/usr/share/vtk/ImageProcessing/Tcl/ImageSlicing.tcl is in vtk-examples 5.8.0-17.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | package require vtk
package require vtkinteraction
# This example shows how to load a 3D image into VTK and then reformat
# that image into a different orientation for viewing. It uses
# vtkImageReslice for reformatting the image, and uses vtkImageActor
# and vtkInteractorStyleImage to display the image. This InteractorStyle
# forces the camera to stay perpendicular to the XY plane.
# Start by loading some data.
vtkImageReader2 reader
reader SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
reader SetDataExtent 0 63 0 63 1 93
reader SetDataSpacing 3.2 3.2 1.5
reader SetDataOrigin 0.0 0.0 0.0
reader SetDataScalarTypeToUnsignedShort
reader UpdateWholeExtent
# Calculate the center of the volume
[reader GetOutput] UpdateInformation
set extent [[reader GetOutput] GetWholeExtent]
set spacing [[reader GetOutput] GetSpacing]
set origin [[reader GetOutput] GetOrigin]
set xMin [lindex $extent 0]
set xMax [lindex $extent 1]
set yMin [lindex $extent 2]
set yMax [lindex $extent 3]
set zMin [lindex $extent 4]
set zMax [lindex $extent 5]
set xSpacing [lindex $spacing 0]
set ySpacing [lindex $spacing 1]
set zSpacing [lindex $spacing 2]
set x0 [lindex $origin 0]
set y0 [lindex $origin 1]
set z0 [lindex $origin 2]
set xCenter [expr $x0 + $xSpacing * 0.5 * ($xMin + $xMax)]
set yCenter [expr $y0 + $ySpacing * 0.5 * ($yMin + $yMax)]
set zCenter [expr $z0 + $zSpacing * 0.5 * ($zMin + $zMax)]
# Matrices for axial, coronal, sagittal, oblique view orientations
vtkMatrix4x4 axial
set elements { 1 0 0 $xCenter
0 1 0 $yCenter
0 0 1 $zCenter
0 0 0 1}
for {set i 0} {$i < 16} {incr i} {
axial SetElement [expr $i / 4] [expr $i % 4] [expr [lindex $elements $i]]
}
vtkMatrix4x4 coronal
set elements { 1 0 0 $xCenter
0 0 1 $yCenter
0 -1 0 $zCenter
0 0 0 1}
for {set i 0} {$i < 16} {incr i} {
coronal SetElement [expr $i / 4] [expr $i % 4] [expr [lindex $elements $i]]
}
vtkMatrix4x4 sagittal
set elements { 0 0 -1 $xCenter
1 0 0 $yCenter
0 -1 0 $zCenter
0 0 0 1}
for {set i 0} {$i < 16} {incr i} {
sagittal SetElement [expr $i / 4] [expr $i % 4] [expr [lindex $elements $i]]
}
vtkMatrix4x4 oblique
set elements { 1 0 0 $xCenter
0 0.866025 -0.5 $yCenter
0 0.5 0.866025 $zCenter
0 0 0 1 }
for {set i 0} {$i < 16} {incr i} {
oblique SetElement [expr $i / 4] [expr $i % 4] [expr [lindex $elements $i]]
}
# Extract a slice in the desired orientation
vtkImageReslice reslice
reslice SetInputConnection [reader GetOutputPort]
reslice SetOutputDimensionality 2
reslice SetResliceAxes sagittal
reslice SetInterpolationModeToLinear
# Create a greyscale lookup table
vtkLookupTable table
table SetTableRange 0 2000
table SetValueRange 0.0 1.0
table SetSaturationRange 0.0 0.0
table SetRampToLinear
table Build
# Map the image through the lookup table
vtkImageMapToColors color
color SetLookupTable table
color SetInputConnection [reslice GetOutputPort]
# Display the image
vtkImageActor actor
actor SetInput [color GetOutput]
vtkRenderer renderer
renderer AddActor actor
vtkRenderWindow window
window AddRenderer renderer
# Set up the interaction
vtkInteractorStyleImage imageStyle
vtkRenderWindowInteractor interactor
interactor SetInteractorStyle imageStyle
window SetInteractor interactor
window Render
# Create callbacks for slicing the image
global action
set action ""
proc ButtonPressCallback {} {
global action
set action "Slicing"
}
proc ButtonReleaseCallback {} {
global action
set action ""
}
proc MouseMoveCallback {} {
set lastPos [interactor GetLastEventPosition]
set currPos [interactor GetEventPosition]
global action
if {$action == "Slicing"} {
set deltaY [expr [lindex $currPos 1] - [lindex $lastPos 1]]
[reslice GetOutput] UpdateInformation
set spacing [[reslice GetOutput] GetSpacing]
set sliceSpacing [lindex $spacing 2]
set matrix [reslice GetResliceAxes]
# move the center point that we are slicing through
set center [$matrix MultiplyPoint 0 0 [expr $sliceSpacing * $deltaY] 1]
$matrix SetElement 0 3 [lindex $center 0]
$matrix SetElement 1 3 [lindex $center 1]
$matrix SetElement 2 3 [lindex $center 2]
window Render
} else {
imageStyle OnMouseMove
}
}
imageStyle AddObserver MouseMoveEvent MouseMoveCallback
imageStyle AddObserver LeftButtonPressEvent ButtonPressCallback
imageStyle AddObserver LeftButtonReleaseEvent ButtonReleaseCallback
interactor AddObserver UserEvent {wm deiconify .vtkInteract}
interactor AddObserver ExitEvent {exit}
interactor Initialize
#
# Hide the default . widget
#
wm withdraw .
#
# You only need this line if you run this script from a Tcl shell
# (tclsh) instead of a Tk shell (wish)
#
tkwait window .
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