Android实战打飞机游戏之怪物(敌机)类的实现(4)

先看看效果图：

分析: 根据敌机类型区分 敌机 运动逻辑 以及绘制

public class Enemy {
  // 敌机的种类标识
  public int type;
  // 苍蝇
  public static final int TYPE_FLY = 1;
  // 鸭子(从左往右运动)
  public static final int TYPE_DUCKL = 2;
  // 鸭子(从右往左运动)
  public static final int TYPE_DUCKR = 3;
  // 敌机图片资源
  public Bitmap bmpEnemy;
  // 敌机坐标
  public int x, y;
  // 敌机每帧的宽高
  public int frameW, frameH;
  // 敌机当前帧下标
  private int frameIndex;
  // 敌机的移动速度
  private int speed;;
  // 判断敌机是否已经出屏
  public boolean isDead;
  // 敌机的构造函数
  public Enemy(Bitmap bmpEnemy, int enemyType, int x, int y) {
    this.bmpEnemy = bmpEnemy;
    frameW = bmpEnemy.getWidth() / 10;
    frameH = bmpEnemy.getHeight();
    this.type = enemyType;
    this.x = x;
    this.y = y;
    // 不同种类的敌机血量不同
    switch (type) {
    // 苍蝇
    case TYPE_FLY:
      speed = 25;
      break;
    // 鸭子
    case TYPE_DUCKL:
      speed = 3;
      break;
    case TYPE_DUCKR:
      speed = 3;
      break;
    }
  }
  // 敌机绘图函数
  public void draw(Canvas canvas, Paint paint) {
    canvas.save();
    canvas.clipRect(x, y, x + frameW, y + frameH);
    canvas.drawBitmap(bmpEnemy, x - frameIndex * frameW, y, paint);
    canvas.restore();
  }
  // 敌机逻辑AI
  public void logic() {
    // 不断循环播放帧形成动画
    frameIndex++;
    if (frameIndex >= 10) {
      frameIndex = 0;
    }
    // 不同种类的敌机拥有不同的AI逻辑
    switch (type) {
    case TYPE_FLY:
      if (isDead == false) {
        // 减速出现，加速返回
        speed -= 1;
        y += speed;
        if (y <= -200) {
          isDead = true;
        }
      }
      break;
    case TYPE_DUCKL:
      if (isDead == false) {
        // 斜右下角运动
        x += speed / 2;
        y += speed;
        if (x > MySurfaceView.screenW) {
          isDead = true;
        }
      }
      break;
    case TYPE_DUCKR:
      if (isDead == false) {
        // 斜左下角运动
        x -= speed / 2;
        y += speed;
        if (x < -50) {
          isDead = true;
        }
      }
      break;
    }
  }
}

