klayout macro qt area calculator

calc_area.py

import pya

class AreaCalculator(pya.QDialog):
  """
  This class implements a dialog for calculating area of shapes
  in a layout. The calculator adds up shapes in the currently
  selected cell and below.
  """

  def button_clicked(self, checked):
    """ Event handler: "Calculate area" button clicked """

    view = pya.Application.instance().main_window().current_view()
    layout = view.cellview(0).layout()
    cell = view.cellview(0).cell
    #create KLayout region object to use for grabbing shapes
    reg = pya.Region()
    total_area = 0
    
    #1/0, 2/0
    layer_input = self.layer_input.selectedItems()
    layer_input = [j.text for j in layer_input]
    #layer_input = self.layer_input.text
    #layer_input =  layer_input.split(",")
    #layer_input = [j.strip() for j in layer_input]
    
    layer_indexes = layout.layer_indexes()
    for idx,lyr in enumerate(layout.layer_infos()):
      if str(lyr) in layer_input:
        #Use the Region insert function on a recursive shape iterator
        #that is a function of the layout. This handles all the 
        #complicated work of finding shapes in the current cell and
        #all child cells.
        reg.insert(layout.begin_shapes(cell,layer_indexes[idx]))
    total_area += reg.area()/1e6

    # get the area and place it in the qt dialog
    self.area.setText("Total Area: "+str(total_area))

  def __init__(self, parent = None):
    """ Dialog constructor """
    
    super(AreaCalculator, self).__init__()

    self.setWindowTitle("Area Calculator")

    self.resize(400, 120)

    qt_layout = pya.QVBoxLayout(self)
    self.setLayout(qt_layout)
    
    self.layer_label = pya.QLabel("Select the layers", self)
    qt_layout.addWidget(self.layer_label)
    
    #original implementation using a textbox for getting the layers
    #self.layer_input = pya.QLineEdit('',self)
    #qt_layout.addWidget(self.layer_input)
    
    #second implementation where we pull layers from the file, and
    #display them in a dropdown menu (QListWidget)
    view = pya.Application.instance().main_window().current_view()
    layout = view.cellview(0).layout()
    layers = layout.layer_infos()
    layers = [str(j) for j in layers]
    self.layer_input = pya.QListWidget(self)
    self.layer_input.setSelectionMode(pya.QAbstractItemView.ExtendedSelection)
    self.layer_input.addItems(layers)
    qt_layout.addWidget(self.layer_input)

    self.area = pya.QLabel("Press the button to calculate the area", self)
    qt_layout.addWidget(self.area)

    button = pya.QPushButton('Calculate area', self)
    button.setFont(pya.QFont('Times', 18, pya.QFont.Bold))
    qt_layout.addWidget(button)
    
    # attach the event handler
    button.clicked(self.button_clicked)

# Instantiate the dialog and make it visible initially.
# Passing the main_window will make it stay on top of the main window.
dialog = AreaCalculator(pya.Application.instance().main_window())
dialog.show()