ball.java

自己编写的一个简单的tank游戏

import java.awt.*;

public class Ball {

	public static final int BWIDTH=10;
	public static final int BHEIGHT=10;
	public static final int XSPEED=10;
	public static final int YSPEED=10;
	
	int x,y;
	Tank.Direction dir;
	TankGameFrame tgf;
	
	public Ball(int x,int y,Tank.Direction dir)
	{
		this.x=x;
		this.y=y;
		this.dir=dir;

	}
	public Ball(int x,int y,Tank.Direction dir,TankGameFrame tgf)
	{
		this(x,y,dir);
		this.tgf=tgf;
	}
	
	public void draw(Graphics g)
	{
		Color c=g.getColor();
		g.setColor(Color.orange);
		g.fillOval(x,y,BWIDTH,BHEIGHT);
		g.setColor(c);
		
		move();
	}
	void move()
	{
		switch(dir)
		{
			case L:
			x-=XSPEED;
			break;
			case LU:
			x-=XSPEED;
			y-=YSPEED;
			break;
			case U:
			y-=YSPEED;
			break;
			case RU:
			x+=XSPEED;
			y-=YSPEED;
			break;
			case R:
			x+=XSPEED;
			break;
			case RD:
			x+=XSPEED;
			y+=YSPEED;
			break;
			case D:
			y+=YSPEED;
			break;
			case LD:
			x-=XSPEED;
			y+=YSPEED;	

	       }
		if(x<0||y<0||x>tgf.GAME_W||y>tgf.GAME_H)
		{
			tgf.balls.remove(this);
		}

	}

}