code: private Point getCellPoint() {
          double x1 = (minX + cellI * deltaX) + (deltaX / 2d);
          double y1 = (minY + cellJ * deltaY) + (deltaY / 2d);
          cellI++;
          return GF.createPoint(new Coordinate(x1, y1));
      }
docs: Compute the point of the cell
  
  @return Center point of the cell