/**
     * An iso level can be made of multiple regions with holes in them. This builds one path (into
     * the passed GeneralPath) that represents one connected contour.
     *
     * @param isoData Marching-cubes classification at each cell
     * @param isoDivided The boolean above/below classification for each cell (to disambiguate
     *     saddles)
     * @param iso The path to build into
     */
    public static void stichContour(
        Aggregates<MC_TYPE> isoData,
        Aggregates<Boolean> isoDivided,
        GeneralPath iso,
        int startX,
        int startY) {
      int x = startX, y = startY;

      SIDE prevSide = SIDE.NONE;

      // Found an unambiguous iso line at [r][c], so start there.
      MC_TYPE startCell = isoData.get(x, y);
      Point2D nextPoint = startCell.firstSide(prevSide).nextPoint(x, y);
      iso.moveTo(nextPoint.getX(), nextPoint.getY());
      prevSide = isoData.get(x, y).secondSide(prevSide, isoDivided.get(x, y));

      // System.out.printf("-------------------\n);

      do {
        // Process current cell
        MC_TYPE curCell = isoData.get(x, y);
        nextPoint = curCell.secondSide(prevSide, isoDivided.get(x, y)).nextPoint(x, y);
        // System.out.printf("%d,%d: %s\n",x,y,curCell.secondSide(prevSide, isoDivided.get(x,y)));
        iso.lineTo(nextPoint.getX(), nextPoint.getY());
        SIDE nextSide = curCell.secondSide(prevSide, isoDivided.get(x, y));
        isoData.set(x, y, curCell.clearWith()); // Erase this marching cube line entry

        // Advance for next cell
        prevSide = nextSide;
        switch (nextSide) {
          case LEFT:
            x -= 1;
            break;
          case RIGHT:
            x += 1;
            break;
          case BOTTOM:
            y += 1;
            break;
          case TOP:
            y -= 1;
            break;
          case NONE:
            throw new IllegalArgumentException(
                "Encountered side NONE after starting contour line.");
        }

      } while (x != startX || y != startY);
      iso.closePath();
    }
 @Override
 public void set(int x, int y, A val) {
   base.set(x, y, val);
 }