How to select the polygon pattern (waveguide or electrode path) which has the specific point?

Ryan354

Hi, I've been learning klayout with python scripting and can do something like drawing a simple pattern, inserting the subcell, and writing out. However, I want to "select" the existing path (like waveguide or electrode path with known layer and datatype, and only showing in the top cell) and "edit" it such as modifying the polygon points, extract the points , or delete it only with python scripting.

Would you please show me a simple python script how to "select" the polygon which includes the specific point (such as the highest point of the specific layer/datatype in the top cell) and "modify" it only with python scripting instead of UI?

Thank you

Matthias

Hi,

here is a short sample script. Please see the comments for details:

lv = pya.LayoutView.current()
cv = pya.CellView.active()
ly = cv.layout()

# take shapes from GDS layer 1, datatype 0
layer_index = ly.layer(1, 0)

# get the shapes container of the current cell of this layer
shapes = cv.cell.shapes(layer_index)

# search point in micrometer units
pt = pya.DPoint(0.0, 10.0)  # JUST AN EXAMPLE

pt_in_dbu = pya.CplxTrans(ly.dbu).inverted() * pt

# undo/redo support
lv.transaction("Modify polygon")

for s in shapes.each_touching(pya.Box(pt_in_dbu, pt_in_dbu)):
  if s.is_polygon and s.polygon.inside(pt_in_dbu):
    # take polygon
    poly = s.polygon
    # modify it somehow (e.g. scale by 1.5)
    poly = poly * 1.5  # JUST AN EXAMPLE
    # store it back
    s.polygon = poly
    break

# undo/redo support
lv.commit()

Matthias

Ryan354

Thanks for replying, I just noticed this comment.
Thank you very much.