text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    ImagePlaneWidget.cxx
  
    Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
    All rights reserved.
    See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notice for more information.
  
  =========================================================================*/
  #include "vtkSmartPointer.h"
  
  #include "vtkActor.h"
  #include "vtkCamera.h"
  #include "vtkCellPicker.h"
  #include "vtkCommand.h"
  #include "vtkImageActor.h"
  #include "vtkImageData.h"
  #include "vtkImageMapToColors.h"
  #include "vtkImageMapper3D.h"
  #include "vtkImagePlaneWidget.h"
  #include "vtkImageReader.h"
  #include "vtkInteractorEventRecorder.h"
  #include "vtkLookupTable.h"
  #include "vtkOutlineFilter.h"
  #include "vtkPolyDataMapper.h"
  #include "vtkProperty.h"
  #include "vtkRenderWindow.h"
  #include "vtkRenderWindowInteractor.h"
  #include "vtkRenderer.h"
  #include "vtkVolume16Reader.h"
  
  #include "vtkTestUtilities.h"
  
  static char IPWeventLog[] = "# StreamVersion 1\n"
                              "CharEvent 179 195 0 0 98 1 i\n"
                              "MiddleButtonPressEvent 179 195 0 0 0 0 i\n"
                              "MouseMoveEvent 179 190 0 0 0 0 i\n"
                              "MouseMoveEvent 179 185 0 0 0 0 i\n"
                              "MouseMoveEvent 179 180 0 0 0 0 i\n"
                              "MouseMoveEvent 179 175 0 0 0 0 i\n"
                              "MouseMoveEvent 179 170 0 0 0 0 i\n"
                              "MouseMoveEvent 179 165 0 0 0 0 i\n"
                              "MouseMoveEvent 179 160 0 0 0 0 i\n"
                              "MouseMoveEvent 179 155 0 0 0 0 i\n"
                              "MouseMoveEvent 179 150 0 0 0 0 i\n"
                              "MouseMoveEvent 179 145 0 0 0 0 i\n"
                              "MouseMoveEvent 179 140 0 0 0 0 i\n"
                              "MouseMoveEvent 179 135 0 0 0 0 i\n"
                              "MiddleButtonReleaseEvent 179 135 0 0 0 0 i\n"
                              "RightButtonPressEvent 179 135 0 0 0 0 i\n"
                              "MouseMoveEvent 180 135 0 0 0 0 i\n"
                              "MouseMoveEvent 181 136 0 0 0 0 i\n"
                              "MouseMoveEvent 181 137 0 0 0 0 i\n"
                              "MouseMoveEvent 181 138 0 0 0 0 i\n"
                              "MouseMoveEvent 181 139 0 0 0 0 i\n"
                              "MouseMoveEvent 181 140 0 0 0 0 i\n"
                              "MouseMoveEvent 180 140 0 0 0 0 i\n"
                              "MouseMoveEvent 175 135 0 0 0 0 i\n"
                              "MouseMoveEvent 170 130 0 0 0 0 i\n"
                              "MouseMoveEvent 165 130 0 0 0 0 i\n"
                              "MouseMoveEvent 160 130 0 0 0 0 i\n"
                              "MouseMoveEvent 155 125 0 0 0 0 i\n"
                              "MouseMoveEvent 150 120 0 0 0 0 i\n"
                              "MouseMoveEvent 145 115 0 0 0 0 i\n"
                              "MouseMoveEvent 140 110 0 0 0 0 i\n"
                              "RightButtonReleaseEvent 140 110 0 0 0 0 i\n"
                              "MouseMoveEvent 135 120 0 0 0 0 i\n"
                              "MouseMoveEvent 130 135 0 0 0 0 i\n"
                              "MouseMoveEvent 125 170 0 0 0 0 i\n"
                              "MouseMoveEvent 120 180 0 0 0 0 i\n"
                              "MouseMoveEvent 115 190 0 0 0 0 i\n"
                              "MouseMoveEvent 110 200 0 0 0 0 i\n"
                              "MouseMoveEvent 106 218 0 0 0 0 i\n"
                              "LeftButtonPressEvent 106 218 0 0 0 0 i\n"
                              "MouseMoveEvent 107 219 0 0 0 0 i\n"
                              "MouseMoveEvent 110 218 0 0 0 0 i\n"
                              "MouseMoveEvent 114 216 0 0 0 0 i\n"
                              "MouseMoveEvent 118 214 0 0 0 0 i\n"
                              "MouseMoveEvent 123 213 0 0 0 0 i\n"
                              "MouseMoveEvent 128 212 0 0 0 0 i\n"
                              "MouseMoveEvent 132 210 0 0 0 0 i\n"
                              "MouseMoveEvent 138 207 0 0 0 0 i\n"
                              "MouseMoveEvent 144 205 0 0 0 0 i\n"
                              "MouseMoveEvent 150 203 0 0 0 0 i\n"
                              "MouseMoveEvent 157 201 0 0 0 0 i\n"
                              "MouseMoveEvent 164 200 0 0 0 0 i\n"
                              "MouseMoveEvent 168 198 0 0 0 0 i\n"
                              "MouseMoveEvent 176 196 0 0 0 0 i\n"
                              "MouseMoveEvent 183 194 0 0 0 0 i\n"
                              "MouseMoveEvent 190 192 0 0 0 0 i\n"
                              "MouseMoveEvent 197 190 0 0 0 0 i\n"
                              "MouseMoveEvent 199 189 0 0 0 0 i\n"
                              "MouseMoveEvent 204 189 0 0 0 0 i\n"
                              "MouseMoveEvent 206 189 0 0 0 0 i\n"
                              "MouseMoveEvent 209 188 0 0 0 0 i\n"
                              "MouseMoveEvent 211 187 0 0 0 0 i\n"
                              "LeftButtonReleaseEvent 211 187 0 0 0 0 i\n"
                              "MouseMoveEvent 259 183 0 0 0 0 i\n"
                              "KeyPressEvent 259 183 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 259 183 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 261 183 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 263 182 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 266 181 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 268 180 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 270 179 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 273 178 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 276 177 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 279 176 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 282 175 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 287 174 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 286 173 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 284 173 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 281 174 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 277 175 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 274 176 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 269 177 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 267 177 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 267 177 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 267 177 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 240 229 0 0 0 0 Control_L\n"
                              "KeyPressEvent 240 229 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 240 229 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 240 230 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 240 235 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 240 240 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 240 245 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 240 250 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 241 255 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 260 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 265 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 260 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 255 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 250 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 245 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 242 240 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 241 238 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 241 238 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 241 238 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 103 250 0 0 0 0 Control_L\n"
                              "KeyPressEvent 103 250 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 103 250 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 100 250 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 97 251 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 94 251 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 91 252 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 90 253 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 85 253 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 80 253 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 85 253 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 85 253 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 85 253 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 228 88 0 0 0 0 Control_L\n"
                              "KeyPressEvent 228 88 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 228 88 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 228 86 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 227 83 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 226 83 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 225 80 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 225 75 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 224 70 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 223 70 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 223 75 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 222 80 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 222 85 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 222 90 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 222 93 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 222 93 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 260 76 0 0 0 0 Control_L\n"
