vv/vvSlicerManagerCommand.cxx

   1 /*=========================================================================
   2   Program:   vv                     http://www.creatis.insa-lyon.fr/rio/vv
   3
   4   Authors belong to:
   5   - University of LYON              http://www.universite-lyon.fr/
   6   - Léon Bérard cancer center       http://www.centreleonberard.fr
   7   - CREATIS CNRS laboratory         http://www.creatis.insa-lyon.fr
   8
   9   This software is distributed WITHOUT ANY WARRANTY; without even
  10   the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  11   PURPOSE.  See the copyright notices for more information.
  12
  13   It is distributed under dual licence
  14
  15   - BSD        See included LICENSE.txt file
  16   - CeCILL-B   http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html
  17 ===========================================================================**/
  18 #include "vvSlicerManagerCommand.h"
  19 #include "vvSlicerManager.h"
  20
  21 #include <vtkTextProperty.h>
  22 #include <vtkRenderer.h>
  23 #include <vtkImageActor.h>
  24 #include <vtkRenderWindowInteractor.h>
  25 #include <vtkPropPicker.h>
  26 #include <vtkCamera.h>
  27 #include <vtkImageMapToWindowLevelColors.h>
  28 #include <vtkLookupTable.h>
  29 #include <vtkMath.h>
  30 #include <vtkAbstractPropPicker.h>
  31 #include <vtkAssemblyPath.h>
  32 #include <vtkCornerAnnotation.h>
  33 #include <vtkRenderWindow.h>
  34 #include <vvImage.h>
  35 #include <vtkImageReslice.h>
  36 #include "vvSlicer.h"
  37 #include "vvInteractorStyleNavigator.h"
  38 #include "vtkTransform.h"
  39
  40 #include <cmath>
  41 //------------------------------------------------------------------------------
  42 vvSlicerManagerCommand::vvSlicerManagerCommand()
  43 {
  44   mStartSlicer = -1;
  45   mSlicerNumber=-1;
  46 }
  47 //------------------------------------------------------------------------------
  48
  49
  50 //------------------------------------------------------------------------------
  51 //return the num of the current slicer if visible (-1 else)
  52 int vvSlicerManagerCommand::FindSlicerNumber(vtkRenderWindow* renwin)
  53 {
  54   int rvalue;
  55   if (renwin != SM->GetSlicer(mSlicerNumber)->GetRenderWindow() ||
  56       !SM->GetSlicer(mSlicerNumber)->GetRenderer()->GetDraw())
  57     rvalue = -1;
  58   else rvalue = mSlicerNumber;
  59   //std::cerr << this << ":" << mSlicerNumber << ": " << rvalue << endl;
  60   return rvalue;
  61 }
  62 //------------------------------------------------------------------------------
  63
  64
  65 //------------------------------------------------------------------------------
  66 void vvSlicerManagerCommand::Execute(vtkObject *caller,
  67                                      unsigned long event,
  68                                      void *vtkNotUsed(callData))
  69 {
  70   //KeyPress event
  71   vvInteractorStyleNavigator *isi =
  72     dynamic_cast<vvInteractorStyleNavigator *>(caller);
  73   if (isi) {
  74     double x = isi->GetInteractor()->GetEventPosition()[0];
  75     double y = isi->GetInteractor()->GetEventPosition()[1];
  76     double z;
  77
  78     int VisibleInWindow = this->FindSlicerNumber(isi->GetInteractor()->GetRenderWindow());
  79     vtkRenderer* renderer=NULL;
  80     if (VisibleInWindow>-1)
  81       renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
  82     newLandmark = false;
  83
  84
  85
  86     if (event == vtkCommand::StartPickEvent && VisibleInWindow == -1) {
  87       for (int i = 0; i < this->SM->GetNumberOfSlicers(); i++) {
  88         if (this->SM->GetSlicer(i)->GetCursorVisibility() && !this->SM->IsLinked()) {
  89           this->SM->GetSlicer(i)->SetCursorVisibility(0);
  90           this->SM->GetSlicer(i)->SetCornerAnnotationVisibility(0);
  91           this->SM->GetSlicer(i)->Render();
