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坦克大战(版本0.1-版本0.9)

版本0.1

功能：产生一个窗口

掌握：通过Eclipse建立新的项目为新的项目指定不同的源代码和输出目录指定项目所用的JDK版本通过Eclipse建立新的类

注意：类名和方法名的命名能够见名知意，类名首字母大写，方法名、变量名首字母小写，应用驼峰标识(多个单词组成第一个单词小写，其他单词首字母大写)

具体代码实现：

 1 import java.awt.Frame;
 2 
 3 public class TankClient extends Frame{
 4 
 5     public static void main(String[] args) {
 6         TankClient tc=new TankClient();
 7         tc.launchFrame();
 8     }
 9     public void launchFrame(){
10         this.setLocation(400,300);
11         this.setSize(800, 600);
12         setVisible(true);
13     }
14 }

版本0.2

功能：添加关闭窗口的事件处理,不允许窗口的大小改动

掌握：匿名类的用法思考：匿名类的应用场合？类短小、不涉及将来的扩展、不涉及重要的业务逻辑通过Eclipse重写父类的方法

注意：没掌握匿名类的先照抄，不写也行不影响最后的运行效果

具体代码实现：

 1 import java.awt.Frame;
 2 import java.awt.event.WindowAdapter;
 3 import java.awt.event.WindowEvent;
 4 
 5 public class TankClient extends Frame{
 6 
 7     public static void main(String[] args) {
 8         TankClient tc=new TankClient();
 9         tc.launchFrame();
10     }
11     public void launchFrame(){
12         this.setLocation(400,300);
13         this.setSize(800, 600);
14         this.addWindowListener(new WindowAdapter() {
15 
16             @Override
17             public void windowClosing(WindowEvent e) {
18                 
19                 System.exit(0);
20             }
21             
22         });
23         setResizable(false);
24         setVisible(true);
25     }
26 }

版本0.3

功能：画出代表坦克的实心圆

掌握：如何重写paint方法

注意：不要改变原来的前景色

回顾： paint(Graphics g)方法，窗口重画时自动调用 x轴、y轴的方向(X向右递增、Y向下递增)

具体代码实现：

 1 import java.awt.Color;
 2 import java.awt.Frame;
 3 import java.awt.Graphics;
 4 import java.awt.event.WindowAdapter;
 5 import java.awt.event.WindowEvent;
 6 
 7 public class TankClient extends Frame{
 8 
 9     //重写paint方法
10     @Override
11     public void paint(Graphics g) {
12         System.out.println(g.getColor());
13         //不要改变原来的前景色,先拿出来，使用以后再改回去
14         //getClolor返回的是this graphics context's current color
15         Color c=g.getColor();
16         g.setColor(Color.RED);
17         //四个参数分别代表Frame的左上角的x、y坐标，实心圆的宽width和高height
18         g.fillOval(50,50,30,30);
19         g.setColor(c);
20         
21     }
22     public static void main(String[] args) {
23         TankClient tc=new TankClient();
24         tc.launchFrame();
25     }
26     public void launchFrame(){
27         this.setLocation(400,300);
28         this.setSize(800, 600);
29         this.addWindowListener(new WindowAdapter() {
30 
31             @Override
32             public void windowClosing(WindowEvent e) {
33                 
34                 System.exit(0);
35             }
36             
37         });
38         setResizable(false);
39         //设置背景色
40         this.setBackground(Color.GREEN);
41         setVisible(true);
42     }
43 }

