tank.java

Tank 手机游戏 J2ME 简单么明了

package pack05;
import javax.microedition.lcdui.game.Sprite;
/**
 * 坦克类
 * @author 孙继磊
 *
 */
public class Tank extends Sprite {	
	private int speed=2;  //移动速度
	//移动方向
	public static final int UP=0;
	public static final int DOWN=1;
	public static final int LEFT=2;
	public static final int RIGHT=3;
	//当前移动方向
	private int currentDirection=RIGHT;
	//可以通过的地图上的元素种类(如水，草地等）
	private boolean [] canPassElements; 
	private MapContainer map;
	public Tank(MapContainer gameMap)
	{
		super(Utility.getImage("/Splash.png"));	
		super.defineReferencePixel(6, 6);		
		this.map=gameMap;
		System.out.println(this.getWidth()+","+this.getHeight());
		canPassElements=new boolean[MapContainer.MapObjectTypeNum+1];
		canPassElements[0]=true;
		canPassElements[MapContainer.STEEL]=true;
	}
	/**
	 * 尝试在地图上移动
	 * @param direction 要移动的方向
	 * @return 是否移动成功，如果遇到障碍或者边界则不成功
	 */
	public boolean tryMove(int direction)
	{
		changeDirection(direction);		
		int dx=0,dy=0;
		switch(direction)
		{
			case UP:dx=0;dy=-speed; break;
			case DOWN:dx=0;dy=speed; break;
			case LEFT:dx=-speed;dy=0; break;
			case RIGHT:dx=speed;dy=0; break;
		}
		this.move(dx,dy);
		if(map.isOutOfBorder(this))
		{			
			this.move(-dx, -dy);
			return false;
		}	
		int n;
		if((n=map.checkCollide(this))>0 )
		{
			if(!canPass(n))
				this.move(-dx, -dy);
			return false;
		}
		return true;
	}
	private boolean canPass(int element)
	{
		return canPassElements[element];
	}
	/**
	 * 改变移动方向，并在必要时旋转图片
	 * @param direction 新的移动方向
	 */
	private void changeDirection(int direction)
	{
		if(direction==currentDirection)
			return;
		currentDirection=direction;
		switch(direction)
		{
		case RIGHT:
			this.setTransform(Sprite.TRANS_NONE);
			break;
		case DOWN:
			setTransform(Sprite.TRANS_ROT90);
			break;
		case UP:
			setTransform(Sprite.TRANS_ROT270);
			break;
		case LEFT:
			setTransform(Sprite.TRANS_ROT180);
			break;
		}
	}
}