public void setStartState(float[] boundPoints, Matrix imageMatrix) {
    reset();
    System.arraycopy(boundPoints, 0, mStartBoundPoints, 0, 8);
    mStartCropWindowRect.set(mCropOverlayView.getCropWindowRect());
    imageMatrix.getValues(mStartImageMatrix);
  }
Animation to handle smooth cropping image matrix transformation change, specifically for
zoom-in/out.
core/src/main/java/com/theartofdev/edmodo/cropper/CropImageAnimation.java