Region

tomas2004

Hi Matthias,

I was wondering why there is no DRegion class?

Cheers,

Tomas

Matthias

Good question

But the reason is the same as there is no DCell, no DLayout etc. Region is only conceptually a collection of Polygons - internally it stores them as Shapes or even Layouts with DBU units. So a DRegion would be the same as a Region while a DPolygon for example is really something different than Polygon - it can store floating-point coordinates.

Region could accept and deliver DPolygon if it had a DBU attribute - converting them into integer objects before it stores them. That is basically a small step, but it's simply not done yet.

A convenient way to emulate that is to use a transformation:

to_um = pya.CplxTrans(dbu)
from_um = to_um.inverted()

region = pya.Region()
dpolygon = pya.DPolygon(...)
region.insert(from_um * dpolygon)
...

for polygon in region.each():
  dpolygon = to_um * polygon
  ...

Matthias

tomas2004

Ok, thanks for the info!

Cheers,

Tomas