#!/usr/bin/env python

# Create the RenderWindow, Renderer and both Actors
#
ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.SetMultiSamples(0)
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# pipeline stuff
#
sphere = vtk.vtkSphereSource()
sphere.SetPhiResolution(10)
sphere.SetThetaResolution(20)
xform = vtk.vtkTransformCoordinateSystems()
xform.SetInputConnection(sphere.GetOutputPort())
xform.SetInputCoordinateSystemToWorld()
xform.SetOutputCoordinateSystemToDisplay()
xform.SetViewport(ren1)
gs = vtk.vtkGlyphSource2D()
gs.SetGlyphTypeToCircle()
gs.SetScale(20)
gs.FilledOff()
gs.CrossOn()
gs.Update()
# Create a table of glyphs
glypher = vtk.vtkGlyph2D()
glypher.SetInputConnection(xform.GetOutputPort())
glypher.SetSourceData(0,gs.GetOutput())
glypher.SetScaleModeToDataScalingOff()
mapper = vtk.vtkPolyDataMapper2D()
mapper.SetInputConnection(glypher.GetOutputPort())
glyphActor = vtk.vtkActor2D()
glyphActor.SetMapper(mapper)
# Add the actors to the renderer, set the background and size
#
ren1.AddActor(glyphActor)
ren1.SetBackground(0,0,0)
renWin.SetSize(300,300)
iren.Initialize()
renWin.Render()
# render the image
#
# prevent the tk window from showing up then start the event loop
# --- end of script --
