code: public float getImageRotation() {
  		double d = 2.0 * Math.PI;
  		float rot = (float) ((rotationRadians - initialRotation) % d);
  		if (rot < 0) {
  			rot += d;
  		}
          return rot;
      }
docs: Gets the current image rotation in radians.
  @return the current image rotation in radians