  92         }
  93       }
  94     }
  95     if ( VisibleInWindow > -1 ) {
  96       if (event == vtkCommand::KeyPressEvent) {
  97         std::string KeyPress = isi->GetInteractor()->GetKeySym();
  98         bool bCtrlKey = isi->GetInteractor()->GetControlKey();
  99         if (KeyPress == "Tab") {
 100           if(isi->GetInteractor()->GetShiftKey())
 101             this->SM->PrevImage(VisibleInWindow);
 102           else
 103             this->SM->NextImage(VisibleInWindow);
 104           return;
 105         }
 106         if (KeyPress == "f" || KeyPress == "F") {
 107           FlyToPosition(isi->GetInteractor(),this->SM->GetSlicer(VisibleInWindow));
 108           return;
 109         }
 110         if (KeyPress == "w") {
 111           this->SM->SetLocalColorWindowing(VisibleInWindow, bCtrlKey);
 112           return;
 113         }
 114         if (KeyPress == "0") {
 115           this->SM->SetPreset(WL_AUTO);
 116           this->SM->UpdateWindowLevel();
 117           return;
 118         }
 119         if (KeyPress == "1") {
 120           this->SM->SetPreset(WL_HOUNSFIELD);
 121           this->SM->UpdateWindowLevel();
 122           return;
 123         }
 124         if (KeyPress == "2") {
 125           this->SM->SetPreset(WL_SOFTTISSUE);
 126           this->SM->UpdateWindowLevel();
 127
 128           return;
 129         }
 130         if (KeyPress == "3") {
 131           this->SM->SetPreset(WL_LUNGS);
 132           this->SM->UpdateWindowLevel();
 133           return;
 134         }
 135         if (KeyPress == "4") {
 136           this->SM->SetPreset(WL_BONES);
 137           this->SM->UpdateWindowLevel();
 138           return;
 139         }
 140         if (KeyPress == "5") {
 141           this->SM->SetPreset(WL_HEAD);
 142           this->SM->UpdateWindowLevel();
 143           return;
 144         }
 145         if (KeyPress == "6") {
 146           this->SM->SetColorMap(0);
 147           this->SM->UpdateWindowLevel();
 148           return;
 149         }
 150         if (KeyPress == "7") {
 151           this->SM->SetColorMap(1);
 152           this->SM->UpdateWindowLevel();
 153           return;
 154         }
 155         if (KeyPress == "8") {
 156           this->SM->SetColorMap(2);
 157           this->SM->UpdateWindowLevel();
 158           return;
 159         }
 160         if (KeyPress == "9") {
 161           this->SM->SetColorMap(3);
 162           this->SM->UpdateWindowLevel();
 163           return;
 164         }
 165         if (KeyPress == "equal") { //keycodes are in vtkWin32RenderWindowInteractor
 166           this->SM->SetPreset(WL_VENTILATION);
 167           //this->SM->SetColorMap(1);
 168           this->SM->UpdateWindowLevel();
 169           return;
 170         }
 171         if (KeyPress == "minus") {
 172           this->SM->SetColorWindow(-this->SM->GetColorWindow());
 173           this->SM->SetColorMap(-1);
 174           this->SM->UpdateWindowLevel();
 175           return;
 176         }
 177         if (KeyPress == "c") {
 178           this->SM->ToggleContourSuperposition();
 179           this->SM->Render();
 180           return;
 181         }
 182         if (KeyPress == "l") {
 183           this->SM->ToggleInterpolation();
 184           this->SM->Render();
 185           return;
 186         }
 187         if (KeyPress == "h") {
 188           this->SM->SetCursorAndCornerAnnotationVisibility(0);
 189           this->SM->Render();
 190           return;
 191         }
 192         if (KeyPress == "x") {
 193           for(int i=0; i<SM->GetNumberOfSlicers(); i++) {
 194             SM->RemoveActor("overlay",0);
 195             SM->SetColorMap(0);
 196             SM->Render();
 197           }
 198           return;
 199         }
 200         if (KeyPress == "u") {
