2011-12-15 11 views
8

マルチタッチイベントで画像を回転して拡大縮小したい ドラッグすることはできますが、画像を拡大縮小できますが、画像の回転を理解できません。 私は問題に直面しているので、できるだけ早く手伝ってください。 私のコードはありますアンドロイドでマルチタッチを使用した回転とスケーリング

public class Touch extends Activity implements OnTouchListener { 
     private static final String TAG = "Touch"; 
     // These matrices will be used to move and zoom image 
     Matrix matrix = new Matrix(); 
    Matrix matrix1 = new Matrix(); 
    Matrix savedMatrix = new Matrix(); 
    Matrix savedMatrix2 = new Matrix(); 
    // We can be in one of these 3 states 
    static final int NONE = 0; 
    static final int DRAG = 1; 
    static final int ZOOM = 2; 
    int mode = NONE; 
    float oldscale =0; 
    // Remember some things for zooming 
    PointF start = new PointF(); 
    PointF mid = new PointF(); 
    float oldDist = 1f; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     ImageView view = (ImageView) findViewById(R.id.imageView2); 
     view.setOnTouchListener(this); 

     ImageView view1 = (ImageView) findViewById(R.id.imageView2); 
     view1.setOnTouchListener(this); 

     // ... 
     // Work around a Cupcake bug 
     matrix.setTranslate(1f, 1f); 
     matrix1.setTranslate(1f, 1f); 
     view.setImageMatrix(matrix); 
     view1.setImageMatrix(matrix1); 
    } 

    @Override 
    public boolean onTouch(View v, MotionEvent rawEvent) { 
     WrapMotionEvent event = WrapMotionEvent.wrap(rawEvent); 
     // ... 
     ImageView view = (ImageView) v; 

     // Dump touch event to log 
     dumpEvent(event); 

     // Handle touch events here... 
     double r = Math.atan2(event.getX() - 400/2, 
      400/2 - event.getY()); 
     int rotation = (int) Math.toDegrees(r); 
     float newRot = new Float(rotation); 

     switch (event.getAction() & MotionEvent.ACTION_MASK) { 

     case MotionEvent.ACTION_DOWN: 
     savedMatrix.set(matrix); 
     start.set(event.getX(), event.getY()); 
     Log.d(TAG, "mode=DRAG"); 
     mode = DRAG; 
     break; 
     case MotionEvent.ACTION_POINTER_DOWN: 
     oldDist = spacing(event); 
     Log.d(TAG, "oldDist=" + oldDist); 
     if (oldDist > 10f) { 
      savedMatrix.set(matrix); 
      midPoint(mid, event); 
      mode = ZOOM; 
      Log.d(TAG, "mode=ZOOM"); 

     } 
     break; 
     case MotionEvent.ACTION_UP: 
     case MotionEvent.ACTION_POINTER_UP: 
     mode = NONE; 
     Log.d(TAG, "mode=NONE"); 
     break; 
     case MotionEvent.ACTION_MOVE: 
      matrix.postRotate(15); 
     if (mode == DRAG) { 
      // ... 
      matrix.set(savedMatrix); 
      matrix.postTranslate(event.getX() - start.x, 
        event.getY() - start.y); 
     } 
     else if (mode == ZOOM) { 
      float newDist = spacing(event); 
      Log.d(TAG, "newDist=" + newDist); 
      if (newDist > 10f) { 
       matrix.set(savedMatrix); 
       float scale = newDist/oldDist; 
       matrix.postScale(scale, scale, mid.x, mid.y); 
       Log.e("scale | mid.x | mid.y", scale + " " +mid.x + " " + mid.y); 

      } 
     } 
     break; 
     } 
     view.setImageMatrix(matrix); 
     return true; // indicate event was handled 
    } 

    /** Show an event in the LogCat view, for debugging */ 
    private void dumpEvent(WrapMotionEvent event) { 
     // ... 
     String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE", 
      "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" }; 
     StringBuilder sb = new StringBuilder(); 
     int action = event.getAction(); 
     int actionCode = action & MotionEvent.ACTION_MASK; 
     sb.append("event ACTION_").append(names[actionCode]); 
     if (actionCode == MotionEvent.ACTION_POINTER_DOWN 
      || actionCode == MotionEvent.ACTION_POINTER_UP) { 
     sb.append("(pid ").append(
       action >> MotionEvent.ACTION_POINTER_ID_SHIFT); 
     sb.append(")"); 
     } 
     sb.append("["); 
     for (int i = 0; i < event.getPointerCount(); i++) { 
     sb.append("#").append(i); 
     sb.append("(pid ").append(event.getPointerId(i)); 
     sb.append(")=").append((int) event.getX(i)); 
     sb.append(",").append((int) event.getY(i)); 
     if (i + 1 < event.getPointerCount()) 
      sb.append(";"); 
     } 
     sb.append("]"); 
     Log.d(TAG, sb.toString()); 
    } 

