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package require vtk
package require vtkinteraction
# demonstrate labeling of contour with scalar value
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Read a slice and contour it
vtkVolume16Reader v16
v16 SetDataDimensions 64 64
[v16 GetOutput] SetOrigin 0.0 0.0 0.0
v16 SetDataByteOrderToLittleEndian
v16 SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
v16 SetImageRange 45 45
v16 SetDataSpacing 3.2 3.2 1.5
vtkContourFilter iso
iso SetInputConnection [v16 GetOutputPort]
iso GenerateValues 6 500 1150
iso Update
set numPts [[iso GetOutput] GetNumberOfPoints]
vtkPolyDataMapper isoMapper
isoMapper SetInputConnection [iso GetOutputPort]
isoMapper ScalarVisibilityOn
eval isoMapper SetScalarRange [[iso GetOutput] GetScalarRange]
vtkActor isoActor
isoActor SetMapper isoMapper
# Subsample the points and label them
vtkMaskPoints mask
mask SetInputConnection [iso GetOutputPort]
mask SetOnRatio [expr $numPts / 50]
mask SetMaximumNumberOfPoints 50
mask RandomModeOn
# Create labels for points - only show visible points
vtkSelectVisiblePoints visPts
visPts SetInputConnection [mask GetOutputPort]
visPts SetRenderer ren1
vtkLabeledDataMapper ldm
ldm SetInputConnection [mask GetOutputPort]
ldm SetLabelFormat "%g"
ldm SetLabelModeToLabelScalars
set tprop [ldm GetLabelTextProperty]
$tprop SetFontFamilyToArial
$tprop SetFontSize 10
$tprop SetColor 1 0 0
vtkActor2D contourLabels
contourLabels SetMapper ldm
# Add the actors to the renderer, set the background and size
#
ren1 AddActor2D isoActor
ren1 AddActor2D contourLabels
ren1 SetBackground 1 1 1
renWin SetSize 500 500
renWin Render
[ren1 GetActiveCamera] Zoom 1.5
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# prevent the tk window from showing up then start the event loop
wm withdraw .
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