super.setPosition(x, y)) {
      PlayField parent = getParent();
      if (parent != null) {
	int px = Math.min(parent.getPreferredWidth() - parent.getWidth(),
			  Math.max(0, x - (parent.getWidth() - getWidth())/2));
	int py = Math.min(parent.getPreferredHeight() - parent.getHeight(),
			  Math.max(0, y - (parent.getHeight() - getHeight())/2));

	if ((px - parent.getXOffset()) > 1) {
	  px = parent.getXOffset() + 2;
	} else if ((px - parent.getXOffset()) < -1) {
	  px = parent.getXOffset() - 2;
	}
	if ((py - parent.getYOffset()) > 1) {
	  py = parent.getYOffset() + 2;
	} else if ((py - parent.getYOffset()) < -1) {
	  py = parent.getYOffset() - 2;
	}

	parent.setOffset(px, py);
      }
      return true;
    } else {
      return false;
    }
  }
}