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- imageView.setOnTouchListener(new onClick());
- class onClick implements View.OnTouchListener {
- // these matrices will be used to move and zoom image
- private Matrix matrix = new Matrix();
- private Matrix savedMatrix = new Matrix();
- // we can be in one of these 3 states
- private static final int NONE = 0;
- private static final int DRAG = 1;
- private static final int ZOOM = 2;
- private int mode = NONE;
- // remember some things for zooming
- private PointF start = new PointF();
- private PointF mid = new PointF();
- private float oldDist = 1f;
- private float d = 0f;
- private float newRot = 0f;
- private float[] lastEvent = null;
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- // handle touch events here
- ImageView view = (ImageView) v;
- switch (event.getAction() & MotionEvent.ACTION_MASK) {
- case MotionEvent.ACTION_DOWN:
- savedMatrix.set(matrix);
- start.set(event.getX(), event.getY());
- mode = DRAG;
- lastEvent = null;
- break;
- case MotionEvent.ACTION_POINTER_DOWN:
- oldDist = spacing(event);
- if (oldDist > 10f) {
- savedMatrix.set(matrix);
- midPoint(mid, event);
- 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;
- break;
- case MotionEvent.ACTION_MOVE:
- if (mode == DRAG) {
- matrix.set(savedMatrix);
- float dx = event.getX() - start.x;
- float dy = event.getY() - start.y;
- matrix.postTranslate(dx, dy);
- } else if (mode == ZOOM) {
- float newDist = spacing(event);
- if (newDist > 10f) {
- matrix.set(savedMatrix);
- float scale = (newDist / oldDist);
- matrix.postScale(scale, scale, mid.x, mid.y);
- }
- if (lastEvent != null && event.getPointerCount() == 3) {
- newRot = rotation(event);
- float r = newRot - d;
- float[] values = new float[9];
- matrix.getValues(values);
- float tx = values[2];
- float ty = values[5];
- float sx = values[0];
- float xc = (view.getWidth() / 2) * sx;
- float yc = (view.getHeight() / 2) * sx;
- matrix.postRotate(r, tx + xc, ty + yc);
- }
- }
- break;
- }
- view.setImageMatrix(matrix);
- return true;
- }
- private float spacing(MotionEvent event) {
- float x = event.getX(0) - event.getX(1);
- float y = event.getY(0) - event.getY(1);
- return (float)Math.sqrt(x * x + y * y);
- }
- /**
- * Calculate the mid point of the first two fingers
- */
- private void midPoint(PointF point, MotionEvent event) {
- float x = event.getX(0) + event.getX(1);
- float y = event.getY(0) + event.getY(1);
- point.set(x / 2, y / 2);
- }
- /**
- * Calculate the degree to be rotated by.
- *
- * @param event
- * @return Degrees
- */
- 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);
- return (float) Math.toDegrees(radians);
- }
- }
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