 201           this->SM->Reload();
 202           this->SM->Render();
 203           return;
 204         }
 205         if (KeyPress == "r" || KeyPress=="R") {
 206           this->SM->GetSlicer(VisibleInWindow)->ResetCamera();
 207           this->SM->GetSlicer(VisibleInWindow)->Render();
 208           this->SM->UpdateLinkedNavigation( this->SM->GetSlicer(VisibleInWindow) );
 209           return;
 210         }
 211         if (KeyPress == "g") {
 212           if(bCtrlKey)
 213             this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(0,0,0,0);
 214           else {
 215             double* cursorPos = this->SM->GetSlicer(VisibleInWindow)->GetCursorPosition();
 216             this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(
 217               cursorPos[0],cursorPos[1],cursorPos[2],cursorPos[3]);
 218           }
 219           this->SM->UpdateViews(1,VisibleInWindow);
 220           this->SM->UpdateLinked(VisibleInWindow);
 221           return;
 222         }
 223         if (KeyPress == "F5") {
 224           this->SM->GetSlicer(VisibleInWindow)->FlipHorizontalView();
 225           this->SM->GetSlicer(VisibleInWindow)->Render();
 226           return;
 227         }
 228         if (KeyPress == "F6") {
 229           this->SM->GetSlicer(VisibleInWindow)->FlipVerticalView();
 230           this->SM->GetSlicer(VisibleInWindow)->Render();
 231           return;
 232         }
 233         if (KeyPress == "Up") {
 234           this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()+1);
 235           this->SM->UpdateSlice(VisibleInWindow);
 236         }
 237         if (KeyPress == "Down") {
 238           this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()-1);
 239           this->SM->UpdateSlice(VisibleInWindow);
 240         }
 241         if (KeyPress == "space") {
 242           newLandmark = true;
 243         }
 244         if (KeyPress == "Left")
 245           this->SM->SetPreviousTSlice(VisibleInWindow);
 246         if (KeyPress == "Right")
 247           this->SM->SetNextTSlice(VisibleInWindow);
 248
 249         if (KeyPress == "F2") {
 250           this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Sagital\n<slice>");
 251           //this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(0);
 252           this->SM->SetSliceOrientation(VisibleInWindow, 0);
 253           this->SM->UpdateSliceRange(VisibleInWindow);
 254         }
 255         if (KeyPress == "F3") {
 256           this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Coronal\n<slice>");
 257           //this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(1);
 258           this->SM->SetSliceOrientation(VisibleInWindow, 1);
 259           this->SM->UpdateSliceRange(VisibleInWindow);
 260         }
 261         if (KeyPress == "F4") {
 262           this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Axial\n<slice>");
 263           //this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(2);
 264           this->SM->SetSliceOrientation(VisibleInWindow, 2);
 265           this->SM->UpdateSliceRange(VisibleInWindow);
 266         }
 267
 268         this->SM->EmitKeyPressed(KeyPress);
 269       }
 270
 271       //All type of mouse events
 272       if (event == vtkCommand::LeaveEvent) {
 273         this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(-VTK_DOUBLE_MAX,-VTK_DOUBLE_MAX,
 274             -VTK_DOUBLE_MAX,this->SM->GetSlicer(VisibleInWindow)->GetMaxCurrentTSlice());
 275         this->SM->GetSlicer(VisibleInWindow)->Render();
 276         return;
 277       }
 278
 279       // Mouse release HERE
 280       if (event == vtkCommand::EndPickEvent) {
 281         //            DD(VisibleInWindow);
 282         if (VisibleInWindow > -1)
 283           this->SM->LeftButtonReleaseEvent(VisibleInWindow);
 284         return; // no return !!!! ???