版本0.4

功能：让坦克运动起来

步骤：将位置改变为变量启动线程不断重画

思考：为什么使用线程重画，而不是每按下一个键进行一次重画？

因为线程重画更均匀，更能控制重画的速度。按键重画不能解决子弹自动飞行的问题。每次重画改变Tank位置

掌握：内部类的使用思考：内部类有哪些好处？什么时候使用内部类？可以方便的访问包装类的方法。不方便公开的，只为包装类服务的类应当定义为内部类。

注意： x, y值得含义，指的是小方块的左上角点

具体代码实现：

 1 import java.awt.Color;
 2 import java.awt.Frame;
 3 import java.awt.Graphics;
 4 import java.awt.event.WindowAdapter;
 5 import java.awt.event.WindowEvent;
 6 
 7 public class TankClient extends Frame{
 8     //将坦克的位置设置为变量
 9     int x=50;
10     int y=50;
11 
12     //重写paint方法
13     @Override
14     public void paint(Graphics g) {
15         //不要改变原来的前景色,先拿出来，使用以后再改回去
16         //getClolor返回的是this graphics context's current color
17         Color c=g.getColor();
18         g.setColor(Color.RED);
19         //四个参数分别代表Frame的左上角的x、y坐标，实心圆的宽width和高
20         g.fillOval(x,y,30,30);
21         g.setColor(c);
22         y+=5;
23     }
24     public static void main(String[] args) {
25         TankClient tc=new TankClient();
26         tc.launchFrame();
27     }
28     public void launchFrame(){
29         //窗体位置
30         this.setLocation(400,300);
31         //窗体尺寸大小
32         this.setSize(800, 600);
33         //窗体title名称
34         this.setTitle("TankWar");
35         this.addWindowListener(new WindowAdapter() {
36 
37             @Override
38             public void windowClosing(WindowEvent e) {
39                 
40                 System.exit(0);
41             }
42             
43         });
44         setResizable(false);
45         //设置背景色
46         this.setBackground(Color.GREEN);
47         setVisible(true);
48         new Thread(new PaintThread()).start();
49     }
50     //使用内部类，只为包装类复位
51     private class PaintThread implements Runnable{
52 
53         @Override
54         public void run() {
55             //重画，内部会自动调用paint(Graphics g)方法
56             repaint();
57             try {
58                 Thread.sleep(100);
59             } catch (InterruptedException e) {
60                 e.printStackTrace();
61             }
62         }
63         
64     }
65 }

版本0.4.1

功能：使用双缓冲消除闪烁现象

原因：刷新重画频率太快,paint方法还没有完成逐条显示

解决办法：将所有东西画在虚拟图片上,一次性显示出来

注意：如果不能理解透彻就照抄本版本代码，不影响对J2SE的练习功效

具体代码实现：

 1 import java.awt.Color;
 2 import java.awt.Frame;
 3 import java.awt.Graphics;
 4 import java.awt.Image;
 5 import java.awt.event.WindowAdapter;
 6 import java.awt.event.WindowEvent;
 7 
 8 public class TankClient extends Frame {
 9     // 将坦克的位置设置为变量
10     int x = 50;
11     int y = 50;
12     Image offScreenImage = null;
13 
14     // 重写paint方法
15     @Override
16     public void paint(Graphics g) {
17         // 不要改变原来的前景色,先拿出来，使用以后再改回去
18         // getClolor返回的是this graphics context's current color
19         Color c = g.getColor();
20         g.setColor(Color.RED);
21         // 四个参数分别代表Frame的左上角的x、y坐标，实心圆的宽width和高
22         g.fillOval(x, y, 30, 30);
23         g.setColor(c);
24         y += 50;
25     }
26 
27     @Override
28     public void update(Graphics g) {
29         if (offScreenImage == null) {
30             // 创建的虚拟图片大小
31             offScreenImage = this.createImage(800, 600);
32         }
33         Graphics gOffScreen = offScreenImage.getGraphics();
34         Color c=gOffScreen.getColor();
35         gOffScreen.setColor(Color.GREEN);
36         gOffScreen.fillRect(0, 0, 800, 600);
37         gOffScreen.setColor(c);
38         paint(gOffScreen);
39         g.drawImage(offScreenImage, 0, 0, null);
40     }
41 
42     public static void main(String[] args) {
43         TankClient tc = new TankClient();
44         tc.launchFrame();
45     }
46 
47     public void launchFrame() {
48         // 窗体位置
49         this.setLocation(400, 300);
50         // 窗体尺寸大小
51         this.setSize(800, 600);
52         // 窗体title名称
53         this.setTitle("TankWar");
54         this.addWindowListener(new WindowAdapter() {
55 
56             @Override
57             public void windowClosing(WindowEvent e) {
58 
59                 System.exit(0);
60             }
61 
62         });
63         setResizable(false);
64         // 设置背景色
65         this.setBackground(Color.GREEN);
66         setVisible(true);
67         new Thread(new PaintThread()).start();
68     }
69 
70     // 使用内部类，只为包装类复位
71     private class PaintThread implements Runnable {
72 
73         @Override
74         public void run() {
75             // 重画，内部会自动调用paint(Graphics g)方法
76             repaint();
77             try {
78                 Thread.sleep(50);
79             } catch (InterruptedException e) {
80                 e.printStackTrace();
81             }
82         }
83 
84     }
85 }

