separate the donuts shape to 4 pieces of rectangle

kmho

Hi Matthias,
I'm wondering if I can separate the donuts shape (A) to 4 pieces of rectangle (B) ?

BG,
KM

dick_freebird

You could cut (subtract) along the inner vertical edges and
stretch (Partial) to re-butt the ends of the horizontal edges?
At least that's how I'd do it, by hand knowing only what I know.

If your question was how to script it, I got nuthin'.

kmho

Hi Dick, Thanks for your feedback, if I do it by hand, I'll use your method.
Yes, my question is how to do it by python script.
Anyway, really appreciate your comment. Thanks.

Matthias

Hi kmho,

the method you're looking for is "Polygon#decompose_trapezoids". It will give you a set of smaller (4 corners max) polygons from a bigger one.

Regards,

Matthias

kmho

Thanks Matthias. It's exactly what I'm need.

laurent_c

I have tried to use this decompose_trapezoids method, but my syntax is no good in my LVS file :

POLY = polygons(1,0)
ACTIVE = polygons(2,0)
Gates = POLY & ACTIVE
Gates_as_quadrilaters = Gates.decompose_trapezoids

There is probably something missing between Gates and decompose_trapezoids ?
Regards,
Laurent

Matthias

Hi Laurent,

"decompose_trapezoids" is not available as a DRC or LVS function (yet). It is a method the of "Region" class.

But there is a workaround: every DRC or LVS layer has a member called "data" which is the internal "Region" object. Here is how you can use "decompose_trapezoids":

decomposed = layer.data.decompose_trapezoids_to_region

"decomposed" is a "Region" object, not a DRC layer. If you want a DRC layer, you can use:

decomposed = layer.dup
decomposed.data = layer.data.decompose_trapezoids_to_region

There is a related discussion on this: https://www.klayout.de/forum/discussion/1827

As discussed in our other thread, you can also use"delaunay" instead of "decompose_trapezoids" which gives a constrained Delaunay triangulation avoiding skinny shapes for example.

Best regards,

Matthias