Вращение и масштабирование с помощью multi touch в android

Я хочу повернуть и масштабировать изображение при мультитач-событии, я могу перетащить, масштабировать изображение, но я не могу понять поворот изображения. Я столкнулся с проблемой, поэтому, пожалуйста, помогите мне как можно скорее. Мой код есть

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); } } 

Поэтому, пожалуйста, предоставьте мне точное решение этой проблемы.

Solutions Collecting From Web of "Вращение и масштабирование с помощью multi touch в android"

  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); } 

Попробуйте этот код, но помните, что у какого-то старого телефона есть проблема с вращением.