版本0.5

功能：代码重构，将以后可能需要多处改变的量定义为常量，Frame的宽度和高度(常量名一般大写)

注意：常量一般是public static final的。

具体代码实现：

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 
 4 public class TankClient extends Frame {
 5     public static final int GAME_WIDTH = 800;
 6     public static final int GAME_HEIGHT = 600;
 7     
 8     int x = 50, y = 50;
 9     
10     Image offScreenImage = null;
11     
12     public void paint(Graphics g) {
13         Color c = g.getColor();
14         g.setColor(Color.RED);
15         g.fillOval(x, y, 30, 30);
16         g.setColor(c);
17         
18         y += 5;
19     }
20     
21     public void update(Graphics g) {
22         if(offScreenImage == null) {
23             offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT);
24         }
25         Graphics gOffScreen = offScreenImage.getGraphics();
26         Color c = gOffScreen.getColor();
27         gOffScreen.setColor(Color.GREEN);
28         gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
29         gOffScreen.setColor(c);
30         paint(gOffScreen);
31         g.drawImage(offScreenImage, 0, 0, null);
32     }
33 
34     public void lauchFrame() {
35         this.setLocation(400, 300);
36         this.setSize(GAME_WIDTH, GAME_HEIGHT);
37         this.setTitle("TankWar");
38         this.addWindowListener(new WindowAdapter() {
39             public void windowClosing(WindowEvent e) {
40                 System.exit(0);
41             }
42         });
43         this.setResizable(false);
44         this.setBackground(Color.GREEN);
45         setVisible(true);
46         
47         new Thread(new PaintThread()).start();
48     }
49 
50     public static void main(String[] args) {
51         TankClient tc = new TankClient();
52         tc.lauchFrame();
53     }
54     
55     private class PaintThread implements Runnable {
56 
57         public void run() {
58             while(true) {
59                 repaint();
60                 try {
61                     Thread.sleep(50);
62                 } catch (InterruptedException e) {
63                     e.printStackTrace();
64                 }
65             }
66         }
67     }
68 
69 }

View Code

版本0.6

功能：让坦克听从我们的指挥，添加键盘监听器类KeyMonitor TankCient添加键盘监听器，针对不同的键改变坦克的位置，与重画线程结合产生不同方向运动

注意： switch case语句中break语句的运用，写程序要循序渐进

具体代码实现：

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 
 4 public class TankClient extends Frame {
 5     public static final int GAME_WIDTH = 800;
 6     public static final int GAME_HEIGHT = 600;
 7     
 8     int x = 50, y = 50;
 9     
10     Image offScreenImage = null;
11     
12     public void paint(Graphics g) {
13         Color c = g.getColor();
14         g.setColor(Color.RED);
15         g.fillOval(x, y, 30, 30);
16         g.setColor(c);
17     }
18     
19     public void update(Graphics g) {
20         if(offScreenImage == null) {
21             offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT);
22         }
23         Graphics gOffScreen = offScreenImage.getGraphics();
24         Color c = gOffScreen.getColor();
25         gOffScreen.setColor(Color.GREEN);
26         gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
27         gOffScreen.setColor(c);
28         paint(gOffScreen);
29         g.drawImage(offScreenImage, 0, 0, null);
30     }
31 
32     public void lauchFrame() {
33         this.setLocation(400, 300);
34         this.setSize(GAME_WIDTH, GAME_HEIGHT);
35         this.setTitle("TankWar");
36         this.addWindowListener(new WindowAdapter() {
37             public void windowClosing(WindowEvent e) {
38                 System.exit(0);
39             }
40         });
41         this.setResizable(false);
42         this.setBackground(Color.GREEN);
43         
44         this.addKeyListener(new KeyMonitor());
45         
46         setVisible(true);
47         
48         new Thread(new PaintThread()).start();
49     }
50 
51     public static void main(String[] args) {
52         TankClient tc = new TankClient();
53         tc.lauchFrame();
54     }
55     
56     private class PaintThread implements Runnable {
57 
58         public void run() {
59             while(true) {
60                 repaint();
61                 try {
62                     Thread.sleep(50);
63                 } catch (InterruptedException e) {
64                     e.printStackTrace();
65                 }
66             }
67         }
68     }
69     
70     private class KeyMonitor extends KeyAdapter {
71 
72         public void keyPressed(KeyEvent e) {
73             int key = e.getKeyCode();
74             switch(key) {
75             case KeyEvent.VK_LEFT :
76                 x -= 5;
77                 break;
78             case KeyEvent.VK_UP :
79                 y -= 5;
80                 break;
81             case KeyEvent.VK_RIGHT :
82                 x += 5;
83                 break;
84             case KeyEvent.VK_DOWN :
85                 y += 5;
86                 break;
87             }
88         }
89         
90     }
91 }

