How to erase polygons from each other

Eisei

Hi,

In the menu are the options "add", "merge", "erase", "mask" and "diff" for polygons.

For "merge" I use:

edge = EdgeProcessor.new
edge.simple_merge_p2p([polygon_1, polygon_2], false, false, 1)

For "diff" I use:

edge.simple_merge_p2p([polygon_1, polygon_2], false, false, 0)

For "mask" I use:

edge.simple_merge_p2p([polygon_1, polygon_2], false, false, 2)

I couldn't figure out how I can get "erase" to work. Is it possible with the same "simple_merge_p2p" or something completely different?

Thanks
Stefan

david234589

Not sure if this is what you want but there is an erase method in Shapes. http://klayout.de/doc/code/class_Shapes.html

So you could do

module EraseSelectedShape

  app = RBA::Application.instance
  mw = app.main_window

  lv = mw.current_view
  if lv == nil
    raise "No view selected"
  end

  lv.transaction("Erase selected shape")
  begin

    lv.each_object_selected do |obj|
      obj.shape.shapes.erase(obj.shape)
    end

    ensure 
    lv.commit
  end

end

Matthias

Hallo,

"erase" in the menu is basically a boolean "not", "mask" is "and" and "diff" is "xor".

Is that comment helpful?

Matthias

Matthias

Here's one more comment:

The boolean operations are available with EdgeProcessor#boolean_p2p:

# "not" aka "erase":
edge.boolean_p2p([ polygon_1 ], [ polygon_2 ], EdgeProcessor::ModeANotB, false, false)

# "xor" aka "diff":     
edge.boolean_p2p([ polygon_1 ], [ polygon_2 ], EdgeProcessor::ModeXor, false, false)

# "and" aka "mask":
edge.boolean_p2p([ polygon_1 ], [ polygon_2 ], EdgeProcessor::ModeAnd, false, false)

It's worth a note that using the boolean operations has some advantages over "simple_merge". The boolean operations will normalize self-overlapping regions of the original polygons automatically for example.

Matthias