text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    vtkCheckerboardRepresentation.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 "vtkCheckerboardRepresentation.h"
  #include "vtkCommand.h"
  #include "vtkImageActor.h"
  #include "vtkImageCheckerboard.h"
  #include "vtkImageData.h"
  #include "vtkImageMapper3D.h"
  #include "vtkObjectFactory.h"
  #include "vtkSliderRepresentation3D.h"
  
  vtkStandardNewMacro(vtkCheckerboardRepresentation);
  
  vtkCxxSetObjectMacro(vtkCheckerboardRepresentation, Checkerboard, vtkImageCheckerboard);
  vtkCxxSetObjectMacro(vtkCheckerboardRepresentation, ImageActor, vtkImageActor);
  
  vtkCxxSetObjectMacro(vtkCheckerboardRepresentation, TopRepresentation, vtkSliderRepresentation3D);
  vtkCxxSetObjectMacro(vtkCheckerboardRepresentation, RightRepresentation, vtkSliderRepresentation3D);
  vtkCxxSetObjectMacro(
    vtkCheckerboardRepresentation, BottomRepresentation, vtkSliderRepresentation3D);
  vtkCxxSetObjectMacro(vtkCheckerboardRepresentation, LeftRepresentation, vtkSliderRepresentation3D);
  
  //----------------------------------------------------------------------
  vtkCheckerboardRepresentation::vtkCheckerboardRepresentation()
  {
    this->Checkerboard = nullptr;
    this->ImageActor = nullptr;
  
    this->TopRepresentation = vtkSliderRepresentation3D::New();
    this->TopRepresentation->ShowSliderLabelOff();
    this->TopRepresentation->SetTitleText(nullptr);
    this->TopRepresentation->GetPoint1Coordinate()->SetCoordinateSystemToWorld();
    this->TopRepresentation->GetPoint2Coordinate()->SetCoordinateSystemToWorld();
    this->TopRepresentation->SetSliderLength(0.050);
    this->TopRepresentation->SetSliderWidth(0.025);
    this->TopRepresentation->SetTubeWidth(0.015);
    this->TopRepresentation->SetEndCapLength(0.0);
    this->TopRepresentation->SetMinimumValue(1);
    this->TopRepresentation->SetMaximumValue(10);
    this->TopRepresentation->SetSliderShapeToCylinder();
  
    this->RightRepresentation = vtkSliderRepresentation3D::New();
    this->RightRepresentation->ShowSliderLabelOff();
    this->RightRepresentation->SetTitleText(nullptr);
    this->RightRepresentation->GetPoint1Coordinate()->SetCoordinateSystemToWorld();
    this->RightRepresentation->GetPoint2Coordinate()->SetCoordinateSystemToWorld();
    this->RightRepresentation->SetSliderLength(0.050);
    this->RightRepresentation->SetSliderWidth(0.025);
    this->RightRepresentation->SetTubeWidth(0.015);
    this->RightRepresentation->SetEndCapLength(0.0);
    this->RightRepresentation->SetMinimumValue(1);
    this->RightRepresentation->SetMaximumValue(10);
    this->RightRepresentation->SetSliderShapeToCylinder();
  
    this->BottomRepresentation = vtkSliderRepresentation3D::New();
    this->BottomRepresentation->ShowSliderLabelOff();
    this->BottomRepresentation->SetTitleText(nullptr);
    this->BottomRepresentation->GetPoint1Coordinate()->SetCoordinateSystemToWorld();
    this->BottomRepresentation->GetPoint2Coordinate()->SetCoordinateSystemToWorld();
    this->BottomRepresentation->SetSliderLength(0.050);
    this->BottomRepresentation->SetSliderWidth(0.025);
    this->BottomRepresentation->SetTubeWidth(0.015);
    this->BottomRepresentation->SetEndCapLength(0.0);
    this->BottomRepresentation->SetMinimumValue(1);
    this->BottomRepresentation->SetMaximumValue(10);
    this->BottomRepresentation->SetSliderShapeToCylinder();
  
    this->LeftRepresentation = vtkSliderRepresentation3D::New();
    this->LeftRepresentation->ShowSliderLabelOff();
    this->LeftRepresentation->SetTitleText(nullptr);
    this->LeftRepresentation->GetPoint1Coordinate()->SetCoordinateSystemToWorld();
    this->LeftRepresentation->GetPoint2Coordinate()->SetCoordinateSystemToWorld();
    this->LeftRepresentation->SetSliderLength(0.050);
    this->LeftRepresentation->SetSliderWidth(0.025);
    this->LeftRepresentation->SetTubeWidth(0.015);
    this->LeftRepresentation->SetEndCapLength(0.0);
    this->LeftRepresentation->SetMinimumValue(1);
    this->LeftRepresentation->SetMaximumValue(10);
    this->LeftRepresentation->SetSliderShapeToCylinder();
  
