bulletsprite.java

星空大战,小车发出子弹打空中的飞行物。空中飞行物也 能发出子弹袭击小车。

import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.Sprite;

//子弹
public class BulletSprite extends Sprite
{
	private int dx;
	private int dy;
	
	private int type;
	
	public static final int TYPE_CAR = 0;
	public static final int TYPE_BLOBBO = 1;
	public static final int TYPE_JELLY = 2;
	public static final int TYPE_TIMMY = 3;
	
	public BulletSprite(int type)
    {
	    super(SpaceCanvas.sc.getImgBullets(), 11, 11);
	    
	    this.type = type;
	    this.setFrame(this.type);
	    
	    switch(type)
	    {
	    	case TYPE_CAR:
	    	{
	    		dx = 0;
	    		dy = -3;
	    		break;
	    	}
	    	case TYPE_BLOBBO:
	    	case TYPE_JELLY:
	    	{
	    		dx = 0;
	    		dy = 3;
	    		break;
	    	}
	    	case TYPE_TIMMY:
	    	{
	    		dx = 2;
	    		dy = 3;
	    		break;
	    	}
	    }
    }

	public void update()
	{
		this.move(dx, dy);
		
		checkBounds();
	}
	
	public void checkBounds() 
	{
		if (getX() < 0 || getX() > (SpaceCanvas.sc.getWidth() - getWidth())
				|| getY() < 0 || getY() > (SpaceCanvas.sc.getHeight() - getHeight()))
		{
			SpaceCanvas.sc.delBullet(this);
		}
	}
	
	public int getType()
	{
		return this.type;
	}
}