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package require vtk
package require vtkinteraction
# Demonstrate how to use the vtkAffineWidget to apply affine transforms
# ( translate, scale, rotate, shear ) to an actor.
# Start by reading in data
#
vtkVolume16Reader v16
v16 SetDataDimensions 64 64
v16 SetDataByteOrderToLittleEndian
v16 SetImageRange 1 93
v16 SetDataSpacing 3.2 3.2 1.5
v16 SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
v16 ReleaseDataFlagOn
v16 SetDataMask 0x7fff
v16 Update
set range [[v16 GetOutput] GetScalarRange]
# vtkImageActor requires unsigned char or unsigned short data, so
# we will transform the data with a linear shift/scale filter.
#
vtkImageShiftScale shifter
shifter SetShift [ expr -1.0*[lindex $range 0] ]
shifter SetScale [ expr 255.0 /( [lindex $range 1] - [lindex $range 0] ) ]
shifter SetOutputScalarTypeToUnsignedChar
shifter SetInputConnection [ v16 GetOutputPort ]
shifter ReleaseDataFlagOff
shifter Update
# An actor to display one slice of 3D image data.
#
vtkImageActor imageActor
[imageActor GetMapper] SetInputConnection [shifter GetOutputPort]
imageActor VisibilityOn
imageActor SetDisplayExtent 0 63 0 63 46 46
imageActor InterpolateOn
scan [ imageActor GetBounds ] "%f %f %f %f %f %f" \
xMin xMax yMin yMax zMin zMax
# Create a renderer and a render window,
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
# Create an interactor to respond to mouse events.
#
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Create an interactor style that works specifically with images:
# middle button: pan image
# right button: zoom image
# left button + ctrl key: rotate image
#
vtkInteractorStyleImage style
iren SetInteractorStyle style
# VTK widgets consist of two parts: the widget part that handles event processing;
# and the widget representation that defines how the widget appears in the scene
# (i.e., matters pertaining to geometry). The affine 2D representation consists
# of a set of axes inside a circle set inside a box. Clicking on an edge or
# a corner of the box will set the scaling. Clicking the the axes will set
# the translation. Clicking on the circle and dragging along its circumference
# sets the rotation. Clicking on an edge while depressing the ctrl key will
# set the shear (currently not fully implemented).
#
vtkAffineRepresentation2D rep
rep SetBoxWidth 100
rep SetCircleWidth 75
rep SetAxesWidth 60
rep DisplayTextOn
rep PlaceWidget $xMin $xMax $yMin $yMax $zMin $zMax
vtkAffineWidget widget
widget SetInteractor iren
widget SetRepresentation rep
# Add an observer to apply the affine transform to the image actor at
# the end of interaction with the widget.
#
widget AddObserver EndInteractionEvent WidgetCallback
# Transorm generated by the affine widget's representation that
# will transform the image actor.
#
vtkTransform transform
# Add the actor to the renderer, set the background and size.
#
ren1 AddActor imageActor
ren1 SetBackground 0.1 0.2 0.4
renWin SetSize 600 600
# Render the image.
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize
# Prevent the tk window from showing up then start the event loop
wm withdraw .
proc WidgetCallback { } {
rep GetTransform transform
imageActor SetUserTransform transform
}
iren Start
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