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