/usr/share/vtk/ImageProcessing/Tcl/HistogramWidget.tcl is in vtk-examples 5.8.0-14.1ubuntu3.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | # Creates a meta object which clips a region of the input, and
# draws a histogram for the data.
# Create a histogram object
proc vtkHistogramWidget {widget {width 512} {height 192}} {
set clip [::vtk::new_widget_object $widget vtkImageClip Clip]
set accumulate \
[::vtk::new_widget_object $widget vtkImageAccumulate Accumulate]
$accumulate SetInputConnection [$clip GetOutputPort]
set canvas [::vtk::new_widget_object $widget vtkImageCanvasSource2D Canvas]
$canvas SetScalarTypeToUnsignedChar
$canvas SetNumberOfScalarComponents 3
$canvas SetExtent 0 [expr $width - 1] 0 [expr $height - 1] 0 0
set viewer [::vtk::new_widget_object $widget vtkImageViewer Viewer]
$viewer SetInputConnection [$canvas GetOutputPort]
$viewer SetColorWindow 256
$viewer SetColorLevel 127
vtkTkImageViewerWidget $widget \
-width $width \
-height $height \
-iv $viewer
return $widget
}
# Set the input
proc HistogramWidgetSetInput {widget input} {
set clip [::vtk::get_widget_variable_value $widget Clip]
$clip SetInput $input
}
# Set the extent
proc HistogramWidgetSetExtent {widget x1 x2 y1 y2 z1 z2} {
set clip [::vtk::get_widget_variable_value $widget Clip]
$clip SetOutputWholeExtent $x1 $x2 $y1 $y2 $z1 $z2
}
# Render
proc HistogramWidgetRender {widget} {
# Get the size of the histogram window
set width [lindex [$widget configure -width] 4]
set height [lindex [$widget configure -height] 4]
# Setup the bins of the accumulate filter from the range of input data
set accumulate [::vtk::get_widget_variable_value $widget Accumulate]
set numBins [expr $width / 2]
set data [$accumulate GetInput]
$data Update
set inputRange [[[$data GetPointData] GetScalars] GetRange]
set origin [lindex $inputRange 0]
set spacing [expr 1.0 * ([lindex $inputRange 1] - $origin) / $numBins]
$accumulate SetComponentExtent 0 [expr $numBins - 1] 0 0 0 0
$accumulate SetComponentOrigin $origin 0.0 0.0
$accumulate SetComponentSpacing $spacing 1.0 1.0
# Initialize the canvas
set canvas [::vtk::get_widget_variable_value $widget Canvas]
$canvas SetExtent 0 [expr $width - 1] 0 [expr $height - 1] 0 0
$canvas SetDrawColor 255
$canvas SetDrawColor 172 174 241
$canvas FillBox 0 [expr $width - 1] 0 [expr $height - 1]
$canvas SetDrawColor 0
$canvas SetDrawColor 137 28 28
# Get the histogram data
set data [$accumulate GetOutput]
$data Update
# Scale the histogram max to fit the window
set histRange [[[$data GetPointData] GetScalars] GetRange]
set scale [expr 0.9 * $height / [lindex $histRange 1]]
for {set idx 0} {$idx < $numBins} {incr idx} {
set y [$data GetScalarComponentAsDouble $idx 0 0 0]
set y1 [expr $y * $scale]
set y2 [lindex [split $y1 .] 0]
set x [expr $idx * 2]
$canvas DrawSegment $x 0 $x $y2
}
$widget Render
}
# Set the bindings
proc HistogramWidgetBind {widget} {
# The usual vtkTkImageRenderWidget bindings
::vtk::bind_tk_imageviewer_widget $widget
set iren [[[$widget GetImageViewer] GetRenderWindow] GetInteractor]
# Remove the usual ConfigureEvent and ExposeEvent observers and
# use ours
$iren RemoveObservers ConfigureEvent
$iren RemoveObservers ExposeEventTag
$iren AddObserver ExposeEvent \
[list HistogramWidgetRender $widget]
# Remove the usual PickEvent and use ours for probing
set istyle [$iren GetInteractorStyle]
$istyle RemoveObservers PickEvent
$istyle AddObserver PickEvent \
[list HistogramWidgetUpdateInteraction $widget]
# Bind the left button so that it acts like the right button
$istyle RemoveObservers LeftButtonPressEvent
$istyle AddObserver LeftButtonPressEvent \
"::vtk::cb_istyleimg_right_button_press_event $istyle"
$istyle RemoveObservers LeftButtonReleaseEvent
$istyle AddObserver LeftButtonReleaseEvent \
"::vtk::cb_istyleimg_right_button_release_event $istyle"
}
# Probe the histogram
proc HistogramWidgetUpdateInteraction {widget} {
set pos [[[[$widget GetImageViewer] GetRenderWindow] GetInteractor] GetEventPosition]
set x [lindex $pos 0]
set y [lindex $pos 1]
# Compute the bin selected by the mouse
set x [expr $x / 2]
set accumulate [::vtk::get_widget_variable_value $widget Accumulate]
set origin [lindex [$accumulate GetComponentOrigin] 0]
set spacing [lindex [$accumulate GetComponentSpacing] 0]
set binMin [expr $origin + $spacing * $x]
set binMax [expr $binMin + $spacing]
# Now get the height of the histogram
set data [$accumulate GetOutput]
$data Update
# Make sure value is in extent
set max [lindex [$data GetExtent] 1]
if {$x < 0 || $x > $max} {
return
}
set y [$data GetScalarComponentAsDouble $x 0 0 0]
# Display the value
set mapper [::vtk::get_widget_variable_value $widget text1_mapper]
$mapper SetInput [format "\[%.1f, %.1f): %d" $binMin $binMax $y]
$widget Render
}
|