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package require vtk
package require vtkinteraction
# read in a Chaco file
vtkChacoReader chReader
chReader SetBaseName "$VTK_DATA_ROOT/Data/vwgt"
chReader SetGenerateGlobalElementIdArray 1
chReader SetGenerateGlobalNodeIdArray 1
chReader SetGenerateEdgeWeightArrays 1
chReader SetGenerateVertexWeightArrays 1
vtkGeometryFilter geom
geom SetInputConnection [chReader GetOutputPort]
vtkPolyDataMapper mapper
mapper SetInputConnection [geom GetOutputPort]
mapper SetColorModeToMapScalars
mapper SetScalarModeToUsePointFieldData
mapper SelectColorArray "VertexWeight1"
mapper SetScalarRange 1 5
vtkActor actor0
actor0 SetMapper mapper
# Create the RenderWindow, Renderer and interactor
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Add the actor to the renderer, set the background and size
#
ren1 AddActor actor0
ren1 SetBackground 0 0 0
renWin SetSize 300 300
renWin SetMultiSamples 0
iren Initialize
renWin Render
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# prevent the tk window from showing up then start the event loop
wm withdraw .
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