在MySurfaceView 中 生成敌机

public class MySurfaceView extends SurfaceView implements Callback, Runnable {
  private SurfaceHolder sfh;
  private Paint paint;
  private Thread th;
  private boolean flag;
  private Canvas canvas;
  // 1 定义游戏状态常量
  public static final int GAME_MENU = 0;// 游戏菜单
  public static final int GAMEING = 1;// 游戏中
  public static final int GAME_WIN = 2;// 游戏胜利
  public static final int GAME_LOST = 3;// 游戏失败
  public static final int GAME_PAUSE = -1;// 游戏菜单
  // 当前游戏状态(默认初始在游戏菜单界面)
  public static int gameState = GAME_MENU;
  // 声明一个Resources实例便于加载图片
  private Resources res = this.getResources();
  // 声明游戏需要用到的图片资源(图片声明)
  private Bitmap bmpBackGround;// 游戏背景
  private Bitmap bmpBoom;// 爆炸效果
  private Bitmap bmpBoosBoom;// Boos爆炸效果
  private Bitmap bmpButton;// 游戏开始按钮
  private Bitmap bmpButtonPress;// 游戏开始按钮被点击
  private Bitmap bmpEnemyDuck;// 怪物鸭子
  private Bitmap bmpEnemyFly;// 怪物苍蝇
  private Bitmap bmpEnemyBoos;// 怪物猪头Boos
  private Bitmap bmpGameWin;// 游戏胜利背景
  private Bitmap bmpGameLost;// 游戏失败背景
  private Bitmap bmpPlayer;// 游戏主角飞机
  private Bitmap bmpPlayerHp;// 主角飞机血量
  private Bitmap bmpMenu;// 菜单背景
  public static Bitmap bmpBullet;// 子弹
  public static Bitmap bmpEnemyBullet;// 敌机子弹
  public static Bitmap bmpBossBullet;// Boss子弹
  public static int screenW;
  public static int screenH;
  // 声明一个敌机容器
  private Vector<Enemy> vcEnemy;
  // 每次生成敌机的时间(毫秒)
  private int createEnemyTime = 50;
  private int count;// 计数器
  // 敌人数组：1和2表示敌机的种类，-1表示Boss
  // 二维数组的每一维都是一组怪物
  private int enemyArray[][] = { { 1, 2 }, { 1, 1 }, { 1, 3, 1, 2 },
      { 1, 2 }, { 2, 3 }, { 3, 1, 3 }, { 2, 2 }, { 1, 2 }, { 2, 2 },
      { 1, 3, 1, 1 }, { 2, 1 }, { 1, 3 }, { 2, 1 }, { -1 } };
  // 当前取出一维数组的下标
  private int enemyArrayIndex;
  // 是否出现Boss标识位
  private boolean isBoss;
  // 随机库，为创建的敌机赋予随即坐标
  private Random random;
  //
  private GameMenu gameMenu;
  private GameBg gameBg;
  private Player player;
  
  public MySurfaceView(Context context) {
    super(context);
    sfh = this.getHolder();
    sfh.addCallback(this);
    paint = new Paint();
    paint.setColor(Color.WHITE);
    paint.setAntiAlias(true);
    setFocusable(true);
  }
  
  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    screenW = this.getWidth();
    screenH = this.getHeight();
    initGame();
    flag = true;
    // 实例线程
    th = new Thread(this);
    // 启动线程
    th.start();
  }
  
  private void initGame() {
    // 加载游戏资源
    bmpBackGround = BitmapFactory
        .decodeResource(res, R.drawable.background);
    bmpBoom = BitmapFactory.decodeResource(res, R.drawable.boom);
    bmpBoosBoom = BitmapFactory.decodeResource(res, R.drawable.boos_boom);
    bmpButton = BitmapFactory.decodeResource(res, R.drawable.button);
    bmpButtonPress = BitmapFactory.decodeResource(res,
        R.drawable.button_press);
    bmpEnemyDuck = BitmapFactory.decodeResource(res, R.drawable.enemy_duck);
    bmpEnemyFly = BitmapFactory.decodeResource(res, R.drawable.enemy_fly);
    bmpEnemyBoos = BitmapFactory.decodeResource(res, R.drawable.enemy_pig);
    bmpGameWin = BitmapFactory.decodeResource(res, R.drawable.gamewin);
    bmpGameLost = BitmapFactory.decodeResource(res, R.drawable.gamelost);
    bmpPlayer = BitmapFactory.decodeResource(res, R.drawable.player);
    bmpPlayerHp = BitmapFactory.decodeResource(res, R.drawable.hp);
    bmpMenu = BitmapFactory.decodeResource(res, R.drawable.menu);
    bmpBullet = BitmapFactory.decodeResource(res, R.drawable.bullet);
    bmpEnemyBullet = BitmapFactory.decodeResource(res,
        R.drawable.bullet_enemy);
    bmpBossBullet = BitmapFactory
        .decodeResource(res, R.drawable.boosbullet);
    // 菜单类实例化
    gameMenu = new GameMenu(bmpMenu, bmpButton, bmpButtonPress);
    // 实例游戏背景
    gameBg = new GameBg(bmpBackGround);
    // 实例主角
    player = new Player(bmpPlayer, bmpPlayerHp);
    // 实例敌机容器
    vcEnemy = new Vector<Enemy>();
    // 实例随机库
    random = new Random();
  }
  
