public void setGuidelines(CropImageView.Guidelines guidelines) {
    if (mGuidelines != guidelines) {
      mGuidelines = guidelines;
      if (initializedCropWindow) {
        invalidate();
      }
    }
  }
Sets the guidelines for the CropOverlayView to be either on, off, or to show when resizing the
application.
core/src/main/java/com/theartofdev/edmodo/cropper/CropOverlayView.java