Hierarchical Anisotropic scaling

Comments

• Matthias

  August 2016 edited August 2016

  Hi Bob,

  Anisotropic scaling is not a core feature of KLayout, so I guess you are referring to a script like http://www.klayout.org/svn-public/klayout-resources/trunk/scripts/scale_anisotropic.lym.

  You can basically modify the script any way you want to achieve the desired result. The script currently treats all "solid" shapes (boxes, polygons, paths) in the same way. To preserve a path's width, you'll need to provide a separate scaling implementation for paths which you can readily derived from the polygon implementation (not tested):

        if obj.shape.is_path?
  
          path = obj.shape.path
          new_points = []
          path.each_point do |p|
            new_points.push(RBA::Point::new((p.x * fx + 0.5).floor, (p.y * fy + 0.5).floor))
          end
          path.points = new_points
          obj.shape.path = path
  
        elsif obj.shape.is_box? || obj.shape.is_polygon?
  
          ...
  
        end
  

  I'd like to add however, that a true hierarchical implementation of anisotropic scaling (or any anisotropic operation) requires formation of cell variants in the general case: a cell may be placed rotated plus non-rotated. Both versions need to be handled differently so you'll need to create two variants. That is not a trivial algorithm and in general variant building is not desired when doing manual layout. That's why there is only little support for anisotropic operations.

  Matthias