    this->CornerOffset = 0.00;
    this->OrthoAxis = 2;
  }
  
  //----------------------------------------------------------------------
  vtkCheckerboardRepresentation::~vtkCheckerboardRepresentation()
  {
    if (this->Checkerboard)
    {
      this->Checkerboard->Delete();
    }
    if (this->ImageActor)
    {
      this->ImageActor->Delete();
    }
  
    this->TopRepresentation->Delete();
    this->RightRepresentation->Delete();
    this->BottomRepresentation->Delete();
    this->LeftRepresentation->Delete();
  }
  
  //----------------------------------------------------------------------
  void vtkCheckerboardRepresentation::SliderValueChanged(int sliderNum)
  {
    int* numDivisions = this->Checkerboard->GetNumberOfDivisions();
    int value;
    int div[] = { 1, 1, 1 };
  
    if (sliderNum == vtkCheckerboardRepresentation::TopSlider)
    {
      value = static_cast<int>(this->TopRepresentation->GetValue());
      this->BottomRepresentation->SetValue(this->TopRepresentation->GetValue());
      switch (this->OrthoAxis)
      {
        case 0:
          div[1] = value;
          div[2] = numDivisions[2];
          break;
        case 1:
          div[0] = value;
          div[2] = numDivisions[2];
          break;
        case 2:
          div[0] = value;
          div[1] = numDivisions[1];
          break;
      }
  
      this->Checkerboard->SetNumberOfDivisions(div);
    }
    else if (sliderNum == vtkCheckerboardRepresentation::RightSlider)
    {
      value = static_cast<int>(this->RightRepresentation->GetValue());
      this->LeftRepresentation->SetValue(this->RightRepresentation->GetValue());
      switch (this->OrthoAxis)
      {
        case 0:
          div[1] = numDivisions[1];
          div[2] = value;
          break;
        case 1:
          div[0] = numDivisions[0];
          div[2] = value;
          break;
        case 2:
          div[0] = numDivisions[0];
          div[1] = value;
          break;
      }
  
      this->Checkerboard->SetNumberOfDivisions(div);
    }
    else if (sliderNum == vtkCheckerboardRepresentation::BottomSlider)
    {
      value = static_cast<int>(this->BottomRepresentation->GetValue());
      this->TopRepresentation->SetValue(this->BottomRepresentation->GetValue());
      switch (this->OrthoAxis)
      {
        case 0:
          div[1] = value;
          div[2] = numDivisions[2];
          break;
        case 1:
          div[0] = value;
          div[2] = numDivisions[2];
          break;
        case 2:
          div[0] = value;
          div[1] = numDivisions[1];
          break;
      }
  
      this->Checkerboard->SetNumberOfDivisions(div);
    }
    else if (sliderNum == vtkCheckerboardRepresentation::LeftSlider)
    {
      value = static_cast<int>(this->LeftRepresentation->GetValue());
      this->RightRepresentation->SetValue(this->LeftRepresentation->GetValue());
      switch (this->OrthoAxis)
      {
        case 0:
          div[1] = numDivisions[1];
          div[2] = value;
          break;
        case 1:
          div[0] = numDivisions[0];
          div[2] = value;
          break;
        case 2:
          div[0] = numDivisions[0];
          div[1] = value;
          break;
      }
  
      this->Checkerboard->SetNumberOfDivisions(div);
    }
  }
  
  //----------------------------------------------------------------------
  void vtkCheckerboardRepresentation::BuildRepresentation()
  {
    // Make sure that the checkerboard is up to date
    if (!this->Checkerboard || !this->ImageActor)
    {
      vtkErrorMacro("requires a checkerboard and image actor");
      return;
    }
  
    double bounds[6];
    vtkImageData* image = this->ImageActor->GetInput();
    this->ImageActor->GetMapper()->GetInputAlgorithm()->Update();
    image->GetBounds(bounds);
    if (image->GetDataDimension() != 2)
    {
      vtkErrorMacro(<< " requires a 2D image");
      return;
    }
    double t0 = bounds[1] - bounds[0];
    double t1 = bounds[3] - bounds[2];
    double t2 = bounds[5] - bounds[4];
    this->OrthoAxis = (t0 < t1 ? (t0 < t2 ? 0 : 2) : (t1 < t2 ? 1 : 2));
    double o0 = t0 * this->CornerOffset;
    double o1 = t1 * this->CornerOffset;
    double o2 = t2 * this->CornerOffset;
  
