bullet.java

来自「a modefied space invader game」· Java 代码 · 共 43 行

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

public class Bullet extends Sprite
{ 
  
  protected static final int RAW_FRAMES=1;
  protected int xPos;
  protected int yPos;  
  private static VaderManager layerManager;
  private static VaderCanvas gameCanvas;

  public Bullet(Image image, int width, int height, int xPos, int yPos)
  {
    super (image,width,height);
    this.yPos=yPos;
    this.xPos=xPos;
    gameCanvas=layerManager.getGameCanvas();
    setPosition(xPos, yPos);
  }
  
  public static void setLayerManager(VaderManager manager)		{layerManager=manager;}
  public void setY(int y)										{this.setPosition(this.getX(), this.getY()+y);}

  private void up()
  {
    move(0,-5);    
    if(this.getY()<0)
    {
    	layerManager.removeLayer(this);
    }  
  }
    
  public void tick()
  {
  	up();
  }

}