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://oncora1.lyon.fnclcc.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     {
  76         double x = isi->GetInteractor()->GetEventPosition()[0];
  77         double y = isi->GetInteractor()->GetEventPosition()[1];
  78         double z;
  79
  80         int VisibleInWindow = this->FindSlicerNumber(isi->GetInteractor()->GetRenderWindow());
  81         vtkRenderer* renderer=NULL;
  82         if (VisibleInWindow>-1)
  83             renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
  84         newLandmark = false;
  85
  86
  87
  88         if (event == vtkCommand::StartPickEvent && VisibleInWindow == -1)
  89         {
  90             for (int i = 0; i < this->SM->NumberOfSlicers(); i++)
  91             {
  92                 if (this->SM->GetSlicer(i)->GetCursorVisibility())
  93                 {
  94                     this->SM->GetSlicer(i)->SetCursorVisibility(0);
  95                     this->SM->GetSlicer(i)->Render();
  96                 }
  97             }
  98         }
  99         if ( VisibleInWindow > -1 )
 100         {
 101             if (event == vtkCommand::KeyPressEvent)
 102             {
 103                 std::string KeyPress = isi->GetInteractor()->GetKeySym();
 104                 if (KeyPress == "Tab")
 105                 {
 106                     if(isi->GetInteractor()->GetShiftKey())
 107                         this->SM->PrevImage(VisibleInWindow);
 108                     else
 109                         this->SM->NextImage(VisibleInWindow);
 110                     return;
 111                 }
 112                 if (KeyPress == "f" || KeyPress == "F")
 113                 {
 114                     FlyToPosition(isi->GetInteractor(),this->SM->GetSlicer(VisibleInWindow));
 115                     return;
 116                 }
 117                 if (KeyPress == "w")
 118                 {
 119                     this->SM->SetLocalColorWindowing(VisibleInWindow);
 120                     return;
 121                 }
 122                 if (KeyPress == "0")
 123                 {
 124                     this->SM->SetPreset(0);
 125                     this->SM->UpdateWindowLevel();
 126                     return;
 127                 }
 128                 if (KeyPress == "1")
 129                 {
 130                     this->SM->SetPreset(1);
 131                     this->SM->UpdateWindowLevel();
 132                     return;
 133                 }
 134                 if (KeyPress == "2")
 135                 {
 136                     this->SM->SetPreset(2);
 137                     this->SM->UpdateWindowLevel();
 138
 139                     return;
 140                 }
 141                 if (KeyPress == "3")
 142                 {
 143                     this->SM->SetPreset(3);
 144                     this->SM->UpdateWindowLevel();
 145                     return;
 146                 }
 147                 if (KeyPress == "4")
 148                 {
 149                     this->SM->SetPreset(4);
 150                     this->SM->UpdateWindowLevel();
 151                     return;
 152                 }
 153                 if (KeyPress == "5")
 154                 {
 155                     this->SM->SetPreset(5);
 156                     this->SM->UpdateWindowLevel();
 157                     return;
 158                 }
 159                 if (KeyPress == "6")
 160                 {
 161                     this->SM->SetColorMap(0);
 162                     this->SM->UpdateWindowLevel();
 163                     return;
 164                 }
 165                 if (KeyPress == "7")
 166                 {
 167                     this->SM->SetColorMap(1);
 168                     this->SM->UpdateWindowLevel();
 169                     return;
 170                 }
 171                 if (KeyPress == "8")
 172                 {
 173                     this->SM->SetColorMap(2);
 174                     this->SM->UpdateWindowLevel();
 175                     return;
 176                 }
 177                 if (KeyPress == "9")
 178                 {
 179                     this->SM->SetColorMap(3);
 180                     this->SM->UpdateWindowLevel();
 181                     return;
 182                 }
 183                 if (KeyPress == "equal") //keycodes are in vtkWin32RenderWindowInteractor
 184                 {
 185                     this->SM->SetPreset(7);
 186                     //this->SM->SetColorMap(1);
 187                     this->SM->UpdateWindowLevel();
 188                     return;
 189                 }
 190                 if (KeyPress == "minus")
 191                 {
 192                     this->SM->SetColorWindow(-this->SM->GetColorWindow());
 193                     this->SM->SetColorMap(-1);
 194                     this->SM->UpdateWindowLevel();
 195                     return;
 196                 }
 197                 if (KeyPress == "c")
 198                 {
 199                     this->SM->ToggleContourSuperposition();
 200                     this->SM->Render();
 201                     return;
