bullet.java

一个不错的动作类游戏

import javax.microedition.lcdui.*;

public class Bullet
{ 
  	Image[] imageFrames;
	Image image;
	int imageWidth;	
	int imageHeight;
	int canvasWidth;	
	int canvasHeight;
	protected static final String IMAGE_NAME="bullet";
	
	protected static final int RAW_FRAMES=1;
	protected int xPos;
	protected int yPos;  

	private static VaderManager layerManager;
	private static VaderCanvas gameCanvas;
	
	public Bullet(Player player)
	{
		imageFrames=VaderManager.getFrames(IMAGE_NAME, RAW_FRAMES);
		imageWidth=imageFrames[0].getWidth();
		imageHeight=imageFrames[0].getHeight();	
		xPos=player.getX()+(int)player.getWidth()/2;
		yPos=player.getY()-getHeight();
		setPosition(xPos, yPos);
		//gameCanvas=layerManager.getGameCanvas();
		createImage();
		setSpriteImage();
	}
  
    public int getHeight()				{return imageHeight;}
	public int getWidth()				{return imageWidth;}
	public int getCanvasHeight()		{return canvasHeight;}
	public int getCanvasWidth()			{return canvasWidth;}
	public Image getImage()				{return image;}
	private void setX(int x)			{xPos=x;}	
	private void setY(int y)			{yPos=y;}
	public int getX()					{return xPos;}	
	public int getY()					{return yPos;}
  
    public static void setLayerManager(VaderManager manager)		{layerManager=manager;}
  //public void setY(int y)										{this.setPosition(this.getX(), this.getY()+y);}

	private void setPosition(int x, int y)
	{
		setX(x);
		setY(y);
	}
	private void move(int x, int y)
	{
		setX(getX()+x);
		setY(getY()+y);  	
	}
	private void up()
	{
		move(0,-5);    
		if(this.getY()<0)
		{
			layerManager.removeLayer(this);
		}  
	}
	
	public void tick()
	{
		up();
	}
  
    private void createImage()
	{
		// allocate memory to store the onscreen background image.
		// assuming all tiles are the same size, make the buffer
		// the screen size plus one row and column.	
		image=Image.createImage(getWidth(), getHeight());
	}
	private void setSpriteImage()
	{
		Graphics g = image.getGraphics();
		g.drawImage(imageFrames[0],0,0,g.LEFT | g.TOP);
		
	}

}