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delete specific layer shapes below a hierarchical level

AndyAndy
in Python scripting

I'm trying to delete all shapes belong to a specific layer within only non-top cells, i.e. all the cells referred by top cells.
I find reference in this forum about how to perform some operations within all cells, such as

    layout = pya.CellView.active().layout()
    for cell in layout.each_cell()
        cell.clear(layer1)

But I don't know how to tell if the cell is a non-top cell that I want to perform this operation to.

Thank you for your help!

Comments

  • MatthiasMatthias

    @Andy Actually that is very simple: a top cell is one without parents, so you need to check if "parent_cells" is not zero:

    for cell in layout.each_cell():
    if cell.parent_cells() > 0:
        cell.clear(layer1)

    For large layouts, it may be more efficient to first collect all cells you want to treat and then clear the layer on these cells. The reason is that "parent_cells" is a computed property and "clear" will make the layout modified. This will trigger re-computation on every parent_cells call.

    cells_to_clear = []
for cell in layout.each_cell():
    if cell.parent_cells() > 0:
        cells_to_clear.append(cell)
for cell in cells_to_clear:
    cell.clear(layer1)

    Matthias

  • AndyAndy

    Matthias, Thank you! It works as intended!

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