 202                 }
 203                 if (KeyPress == "l")
 204                 {
 205                     this->SM->ToggleInterpolation();
 206                     this->SM->Render();
 207                     return;
 208                 }
 209                 if (KeyPress == "h")
 210                 {
 211                     this->SM->SetCursorVisibility(0);
 212                     this->SM->Render();
 213                     return;
 214                 }
 215                 if (KeyPress == "u")
 216                 {
 217                     this->SM->Reload();
 218                     this->SM->Render();
 219                     return;
 220                 }
 221                 if (KeyPress == "r" || KeyPress=="R")
 222                 {
 223                     this->SM->GetSlicer(VisibleInWindow)->ResetCamera();
 224                     this->SM->GetSlicer(VisibleInWindow)->Render();
 225                     return;
 226                 }
 227                 if (KeyPress == "g")
 228                 {
 229                     double* cursorPos = this->SM->GetSlicer(VisibleInWindow)->GetCursorPosition();
 230                     this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(
 231                             cursorPos[0],cursorPos[1],cursorPos[2],cursorPos[3]);
 232                     this->SM->UpdateViews(1,VisibleInWindow);
 233                     this->SM->UpdateLinked(VisibleInWindow);
 234                     return;
 235                 }
 236                 if (KeyPress == "F5")
 237                 {
 238                     this->SM->GetSlicer(VisibleInWindow)->FlipHorizontalView();
 239                     this->SM->GetSlicer(VisibleInWindow)->Render();
 240                     return;
 241                 }
 242                 if (KeyPress == "F6")
 243                 {
 244                     this->SM->GetSlicer(VisibleInWindow)->FlipVerticalView();
 245                     this->SM->GetSlicer(VisibleInWindow)->Render();
 246                     return;
 247                 }
 248                 if (KeyPress == "Up")
 249                 {
 250                     this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()+1);
 251                     this->SM->UpdateSlice(VisibleInWindow);
 252                     this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 253                 }
 254                 if (KeyPress == "Down")
 255                 {
 256                     this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()-1);
 257                     this->SM->UpdateSlice(VisibleInWindow);
 258                     this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 259                 }
 260                 if (KeyPress == "space")
 261                 {
 262                     newLandmark = true;
 263                 }
 264                 if (KeyPress == "Left")
 265                     this->SM->SetPreviousTSlice(VisibleInWindow);
 266                 if (KeyPress == "Right")
 267                     this->SM->SetNextTSlice(VisibleInWindow);
 268
 269                 if (KeyPress == "F2")
 270                 {
 271                     this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Sagital\n<slice>");
 272                     this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(0);
 273                     this->SM->UpdateSliceRange(VisibleInWindow);
 274                     this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 275                 }
 276                 if (KeyPress == "F3")
 277                 {
 278                     this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Coronal\n<slice>");
 279                     this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(1);
 280                     this->SM->UpdateSliceRange(VisibleInWindow);
 281                     this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 282                 }
 283                 if (KeyPress == "F4")
 284                 {
 285                     this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetText(2,"Axial\n<slice>");
 286                     this->SM->GetSlicer(VisibleInWindow)->SetSliceOrientation(2);
 287                     this->SM->UpdateSliceRange(VisibleInWindow);
 288                     this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 289                 }
 290
 291             }
 292
 293             //All type of mouse events
 294             if (event == vtkCommand::LeaveEvent)
 295             {
 296                 this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(-VTK_DOUBLE_MAX,-VTK_DOUBLE_MAX,
 297                         -VTK_DOUBLE_MAX,this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 298                 this->SM->GetSlicer(VisibleInWindow)->Render();
 299                 return;
 300             }
 301
 302             //DD(event);
 303             // Mouse release HERE
 304             if (event == vtkCommand::EndPickEvent) {
 305               //              DD(VisibleInWindow);
 306               if (VisibleInWindow > -1)
 307                 this->SM->LeftButtonReleaseEvent(VisibleInWindow);
 308               return; // no return !!!! ???