  public void myDraw() {
    try {
      canvas = sfh.lockCanvas();
      if (canvas != null) {
        canvas.drawColor(Color.WHITE);
        // 绘图函数根据游戏状态不同进行不同绘制
        switch (gameState) {
        case GAME_MENU:
          gameMenu.draw(canvas, paint);
          break;
        case GAMEING:
          gameBg.draw(canvas, paint);
          player.draw(canvas, paint);
          if (isBoss == false) {
            // 敌机绘制
            for (int i = 0; i < vcEnemy.size(); i++) {
              vcEnemy.elementAt(i).draw(canvas, paint);
            }
          } else {
            // boss 绘制
          }
          break;
        case GAME_WIN:
          break;
        case GAME_LOST:
          break;
        case GAME_PAUSE:
          break;
        default:
          break;
        }
      }
    } catch (Exception e) {
      // TODO: handle exception
    } finally {
      if (canvas != null)
        sfh.unlockCanvasAndPost(canvas);
    }
  }
  
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    switch (gameState) {
    case GAME_MENU:
      gameMenu.onTouchEvent(event);
      break;
    case GAMEING:
      break;
    case GAME_WIN:
      break;
    case GAME_LOST:
      break;
    case GAME_PAUSE:
      break;
    }
    return true;
  }
  
  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (gameState) {
    case GAME_MENU:
      break;
    case GAMEING:
      player.onKeyDown(keyCode, event);
      break;
    case GAME_WIN:
      break;
    case GAME_LOST:
      break;
    case GAME_PAUSE:
      break;
    }
    return super.onKeyDown(keyCode, event);
  }
  @Override
  public boolean onKeyUp(int keyCode, KeyEvent event) {
    switch (gameState) {
    case GAME_MENU:
      break;
    case GAMEING:
      player.onKeyUp(keyCode, event);
      break;
    case GAME_WIN:
      break;
    case GAME_LOST:
      break;
    case GAME_PAUSE:
      break;
    }
    return super.onKeyUp(keyCode, event);
  }
  
  private void logic() {
    switch (gameState) {
    case GAME_MENU:
      break;
    case GAMEING:
      gameBg.logic();
      player.logic();
      // 敌机逻辑
      if (isBoss == false) {
        // 敌机逻辑
        for (int i = 0; i < vcEnemy.size(); i++) {
          Enemy en = vcEnemy.elementAt(i);
          // 因为容器不断添加敌机 ，那么对敌机isDead判定，
          // 如果已死亡那么就从容器中删除,对容器起到了优化作用；
          if (en.isDead) {
            vcEnemy.removeElementAt(i);
          } else {
            en.logic();
          }
        }
        // 生成敌机
        count++;
        if (count % createEnemyTime == 0) {
          for (int i = 0; i < enemyArray[enemyArrayIndex].length; i++) {
            // 苍蝇
            if (enemyArray[enemyArrayIndex][i] == 1) {
              int x = random.nextInt(screenW - 100) + 50;
              vcEnemy.addElement(new Enemy(bmpEnemyFly, 1, x, -50));
              // 鸭子左
            } else if (enemyArray[enemyArrayIndex][i] == 2) {
              int y = random.nextInt(20);
              vcEnemy.addElement(new Enemy(bmpEnemyDuck, 2, -50,
                  y));
              // 鸭子右
            } else if (enemyArray[enemyArrayIndex][i] == 3) {
              int y = random.nextInt(20);
              vcEnemy.addElement(new Enemy(bmpEnemyDuck, 3,
                  screenW + 50, y));
            }
          }
          // 这里判断下一组是否为最后一组(Boss)
          if (enemyArrayIndex == enemyArray.length - 1) {
            isBoss = true;
          } else {
            enemyArrayIndex++;
          }
        }
      }
      break;
    case GAME_WIN:
      break;
    case GAME_LOST:
      break;
    case GAME_PAUSE:
      break;
    }
  }
  @Override
  public void run() {
    while (flag) {
      long start = System.currentTimeMillis();
      myDraw();
      logic();
      long end = System.currentTimeMillis();
      try {
        if (end - start < 50) {
          Thread.sleep(50 - (end - start));
        }
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
  