                              "KeyPressEvent 260 76 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 260 76 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 260 75 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 261 72 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 262 69 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 263 67 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 263 65 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 264 63 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 265 61 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 266 60 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 266 55 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 267 53 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 267 53 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 267 53 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 278 226 0 0 0 0 Control_L\n"
                              "KeyPressEvent 278 226 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 278 226 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 278 227 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 278 230 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 280 232 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 282 234 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 284 237 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 286 239 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 287 242 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 290 245 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 292 247 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 293 249 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 283 249 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 293 249 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 93 286 0 0 0 0 Control_L\n"
                              "KeyPressEvent 93 286 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 93 286 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 92 288 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 90 290 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 87 292 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 84 295 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 82 297 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 80 298 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 78 300 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 78 300 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 78 300 0 0 0 0 Control_L\n"
                              "MouseMoveEvent 198 194 0 0 0 0 Control_L\n"
                              "KeyPressEvent 198 194 -128 0 0 1 Control_L\n"
                              "MiddleButtonPressEvent 198 194 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 196 194 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 191 192 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 185 189 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 182 187 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 180 186 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 178 185 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 177 180 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 178 179 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 179 178 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 179 177 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 182 176 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 187 175 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 190 177 8 0 0 0 Control_L\n"
                              "MouseMoveEvent 190 179 8 0 0 0 Control_L\n"
                              "KeyReleaseEvent 190 179 0 0 0 1 Control_L\n"
                              "MiddleButtonReleaseEvent 190 179 0 0 0 0 Control_L\n"
                              "KeyPressEvent 190 179 0 -128 0 1 Shift_L\n"
                              "MiddleButtonPressEvent 190 179 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 190 180 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 190 185 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 190 190 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 191 194 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 192 200 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 192 206 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 193 213 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 193 209 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 193 206 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 193 200 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 193 196 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 193 190 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 194 185 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 196 180 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 197 175 0 4 0 0 Shift_L\n"
                              "MouseMoveEvent 198 172 0 4 0 0 Shift_L\n"
                              "KeyReleaseEvent 198 172 0 0 0 1 Shift_L\n"
                              "MiddleButtonReleaseEvent 198 172 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 267 172 0 0 0 0 Shift_L\n"
                              "MiddleButtonPressEvent 267 172 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 264 171 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 260 171 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 255 171 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 250 171 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 245 172 0 0 0 0 Shift_L\n"
                              "MiddleButtonReleaseEvent 245 172 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 203 65 0 0 0 0 Shift_L\n"
                              "MiddleButtonPressEvent 203 65 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 200 65 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 195 66 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 193 67 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 190 68 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 184 71 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 180 73 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 178 74 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 176 75 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 175 76 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 174 77 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 173 78 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 172 79 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 170 80 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 169 81 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 168 82 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 167 83 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 166 84 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 164 84 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 163 85 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 162 86 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 160 86 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 158 87 0 0 0 0 Shift_L\n"
                              "MiddleButtonReleaseEvent 158 87 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 95 251 0 0 0 0 Shift_L\n"
                              "MiddleButtonPressEvent 95 251 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 90 251 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 85 252 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 80 252 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 75 252 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 70 252 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 65 251 0 0 0 0 Shift_L\n"
                              "MiddleButtonReleaseEvent 65 251 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 133 281 0 0 0 0 Shift_L\n"
                              "MiddleButtonPressEvent 133 281 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 130 280 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 125 277 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 120 274 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 115 270 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 113 267 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 110 265 0 0 0 0 Shift_L\n"
                              "MiddleButtonReleaseEvent 110 265 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 99 286 0 0 0 0 Shift_L\n"
                              "MiddleButtonPressEvent 99 286 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 100 287 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 105 289 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 110 290 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 115 290 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 120 290 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 125 285 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 129 281 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 130 279 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 128 281 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 126 282 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 123 283 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 120 284 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 115 285 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 110 286 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 106 286 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 102 286 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 99 285 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 95 283 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 92 281 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 89 279 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 88 276 0 0 0 0 Shift_L\n"
                              "MouseMoveEvent 86 274 0 0 0 0 Shift_L\n"
                              "MiddleButtonReleaseEvent 86 274 0 0 0 0 Shift_L\n";
  
