坦克大战中，给子弹加载图片

子弹类Missile

1.首先在src目录下新建一个文件夹Images，将图片拷贝到该文件夹下

2.在子弹类中添加以下代码：

 

private static Image[] missileImages=null;
 private static Toolkit tk=Toolkit.getDefaultToolkit();
 private static Map map=new HashMap();

//创建静态数组和静态Map 是为了不用没次新建类对象的时候都从硬盘将图片调到内存，一次调入后，以后直接从内存访问，提高访问速度
 static{
     missileImages=new Image[]{
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileL.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileLU.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileU.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileRU.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileR.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileRD.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileD.gif")),
       tk.getImage(Missile.class.getClassLoader().getResource("Images/missileLD.gif")),
     };
  map.put("L", missileImages[0]);
  map.put("LU", missileImages[1]);
  map.put("U", missileImages[2]);
  map.put("RU", missileImages[3]);
  map.put("R", missileImages[4]);
  map.put("RD", missileImages[5]);
  map.put("D", missileImages[6]);
  map.put("LD", missileImages[7]);
 }

 

//画子弹的方法

 

public void draw(Graphics g) {
  if(!live) {
   tc.missiles.remove(this);
   return;
  }

//根据子弹的方向画子弹
  switch(dir) {
  case L:
   g.drawImage(map.get("L"),x,y,null);
   break;
  case LU:
   g.drawImage(map.get("LU"),x,y,null);
   break;
  case U:
   g.drawImage(map.get("D"),x,y,null);
   break;
  case RU:
   g.drawImage(map.get("RU"),x,y,null);
   break;
  case R:
   g.drawImage(map.get("R"),x,y,null);
   break;
  case RD:
   g.drawImage(map.get("RD"),x,y,null);
   break;
  case D:
   g.drawImage(map.get("U"),x,y,null);
   break;
  case LD:
   g.drawImage(map.get("LD"),x,y,null);
   break;
  }
  //每画完一次，子弹移动一次
  move();
 }

 private 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;
   break;
  case STOP:
   break;
  }
  
  if(x < 0 || y < 0 || x > TankClient.GAME_WIDTH || y > TankClient.GAME_HEIGHT) {
   live = false;
  }
  
  
 }