"""
A sort of minimal example of how to embed a rendering window
into a qt application.
"""
print(__doc__)
import sys
from PyQt5 import Qt
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
import vtk

from vtkplotter import *

class MainWindow(Qt.QMainWindow):
    def __init__(self, parent=None):

        Qt.QMainWindow.__init__(self, parent)
        self.frame = Qt.QFrame()
        self.vl = Qt.QVBoxLayout()
        self.vtkWidget = QVTKRenderWindowInteractor(self.frame)
        self.vl.addWidget(self.vtkWidget)

        p = Plotter(qtWidget=self.vtkWidget, axes=4, bg='lightblue')

        a = Cube()
        a.flat()
        a.c('gold')
        p.add(a)

        p.show()      # create renderer and add the actors

        # Manually create the silhouette actor and add to the renderer.
        dataset = a.GetMapper().GetInputAsDataSet()
        outline = vtk.vtkPolyDataSilhouette()
        outline.SetInputData(dataset)
        outline.SetEnableFeatureAngle(True)
        outline.SetCamera(p.renderers[0].GetActiveCamera())
        outline.SetBorderEdges(True)
        outlineMapper = vtk.vtkPolyDataMapper()
        outlineMapper.SetInputConnection(outline.GetOutputPort())

        actor = vtk.vtkActor()
        actor.SetMapper(outlineMapper)
        actor.GetProperty().SetColor(0, 0, 0)
        actor.GetProperty().SetLineWidth(4)

        p.renderers[0].AddActor(actor)


        # set-up the rest of the Qt window
        self.frame.setLayout(self.vl)
        self.setCentralWidget(self.frame)

        self.show()    # <--- show the Qt Window


if __name__ == "__main__":
    app = Qt.QApplication(sys.argv)
    window = MainWindow()
    app.exec_()