 285       }
 286
 287       if (event == vtkCommand::StartWindowLevelEvent) {
 288         mStartSlicer = -1;
 289         this->InitialWindow = this->SM->GetColorWindow();
 290         this->InitialLevel = this->SM->GetColorLevel();
 291
 292         if (VisibleInWindow > -1) {
 293           mStartSlicer = VisibleInWindow;
 294         }
 295         return;
 296       }
 297
 298       if (event == vtkCommand::EndWindowLevelEvent) {
 299         mStartSlicer = -1;
 300       }
 301
 302       if (event == vtkCommand::EndInteractionEvent) {
 303         this->SM->Picked();
 304         this->SM->UpdateLinkedNavigation(this->SM->GetSlicer(VisibleInWindow),true);
 305         return;
 306       }
 307     }
 308     if (VisibleInWindow > -1) {
 309       this->SM->Activated();
 310       this->SM->GetSlicer(VisibleInWindow)->SetCornerAnnotationVisibility(1);
 311
 312       if (event == vtkCommand::MouseWheelForwardEvent && !isi->GetInteractor()->GetControlKey()) {
 313         this->SM->Picked();
 314         this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()+1);
 315         this->SM->UpdateSlice(VisibleInWindow);
 316       } else if (event == vtkCommand::MouseWheelForwardEvent && isi->GetInteractor()->GetControlKey()) {
 317         double factor = 2;
 318         this->Dolly(pow((double)1.1, factor),isi->GetInteractor());
 319         Execute(caller, vtkCommand::EndInteractionEvent, NULL);
 320       } else if (event == vtkCommand::MouseWheelBackwardEvent && !isi->GetInteractor()->GetControlKey()) {
 321         this->SM->Picked();
 322         this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()-1);
 323         this->SM->UpdateSlice(VisibleInWindow);
 324       } else if (event == vtkCommand::MouseWheelBackwardEvent && isi->GetInteractor()->GetControlKey()) {
 325         double factor = -2;
 326         this->Dolly(pow((double)1.1, factor),isi->GetInteractor());
 327         Execute(caller, vtkCommand::EndInteractionEvent, NULL);
 328       }
 329       double xWorld=0;
 330       double yWorld=0;
 331       double zWorld=0;
 332
 333       //Move into World Coordinate
 334       renderer->DisplayToNormalizedDisplay(x,y);
 335       renderer->NormalizedDisplayToViewport(x,y);
 336       renderer->ViewportToNormalizedViewport(x,y);
 337       renderer->NormalizedViewportToView(x,y,z);
 338       renderer->ViewToWorld(x,y,z);
 339       switch (this->SM->GetSlicer(VisibleInWindow)->GetSliceOrientation()) {
 340       case vtkImageViewer2::SLICE_ORIENTATION_XY:
 341         xWorld = x;
 342         yWorld = y;
 343         zWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 344                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[2] +
 345                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[2];
 346         break;
 347
 348       case vtkImageViewer2::SLICE_ORIENTATION_XZ:
 349         xWorld = x;
 350         yWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 351                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[1] +
 352                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[1];
 353         zWorld = z;
 354         break;
 355
 356       case vtkImageViewer2::SLICE_ORIENTATION_YZ:
 357         xWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 358                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[0] +
 359                  this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[0];
 360         yWorld = y;
 361         zWorld = z;
 362         break;
 363       }
 364
 365       // <<<<<<< HEAD
 366       //       this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(xWorld,yWorld,zWorld,
 367       //                           this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 368       //       // We propagate the mouse position
 369       //       this->SM->EmitMousePositionUpdated(VisibleInWindow);
 370       // =======
 371       double p[3]; p[0] = xWorld; p[1] = yWorld; p[2] = zWorld;
 372       double pt[3];
 373       this->SM->GetSlicer(VisibleInWindow)->GetSlicingTransform()->TransformPoint(p, pt);
 374
 375       this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(pt[0],pt[1],pt[2],
