bullets.java

J2ME手机游戏,可以下下玩完,很好玩的.

package Src;
/*
 * 子弹类的实现
 */

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

import java.util.*;

public class Bullets extends Sprite {
	
	private int[][] num;//多子弹定义 
	private Random random;//随机的子弹运动方向
	private int thisx,thisy;//获得屏幕的位置大小
	private int Num;//子弹数量
	private int Defspeed;//默认速度，当轴上速度为0时用
	
	Bullets(Image e,int x,int y)
	{
		super(e,x,y);
		super.setRefPixelPosition(x/2, y/2);		
		random=new Random();
		Defspeed=2;
	}
	public void intonum(int Num,int x,int y)
	{
		this.Num=Num;
		this.thisx=x;
		this.thisy=y;
		
		num=new int[this.Num][4];
		for(int i=0;i<this.Num;i++)
		{
			    
				num[i][0]=(random.nextInt()&0x7fffffff)%thisx/2;
				num[i][1]=(random.nextInt()&0x7fffffff)%thisy/2;
				num[i][2]=(random.nextInt()&0x7fffffff)%3;
				num[i][3]=(random.nextInt()&0x7fffffff)%3;			 
		}
	}
	public void fly()
	{
		for(int i=0;i<Num;i++)
		{
				if(num[i][0]>=thisx)//判断到右边窗口拉
				{
					num[i][2]=num[i][2]*(-1);
				}
				if(num[i][1]>=thisy)//判断到下边窗口拉
				{
					num[i][3]=num[i][3]*(-1);
				}
				if(num[i][0]<=0)//判断到左边窗口拉
				{
					num[i][2]=num[i][2]*(-1);
				}
				if(num[i][1]<=0)//判断到上边窗口拉
				{
					num[i][3]=num[i][3]*(-1);
				}
				if(num[i][2]==0)
				{
					num[i][2]=Defspeed;
				}
				if(num[i][3]==0)
				{
					num[i][3]=Defspeed;
				}
				num[i][0]+=num[i][2];
				num[i][1]+=num[i][3];	
			 
		}
	}
	public void draw(Graphics g)
	{
		for(int i=0;i<Num;i++)
		{
			super.setPosition(num[i][0], num[i][1]);
			paint(g);
		}
	}
	
	public boolean collidesWith(Sprite plane)
	{
		for(int i=0;i<Num;i++)
		{
			this.setPosition(num[i][0], num[i][1]);
			if (this.collidesWith(plane,true))
			{
				return true;
			}
		}
		return false;
		
	}
	
}