How to make layout view active or visible?

Comments

• Matthias

  January 2020

  Hi Mike,

  The core idea is to work with layout views rather than layout objects (pya.Layout). Layout objects are standalone and not connected with the views.

  1. To create a layout within a view use

  pya.MainWindow.instance().create_layout()
  view = pya.LayoutView.current()
  L = pya.CellView.active().layout()
  

  2. To save the layer properties use

  view.save_layer_props(filename)
  

  Your SetupLayer should then use "view" to set the layer properties.

  Regards,

  Matthias
• mpwalsh8

  January 2020

  Thanks for looking at my problem. I've made some progress but it seems like I've taken one step forward and two steps back. Now my GDS loads and the layer properties save correctly but now I don't have any shapes in my layout. I am expecting a polygon on 100/0 but I have no layers at all.

  import pya
  
  pya.MainWindow.instance().create_layout(0)
  view = pya.LayoutView.current()
  lp = pya.LayerProperties()
  lp.visible = True
  L = pya.CellView.active().layout()
  TOP = L.create_cell("TOP")
  
  li = pya.LayerInfo(100, 0, "PartOutline")
  lp.source_layer = 100
  lp.datatype = 0
  lp.name = "PartOutline"
  lp.source_name = "PartOutline"
  view.insert_layer(view.end_layers(), lp)
  
  po = []
  po.append(pya.Point(0, 0))
  po.append(pya.Point(720990, 0))
  po.append(pya.Point(720990, 723456))
  po.append(pya.Point(0, 723456))
  TOP.shapes(li.layer).insert(pya.Polygon(po))
  
  opt = pya.SaveLayoutOptions()
  opt.set_format_from_filename("test.gds")
  L.write("test.gds")
  view.save_layer_props("test.lyp")
  view.load_layout("test.gds", 0)
  view.load_layer_props("test.lyp")
  

  I am clearly struggling with comprhending the layout vs view models and I am sure my mistake is probably pretty simple but I can't see it. ;-)

  What am I missing?
• mpwalsh8

  January 2020

  I've made some further progress this evening. In fact, for the most part what I am trying to do is working. The only issue I am running into now is when I try to run my script as batch script from the command line it doesn't generate a GDS file. If I run the same script from the Macro Development GUI it runs to completion and I end up with the GDS file.

  This is my current solution:

  import pya
  
  class GDSLayer:
  
      li = None
      lp = None
      lyr = None
  
      def __init__(self, num, dt, name):
          self.num = num
          self.dt = dt
          self.name = name
  
      def Add(self, layout):
          self.lyr = layout.layer(self.num, self.dt)
  
      def View(self, view):
          if view is not None:
              view.add_missing_layers()
              self.li = view.begin_layers()
              while not self.li.at_end():
                  self.lp = self.li.current()
                  if ((self.lp.source_layer == self.num) and (self.lp.source_datatype == self.dt)):
                      self.lp.name = self.name
                      self.lp.visible = True
                  self.lp = self.li.next()
  
  L = pya.Layout()
  TOP = L.create_cell("TOP")
  
  Part_Outline = GDSLayer(100, 0, "Part_Outline")
  Part_Outline.Add(L)
  
  po = []
  po.append(pya.Point(0, 0))
  po.append(pya.Point(2700000, 0))
  po.append(pya.Point(2700000, 2700000))
  po.append(pya.Point(0, 2700000))
  TOP.shapes(Part_Outline.lyr).insert(pya.Polygon(po))
  
  L.write("t.gds")
  
  if pya.MainWindow.instance() is not None:
      pya.MainWindow.instance().create_layout(0)
      view = pya.LayoutView.current()
      view.load_layout("t.gds", 0)
      Part_Outline.View(view)
      view.save_layer_props("t.lyp")
  

  I am getting close. I don't see anything obvious as to why this wouldn't run in -b mode.
• Matthias

  February 2020

  There are different batch modes available. Some have a main window, some don't. "klayout -b" will enter "bare metal" batch mode where there is no main window and "pya.MainWindow.instance()" will be None.

  I tried your script in this mode:

  klayout -z -r yourscript.py
  

  and for me I got "t.gds" and "t.lyp" files. You can also add "-nc -rx" which avoids side effects such as updating the configuration file.

  Matthias
• mpwalsh8

  February 2020

  Thanks, I can replicate the results using the same switches so that works for me!

  Last question (I hope) - can I do the same on Windows? When I use the same command I don't see any results and "klayout_app -h" on the Windows command line doesn't return anything like it does on Linux.
• Matthias

  February 2020

  KLayout isn't compiled as a console application on Windows (as then an ugly command terminal pops up), so it won't print anything to the console.

  But if you use a bash from cygwin or MSYS it will do. Also redirection to a file should work.

  Matthias
• wsteffe

  May 2022

  Hi all,
  I am trying to use klayout python module.
  First thing I would like to load a dxf file and visualize it from a python script.
  I have tried with the following code (inspired by this thread):

  import pya
  pya.MainWindow.instance().create_layout(0)
  view=pya.LayoutView.current()
  L =pya.CellView.active().layout()
  filePath=...
  L.read(filePath)
  view.show()

  Unfortunately it breaks at the second line with following error message:

  AttributeError: module 'pya' has no attribute 'MainWindow'