View Code

版本0.7

功能：将坦克单独包装成类(Tank)

步骤：建立Tank类;为Tank类添加成员变量x、y;添加draw方法,使Tank类独立控制自己的画法;添加Tank类处理按键的方法;根据Tank类修改TankClient类

掌握：面向对象的思考方法,细节隐藏、构建单独的类、首先考虑系统中有哪些类?合适的方法应该出现在合适的类中;

具体代码实现：

Tank:

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 
 4 public class Tank {
 5     int x;
 6     int y;
 7     public Tank(int x, int y) {
 8         this.x = x;
 9         this.y = y;
10     }
11     public void draw(Graphics g){
12         Color c=g.getColor();
13         g.setColor(Color.RED);
14         g.fillOval(x, y, 30, 30);
15         g.setColor(c);
16     }
17     //坦克自己向哪个方向移动，它自己最清楚;
18     public void KeyPressed(KeyEvent e){
19         //获得所按下的键所对应的虚拟码:
20         //Returns the integer keyCode associated with the key in this event
21         int key = e.getKeyCode();
22         //判断不同的按键，指挥坦克的运动方向
23         switch(key) {
24         case KeyEvent.VK_LEFT :
25             x -= 5;
26             break;
27         case KeyEvent.VK_UP :
28             y -= 5;
29             break;
30         case KeyEvent.VK_RIGHT :
31             x += 5;
32             break;
33         case KeyEvent.VK_DOWN :
34             y += 5;
35             break;
36         }
37     }
38 }

View Code

TankClient:

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 
 4 public class TankClient extends Frame {
 5     //设置成常量，方便以后的改动
 6     public static final int GAME_WIDTH = 800;
 7     public static final int GAME_HEIGHT = 600;
 8     Tank myTank=new Tank(50, 50);
 9     
10     //定义虚拟图片，方便后期的一次性显示
11     Image offScreenImage = null;
12     
13     public void paint(Graphics g) {
14         //不改变前景色
15         myTank.draw(g);
16     }
17     
18     //刷新操作
19     public void update(Graphics g) {
20         if(offScreenImage == null) {
21             offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT);
22         }
23         Graphics gOffScreen = offScreenImage.getGraphics();
24         Color c = gOffScreen.getColor();
25         gOffScreen.setColor(Color.GREEN);
26         gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
27         gOffScreen.setColor(c);
28         paint(gOffScreen);
29         g.drawImage(offScreenImage, 0, 0, null);
30     }
31 
32     public void lauchFrame() {
33         this.setLocation(400, 300);
34         this.setSize(GAME_WIDTH, GAME_HEIGHT);
35         this.setTitle("TankWar");
36         this.addWindowListener(new WindowAdapter() {
37             public void windowClosing(WindowEvent e) {
38                 System.exit(0);
39             }
40         });
41         this.setResizable(false);
42         this.setBackground(Color.GREEN);
43         
44         this.addKeyListener(new KeyMonitor());
45         
46         setVisible(true);
47         
48         new Thread(new PaintThread()).start();
49     }
50 
51     public static void main(String[] args) {
52         TankClient tc = new TankClient();
53         tc.lauchFrame();
54     }
55     
56     private class PaintThread implements Runnable {
57 
58         public void run() {
59             while(true) {
60                 repaint();
61                 try {
62                     Thread.sleep(50);
63                 } catch (InterruptedException e) {
64                     e.printStackTrace();
65                 }
66             }
67         }
68     }
69     
70     //创建键盘时间监听
71     private class KeyMonitor extends KeyAdapter {
72 
73         //直接调用myTank自己的方法根据相应的按键信息进行移动
74         public void keyPressed(KeyEvent e) {
75             myTank.KeyPressed(e);
76         }
77         
78     }
79 }

View Code

版本0.8

功能：让主战坦克向8个方向行走(左、右、上、下、左上、左下、右上、右下)

