/** Gets the rotation in radians */
public float getRotation() {
if (mDetector.getCount() < 2) {
return 0;
} else {
float startDeltaX = mDetector.getStartX()[1] - mDetector.getStartX()[0];
float startDeltaY = mDetector.getStartY()[1] - mDetector.getStartY()[0];
float currentDeltaX = mDetector.getCurrentX()[1] - mDetector.getCurrentX()[0];
float currentDeltaY = mDetector.getCurrentY()[1] - mDetector.getCurrentY()[0];
float startAngle = (float) Math.atan2(startDeltaY, startDeltaX);
float currentAngle = (float) Math.atan2(currentDeltaY, currentDeltaX);
return currentAngle - startAngle;
}
}
/** Gets the scale */
public float getScale() {
if (mDetector.getCount() < 2) {
return 1;
} else {
float startDeltaX = mDetector.getStartX()[1] - mDetector.getStartX()[0];
float startDeltaY = mDetector.getStartY()[1] - mDetector.getStartY()[0];
float currentDeltaX = mDetector.getCurrentX()[1] - mDetector.getCurrentX()[0];
float currentDeltaY = mDetector.getCurrentY()[1] - mDetector.getCurrentY()[0];
float startDist = (float) Math.hypot(startDeltaX, startDeltaY);
float currentDist = (float) Math.hypot(currentDeltaX, currentDeltaY);
return currentDist / startDist;
}
}
/**
* Handles the given motion event.
*
* @param event event to handle
* @return whether or not the event was handled
*/
public boolean onTouchEvent(final MotionEvent event) {
return mDetector.onTouchEvent(event);
}
/** Resets the component to the initial state. */
public void reset() {
mDetector.reset();
}
/** Factory method that creates a new instance of TransformGestureDetector */
public static TransformGestureDetector newInstance() {
return new TransformGestureDetector(MultiPointerGestureDetector.newInstance());
}
public TransformGestureDetector(MultiPointerGestureDetector multiPointerGestureDetector) {
mDetector = multiPointerGestureDetector;
mDetector.setListener(this);
}
/** Gets the Y component of the translation */
public float getTranslationY() {
return calcAverage(mDetector.getCurrentY(), mDetector.getCount())
- calcAverage(mDetector.getStartY(), mDetector.getCount());
}
/** Gets the Y coordinate of the pivot point */
public float getPivotY() {
return calcAverage(mDetector.getStartY(), mDetector.getCount());
}
/** Gets whether gesture is in progress or not */
public boolean isGestureInProgress() {
return mDetector.isGestureInProgress();
}
/** Restarts the current gesture */
public void restartGesture() {
mDetector.restartGesture();
}