  //------------------------------------------------------------------------------
  class vtkWidgetWindowLevelCallback : public vtkCommand
  {
  public:
    static vtkWidgetWindowLevelCallback* New() { return new vtkWidgetWindowLevelCallback; }
  
    void Execute(vtkObject* caller, unsigned long vtkNotUsed(event), void* callData) override
    {
      vtkImagePlaneWidget* self = reinterpret_cast<vtkImagePlaneWidget*>(caller);
      if (!self)
        return;
  
      double* wl = static_cast<double*>(callData);
  
      if (self == this->WidgetX)
      {
        this->WidgetY->SetWindowLevel(wl[0], wl[1], 1);
        this->WidgetZ->SetWindowLevel(wl[0], wl[1], 1);
      }
      else if (self == this->WidgetY)
      {
        this->WidgetX->SetWindowLevel(wl[0], wl[1], 1);
        this->WidgetZ->SetWindowLevel(wl[0], wl[1], 1);
      }
      else if (self == this->WidgetZ)
      {
        this->WidgetX->SetWindowLevel(wl[0], wl[1], 1);
        this->WidgetY->SetWindowLevel(wl[0], wl[1], 1);
      }
    }
  
    vtkWidgetWindowLevelCallback()
      : WidgetX(nullptr)
      , WidgetY(nullptr)
      , WidgetZ(nullptr)
    {
    }
  