    // Set up the initial values in the slider widgets
    int* numDivisions = this->Checkerboard->GetNumberOfDivisions();
  
    if (this->OrthoAxis == 0) // x-axis
    {
      // point1 and point2 are switched for top and bottom in case a
      // user wants to see the slider label positions as text, and
      // rotation of the text about the slider's local x-axis must be
      // set correctly.  Similar logic applies to X-Z plane case.
  
      this->TopRepresentation->GetPoint2Coordinate()->SetValue(bounds[0], bounds[2] + o1, bounds[5]);
      this->TopRepresentation->GetPoint1Coordinate()->SetValue(bounds[0], bounds[3] - o1, bounds[5]);
      this->TopRepresentation->SetValue(numDivisions[1]);
      this->TopRepresentation->SetRotation(90.0);
  
      this->RightRepresentation->GetPoint1Coordinate()->SetValue(
        bounds[0], bounds[3], bounds[4] + o2);
      this->RightRepresentation->GetPoint2Coordinate()->SetValue(
        bounds[0], bounds[3], bounds[5] - o2);
      this->RightRepresentation->SetValue(numDivisions[2]);
      this->RightRepresentation->SetRotation(0.0);
  
      this->BottomRepresentation->GetPoint2Coordinate()->SetValue(
        bounds[0], bounds[2] + o1, bounds[4]);
      this->BottomRepresentation->GetPoint1Coordinate()->SetValue(
        bounds[0], bounds[3] - o1, bounds[4]);
      this->BottomRepresentation->SetValue(numDivisions[1]);
      this->BottomRepresentation->SetRotation(90.0);
  
      this->LeftRepresentation->GetPoint1Coordinate()->SetValue(bounds[0], bounds[2], bounds[4] + o2);
      this->LeftRepresentation->GetPoint2Coordinate()->SetValue(bounds[0], bounds[2], bounds[5] - o2);
      this->LeftRepresentation->SetValue(numDivisions[2]);
      this->LeftRepresentation->SetRotation(0.0);
    }
    else if (this->OrthoAxis == 1) // y-axis
    {
      this->TopRepresentation->GetPoint1Coordinate()->SetValue(bounds[0] + o0, bounds[2], bounds[5]);
      this->TopRepresentation->GetPoint2Coordinate()->SetValue(bounds[1] - o0, bounds[2], bounds[5]);
      this->TopRepresentation->SetValue(numDivisions[0]);
      this->TopRepresentation->SetRotation(90.0);
  
      this->RightRepresentation->GetPoint1Coordinate()->SetValue(
        bounds[1], bounds[2], bounds[4] + o2);
      this->RightRepresentation->GetPoint2Coordinate()->SetValue(
        bounds[1], bounds[2], bounds[5] - o2);
      this->RightRepresentation->SetValue(numDivisions[2]);
      this->RightRepresentation->SetRotation(90.0);
  
      this->BottomRepresentation->GetPoint1Coordinate()->SetValue(
        bounds[0] + o0, bounds[2], bounds[4]);
      this->BottomRepresentation->GetPoint2Coordinate()->SetValue(
        bounds[1] - o0, bounds[2], bounds[4]);
      this->BottomRepresentation->SetValue(numDivisions[0]);
      this->BottomRepresentation->SetRotation(90.0);
  
      this->LeftRepresentation->GetPoint1Coordinate()->SetValue(bounds[0], bounds[2], bounds[4] + o2);
      this->LeftRepresentation->GetPoint2Coordinate()->SetValue(bounds[0], bounds[2], bounds[5] - o2);
      this->LeftRepresentation->SetValue(numDivisions[2]);
      this->LeftRepresentation->SetRotation(90.0);
    }
    else // if( orthoAxis == 2 ) //z-axis
    {
      this->TopRepresentation->GetPoint1Coordinate()->SetValue(bounds[0] + o0, bounds[3], bounds[4]);
      this->TopRepresentation->GetPoint2Coordinate()->SetValue(bounds[1] - o0, bounds[3], bounds[4]);
      this->TopRepresentation->SetValue(numDivisions[0]);
      this->TopRepresentation->SetRotation(0.0);
  
      this->RightRepresentation->GetPoint1Coordinate()->SetValue(
        bounds[1], bounds[2] + o1, bounds[4]);
      this->RightRepresentation->GetPoint2Coordinate()->SetValue(
        bounds[1], bounds[3] - o1, bounds[4]);
      this->RightRepresentation->SetValue(numDivisions[1]);
      this->RightRepresentation->SetRotation(0.0);
  
      this->BottomRepresentation->GetPoint1Coordinate()->SetValue(
        bounds[0] + o0, bounds[2], bounds[4]);
      this->BottomRepresentation->GetPoint2Coordinate()->SetValue(
        bounds[1] - o0, bounds[2], bounds[4]);
      this->BottomRepresentation->SetValue(numDivisions[0]);
      this->BottomRepresentation->SetRotation(0.0);
  
