docs: public void configure( int width , int height , int gridRows , int gridCols ) {
  
  		// need to maintain the same ratio of pixels in the grid as in the regular image for similarity and rigid
  		// to work correctly
  		int s = Math.max(width,height);
  		scaleX = s/(float)(gridCols-1);
  		scaleY = s/(float)(gridRows-1);
  		if( gridRows > gridCols ) {
  			scaleY /= (gridCols-1)/ (float) (gridRows-1);
  		} else {
  			scaleX /= (gridRows-1)/ (float) (gridCols-1);
  		}
  
  		this.gridRows = gridRows;
  		this.gridCols = gridCols;
  
  		grid.resize(gridCols*gridRows);
  		reset();
  	}