Create a clip of GDS at (30,30) to (110,110). Write out clip GDS via script.

rounak1068

Here I have to create a clip of GDS from specific location and save to clip as a new GDS via Script.
kindly provide me the correct way.

rounak1068

@EugeneZelenko, @Vincent Lin kindly look into that.

Matthias

@rounak1068 Here is a related post: https://www.klayout.de/forum/discussion/comment/8701#Comment_8701

The code is somewhat older. You can write it today like this:

layout = RBA::CellView::active.layout

# Box in micron units:
clip_rect = RBA::DBox::new(30.0, 30.0, 110.0, 110.0)

# create a clip cell and write it:
clip_cell = layout.clip(layout.cell("TOP"), clip_rect)
clip_cell.write("clip.gds")

Matthias

rounak1068

In above script I got error (No overload with matching arguments in Layout.clip)

rounak1068

@Matthias , kindly look into it. I got error while run above code.

rounak1068

here is my code but not working.

import pya

input_gds = "abc.gds"
KLAYOUT = pya.Layout()
KLAYOUT.read(input_gds)

top_cell = KLAYOUT.top_cell()

clip_rect = pya.DBox(50.0, 50.0, 100, 100.0)

clip_cell = KLAYOUT.create_cell("CLIP")

top_cell.clip_into(clip_cell, clip_rect)

output_gds = "outputnew.gds"
clip_cell.write(output_gds)

Vincent Lin

@rounak1068

The code from Matthias belongs to " Ruby "
if you are fan of Python, please try below

import pya

layout = pya.CellView.active().layout()

# Box in micron units:
clip_rect = pya.DBox(30.0, 30.0, 110.0, 110.0)

# create a clip cell and write it:
clip_cell = layout.clip(layout.cell("TOP"), clip_rect)
clip_cell.write("clip.gds")

Just remind, your top cell naming should be " TOP "

Vincent

rounak1068

@Vincent Lin, I tried this also but I'm getting error (No overload with matching arguments in Layout.clip)

rounak1068

That ruby code given by @Matthias, I tried in ruby environment. Same error I'm getting.

rounak1068

@Matthias, now I got the point, for clipping top-Cell name is mandatory otherwise tool is got confuse which cell you are selecting.

here is my code that is working fine but kindly review once, that my approach is correct or not ?

KLAYOUT = pya.Layout()
layout = pya.CellView.active().layout()
gds_files = ["abc.gds"]

for gds_file in gds_files:
KLAYOUT.read(gds_file)
top_cell = None
max_area = 0
for cell in KLAYOUT.each_cell():
bbox = cell.bbox()
area = bbox.width() * bbox.height()
if area > max_area:
top_cell = cell
max_area = area

print(f"Found top-level cell: {top_cell.name}")

clip_rect = pya.DBox(50.0, 50.0, 110.0, 110.0)

clip_cell = layout.clip(top_cell, clip_rect)
clip_cell.write("clip.gds")

In above script first I'm finding top-cell name then I'm doing clipping operation.

rounak1068

@Matthias, In your Code also If I'm giving top cell name, then its working fine

Matthias

@rounak1068 If you have a single top cell, you can use layout.top_cell() to get the Cell object of this cell. You don't need to know the top cell name. But it will fail, if your layout contains multiple top cells.

Matthias