步骤: 添加记录按键状态的布尔量;添加代表方向的量（使用枚举);根据按键状态确定Tank方向;根据方向进行下一步的移动（move）;

Tank:

  1 import java.awt.*;
  2 import java.awt.event.*;
  3 
  4 public class Tank {
  5     // 方便后期更改
  6     public static final int XSPEED = 5;
  7     public static final int YSPEED = 5;
  8     private int x;
  9     private int y;
 10     // 添加记录按键状态的布尔量
 11     private boolean bL = false;
 12     private boolean bR = false;
 13     private boolean bU = false;
 14     private boolean bD = false;
 15 
 16     // 添加代表方向的量（使用枚举）
 17     enum Direction {
 18         L, R, U, D, LU, LD, RU, RD, STOP
 19     };
 20 
 21     private Direction dir = Direction.STOP;
 22 
 23     public Tank(int x, int y) {
 24         this.x = x;
 25         this.y = y;
 26     }
 27 
 28     // Tank对象的draw方法
 29     public void draw(Graphics g) {
 30         Color c = g.getColor();
 31         g.setColor(Color.RED);
 32         g.fillOval(x, y, 30, 30);
 33         g.setColor(c);
 34         move();
 35     }
 36 
 37     public void move() {
 38         switch (dir) {
 39         case L:
 40             x -= XSPEED;
 41             break;
 42         case R:
 43             x += XSPEED;
 44             break;
 45         case U:
 46             y -= YSPEED;
 47             break;
 48         case D:
 49             y += YSPEED;
 50             break;
 51         case LU:
 52             x -= XSPEED;
 53             y -= YSPEED;
 54             break;
 55         case LD:
 56             x -= XSPEED;
 57             y += YSPEED;
 58             break;
 59         case RU:
 60             x += XSPEED;
 61             y -= YSPEED;
 62             break;
 63         case RD:
 64             x += XSPEED;
 65             y += YSPEED;
 66             break;
 67 
 68         case STOP:
 69             break;
 70         }
 71     }
 72 
 73     public void locateDirection() {
 74         if (bL && !bU && !bR && !bD)
 75             dir = Direction.L;
 76         else if (bL && bU && !bR && !bD)
 77             dir = Direction.LU;
 78         else if (!bL && bU && !bR && !bD)
 79             dir = Direction.U;
 80         else if (!bL && bU && bR && !bD)
 81             dir = Direction.RU;
 82         else if (!bL && !bU && bR && !bD)
 83             dir = Direction.R;
 84         else if (!bL && !bU && bR && bD)
 85             dir = Direction.RD;
 86         else if (!bL && !bU && !bR && bD)
 87             dir = Direction.D;
 88         else if (bL && !bU && !bR && bD)
 89             dir = Direction.LD;
 90         else if (!bL && !bU && !bR && !bD)
 91             dir = Direction.STOP;
 92 
 93     }
 94 
 95     // 坦克自己向哪个方向移动，它自己最清楚;
 96     public void KeyPressed(KeyEvent e) {
 97         // 获得所按下的键所对应的虚拟码:
 98         // Returns the integer keyCode associated with the key in this event
 99         int key = e.getKeyCode();
100         // 判断不同的按键，指挥坦克的运动方向
101         switch (key) {
102         case KeyEvent.VK_LEFT:
103             bL = true;
104             break;
105         case KeyEvent.VK_UP:
106             bU = true;
107             break;
108         case KeyEvent.VK_RIGHT:
109             bR = true;
110             break;
111         case KeyEvent.VK_DOWN:
112             bD = true;
113             break;
114         }
115         locateDirection();
116     }
117 }

View Code

TankClient:

