/** @param grids */
  private void calcGeometry(SuperGrid<BPMNElement> grids) {
    grids.pack();
    heightOfRow = new double[grids.getHeight()];
    widthOfColumn = new double[grids.getWidth()];
    // initialize with standard values
    Arrays.fill(heightOfRow, CELL_HEIGHT);
    Arrays.fill(widthOfColumn, CELL_WIDTH);
    // find biggest
    int row = 0;
    int column = 0;
    for (Row<BPMNElement> r : grids) {
      column = 0;
      for (Cell<BPMNElement> c : r) {
        if (c.isFilled()) {
          BPMNElement elem = c.getValue();
          LayoutingBounds geom = elem.getGeometry();
          widthOfColumn[column] = Math.max(widthOfColumn[column], geom.getWidth() + CELL_MARGIN);
          heightOfRow[row] = Math.max(heightOfRow[row], geom.getHeight() + CELL_MARGIN);
        }
        column++;
      }
      row++;
    }

    // calc width / height
    widthOfSuperGrid = 0;
    for (double columnWidth : widthOfColumn) {
      widthOfSuperGrid += columnWidth;
    }
    heightOfSuperGrid = 0;
    for (double rowHeight : heightOfRow) {
      heightOfSuperGrid += rowHeight;
    }

    poolWidth = maxLaneDepth * LANE_HEAD_WIDTH;
    poolWidth += widthOfSuperGrid;
  }