    vtkImagePlaneWidget* WidgetX;
    vtkImagePlaneWidget* WidgetY;
    vtkImagePlaneWidget* WidgetZ;
  };
  
  int ImagePlaneWidget(int argc, char* argv[])
  {
    char* fname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/headsq/quarter");
  
    vtkSmartPointer<vtkVolume16Reader> v16 = vtkSmartPointer<vtkVolume16Reader>::New();
    v16->SetDataDimensions(64, 64);
    v16->SetDataByteOrderToLittleEndian();
    v16->SetImageRange(1, 93);
    v16->SetDataSpacing(3.2, 3.2, 1.5);
    v16->SetFilePrefix(fname);
    v16->SetDataMask(0x7fff);
    v16->Update();
  
    delete[] fname;
  
    vtkSmartPointer<vtkOutlineFilter> outline = vtkSmartPointer<vtkOutlineFilter>::New();
    outline->SetInputConnection(v16->GetOutputPort());
  
    vtkSmartPointer<vtkPolyDataMapper> outlineMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    outlineMapper->SetInputConnection(outline->GetOutputPort());
  
    vtkSmartPointer<vtkActor> outlineActor = vtkSmartPointer<vtkActor>::New();
    outlineActor->SetMapper(outlineMapper);
  
    vtkSmartPointer<vtkRenderer> ren1 = vtkSmartPointer<vtkRenderer>::New();
    vtkSmartPointer<vtkRenderer> ren2 = vtkSmartPointer<vtkRenderer>::New();
  
    vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New();
    renWin->SetMultiSamples(0);
    renWin->AddRenderer(ren2);
    renWin->AddRenderer(ren1);
  
    vtkSmartPointer<vtkRenderWindowInteractor> iren =
      vtkSmartPointer<vtkRenderWindowInteractor>::New();
    iren->SetRenderWindow(renWin);
  
    vtkSmartPointer<vtkCellPicker> picker = vtkSmartPointer<vtkCellPicker>::New();
    picker->SetTolerance(0.005);
  
    vtkSmartPointer<vtkProperty> ipwProp = vtkSmartPointer<vtkProperty>::New();
    // assign default props to the ipw's texture plane actor
  
    vtkSmartPointer<vtkImagePlaneWidget> planeWidgetX = vtkSmartPointer<vtkImagePlaneWidget>::New();
    planeWidgetX->SetInteractor(iren);
    planeWidgetX->SetKeyPressActivationValue('x');
    planeWidgetX->SetPicker(picker);
    planeWidgetX->RestrictPlaneToVolumeOn();
    planeWidgetX->GetPlaneProperty()->SetColor(1, 0, 0);
    planeWidgetX->SetTexturePlaneProperty(ipwProp);
    planeWidgetX->TextureInterpolateOff();
    planeWidgetX->SetResliceInterpolateToNearestNeighbour();
    planeWidgetX->SetInputConnection(v16->GetOutputPort());
    planeWidgetX->SetPlaneOrientationToXAxes();
    planeWidgetX->SetSliceIndex(32);
    planeWidgetX->DisplayTextOn();
    planeWidgetX->On();
    planeWidgetX->InteractionOff();
    planeWidgetX->InteractionOn();
  
    vtkSmartPointer<vtkImagePlaneWidget> planeWidgetY = vtkSmartPointer<vtkImagePlaneWidget>::New();
    planeWidgetY->SetInteractor(iren);
    planeWidgetY->SetKeyPressActivationValue('y');
    planeWidgetY->SetPicker(picker);
    planeWidgetY->GetPlaneProperty()->SetColor(1, 1, 0);
    planeWidgetY->SetTexturePlaneProperty(ipwProp);
    planeWidgetY->TextureInterpolateOn();
    planeWidgetY->SetResliceInterpolateToLinear();
    planeWidgetY->SetInputConnection(v16->GetOutputPort());
    planeWidgetY->SetPlaneOrientationToYAxes();
    planeWidgetY->SetSlicePosition(102.4);
    planeWidgetY->SetLookupTable(planeWidgetX->GetLookupTable());
    planeWidgetY->DisplayTextOff();
    planeWidgetY->UpdatePlacement();
    planeWidgetY->On();
  