 376           this->SM->GetSlicer(VisibleInWindow)->GetMaxCurrentTSlice());
 377
 378       // We propagate the mouse position
 379       this->SM->EmitMousePositionUpdated(VisibleInWindow);
 380
 381       //>>>>>>> 921642d767beba2442dacc8fdb40dc36396e1b7d
 382
 383       if (newLandmark) {
 384         this->SM->AddLandmark(xWorld,yWorld,zWorld,
 385                               this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 386         this->SM->GetSlicer(VisibleInWindow)->UpdateLandmarks();
 387         this->SM->Render();
 388       }
 389       if (event == vtkCommand::PickEvent || event == vtkCommand::StartPickEvent) {
 390         this->SM->Picked();
 391         this->SM->UpdateViews(1,VisibleInWindow);
 392         this->SM->UpdateLinked(VisibleInWindow);
 393         this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 394       } else {
 395         this->SM->GetSlicer(VisibleInWindow)->Render();
 396       }
 397       //this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(-VTK_DOUBLE_MAX,-VTK_DOUBLE_MAX,
 398       //-VTK_DOUBLE_MAX,this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 399       //this->SM->GetSlicer(VisibleInWindow)->Render();
 400     }
 401
 402     if (event == vtkCommand::WindowLevelEvent && mStartSlicer > -1) {
 403       this->SM->GetSlicer(mStartSlicer)->SetCornerAnnotationVisibility(1);
 404       // Adjust the window level here
 405       int *size = isi->GetInteractor()->GetRenderWindow()->GetSize();
 406       double window = this->InitialWindow;
 407       double level = this->InitialLevel;
 408       double range[2];
 409       this->SM->GetImage()->GetScalarRange(range);
 410
 411       // Compute normalized delta
 412       double dx = static_cast<double>(isi->GetWindowLevelCurrentPosition()[0] -
 413                                       isi->GetWindowLevelStartPosition()[0]) / size[0];
 414       double dy = static_cast<double>(isi->GetWindowLevelStartPosition()[1] -
 415                                       isi->GetWindowLevelCurrentPosition()[1]) / size[1];
 416       //Window is exponential in nature, use exponential to avoid falling into negative numbers
 417       dx = std::exp(1.0 * (dx*fabs(dx) + dx)) ; //Quadratic behavior for more reactive interface
 418       dy = 0.15 * (dy*fabs(dy) + dy) * (range[1]-range[0]);//Quadratic behavior for more reactive interface
 419
 420       this->SM->SetColorWindow(window*dx);
 421       this->SM->SetColorLevel(level-dy);
 422       this->SM->SetPreset(WL_USER);
 423       this->SM->Render();
 424       this->SM->UpdateWindowLevel();
 425       return;
 426     }
 427   }
 428 }
 429 //------------------------------------------------------------------------------
 430
 431
 432 //------------------------------------------------------------------------------
 433 void vvSlicerManagerCommand::Dolly(double factor, vtkRenderWindowInteractor *interactor)
 434 {
 435   int VisibleInWindow = this->FindSlicerNumber(interactor->GetRenderWindow());
 436   vtkRenderer* renderer;
 437   if (VisibleInWindow>-1)
 438     renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
 439   else {
 440     return;
 441   }
 442
 443   double viewFocus[4],viewPoint[4],motionVector[3], focalDepth;
 444   double oldPos[3], newPos[3], distance[2];
 445   vtkCamera *camera = renderer->GetActiveCamera();
 446   camera->GetFocalPoint(viewFocus);
 447
 448   renderer->SetWorldPoint(viewFocus[0], viewFocus[0], viewFocus[0], 1.0);
 449   renderer->WorldToDisplay();
 450   renderer->GetDisplayPoint(viewFocus);
 451
 452   focalDepth = viewFocus[2];
 453
 454   oldPos[0] = renderer->GetCenter()[0];
 455   oldPos[1] = renderer->GetCenter()[1];
 456   oldPos[2] = focalDepth;
 457
 458   distance[0] = 1/factor*
 459                 (interactor->GetEventPosition()[0]-renderer->GetCenter()[0]);
 460   distance[1] = 1/factor*
 461                 (interactor->GetEventPosition()[1]-renderer->GetCenter()[1]);
 462
 463   newPos[0] = interactor->GetEventPosition()[0] - distance[0];
 464   newPos[1] = interactor->GetEventPosition()[1] - distance[1];
 465   newPos[2] = focalDepth;
 466
