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#!/usr/bin/env python
from vtkmodules.vtkCommonCore import vtkPoints
from vtkmodules.vtkCommonDataModel import (
vtkCellArray,
vtkPolyData,
)
from vtkmodules.vtkFiltersModeling import vtkContourLoopExtraction
from vtkmodules.vtkRenderingCore import (
vtkActor,
vtkPolyDataMapper,
vtkRenderWindow,
vtkRenderWindowInteractor,
vtkRenderer,
)
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Create the RenderWindow, Renderer
#
ren = vtkRenderer()
renWin = vtkRenderWindow()
renWin.AddRenderer( ren )
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Create test data. Some simple incomplete loops that touch the boundary.
#
loopData = vtkPolyData()
loopPts = vtkPoints()
loopLines = vtkCellArray()
loopData.SetPoints(loopPts)
loopData.SetLines(loopLines)
loopPts.InsertPoint(0, -1, -2, 0)
loopPts.InsertPoint(1, 1, -2, 0)
loopPts.InsertPoint(2, -1, -1, 0)
loopPts.InsertPoint(3, 1, -1, 0)
loopPts.InsertPoint(4, -2, 0, 0)
loopPts.InsertPoint(5, -1, 0, 0)
loopPts.InsertPoint(6, -1, 0.5, 0)
loopPts.InsertPoint(7, -1, 1, 0)
loopPts.InsertPoint(8, -2, 1, 0)
# Along x-bottom boundary
loopLines.InsertNextCell(2)
loopLines.InsertCellPoint(0)
loopLines.InsertCellPoint(2)
loopLines.InsertNextCell(2)
loopLines.InsertCellPoint(3)
loopLines.InsertCellPoint(1)
loopLines.InsertNextCell(2)
loopLines.InsertCellPoint(2)
loopLines.InsertCellPoint(3)
# Along y-left-side boundary
loopLines.InsertNextCell(3)
loopLines.InsertCellPoint(4)
loopLines.InsertCellPoint(5)
loopLines.InsertCellPoint(6)
loopLines.InsertNextCell(2)
loopLines.InsertCellPoint(6)
loopLines.InsertCellPoint(7)
loopLines.InsertNextCell(2)
loopLines.InsertCellPoint(7)
loopLines.InsertCellPoint(8)
contours = vtkContourLoopExtraction()
contours.SetInputData(loopData)
mapper = vtkPolyDataMapper()
mapper.SetInputConnection(contours.GetOutputPort())
#mapper.SetInputData(loopData)
actor = vtkActor()
actor.SetMapper(mapper)
ren.AddActor(actor)
renWin.Render()
iren.Start()
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