code: public void setExtent( JGTProcessingRegion region ) {
          west = region.getWest();
          east = region.getEast();
          south = region.getSouth();
          north = region.getNorth();
          rows = region.getRows();
          cols = region.getCols();
          fixResolution();
          fixRowsAndCols();
      }
docs: Sets the extent of this window using another window.
  
  @param win another window object