  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
      int height) {
  }
  
  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    flag = false;
  }
}

碰撞检测
修改Player类

package com.gsf;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.KeyEvent;
public class Player {
  private int playerHp = 3;
  private Bitmap bmpPlayerHP;
  // 主角坐标以及位图
  private int x, y;
  private Bitmap bmpPlayer;
  // 主角移动速度
  private int speed = 5;
  // 主角移动标识
  private boolean isUp, isDown, isLeft, isRight;
  // 主角的构造函数
  public Player(Bitmap bmpPlayer, Bitmap bmpPlayerHp) {
    this.bmpPlayer = bmpPlayer;
    this.bmpPlayerHP = bmpPlayerHp;
    // 飞机初始位置
    x = MySurfaceView.screenW / 2 - bmpPlayer.getWidth() / 2;
    y = MySurfaceView.screenH - bmpPlayer.getHeight();
  }
  // 主角游戏绘制方法
  public void draw(Canvas canvas, Paint paint) {
    // 绘制主角
    canvas.drawBitmap(bmpPlayer, x, y, paint);
    // 绘制血量
    for (int i = 0; i < playerHp; i++) {
      canvas.drawBitmap(bmpPlayerHP, i * bmpPlayerHP.getWidth(),
          MySurfaceView.screenH - bmpPlayerHP.getHeight(), paint);
    }
  }
  
  public void onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
      isUp = true;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
      isDown = true;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
      isLeft = true;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
      isRight = true;
    }
  }
  public void onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
      isUp = false;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
      isDown = false;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
      isLeft = false;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
      isRight = false;
    }
  }
  
  public void logic() {
    if (isUp) {
      y -= speed;
    }
    if (isDown) {
      y += speed;
    }
    if (isLeft) {
      x -= speed;
    }
    if (isRight) {
      x += speed;
    }
    // 判断屏幕X边界
    if (x + bmpPlayer.getWidth() >= MySurfaceView.screenW) {
      x = MySurfaceView.screenW - bmpPlayer.getWidth();
    } else if (x <= 0) {
      x = 0;
    }
    // 判断屏幕Y边界
    if (y + bmpPlayer.getHeight() >= MySurfaceView.screenH) {
      y = MySurfaceView.screenH - bmpPlayer.getHeight();
    } else if (y <= 0) {
      y = 0;
    }
  }
  //设置主角血量
  public void setPlayerHp(int hp) {
    this.playerHp = hp;
  }
  //获取主角血量
  public int getPlayerHp() {
    return playerHp;
  }
  //判断碰撞(敌机与主角子弹碰撞)
  public boolean isCollsionWith(Enemy bullet) {
      int x2 = bullet.x;
      int y2 = bullet.y;
      int w2 = bullet.frameW;
      int h2 = bullet.frameH;
      if (x >= x2 && x >= x2 + w2) {
        return false;
      } else if (x <= x2 && x + bmpPlayer.getWidth() <= x2) {
        return false;
      } else if (y >= y2 && y >= y2 + h2) {
        return false;
      } else if (y <= y2 && y + bmpPlayer.getHeight() <= y2) {
        return false;
      }
      //发生碰撞，让其死亡
      //isDead = true;
      return true;
    }
}

