How to modify some polygons with multiple points?

Comments

• blueman_44

  September 26 edited September 26

  The 'smooth' function might be good to use. It removes a specified 'roughness' of shapes.

  You can do this with the DRC engine here:
  https://www.klayout.de/doc-qt5/about/drc_ref_layer.html#smoothed
  Example

  #input layers
  metal = input(11, 0)
  
  #derived layers
  smooth_metal = metal.smoothed(5.um)
  smooth_metal.output("smoothed_metal")
  

  

  Or if you want a ruby/python implementation (good for applying to specific shapes):
  https://www.klayout.de/doc-qt5/code/class_Polygon.html#k_91

  Note: If you have geometries that have similar sizes as your roughness, then those will/may change.

  My brain wants to believe I saw some other methods while digging through documentation a few months ago, but I can't recall...

  Hope this helps, though.
• Weiling_Zheng

  September 28

  @blueman_44,

  Thank you very much for your respond.
  It makes effect in an easy way. I can get an approximate pattern in this way.

  Anyway, just to extend the knowledge, do you know how to get polygons points xy of all layers in a gds and to remove some points of those polygons?

  Best regards!
  Weiling
• blueman_44

  September 30

  In DRC you can do something like this to get all points per polygon in a string output:

  deep    #usually faster but you can remove to perform a flat operation
  
  #Go through each layer in current view
  layers.each {|lay|
      input(lay).data.each {|shape|
          puts "#{lay}|#{shape}"
      }
  }
  

  Here's a python way that can also work:

  cellview = pya.CellView.active()
  ly = cellview.layout()
  cell = cellview.cell
  
  input_layer = ly.layer(5, 0)   
  input_region = pya.Region(cell.begin_shapes_rec(input_layer)).merged()
  
  for shape in input_region.each():    
      poly = shape.to_simple_polygon()
      for point in poly.each_point():
          ...
  

  I don't believe you can remove points from polygons easily. My way would be to make a new polygon and insert the list of points you'd want to keep from the original.

  I did find another method to reduce amount of points on a polygon by removing redundant shapes:
  http://klayout.de/doc-qt5/code/class_Polygon.html#k_29

  You can also reference documentation here for polygon methods:
  https://klayout.de/doc-qt5/code/class_SimplePolygon.html
• jiunnweiyeh

  October 2

  Hi sir,
  I am layman for python, but here is the code I can provide to you for referece.
  maybe that can help you something.
  (check the pattern layer , if the number_points >20 , output it to another layer,
  of couse , you could base on that to process what your code.

  outs = polygon_layer
  dark=input(93,0)
  dark.each do |check_point|
  if check_point.num_points > 20 then
  outs.insert(check_point)
  end
  end
  outs.output(100,1000)
  
• jiunnweiyeh

  October 2

  Maybe you can base on this flow..

  1.check the number of points if that is more than 20 --->type A
  other -->type B

  type B , keep it.
  type A , smooth or remove some of points of each pattern.