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 
 4 public class TankClient extends Frame {
 5     // 设置成常量，方便以后的改动
 6     public static final int GAME_WIDTH = 800;
 7     public static final int GAME_HEIGHT = 600;
 8     Tank myTank = new Tank(50, 50);
 9 
10     // 定义虚拟图片，方便后期的一次性显示
11     Image offScreenImage = null;
12 
13     public void paint(Graphics g) {
14         // 不改变前景色
15         myTank.draw(g);
16     }
17 
18     // 刷新操作
19     public void update(Graphics g) {
20         if (offScreenImage == null) {
21             offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT);
22         }
23         Graphics gOffScreen = offScreenImage.getGraphics();
24         Color c = gOffScreen.getColor();
25         gOffScreen.setColor(Color.GREEN);
26         gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
27         gOffScreen.setColor(c);
28         paint(gOffScreen);
29         g.drawImage(offScreenImage, 0, 0, null);
30     }
31 
32     public void lauchFrame() {
33         this.setLocation(400, 300);
34         this.setSize(GAME_WIDTH, GAME_HEIGHT);
35         this.setTitle("TankWar");
36         this.addWindowListener(new WindowAdapter() {
37             public void windowClosing(WindowEvent e) {
38                 System.exit(0);
39             }
40         });
41         this.setResizable(false);
42         this.setBackground(Color.GREEN);
43 
44         this.addKeyListener(new KeyMonitor());
45 
46         setVisible(true);
47 
48         new Thread(new PaintThread()).start();
49     }
50 
51     public static void main(String[] args) {
52         TankClient tc = new TankClient();
53         tc.lauchFrame();
54     }
55 
56     private class PaintThread implements Runnable {
57 
58         public void run() {
59             while (true) {
60                 repaint();
61                 try {
62                     Thread.sleep(50);
63                 } catch (InterruptedException e) {
64                     e.printStackTrace();
65                 }
66             }
67         }
68     }
69 
70     // 创建键盘时间监听
71     private class KeyMonitor extends KeyAdapter {
72 
73         // 直接调用myTank自己的方法根据相应的按键信息进行移动
74         public void keyPressed(KeyEvent e) {
75             myTank.KeyPressed(e);
76         }
77 
78     }
79 }

View Code

按下按键->KeyPressed监听->按键状态发生改变->locateDirection()函数->dir的值会发生改变->进而当调用move方法的时候执行相应的操作;

版本0.9

我们在版本0.8中，按下某个键的时候，记录按键状态的布尔量一直是true，我们无法改变坦克的移动方向了,在版本0.9中我们做下处理

功能：让主战坦克向8个方向行走

步骤：处理键抬起的消息修改TankClient相关代码

Tank：

  1 import java.awt.*;
  2 import java.awt.event.*;
  3 
  4 public class Tank {
  5     // 方便后期更改
  6     public static final int XSPEED = 5;
  7     public static final int YSPEED = 5;
  8     private int x;
  9     private int y;
 10     // 添加记录按键状态的布尔量
 11     private boolean bL = false;
 12     private boolean bR = false;
 13     private boolean bU = false;
 14     private boolean bD = false;
 15 
 16     // 添加代表方向的量（使用枚举）
 17     enum Direction {
 18         L, R, U, D, LU, LD, RU, RD, STOP
 19     };
 20 
 21     private Direction dir = Direction.STOP;
 22 
 23     public Tank(int x, int y) {
 24         this.x = x;
 25         this.y = y;
 26     }
 27 
 28     // Tank对象的draw方法
 29     public void draw(Graphics g) {
 30         Color c = g.getColor();
 31         g.setColor(Color.RED);
 32         g.fillOval(x, y, 30, 30);
 33         g.setColor(c);
 34         move();
 35     }
 36 
 37     public void move() {
 38         switch (dir) {
 39         case L:
 40             x -= XSPEED;
 41             break;
 42         case R:
 43             x += XSPEED;
 44             break;
 45         case U:
 46             y -= YSPEED;
 47             break;
 48         case D:
 49             y += YSPEED;
 50             break;
 51         case LU:
 52             x -= XSPEED;
 53             y -= YSPEED;
 54             break;
 55         case LD:
 56             x -= XSPEED;
 57             y += YSPEED;
 58             break;
 59         case RU:
 60             x += XSPEED;
 61             y -= YSPEED;
 62             break;
 63         case RD:
 64             x += XSPEED;
 65             y += YSPEED;
 66             break;
 67 
 68         case STOP:
 69             break;
 70         }
 71     }
 72 
 73     public void locateDirection() {
 74         if (bL && !bU && !bR && !bD)
 75             dir = Direction.L;
 76         else if (bL && bU && !bR && !bD)
 77             dir = Direction.LU;
 78         else if (!bL && bU && !bR && !bD)
 79             dir = Direction.U;
 80         else if (!bL && bU && bR && !bD)
 81             dir = Direction.RU;
 82         else if (!bL && !bU && bR && !bD)
 83             dir = Direction.R;
 84         else if (!bL && !bU && bR && bD)
 85             dir = Direction.RD;
 86         else if (!bL && !bU && !bR && bD)
 87             dir = Direction.D;
 88         else if (bL && !bU && !bR && bD)
 89             dir = Direction.LD;
 90         else if (!bL && !bU && !bR && !bD)
 91             dir = Direction.STOP;
 92 
 93     }
 94 
 95     // 坦克自己向哪个方向移动，它自己最清楚;
 96     public void KeyPressed(KeyEvent e) {
 97         // 获得所按下的键所对应的虚拟码:
 98         // Returns the integer keyCode associated with the key in this event
 99         int key = e.getKeyCode();
100         // 判断不同的按键，指挥坦克的运动方向
101         switch (key) {
102         case KeyEvent.VK_LEFT:
103             bL = true;
104             break;
105         case KeyEvent.VK_UP:
106             bU = true;
107             break;
108         case KeyEvent.VK_RIGHT:
109             bR = true;
110             break;
111         case KeyEvent.VK_DOWN:
112             bD = true;
113             break;
114         }
115         locateDirection();
116     }
117 
118     public void keyReleased(KeyEvent e) {
119         int key = e.getKeyCode();
120         // 判断不同的按键，指挥坦克的运动方向
121         // 哪个键按下了，就把对应方向的布尔类型置为false
122         switch (key) {
123         case KeyEvent.VK_LEFT:
124             bL = false;
125             break;
126         case KeyEvent.VK_UP:
127             bU = false;
128             break;
129         case KeyEvent.VK_RIGHT:
130             bR = false;
131             break;
132         case KeyEvent.VK_DOWN:
133             bD = false;
134             break;
135         }
136         // 重新定位一下
137         locateDirection();
138     }
139 }

