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#!/usr/bin/env python
import random
from vtk import *
n = 10000
qinit = vtkQtInitialization()
pd = vtkPolyData()
pts = vtkPoints()
verts = vtkCellArray()
orient = vtkDoubleArray()
orient.SetName('orientation')
label = vtkStringArray()
label.SetName('label')
for i in range(n):
pts.InsertNextPoint(random.random(), random.random(), random.random())
verts.InsertNextCell(1)
verts.InsertCellPoint(i)
orient.InsertNextValue(random.random()*360.0)
label.InsertNextValue(str(i))
pd.SetPoints(pts)
pd.SetVerts(verts)
pd.GetPointData().AddArray(label)
pd.GetPointData().AddArray(orient)
hier = vtkPointSetToLabelHierarchy()
hier.SetInputData(pd)
hier.SetOrientationArrayName('orientation')
hier.SetLabelArrayName('label')
hier.GetTextProperty().SetColor(0.0, 0.0, 0.0)
lmapper = vtkLabelPlacementMapper()
lmapper.SetInputConnection(hier.GetOutputPort())
strategy = vtkQtLabelRenderStrategy()
lmapper.SetRenderStrategy(strategy)
lmapper.SetShapeToRoundedRect()
lmapper.SetBackgroundColor(1.0, 1.0, 0.7)
lmapper.SetBackgroundOpacity(0.8)
lmapper.SetMargin(3)
lactor = vtkActor2D()
lactor.SetMapper(lmapper)
mapper = vtkPolyDataMapper()
mapper.SetInputData(pd)
actor = vtkActor()
actor.SetMapper(mapper)
ren = vtkRenderer()
ren.AddActor(lactor)
ren.AddActor(actor)
ren.ResetCamera()
win = vtkRenderWindow()
win.AddRenderer(ren)
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(win)
iren.Initialize()
iren.Start()
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