 309             }
 310
 311             if (event == vtkCommand::StartWindowLevelEvent)
 312             {
 313                 mStartSlicer = -1;
 314                 this->InitialWindow = this->SM->GetColorWindow();
 315                 this->InitialLevel = this->SM->GetColorLevel();
 316
 317                 if (VisibleInWindow > -1)
 318                 {
 319                     mStartSlicer = VisibleInWindow;
 320                 }
 321                 return;
 322             }
 323
 324             if (event == vtkCommand::EndWindowLevelEvent)
 325             {
 326                 mStartSlicer = -1;
 327             }
 328
 329         }
 330         if (VisibleInWindow > -1)
 331         {
 332             this->SM->Activated();
 333             //if(!this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->GetVisibility())
 334             this->SM->GetSlicer(VisibleInWindow)->GetAnnotation()->SetVisibility(1);
 335
 336             if (event == vtkCommand::MouseWheelForwardEvent && !isi->GetInteractor()->GetControlKey())
 337             {
 338                 this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()+1);
 339                 this->SM->UpdateSlice(VisibleInWindow);
 340                 this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 341             }
 342             else if (event == vtkCommand::MouseWheelForwardEvent && isi->GetInteractor()->GetControlKey())
 343             {
 344                 double factor = 2;
 345                 this->Dolly(pow((double)1.1, factor),isi->GetInteractor());
 346             }
 347             else if (event == vtkCommand::MouseWheelBackwardEvent && !isi->GetInteractor()->GetControlKey())
 348             {
 349                 this->SM->GetSlicer(VisibleInWindow)->SetSlice(this->SM->GetSlicer(VisibleInWindow)->GetSlice()-1);
 350                 this->SM->UpdateSlice(VisibleInWindow);
 351                 this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 352             }
 353             else if (event == vtkCommand::MouseWheelBackwardEvent && isi->GetInteractor()->GetControlKey())
 354             {
 355                 double factor = -2;
 356                 this->Dolly(pow((double)1.1, factor),isi->GetInteractor());
 357             }
 358             double xWorld=0; double yWorld=0; double zWorld=0;
 359
 360             //Move into World Coordinate
 361             renderer->DisplayToNormalizedDisplay(x,y);
 362             renderer->NormalizedDisplayToViewport(x,y);
 363             renderer->ViewportToNormalizedViewport(x,y);
 364             renderer->NormalizedViewportToView(x,y,z);
 365             renderer->ViewToWorld(x,y,z);
 366             switch (this->SM->GetSlicer(VisibleInWindow)->GetSliceOrientation())
 367             {
 368                 case vtkImageViewer2::SLICE_ORIENTATION_XY:
 369                     xWorld = x;
 370                     yWorld = y;
 371                     zWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 372                         this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[2] +
 373                         this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[2];
 374                     break;
 375
 376                 case vtkImageViewer2::SLICE_ORIENTATION_XZ:
 377                     xWorld = x;
 378                     yWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 379                         this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[1] +
 380                         this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[1];
 381                     zWorld = z;
 382                     break;
 383
 384                 case vtkImageViewer2::SLICE_ORIENTATION_YZ:
 385                     xWorld = this->SM->GetSlicer(VisibleInWindow)->GetSlice()*
 386                         this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetSpacing()[0] +
 387                         this->SM->GetSlicer(VisibleInWindow)->GetInput()->GetOrigin()[0];
 388                     yWorld = y;
 389                     zWorld = z;
 390                     break;
 391             }
 392             this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(xWorld,yWorld,zWorld,
 393                     this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 394             if (newLandmark)
 395             {
