Android遊戲開發之碰撞檢測（矩形碰撞、圓形碰撞、像素碰撞）_Android

本文為大家分享了Android遊戲開發之碰撞檢測，供大家參考，具體內容如下

矩形碰撞 原理: 兩個矩形位置 的四種情況 不是這四中情況 則碰撞

圓形碰撞 原理: 利用兩個圓心之間的距離進行判定.當兩個圓心的距離小於半徑之和則碰撞.

像素碰撞 原理:不適用 遍曆所有像素 檢測 太多了

多矩形碰撞 原理:設定多個矩形碰撞檢測地區 檢測碰撞矩形數組 與另一碰撞矩形數組之間的位置關係.

矩形碰撞 代碼:

public class MySurfaceView extends SurfaceView implements Callback, Runnable {  private SurfaceHolder sfh;  private Paint paint;  private Thread th;  private boolean flag;  private Canvas canvas;  private int screenW, screenH;  //定義兩個矩形的寬高座標  private int x1 = 10, y1 = 110, w1 = 40, h1 = 40;  private int x2 = 100, y2 = 110, w2 = 40, h2 = 40;  //便於觀察是否發生了碰撞設定一個標識位  private boolean isCollsion;  /**   * SurfaceView初始化函數   */  public MySurfaceView(Context context) {    super(context);    sfh = this.getHolder();    sfh.addCallback(this);    paint = new Paint();    paint.setColor(Color.WHITE);    paint.setAntiAlias(true);    setFocusable(true);  }  /**   * SurfaceView視圖建立，響應此函數   */  @Override  public void surfaceCreated(SurfaceHolder holder) {    screenW = this.getWidth();    screenH = this.getHeight();    flag = true;    //執行個體線程    th = new Thread(this);    //啟動線程    th.start();  }  /**   * 遊戲繪圖   */  public void myDraw() {    try {      canvas = sfh.lockCanvas();      if (canvas != null) {        canvas.drawColor(Color.BLACK);        if (isCollsion) {          paint.setColor(Color.RED);          paint.setTextSize(20);          canvas.drawText("Collision！", 0, 30, paint);        } else {          paint.setColor(Color.WHITE);        }        //繪製兩個矩形        canvas.drawRect(x1, y1, x1 + w1, y1 + h1, paint);        canvas.drawRect(x2, y2, x2 + w2, y2 + h2, paint);      }    } catch (Exception e) {      // TODO: handle exception    } finally {      if (canvas != null)        sfh.unlockCanvasAndPost(canvas);    }  }  /**   * 觸屏事件監聽   */  @Override  public boolean onTouchEvent(MotionEvent event) {    //讓矩形1隨著觸屏位置移動    x1 = (int) event.getX() - w1 / 2;    y1 = (int) event.getY() - h1 / 2;    if (isCollsionWithRect(x1, y1, w1, h1, x2, y2, w2, h2)) {      isCollsion = true;    } else {      isCollsion = false;    }    return true;  }  /**   * 按鍵事件監聽   */  @Override  public boolean onKeyDown(int keyCode, KeyEvent event) {    return super.onKeyDown(keyCode, event);  }  /**   * 遊戲邏輯   */  private void logic() {  }  public boolean isCollsionWithRect(int x1, int y1, int w1, int h1, int x2, int y2, int w2, int h2) {    if (x1 >= x2 && x1 >= x2 + w2) {      return false;    } else if (x1 <= x2 && x1 + w1 <= x2) {      return false;    } else if (y1 >= y2 && y1 >= y2 + h2) {      return false;    } else if (y1 <= y2 && y1 + h1 <= y2) {      return false;    }    return true;  }  @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();      }    }  }  /**   * SurfaceView檢視狀態發生改變，響應此函數   */  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {  }  /**   * SurfaceView視圖消亡時，響應此函數   */  @Override  public void surfaceDestroyed(SurfaceHolder holder) {    flag = false;  }}