      this->LeftRepresentation->GetPoint1Coordinate()->SetValue(bounds[0], bounds[2] + o1, bounds[4]);
      this->LeftRepresentation->GetPoint2Coordinate()->SetValue(bounds[0], bounds[3] - o1, bounds[4]);
      this->LeftRepresentation->SetValue(numDivisions[1]);
      this->LeftRepresentation->SetRotation(0.0);
    }
  
    this->TopRepresentation->BuildRepresentation();
    this->RightRepresentation->BuildRepresentation();
    this->BottomRepresentation->BuildRepresentation();
    this->LeftRepresentation->BuildRepresentation();
  }
  
  //----------------------------------------------------------------------
  void vtkCheckerboardRepresentation::GetActors(vtkPropCollection* pc)
  {
    this->TopRepresentation->GetActors(pc);
    this->RightRepresentation->GetActors(pc);
    this->BottomRepresentation->GetActors(pc);
    this->LeftRepresentation->GetActors(pc);
  }
  
  //----------------------------------------------------------------------
  void vtkCheckerboardRepresentation::ReleaseGraphicsResources(vtkWindow* w)
  {
    this->TopRepresentation->ReleaseGraphicsResources(w);
    this->RightRepresentation->ReleaseGraphicsResources(w);
    this->BottomRepresentation->ReleaseGraphicsResources(w);
    this->LeftRepresentation->ReleaseGraphicsResources(w);
  }
  
  //----------------------------------------------------------------------
  int vtkCheckerboardRepresentation::RenderOverlay(vtkViewport* v)
  {
    int count = this->TopRepresentation->RenderOverlay(v);
    count += this->RightRepresentation->RenderOverlay(v);
    count += this->BottomRepresentation->RenderOverlay(v);
    count += this->LeftRepresentation->RenderOverlay(v);
    return count;
  }
  
  //----------------------------------------------------------------------
  int vtkCheckerboardRepresentation::RenderOpaqueGeometry(vtkViewport* v)
  {
    int count = this->TopRepresentation->RenderOpaqueGeometry(v);
    count += this->RightRepresentation->RenderOpaqueGeometry(v);
    count += this->BottomRepresentation->RenderOpaqueGeometry(v);
    count += this->LeftRepresentation->RenderOpaqueGeometry(v);
    return count;
  }
  
  //-----------------------------------------------------------------------------
  int vtkCheckerboardRepresentation::RenderTranslucentPolygonalGeometry(vtkViewport* v)
  {
    int count = this->TopRepresentation->RenderTranslucentPolygonalGeometry(v);
    count += this->RightRepresentation->RenderTranslucentPolygonalGeometry(v);
    count += this->BottomRepresentation->RenderTranslucentPolygonalGeometry(v);
    count += this->LeftRepresentation->RenderTranslucentPolygonalGeometry(v);
    return count;
  }
  //-----------------------------------------------------------------------------
  vtkTypeBool vtkCheckerboardRepresentation::HasTranslucentPolygonalGeometry()
  {
    int result = this->TopRepresentation->HasTranslucentPolygonalGeometry();
    result |= this->RightRepresentation->HasTranslucentPolygonalGeometry();
    result |= this->BottomRepresentation->HasTranslucentPolygonalGeometry();
    result |= this->LeftRepresentation->HasTranslucentPolygonalGeometry();
    return result;
  }
  
  //----------------------------------------------------------------------
  void vtkCheckerboardRepresentation::PrintSelf(ostream& os, vtkIndent indent)
  {
    // Superclass typedef defined in vtkTypeMacro() found in vtkSetGet.h
    this->Superclass::PrintSelf(os, indent);
  
    if (this->ImageActor)
    {
      os << indent << "Image Actor: " << this->ImageActor << "\n";
    }
    else
    {
      os << indent << "Image Actor: (none)\n";
    }
  
    if (this->Checkerboard)
    {
      os << indent << "Checkerboard: " << this->Checkerboard << "\n";
    }
    else
    {
      os << indent << "Image Checkerboard: (none)\n";
    }
  
    os << indent << "Corner Offset: " << this->CornerOffset << "\n";
  
    os << indent << "Top Representation\n";
    this->TopRepresentation->PrintSelf(os, indent.GetNextIndent());
  
    os << indent << "Bottom Representation\n";
    this->BottomRepresentation->PrintSelf(os, indent.GetNextIndent());
  
    os << indent << "Right Representation\n";
    this->RightRepresentation->PrintSelf(os, indent.GetNextIndent());
  
    os << indent << "Left Representation\n";
    this->LeftRepresentation->PrintSelf(os, indent.GetNextIndent());
  }
  