    vtkSmartPointer<vtkImagePlaneWidget> planeWidgetZ = vtkSmartPointer<vtkImagePlaneWidget>::New();
    planeWidgetZ->SetInteractor(iren);
    planeWidgetZ->SetKeyPressActivationValue('z');
    planeWidgetZ->SetPicker(picker);
    planeWidgetZ->GetPlaneProperty()->SetColor(0, 0, 1);
    planeWidgetZ->SetTexturePlaneProperty(ipwProp);
    planeWidgetZ->TextureInterpolateOn();
    planeWidgetZ->SetResliceInterpolateToCubic();
    planeWidgetZ->SetInputConnection(v16->GetOutputPort());
    planeWidgetZ->SetPlaneOrientationToZAxes();
    planeWidgetZ->SetSliceIndex(25);
    planeWidgetZ->SetLookupTable(planeWidgetX->GetLookupTable());
    planeWidgetZ->DisplayTextOn();
    planeWidgetZ->On();
  
    vtkSmartPointer<vtkWidgetWindowLevelCallback> cbk =
      vtkSmartPointer<vtkWidgetWindowLevelCallback>::New();
    cbk->WidgetX = planeWidgetX;
    cbk->WidgetY = planeWidgetY;
    cbk->WidgetZ = planeWidgetZ;
    planeWidgetX->AddObserver(vtkCommand::EndWindowLevelEvent, cbk);
    planeWidgetY->AddObserver(vtkCommand::EndWindowLevelEvent, cbk);
    planeWidgetZ->AddObserver(vtkCommand::EndWindowLevelEvent, cbk);
  
    double wl[2];
    planeWidgetZ->GetWindowLevel(wl);
  
    // Add a 2D image to test the GetReslice method
    //
    vtkSmartPointer<vtkImageMapToColors> colorMap = vtkSmartPointer<vtkImageMapToColors>::New();
    colorMap->PassAlphaToOutputOff();
    colorMap->SetActiveComponent(0);
    colorMap->SetOutputFormatToLuminance();
    colorMap->SetInputData(planeWidgetZ->GetResliceOutput());
    colorMap->SetLookupTable(planeWidgetX->GetLookupTable());
  
    vtkSmartPointer<vtkImageActor> imageActor = vtkSmartPointer<vtkImageActor>::New();
    imageActor->PickableOff();
    imageActor->GetMapper()->SetInputConnection(colorMap->GetOutputPort());
  
    // Add the actors
    //
    ren1->AddActor(outlineActor);
    ren2->AddActor(imageActor);
  
    ren1->SetBackground(0.1, 0.1, 0.2);
    ren2->SetBackground(0.2, 0.1, 0.2);
  
    renWin->SetSize(600, 350);
  
    ren1->SetViewport(0, 0, 0.58333, 1);
    ren2->SetViewport(0.58333, 0, 1, 1);
  
    // Set the actors' positions
    //
    renWin->Render();
    iren->SetEventPosition(175, 175);
    iren->SetKeyCode('r');
    iren->InvokeEvent(vtkCommand::CharEvent, nullptr);
    iren->SetEventPosition(475, 175);
    iren->SetKeyCode('r');
    iren->InvokeEvent(vtkCommand::CharEvent, nullptr);
    renWin->Render();
  
    ren1->GetActiveCamera()->Elevation(110);
    ren1->GetActiveCamera()->SetViewUp(0, 0, -1);
    ren1->GetActiveCamera()->Azimuth(45);
    ren1->GetActiveCamera()->Dolly(1.15);
    ren1->ResetCameraClippingRange();
  
    // Playback recorded events
    //
    vtkSmartPointer<vtkInteractorEventRecorder> recorder =
      vtkSmartPointer<vtkInteractorEventRecorder>::New();
    recorder->SetInteractor(iren);
    recorder->ReadFromInputStringOn();
    recorder->SetInputString(IPWeventLog);
  
    // Test SetKeyPressActivationValue for one of the widgets
    //
    iren->SetKeyCode('z');
    iren->InvokeEvent(vtkCommand::CharEvent, nullptr);
    iren->SetKeyCode('z');
    iren->InvokeEvent(vtkCommand::CharEvent, nullptr);
  
    recorder->Play();
  
    // Remove the observers so we can go interactive. Without this the "-I"
    // testing option fails.
    recorder->Off();
  
    iren->Initialize();
    iren->Start();
  
    return EXIT_SUCCESS;
  }
  