View Code

TankClient:

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 
 4 public class TankClient extends Frame {
 5     // 设置成常量，方便以后的改动
 6     public static final int GAME_WIDTH = 800;
 7     public static final int GAME_HEIGHT = 600;
 8     Tank myTank = new Tank(50, 50);
 9 
10     // 定义虚拟图片，方便后期的一次性显示
11     Image offScreenImage = null;
12 
13     public void paint(Graphics g) {
14         // 不改变前景色
15         myTank.draw(g);
16     }
17 
18     // 刷新操作
19     public void update(Graphics g) {
20         if (offScreenImage == null) {
21             offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT);
22         }
23         Graphics gOffScreen = offScreenImage.getGraphics();
24         Color c = gOffScreen.getColor();
25         gOffScreen.setColor(Color.GREEN);
26         gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
27         gOffScreen.setColor(c);
28         paint(gOffScreen);
29         g.drawImage(offScreenImage, 0, 0, null);
30     }
31 
32     public void lauchFrame() {
33         this.setLocation(400, 300);
34         this.setSize(GAME_WIDTH, GAME_HEIGHT);
35         this.setTitle("TankWar");
36         this.addWindowListener(new WindowAdapter() {
37             public void windowClosing(WindowEvent e) {
38                 System.exit(0);
39             }
40         });
41         this.setResizable(false);
42         this.setBackground(Color.GREEN);
43 
44         this.addKeyListener(new KeyMonitor());
45 
46         setVisible(true);
47 
48         new Thread(new PaintThread()).start();
49     }
50 
51     public static void main(String[] args) {
52         TankClient tc = new TankClient();
53         tc.lauchFrame();
54     }
55 
56     private class PaintThread implements Runnable {
57 
58         public void run() {
59             while (true) {
60                 repaint();
61                 try {
62                     Thread.sleep(50);
63                 } catch (InterruptedException e) {
64                     e.printStackTrace();
65                 }
66             }
67         }
68     }
69 
70     // 创建键盘时间监听
71     private class KeyMonitor extends KeyAdapter {
72 
73         // 直接调用myTank自己的方法根据相应的按键信息进行移动
74         public void keyPressed(KeyEvent e) {
75             myTank.KeyPressed(e);
76             // 添加了处理键抬起的事件，可以控制坦克起步以后的状态
77             // 而不是一直按照一个方向走下去
78         }
79         public void keyReleased(KeyEvent e){
80             myTank.keyReleased(e);
81         }
82 
83     }
84 }

View Code

未完待续。。。。。。

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原文地址：https://www.cnblogs.com/ysw-go/p/5503281.html