    /** Determine the space between the first two fingers */ 
    private float spacing(WrapMotionEvent event) { 
     // ... 
     float x = event.getX(0) - event.getX(1); 
     float y = event.getY(0) - event.getY(1); 
     return FloatMath.sqrt(x * x + y * y); 
    } 

    /** Calculate the mid point of the first two fingers */ 
    private void midPoint(PointF point, WrapMotionEvent event) { 
     // ... 
     float x = event.getX(0) + event.getX(1); 
     float y = event.getY(0) + event.getY(1); 
     point.set(x/2, y/2); 
    } 
} 

この問題の解決方法を教えてください。

答えて

10
float[] lastEvent = null; 
    float d = 0f; 
    float newRot = 0f; 
    @Override 
    public boolean onTouch(View v, MotionEvent event) { 
     ImageView view = (ImageView) v; 

     // Dump touch event to log 
     dumpEvent(event); 

     // Handle touch events here... 
     switch (event.getAction() & MotionEvent.ACTION_MASK) { 
     case MotionEvent.ACTION_DOWN: 
     savedMatrix.set(matrix); 
    start.set(event.getX(), event.getY()); 
    if (Constant.TRACE) Log.d(TAG, "mode=DRAG"); 
    mode = DRAG; 
    lastEvent = null; 
    break; 
    case MotionEvent.ACTION_POINTER_DOWN: 
    oldDist = spacing(event);   
    savedMatrix.set(matrix); 
    midPoint(mid, event); 
    mode = ZOOM; 
    if (Constant.TRACE) Log.d(TAG, "mode=ZOOM"); 

    lastEvent = new float[4]; 
    lastEvent[0] = event.getX(0); 
    lastEvent[1] = event.getX(1); 
    lastEvent[2] = event.getY(0); 
    lastEvent[3] = event.getY(1); 
    d = rotation(event); 
    break; 
    case MotionEvent.ACTION_UP: 
    case MotionEvent.ACTION_POINTER_UP: 
    mode = NONE; 
    lastEvent = null; 
    if (Constant.TRACE) Log.d(TAG, "mode=NONE");   
    break; 
    case MotionEvent.ACTION_MOVE: 
    if (mode == DRAG) { 
     // ... 
     matrix.set(savedMatrix); 
     matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); 
    } 
    else if (mode == ZOOM && event.getPointerCount()==2) { 
     float newDist = spacing(event); 
     if (Constant.TRACE) Log.d(TAG, "Count=" + event.getPointerCount()); 
     if (Constant.TRACE) Log.d(TAG, "newDist=" + newDist); 
     matrix.set(savedMatrix); 
     if (newDist > 10f) {    
      float scale = newDist/oldDist; 
      matrix.postScale(scale, scale, mid.x, mid.y); 
     } 
     if (lastEvent!=null){ 
      newRot = rotation(event); 
      if (Constant.TRACE) Log.d("Degreeeeeeeeeee", "newRot="+(newRot)); 
      float r = newRot-d; 
      matrix.postRotate(r, imgView.getMeasuredWidth()/2, imgView.getMeasuredHeight()/2); 
     } 
    } 
    break; 
    } 

    view.setImageMatrix(matrix); 
    return true; // indicate event was handled 

}

/** Determine the degree between the first two fingers */ 
    private float rotation(MotionEvent event) { 
     double delta_x = (event.getX(0) - event.getX(1)); 
     double delta_y = (event.getY(0) - event.getY(1)); 
     double radians = Math.atan2(delta_y, delta_x);  
     if (Constant.TRACE) Log.d("Rotation ~~~~~~~~~~~~~~~~~", delta_x+" ## "+delta_y+" ## "+radians+" ## " 
         +Math.toDegrees(radians)); 
     return (float) Math.toDegrees(radians); 
    } 

+0

素晴らしい..回転に問題があり、このコードを試してみて、いくつかの古い携帯電話を覚えています。わたしにはできる。 – Santhosh

+1

私はこのコードを試してみましたが、イメージはそれ自身の軸を中心に回転していません。中心点を中心に回転する必要がありますが、スケーリングのために相対座標を見つけるのが間違った位置に表示されます。 – strike

+0

@strike、あなたはイメージの現在の翻訳を保存し、中心点を計算することができます。スケーリングについて忘れないでください。 – someUser

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