 396                 this->SM->AddLandmark(xWorld,yWorld,zWorld,
 397                                       this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 398                 this->SM->GetSlicer(VisibleInWindow)->UpdateLandmarks();
 399                 this->SM->Render();
 400             }
 401             if (event == vtkCommand::PickEvent || event == vtkCommand::StartPickEvent)
 402             {
 403                 this->SM->UpdateViews(1,VisibleInWindow);
 404                 this->SM->UpdateLinked(VisibleInWindow);
 405                 this->SM->UpdateInfoOnCursorPosition(VisibleInWindow);
 406             }
 407             else
 408             {
 409                 this->SM->GetSlicer(VisibleInWindow)->Render();
 410             }
 411             //this->SM->GetSlicer(VisibleInWindow)->SetCurrentPosition(-VTK_DOUBLE_MAX,-VTK_DOUBLE_MAX,
 412             //-VTK_DOUBLE_MAX,this->SM->GetSlicer(VisibleInWindow)->GetTSlice());
 413             //this->SM->GetSlicer(VisibleInWindow)->Render();
 414         }
 415
 416         if (event == vtkCommand::WindowLevelEvent && mStartSlicer > -1)
 417         {
 418             this->SM->GetSlicer(mStartSlicer)->GetAnnotation()->SetVisibility(1);
 419             // Adjust the window level here
 420             int *size = isi->GetInteractor()->GetRenderWindow()->GetSize();
 421             double window = this->InitialWindow;
 422             double level = this->InitialLevel;
 423             double range[2];
 424             this->SM->GetImage()->GetScalarRange(range);
 425
 426             // Compute normalized delta
 427             double dx = static_cast<double>(isi->GetWindowLevelCurrentPosition()[0] -
 428                                             isi->GetWindowLevelStartPosition()[0]) / size[0];
 429             double dy = static_cast<double>(isi->GetWindowLevelStartPosition()[1] -
 430                                             isi->GetWindowLevelCurrentPosition()[1]) / size[1];
 431             //Window is exponential in nature, use exponential to avoid falling into negative numbers
 432             dx = std::exp(1.0 * (dx*fabs(dx) + dx)) ; //Quadratic behavior for more reactive interface
 433             dy = 0.15 * (dy*fabs(dy) + dy) * (range[1]-range[0]);//Quadratic behavior for more reactive interface
 434
 435             this->SM->SetColorWindow(window*dx);
 436             this->SM->SetColorLevel(level-dy);
 437             this->SM->SetPreset(6);
 438             this->SM->UpdateWindowLevel();
 439             this->SM->Render();
 440             return;
 441         }
 442     }
 443 }
 444 //------------------------------------------------------------------------------
 445
 446
 447 //------------------------------------------------------------------------------
 448 void vvSlicerManagerCommand::Dolly(double factor, vtkRenderWindowInteractor *interactor)
 449 {
 450     int VisibleInWindow = this->FindSlicerNumber(interactor->GetRenderWindow());
 451     vtkRenderer* renderer;
 452     if (VisibleInWindow>-1)
 453         renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
 454     else
 455     {
 456         return;
 457     }
 458
 459     double viewFocus[4],viewPoint[4],motionVector[3], focalDepth;
 460     double oldPos[3], newPos[3], distance[2];
 461     vtkCamera *camera = renderer->GetActiveCamera();
 462     camera->GetFocalPoint(viewFocus);
 463
 464     renderer->SetWorldPoint(viewFocus[0], viewFocus[0], viewFocus[0], 1.0);
 465     renderer->WorldToDisplay();
 466     renderer->GetDisplayPoint(viewFocus);
 467
 468     focalDepth = viewFocus[2];
 469
 470     oldPos[0] = renderer->GetCenter()[0];
 471     oldPos[1] = renderer->GetCenter()[1];
 472     oldPos[2] = focalDepth;
 473
 474     distance[0] = 1/factor*
 475         (interactor->GetEventPosition()[0]-renderer->GetCenter()[0]);
 476     distance[1] = 1/factor*
 477         (interactor->GetEventPosition()[1]-renderer->GetCenter()[1]);
 478
 479     newPos[0] = interactor->GetEventPosition()[0] - distance[0];
 480     newPos[1] = interactor->GetEventPosition()[1] - distance[1];
 481     newPos[2] = focalDepth;
 482
 483     renderer->DisplayToNormalizedDisplay(oldPos[0],oldPos[1]);
 484     renderer->NormalizedDisplayToViewport(oldPos[0],oldPos[1]);
 485     renderer->ViewportToNormalizedViewport(oldPos[0],oldPos[1]);
