day3，子弹发射位置改至坦克中间

tankWar/src/com/mashibing/tank/Bullet.java

@@ -9,8 +9,8 @@ import java.awt.*;
  */
 public class Bullet {
     private static final int SPEED = 10;
-    private static final int WIDTH = 20;
-    private static final int HEIGHT = 20;
+    public static int WIDTH = ResourceImageRead.BULLET_DOWN.getWidth();
+    public static int HEIGHT = ResourceImageRead.BULLET_DOWN.getHeight();
 
     private int x;
     private int y;
@@ -31,15 +31,28 @@ public class Bullet {
             frameTank.bulletList.remove(this);
         }
 
-        Color color = g.getColor();
-        g.setColor(Color.RED);
-        g.fillOval(x, y, WIDTH, HEIGHT);
-        g.setColor(color);
+        // 画出坦克前后左右移动的图片
+        switch (direction) {
+            case LEFT:
+                g.drawImage(ResourceImageRead.BULLET_LEFT, x, y, null);
+                break;
+            case UP:
+                g.drawImage(ResourceImageRead.BULLET_UP, x, y, null);
+                break;
+            case RIGHT:
+                g.drawImage(ResourceImageRead.BULLET_RIGHT, x, y, null);
+                break;
+            case DOWN:
+                g.drawImage(ResourceImageRead.BULLET_DOWN, x, y, null);
+                break;
+        }
+
+        // 子弹移动
         move();
     }
 
     private void move() {
-        // 定义坦克的移动特征
+        // 定义子弹的移动特征
         switch (direction) {
             case LEFT:
                 x -= SPEED;

tankWar/src/com/mashibing/tank/ResourceImageRead.java

@@ -14,14 +14,25 @@ public class ResourceImageRead {
     public static BufferedImage TANK_UP;
     public static BufferedImage TANK_RIGHT;
     public static BufferedImage TANK_DOWN;
+    public static BufferedImage BULLET_LEFT;
+    public static BufferedImage BULLET_UP;
+    public static BufferedImage BULLET_RIGHT;
+    public static BufferedImage BULLET_DOWN;
 
     // 当ResourceImageRead类加载时，静态代码块执行，直接初始化
     static {
         try {
+            // 赋值坦克图片
             TANK_LEFT = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/tankL.gif"));
             TANK_UP = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/tankU.gif"));
             TANK_RIGHT = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/tankR.gif"));
             TANK_DOWN = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/tankD.gif"));
+
+            // 赋值子弹图片
+            BULLET_LEFT = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/bulletL.gif"));
+            BULLET_UP = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/bulletU.gif"));
+            BULLET_RIGHT = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/bulletR.gif"));
+            BULLET_DOWN = ImageIO.read(ResourceImageRead.class.getClassLoader().getResourceAsStream("images/bulletD.gif"));
         } catch (IOException e) {
             e.printStackTrace();
         }

tankWar/src/com/mashibing/tank/Tank.java

@@ -9,6 +9,9 @@ import java.awt.*;
  */
 public class Tank {
     private static final int SPEED = 5;
+    public static int WIDTH = ResourceImageRead.TANK_DOWN.getWidth();
+    public static int HEIGHT = ResourceImageRead.TANK_DOWN.getHeight();
+
     private int x;
     private int y;
     private Direction direction;
@@ -79,8 +82,11 @@ public class Tank {
      * 解决：坦克对象要持有FrameTank对象的引用
      */
     public void fire() {
+        int bulletX = this.x + Tank.WIDTH / 2 - Bullet.WIDTH / 2;
+        int bulletY = this.y + Tank.HEIGHT / 2 - Bullet.HEIGHT / 2;
+
         // 将子弹加入子弹集合
-        frameTank.bulletList.add(new Bullet(this.x, this.y, this.direction, this.frameTank));
+        frameTank.bulletList.add(new Bullet(bulletX, bulletY, this.direction, this.frameTank));
     }
 
     public Direction getDirection() {

tankWar/src/test/ImageTest.java

@@ -3,7 +3,6 @@ package test;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.awt.image.BufferedImage;
-import java.io.File;
 import java.io.IOException;
 
 import javax.imageio.ImageIO;