docs: public void setDirectionArrow(final Bitmap personBitmap, final Bitmap directionArrowBitmap){
  		this.mPersonBitmap = personBitmap;
  		this.mDirectionArrowBitmap=directionArrowBitmap;
  
  
  		mDirectionArrowCenterX = mDirectionArrowBitmap.getWidth() / 2.0f - 0.5f;
  		mDirectionArrowCenterY = mDirectionArrowBitmap.getHeight() / 2.0f - 0.5f;
  
  	}