 486     renderer->NormalizedViewportToView(oldPos[0],oldPos[1],oldPos[2]);
 487     renderer->ViewToWorld(oldPos[0],oldPos[1],oldPos[2]);
 488
 489     renderer->DisplayToNormalizedDisplay(newPos[0],newPos[1]);
 490     renderer->NormalizedDisplayToViewport(newPos[0],newPos[1]);
 491     renderer->ViewportToNormalizedViewport(newPos[0],newPos[1]);
 492     renderer->NormalizedViewportToView(newPos[0],newPos[1],newPos[2]);
 493     renderer->ViewToWorld(newPos[0],newPos[1],newPos[2]);
 494
 495     motionVector[0] = newPos[0] - oldPos[0];
 496     motionVector[1] = newPos[1] - oldPos[1];
 497     motionVector[2] = newPos[2] - oldPos[2];
 498
 499     camera->GetFocalPoint(viewFocus);
 500     camera->GetPosition(viewPoint);
 501     camera->SetFocalPoint(motionVector[0] + viewFocus[0],
 502                           motionVector[1] + viewFocus[1],
 503                           motionVector[2] + viewFocus[2]);
 504
 505     camera->SetPosition(motionVector[0] + viewPoint[0],
 506                         motionVector[1] + viewPoint[1],
 507                         motionVector[2] + viewPoint[2]);
 508
 509     if (camera->GetParallelProjection())
 510     {
 511         camera->SetParallelScale(camera->GetParallelScale() / factor);
 512     }
 513     else
 514     {
 515         camera->Dolly(factor);
 516     }
 517
 518     if (interactor->GetLightFollowCamera())
 519     {
 520         renderer->UpdateLightsGeometryToFollowCamera();
 521     }
 522     renderer->ResetCameraClippingRange();
 523     //interactor->Render();
 524 }
 525 //------------------------------------------------------------------------------
 526
 527
 528 //------------------------------------------------------------------------------
 529 void vvSlicerManagerCommand::FlyToPosition(vtkRenderWindowInteractor *interactor,vvSlicer* slicer)
 530 {
 531     double flyFrom[3], flyTo[3];
 532     double d[3], focalPt[3], position[3], positionFrom[3];
 533     int i, j;
 534     int VisibleInWindow = this->FindSlicerNumber(interactor->GetRenderWindow());
 535     vtkRenderer* renderer=NULL;
 536     if (VisibleInWindow>-1)
 537         renderer=this->SM->GetSlicer(VisibleInWindow)->GetRenderer();
 538     else
 539         return;
 540
 541     interactor->GetPicker()->Pick(interactor->GetEventPosition()[0],
 542                                   interactor->GetEventPosition()[1], 0.0,
 543                                   renderer);
 544
 545     vtkAssemblyPath *path=NULL;
 546     vtkAbstractPropPicker *picker;
 547     if ( (picker=vtkAbstractPropPicker::SafeDownCast(interactor->GetPicker())))
 548     {
 549         path = picker->GetPath();
 550     }
 551     if ( path != NULL )
 552     {
 553         flyTo[0] = picker->GetPickPosition()[0];
 554         flyTo[1] = picker->GetPickPosition()[1];
 555         flyTo[2] = picker->GetPickPosition()[2];
 556         renderer->GetActiveCamera()->GetFocalPoint(flyFrom);
 557         renderer->GetActiveCamera()->GetPosition(positionFrom);
 558
 559         switch (slicer->GetSliceOrientation())
 560         {
 561         case vtkImageViewer2::SLICE_ORIENTATION_XY:
 562             flyTo[2] = flyFrom[2];
 563             break;
 564
 565         case vtkImageViewer2::SLICE_ORIENTATION_XZ:
 566             flyTo[1] = flyFrom[1];
 567             break;
 568
 569         case vtkImageViewer2::SLICE_ORIENTATION_YZ:
 570             flyTo[0] = flyFrom[0];
 571             break;
 572         }
 573
 574
 575         for (i=0; i<3; i++)
 576         {
 577             d[i] = flyTo[i] - flyFrom[i];
 578         }
 579         double distance = vtkMath::Normalize(d);
 580         double delta = distance/15;
 581
 582         for (i=1; i<=15; i++)
 583         {
 584             for (j=0; j<3; j++)
 585             {
 586                 focalPt[j] = flyFrom[j] + d[j]*i*delta;
 587                 position[j] = positionFrom[j] + d[j]*i*delta;
 588             }
 589             renderer->GetActiveCamera()->SetFocalPoint(focalPt);
 590             renderer->GetActiveCamera()->SetPosition(position);
 591             renderer->GetActiveCamera()->Dolly(0.3/15 + 1.0);
 592             renderer->ResetCameraClippingRange();
 593             interactor->Render();
 594         }
 595     }
 596 }
 597 //------------------------------------------------------------------------------