装饰器模式

src/com/demo/tank/course9/Bullet.java

@@ -7,7 +7,6 @@ import com.demo.tank.util.ResourceManager;
 import java.awt.*;
 
 public class Bullet extends GameObject {
-    private int x, y;
     private Direction direction;
     private static final int SPEED = 10;
     public static final int WIDTH = ResourceManager.bulletD.getWidth();
@@ -52,13 +51,17 @@ public class Bullet extends GameObject {
 
     private void move() {
         switch (direction) {
-            case UP: y -= SPEED;
+            case UP:
+                y -= SPEED;
                 break;
-            case DOWN: y += SPEED;
+            case DOWN:
+                y += SPEED;
                 break;
-            case LEFT: x -= SPEED;
+            case LEFT:
+                x -= SPEED;
                 break;
-            case RIGHT: x += SPEED;
+            case RIGHT:
+                x += SPEED;
                 break;
             default:
                 break;
@@ -114,4 +117,13 @@ public class Bullet extends GameObject {
         this.group = group;
     }
 
+    @Override
+    public int getWidth() {
+        return WIDTH;
+    }
+
+    @Override
+    public int getHeight() {
+        return HEIGHT;
+    }
 }

src/com/demo/tank/course9/DefaultFireStrategy.java

@@ -8,7 +8,13 @@ public class DefaultFireStrategy implements FireStrategy {
     public void fire(Tank tank) {
         int bx = tank.getX() + Tank.WIDTH / 2 - Bullet.WIDTH / 2;
         int by = tank.getY() + Tank.HEIGHT / 2 - Bullet.HEIGHT / 2;
-        new Bullet(bx, by, tank.getDir(), tank.getGroup());
+//        new Bullet(bx, by, tank.getDir(), tank.getGroup());
+//        GameModel.getInstance().add(new RectDecorator(new Bullet(bx, by, tank.getDir(), tank.getGroup())));
+        GameModel.getInstance().add(new RectDecorator(
+                new TailDecorator(
+                        new Bullet(bx, by, tank.getDir(), tank.getGroup())
+                )
+        ));
         if (tank.getGroup() == Group.GOOD) new Thread(() -> new Audio("audio/tank_fire.wav").play()).start();
     }
 }

src/com/demo/tank/course9/Explode.java

@@ -6,7 +6,6 @@ import com.demo.tank.util.ResourceManager;
 import java.awt.*;
 
 public class Explode extends GameObject {
-    private int x, y;
     public static final int WIDTH = ResourceManager.explodes[0].getWidth();
     public static final int HEIGHT = ResourceManager.explodes[0].getHeight();
 
@@ -42,4 +41,11 @@ public class Explode extends GameObject {
         this.y = y;
     }
 
+    public int getWidth() {
+        return WIDTH;
+    }
+
+    public int getHeight() {
+        return HEIGHT;
+    }
 }

src/com/demo/tank/course9/GODecorator.java

@@ -0,0 +1,13 @@
+package com.demo.tank.course9;
+
+import java.awt.*;
+
+public abstract class GODecorator extends GameObject {
+    GameObject go;
+
+    public GODecorator(GameObject go) {
+        this.go = go;
+    }
+
+    public abstract void paint(Graphics g);
+}

src/com/demo/tank/course9/GameModel.java

@@ -10,6 +10,7 @@ import java.util.List;
 
 public class GameModel {
     private static final GameModel GM = new GameModel();
+
     static {
         GM.init();
     }
@@ -24,6 +25,7 @@ public class GameModel {
     private GameModel() {
 
     }
+
     private void init() {
         tank = new Tank(380, 660, Direction.UP, Group.GOOD);
         int enemyTankNum = PropertyManager.getInt("enemy.tank.number");

src/com/demo/tank/course9/GameObject.java

@@ -4,5 +4,10 @@ import java.awt.*;
 
 public abstract class GameObject {
     int x, y;
+
     public abstract void paint(Graphics g);
+
+    public abstract int getWidth();
+
+    public abstract int getHeight();
 }

src/com/demo/tank/course9/RectDecorator.java

@@ -0,0 +1,32 @@
+package com.demo.tank.course9;
+
+import java.awt.*;
+
+public class RectDecorator extends GODecorator {
+
+    public RectDecorator(GameObject go) {
+        super(go);
+    }
+
+    @Override
+    public void paint(Graphics g) {
+        //decorator x,y 也要跟随游戏物体 变化
+        this.x = go.x;
+        this.y = go.y;
+        go.paint(g);
+        Color c = g.getColor();
+        g.setColor(Color.MAGENTA);
+        g.drawRect(go.x, go.y, getWidth(), getHeight());
+        g.setColor(c);
+    }
+
+    @Override
+    public int getWidth() {
+        return super.go.getWidth();
+    }
+
+    @Override
+    public int getHeight() {
+        return super.go.getHeight();
+    }
+}

src/com/demo/tank/course9/TailDecorator.java

@@ -0,0 +1,31 @@
+package com.demo.tank.course9;
+
+import java.awt.*;
+
+public class TailDecorator extends GODecorator {
+
+    public TailDecorator(GameObject go) {
+        super(go);
+    }
+
+    @Override
+    public void paint(Graphics g) {
+        go.paint(g);
+        this.x = go.x;
+        this.y = go.y;
+        Color c = g.getColor();
+        g.setColor(Color.WHITE);
+        g.drawLine(go.x, go.y, go.x + getWidth(), go.y + getHeight());
+        g.setColor(c);
+    }
+
+    @Override
+    public int getWidth() {
+        return super.go.getWidth();
+    }
+
+    @Override
+    public int getHeight() {
+        return super.go.getHeight();
+    }
+}

src/com/demo/tank/course9/Tank.java

@@ -8,7 +8,6 @@ import java.awt.*;
 import java.util.Random;
 
 public class Tank extends GameObject {
-    private int x,y;
     int oldX, oldY;
     private Direction dir;
     private static final int SPEED = 8;
@@ -74,13 +73,17 @@ public class Tank extends GameObject {
         //如果没有移动 return
         if (!moving) return;
         switch (dir) {
-            case UP: y -= SPEED;
+            case UP:
+                y -= SPEED;
                 break;
-            case DOWN: y += SPEED;
+            case DOWN:
+                y += SPEED;
                 break;
-            case LEFT: x -= SPEED;
+            case LEFT:
+                x -= SPEED;
                 break;
-            case RIGHT: x += SPEED;
+            case RIGHT:
+                x += SPEED;
                 break;
             default:
                 break;
@@ -181,4 +184,12 @@ public class Tank extends GameObject {
         this.rect = rect;
     }
 
+    public int getWidth() {
+        return WIDTH;
+    }
+
+    public int getHeight() {
+        return HEIGHT;
+    }
+
 }

src/com/demo/tank/course9/TankTankCollider.java

@@ -4,6 +4,7 @@ import java.util.Random;
 
 public class TankTankCollider implements Collider {
     Random random = new Random();
+
     @Override
     public void collide(GameObject g1, GameObject g2) {
         if (g1 instanceof Tank && g2 instanceof Tank) {

src/com/demo/tank/course9/Wall.java

@@ -21,4 +21,12 @@ public class Wall extends GameObject{
         g.fillRect(x, y, width, height);
         g.setColor(c);
     }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
 }