圓形碰撞 代碼:

public class MySurfaceView extends SurfaceView implements Callback, Runnable {  private SurfaceHolder sfh;  private Paint paint;  private Thread th;  private boolean flag;  private Canvas canvas;  private int screenW, screenH;  //定義兩個圓形的半徑與座標  private int r1 = 20, r2 = 20;  private int x1 = 50, y1 = 100, x2 = 150, y2 = 100;  //定義一個碰撞標識位  private boolean isCollision;  /**   * SurfaceView初始化函數   */  public MySurfaceView(Context context) {    super(context);    sfh = this.getHolder();    sfh.addCallback(this);    paint = new Paint();    paint.setColor(Color.WHITE);    paint.setAntiAlias(true);    setFocusable(true);  }  /**   * SurfaceView視圖建立，響應此函數   */  @Override  public void surfaceCreated(SurfaceHolder holder) {    screenW = this.getWidth();    screenH = this.getHeight();    flag = true;    //執行個體線程    th = new Thread(this);    //啟動線程    th.start();  }  /**   * 遊戲繪圖   */  public void myDraw() {    try {      canvas = sfh.lockCanvas();      if (canvas != null) {        canvas.drawColor(Color.BLACK);        if (isCollision) {          paint.setColor(Color.RED);          paint.setTextSize(20);          canvas.drawText("Collision!", 0, 30, paint);        } else {          paint.setColor(Color.WHITE);        }        canvas.drawCircle(x1, y1, r1, paint);        canvas.drawCircle(x2, y2, r2, paint);      }    } catch (Exception e) {      // TODO: handle exception    } finally {      if (canvas != null)        sfh.unlockCanvasAndPost(canvas);    }  }  /**   * 觸屏事件監聽   */  @Override  public boolean onTouchEvent(MotionEvent event) {    x1 = (int) event.getX();    y1 = (int) event.getY();    if (isCollisionWithCircle(x1, y1, x2, y2, r1, r2)) {      isCollision = true;    } else {      isCollision = false;    }    return true;  }  /**   * 圓形碰撞   * @param x1  圓形1的圓心X座標   * @param y1  圓形2的圓心X座標   * @param x2  圓形1的圓心Y座標   * @param y2  圓形2的圓心Y座標   * @param r1  圓形1的半徑   * @param r2  圓形2的半徑   * @return   */  private boolean isCollisionWithCircle(int x1, int y1, int x2, int y2, int r1, int r2) {    //Math.sqrt:開平方    //Math.pow(double x, double y): X的Y次方    if (Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2)) <= r1 + r2) {      //如果兩圓的圓心距小於或等於兩圓半徑則認為發生碰撞      return true;    }    return false;  }  /**   * 按鍵事件監聽   */  @Override  public boolean onKeyDown(int keyCode, KeyEvent event) {    return super.onKeyDown(keyCode, event);  }  /**   * 遊戲邏輯   */  private void logic() {  }  @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();      }    }  }  /**   * SurfaceView檢視狀態發生改變，響應此函數   */  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {  }  /**   * SurfaceView視圖消亡時，響應此函數   */  @Override  public void surfaceDestroyed(SurfaceHolder holder) {    flag = false;  }}

