游戏移动图片的转换

 1 package com.itheima.bean;
 2 
 3 public class Tank extends Element {
 4     private int speed = 64;
 5     Direction direction = Direction.UP;    //初始向上
 6 
 7     public Tank(int x, int y) {
 8         this.x = x;
 9         this.y = y;
10         this.imagePath = "res/img/tank_u.gif";
11 
12     }
13 
14     public void move(Direction dir) {
15         if (direction != dir) { //如果传进来的方向不等于当前方向
16             direction = dir;    
17             switch (dir) {    //根据方向转换图片
18             case UP:
19                 this.imagePath = "res/img/tank_u.gif";
20                 break;
21 
22             case DOWN:
23                 this.imagePath = "res/img/tank_d.gif";
24                 break;
25             case LEFT:
26                 this.imagePath = "res/img/tank_l.gif";
27                 break;
28             case RIGHT:
29                 this.imagePath = "res/img/tank_r.gif";
30                 break;
31             }
32             return ;    //不继续向下执行
33         }
34         switch (dir) {    //移动
35         case UP:
36             y -= speed;
37             break;
38 
39         case DOWN:
40             y += speed;
41             break;
42         case LEFT:
43             x -= speed;
44             break;
45         case RIGHT:
46             x += speed;
47             break;
48         }
49     }
50 }