Reply To: Merge two structures

[Ronald]

In the case of merging polygons in a cell, the cell_iter() can help out, like described in the example below. The merge_cell_polygons function returns a new cell with the merged result, although the pyclipper may not handle all cases as desired for GDS.

import nazca as nd
from collections import defaultdict

def merge_cell_polygons(cell):
    """Flatten a cell and merge polygons per layer.
   
    Args:
        cell (Cell): cell to flatten and merge polygon of.

    Returns:
        Cell: flattened cell with merged polygons per layer.
    """
    layerpgons = defaultdict(list)
    for P in nd.cell_iter(cell, flat=True):
        if P.cell_start:
            for pgon, xy, bbox in P.iters['polygon']:
                layerpgons[pgon.layer].append(xy)
    with nd.Cell(name=f"{cell.cell_name}_merged") as C:
        for layer, pgons in layerpgons.items():
            merged = nd.clipper.merge_polygons(pgons)
            for pgon in merged:
                nd.Polygon(points=pgon, layer=layer).put(0)
    return C

with nd.Cell('test') as my_cell:
    # add content

merged_cell = merge_cell_polygons(my_cell)
merged_cell.put()

Ronald