多矩形碰撞 代碼

public class MySurfaceView extends SurfaceView implements Callback, Runnable {  private SurfaceHolder sfh;  private Paint paint;  private Thread th;  private boolean flag;  private Canvas canvas;  private int screenW, screenH;  //定義兩個矩形圖形的寬高座標  private int rectX1 = 10, rectY1 = 10, rectW1 = 40, rectH1 = 40;  private int rectX2 = 100, rectY2 = 110, rectW2 = 40, rectH2 = 40;  //便於觀察是否發生了碰撞設定一個標識位  private boolean isCollsion;  //定義第一個矩形的矩形碰撞數組  private Rect clipRect1 = new Rect(0, 0, 15, 15);  private Rect clipRect2 = new Rect(rectW1 - 15, rectH1 - 15, rectW1, rectH1);  private Rect[] arrayRect1 = new Rect[] { clipRect1, clipRect2 };  //定義第二個矩形的矩形碰撞數組  private Rect clipRect3 = new Rect(0, 0, 15, 15);  private Rect clipRect4 = new Rect(rectW2 - 15, rectH2 - 15, rectW2, rectH2);  private Rect[] arrayRect2 = new Rect[] { clipRect3, clipRect4 };  /**   * SurfaceView初始化函數   */  public MySurfaceView(Context context) {    super(context);    sfh = this.getHolder();    sfh.addCallback(this);    paint = new Paint();    paint.setColor(Color.WHITE);    paint.setAntiAlias(true);    setFocusable(true);  }  /**   * SurfaceView視圖建立，響應此函數   */  @Override  public void surfaceCreated(SurfaceHolder holder) {    screenW = this.getWidth();    screenH = this.getHeight();    flag = true;    //執行個體線程    th = new Thread(this);    //啟動線程    th.start();  }  /**   * 遊戲繪圖   */  public void myDraw() {    try {      canvas = sfh.lockCanvas();      if (canvas != null) {        canvas.drawColor(Color.BLACK);        paint.setColor(Color.WHITE);        paint.setStyle(Style.FILL);        if (isCollsion) {          paint.setTextSize(20);          canvas.drawText("Collision！", 0, 30, paint);        }        //繪製兩個矩形        canvas.drawRect(rectX1, rectY1, rectX1 + rectW1, rectY1 + rectH1, paint);        canvas.drawRect(rectX2, rectY2, rectX2 + rectW2, rectY2 + rectH2, paint);        //---繪製碰撞地區使用非填充，並設定畫筆顏色白色        paint.setStyle(Style.STROKE);        paint.setColor(Color.RED);        //繪製第一個矩形的所有矩形碰撞地區        for (int i = 0; i < arrayRect1.length; i++) {          canvas.drawRect(arrayRect1[i].left + this.rectX1, arrayRect1[i].top + this.rectY1, arrayRect1[i].right + this.rectX1, arrayRect1[i].bottom              + this.rectY1, paint);        }        //繪製第二個矩形的所有矩形碰撞地區        for (int i = 0; i < arrayRect2.length; i++) {          canvas.drawRect(arrayRect2[i].left + this.rectX2, arrayRect2[i].top + this.rectY2, arrayRect2[i].right + this.rectX2, arrayRect2[i].bottom              + rectY2, paint);        }      }    } catch (Exception e) {      // TODO: handle exception    } finally {      if (canvas != null)        sfh.unlockCanvasAndPost(canvas);    }  }  /**   * 觸屏事件監聽   */  @Override  public boolean onTouchEvent(MotionEvent event) {    //讓矩形1隨著觸屏位置移動    rectX1 = (int) event.getX() - rectW1 / 2;    rectY1 = (int) event.getY() - rectH1 / 2;    if (isCollsionWithRect(arrayRect1, arrayRect2)) {      isCollsion = true;    } else {      isCollsion = false;    }    return true;  }  /**   * 按鍵事件監聽   */  @Override  public boolean onKeyDown(int keyCode, KeyEvent event) {    return super.onKeyDown(keyCode, event);  }  /**   * 遊戲邏輯   */  private void logic() {  }  //Rect 類中的四個屬性 top bottom left right  //分別表示這個矩形的     上    下      左     右  public boolean isCollsionWithRect(Rect[] rectArray, Rect[] rect2Array) {    Rect rect = null;    Rect rect2 = null;    for (int i = 0; i < rectArray.length; i++) {      //依次取出第一個矩形數組的每個矩形執行個體      rect = rectArray[i];      //擷取到第一個矩形數組中每個矩形元素的屬性值      int x1 = rect.left + this.rectX1;      int y1 = rect.top + this.rectY1;      int w1 = rect.right - rect.left;      int h1 = rect.bottom - rect.top;      for (int j = 0; j < rect2Array.length; j++) {        //依次取出第二個矩形數組的每個矩形執行個體        rect2 = rect2Array[j];        //擷取到第二個矩形數組中每個矩形元素的屬性值        int x2 = rect2.left + this.rectX2;        int y2 = rect2.top + this.rectY2;        int w2 = rect2.right - rect2.left;        int h2 = rect2.bottom - rect2.top;        //進行迴圈遍曆兩個矩形碰撞數組所有元素之間的位置關係        if (x1 >= x2 && x1 >= x2 + w2) {        } else if (x1 <= x2 && x1 + w1 <= x2) {        } else if (y1 >= y2 && y1 >= y2 + h2) {        } else if (y1 <= y2 && y1 + h1 <= y2) {        } else {          //只要有一個碰撞矩形數組與另一碰撞矩形數組發生碰撞則認為碰撞          return true;        }      }    }    return false;  }  @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();      }    }  }  /**   * SurfaceView檢視狀態發生改變，響應此函數   */  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {  }  /**   * SurfaceView視圖消亡時，響應此函數   */  @Override  public void surfaceDestroyed(SurfaceHolder holder) {    flag = false;  }}

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