在MySurface中 加上碰撞逻辑

  
  private void logic() {
    switch (gameState) {
    case GAME_MENU:
      break;
    case GAMEING:
      gameBg.logic();
      player.logic();
      // 敌机逻辑
      if (isBoss == false) {
        // 敌机逻辑
        for (int i = 0; i < vcEnemy.size(); i++) {
          Enemy en = vcEnemy.elementAt(i);
          // 因为容器不断添加敌机 ，那么对敌机isDead判定，
          // 如果已死亡那么就从容器中删除,对容器起到了优化作用；
          if (en.isDead) {
            vcEnemy.removeElementAt(i);
          } else {
            en.logic();
          }
        }
        // 生成敌机
        count++;
        if (count % createEnemyTime == 0) {
          for (int i = 0; i < enemyArray[enemyArrayIndex].length; i++) {
            // 苍蝇
            if (enemyArray[enemyArrayIndex][i] == 1) {
              int x = random.nextInt(screenW - 100) + 50;
              vcEnemy.addElement(new Enemy(bmpEnemyFly, 1, x, -50));
              // 鸭子左
            } else if (enemyArray[enemyArrayIndex][i] == 2) {
              int y = random.nextInt(20);
              vcEnemy.addElement(new Enemy(bmpEnemyDuck, 2, -50,
                  y));
              // 鸭子右
            } else if (enemyArray[enemyArrayIndex][i] == 3) {
              int y = random.nextInt(20);
              vcEnemy.addElement(new Enemy(bmpEnemyDuck, 3,
                  screenW + 50, y));
            }
          }
          // 这里判断下一组是否为最后一组(Boss)
          if (enemyArrayIndex == enemyArray.length - 1) {
            isBoss = true;
          } else {
            enemyArrayIndex++;
          }
        }
        //处理敌机与主角的碰撞
        for (int i = 0; i < vcEnemy.size(); i++) {
          if (player.isCollsionWith(vcEnemy.elementAt(i))) {
            //发生碰撞，主角血量-1
            player.setPlayerHp(player.getPlayerHp() - 1);
            //当主角血量小于0，判定游戏失败
            if (player.getPlayerHp() <= -1) {
              gameState = GAME_LOST;
            }
          }
        }
      }
      break;

// 计时器
  private int noCollisionCount = 0;
  // 因为无敌时间
  private int noCollisionTime = 60;
  // 是否碰撞的标识位
  private boolean isCollision;
//判断碰撞(主角与敌机)
  public boolean isCollsionWith(Enemy en) {
    //是否处于无敌时间
    if (isCollision == false) {
      int x2 = en.x;
      int y2 = en.y;
      int w2 = en.frameW;
      int h2 = en.frameH;
      if (x >= x2 && x >= x2 + w2) {
        return false;
      } else if (x <= x2 && x + bmpPlayer.getWidth() <= x2) {
        return false;
      } else if (y >= y2 && y >= y2 + h2) {
        return false;
      } else if (y <= y2 && y + bmpPlayer.getHeight() <= y2) {
        return false;
      }
      //碰撞即进入无敌状态
      isCollision = true;
      return true;
      //处于无敌状态，无视碰撞
    } else {
      return false;
    }
  }

修改逻辑方法

  
  public void logic() {
    if (isUp) {
      y -= speed;
    }
    if (isDown) {
      y += speed;
    }
    if (isLeft) {
      x -= speed;
    }
    if (isRight) {
      x += speed;
    }
    // 判断屏幕X边界
    if (x + bmpPlayer.getWidth() >= MySurfaceView.screenW) {
      x = MySurfaceView.screenW - bmpPlayer.getWidth();
    } else if (x <= 0) {
      x = 0;
    }
    // 判断屏幕Y边界
    if (y + bmpPlayer.getHeight() >= MySurfaceView.screenH) {
      y = MySurfaceView.screenH - bmpPlayer.getHeight();
    } else if (y <= 0) {
      y = 0;
    }
    // 处理无敌状态
    if (isCollision) {
      // 计时器开始计时
      noCollisionCount++;
      if (noCollisionCount >= noCollisionTime) {
        // 无敌时间过后，接触无敌状态及初始化计数器
        isCollision = false;
        noCollisionCount = 0;
      }
    }
  }

修改主角的绘制
Player 类

// 主角游戏绘制方法
  public void draw(Canvas canvas, Paint paint) {
    // 绘制主角
    // 当处于无敌时间时，让主角闪烁
    if (isCollision) {
      // 每2次游戏循环，绘制一次主角
      if (noCollisionCount % 2 == 0) {
        canvas.drawBitmap(bmpPlayer, x, y, paint);
      }
    } else {
      canvas.drawBitmap(bmpPlayer, x, y, paint);
    }
    // 绘制血量
    for (int i = 0; i < playerHp; i++) {
      canvas.drawBitmap(bmpPlayerHP, i * bmpPlayerHP.getWidth(),
          MySurfaceView.screenH - bmpPlayerHP.getHeight(), paint);
    }
  }

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