ball.java

学习j2me写的,虽然在碰撞上处理的不好!但其中的技巧还是可以学习的1

/*
 * Ball.java
 *
 * Created on 2006年3月13日, 下午2:21
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */
package Creature;

import Snowball.*;
import java.lang.Math;
import java.util.Random;
import javax.microedition.lcdui.game.Sprite;

/**
 *
 * @author Administrator
 *
 */

public class Ball extends Creature{          
    
    /*
     *       参数
     */  
    private int Vx;//水平速度
    private int Vy;//垂直速度
    
    public int BallPower;   //子弹能量  初始能量
    public int BallDistance;//子弹距离  初始射程 10 加长后 15 
   
    //临时坐标记录
    public int TempX ;
    public int TempY ;
    
  
    /** Creates a new instance of Ball */
    public Ball(int x, int y, int WalkDir, Sprite ImageL, Sprite ImageR)
    {    
        super(x, y, WalkDir, ImageL, ImageR);
                
        //设置子弹参数              
        
        //速度
        Vx = 8;
        Vy = 1;
          
        //帧的宽，高
        frameWidth = 25;
        frameHeight = 5;  
        
        //状态
        State = false;    //逻辑状态
        DrawState = false;//绘画状态
       
        //射程
        BallDistance = 50;
        //子弹能量
        BallPower = 10;
    }
    
    public void Process(int TickCount){          
        Move(WalkDir);
        CheckBallDistance();
    }
      
    //移动
    private void Move(int WalkDir){        
        switch(WalkDir){
            case 0:
                //水平
                x = x - Vx;
                //垂直                            
                y = y + Vy;                 
                break;            
            case 1:
                //水平
                x = x + Vx; 
                //垂直                            
                y = y + Vy;
                break;
        }        
    }
   
    //判断子弹射程
    private void CheckBallDistance(){
        if( Math.abs(x  - TempX) >= BallDistance ){
           State = false;    //逻辑状态
           DrawState = false;//绘画状态           
        }
    }  
}