 467   renderer->DisplayToNormalizedDisplay(oldPos[0],oldPos[1]);
 468   renderer->NormalizedDisplayToViewport(oldPos[0],oldPos[1]);
 469   renderer->ViewportToNormalizedViewport(oldPos[0],oldPos[1]);
 470   renderer->NormalizedViewportToView(oldPos[0],oldPos[1],oldPos[2]);
 471   renderer->ViewToWorld(oldPos[0],oldPos[1],oldPos[2]);
 472
 473   renderer->DisplayToNormalizedDisplay(newPos[0],newPos[1]);
 474   renderer->NormalizedDisplayToViewport(newPos[0],newPos[1]);
 475   renderer->ViewportToNormalizedViewport(newPos[0],newPos[1]);
 476   renderer->NormalizedViewportToView(newPos[0],newPos[1],newPos[2]);
 477   renderer->ViewToWorld(newPos[0],newPos[1],newPos[2]);
 478
 479   motionVector[0] = newPos[0] - oldPos[0];
 480   motionVector[1] = newPos[1] - oldPos[1];
 481   motionVector[2] = newPos[2] - oldPos[2];
 482
 483   camera->GetFocalPoint(viewFocus);
 484   camera->GetPosition(viewPoint);
 485   camera->SetFocalPoint(motionVector[0] + viewFocus[0],
 486                         motionVector[1] + viewFocus[1],
 487                         motionVector[2] + viewFocus[2]);
 488
 489   camera->SetPosition(motionVector[0] + viewPoint[0],
 490                       motionVector[1] + viewPoint[1],
 491                       motionVector[2] + viewPoint[2]);
 492
 493   if (camera->GetParallelProjection()) {
 494     camera->SetParallelScale(camera->GetParallelScale() / factor);
 495   } else {
 496     camera->Dolly(factor);
 497   }
 498
 499   if (interactor->GetLightFollowCamera()) {
 500     renderer->UpdateLightsGeometryToFollowCamera();
 501   }
 502   renderer->ResetCameraClippingRange();
 503   //interactor->Render();
 504 }
 505 //------------------------------------------------------------------------------
 506
 507
 508 //------------------------------------------------------------------------------
 509 void vvSlicerManagerCommand::FlyToPosition(vtkRenderWindowInteractor *interactor,vvSlicer* slicer)
 510 {
 511   double flyFrom[3], flyTo[3];
 512   double d[3], focalPt[3], position[3], positionFrom[3];
 513   int i, j;
 514   int VisibleInWindow = this->FindSlicerNumber(interactor->GetRenderWindow());
 515   vtkRenderer* renderer=NULL;
 516   if (VisibleInWindow>-1)
 517     renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
 518   else
 519     return;
 520
 521   interactor->GetPicker()->Pick(interactor->GetEventPosition()[0],
 522                                 interactor->GetEventPosition()[1], 0.0,
 523                                 renderer);
 524
 525   vtkAssemblyPath *path=NULL;
 526   vtkAbstractPropPicker *picker;
 527   if ( (picker=vtkAbstractPropPicker::SafeDownCast(interactor->GetPicker()))) {
 528     path = picker->GetPath();
 529   }
 530   if ( path != NULL ) {
 531     flyTo[0] = picker->GetPickPosition()[0];
 532     flyTo[1] = picker->GetPickPosition()[1];
 533     flyTo[2] = picker->GetPickPosition()[2];
 534     renderer->GetActiveCamera()->GetFocalPoint(flyFrom);
 535     renderer->GetActiveCamera()->GetPosition(positionFrom);
 536
 537     switch (slicer->GetSliceOrientation()) {
 538     case vtkImageViewer2::SLICE_ORIENTATION_XY:
 539       flyTo[2] = flyFrom[2];
 540       break;
 541
 542     case vtkImageViewer2::SLICE_ORIENTATION_XZ:
 543       flyTo[1] = flyFrom[1];
 544       break;
 545
 546     case vtkImageViewer2::SLICE_ORIENTATION_YZ:
 547       flyTo[0] = flyFrom[0];
 548       break;
 549     }
 550
 551
 552     for (i=0; i<3; i++) {
 553       d[i] = flyTo[i] - flyFrom[i];
 554     }
 555     double distance = vtkMath::Normalize(d);
 556     double delta = distance/15;
 557
 558     for (i=1; i<=15; i++) {
 559       for (j=0; j<3; j++) {
 560         focalPt[j] = flyFrom[j] + d[j]*i*delta;
 561         position[j] = positionFrom[j] + d[j]*i*delta;
 562       }
 563       renderer->GetActiveCamera()->SetFocalPoint(focalPt);
 564       renderer->GetActiveCamera()->SetPosition(position);
 565       renderer->GetActiveCamera()->Dolly(0.3/15 + 1.0);
 566       renderer->ResetCameraClippingRange();
 567       interactor->Render();
 568     }
 569   }
 570 }
 571 //------------------------------------------------------------------------------