/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkOrientedGlyphFocalPlaneContourRepresentation.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 "vtkOrientedGlyphFocalPlaneContourRepresentation.h"
#include "vtkActor2D.h"
#include "vtkAssemblyPath.h"
#include "vtkBezierContourLineInterpolator.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkCleanPolyData.h"
#include "vtkCoordinate.h"
#include "vtkCursor2D.h"
#include "vtkCylinderSource.h"
#include "vtkDoubleArray.h"
#include "vtkFocalPlanePointPlacer.h"
#include "vtkGlyph2D.h"
#include "vtkInteractorObserver.h"
#include "vtkLine.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper2D.h"
#include "vtkProperty2D.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkTransform.h"
#include "vtkTransformPolyDataFilter.h"

vtkStandardNewMacro(vtkOrientedGlyphFocalPlaneContourRepresentation);

//------------------------------------------------------------------------------
vtkOrientedGlyphFocalPlaneContourRepresentation::vtkOrientedGlyphFocalPlaneContourRepresentation()
{

  // Initialize state
  this->InteractionState = vtkContourRepresentation::Outside;

  this->CursorShape = nullptr;
  this->ActiveCursorShape = nullptr;

  this->HandleSize = 0.01;

  this->LineInterpolator = vtkBezierContourLineInterpolator::New();

  // Represent the position of the cursor
  this->FocalPoint = vtkPoints::New();
  this->FocalPoint->SetNumberOfPoints(100);
  this->FocalPoint->SetNumberOfPoints(1);
  this->FocalPoint->SetPoint(0, 0.0, 0.0, 0.0);

  vtkDoubleArray* normals = vtkDoubleArray::New();
  normals->SetNumberOfComponents(3);
  normals->SetNumberOfTuples(100);
  normals->SetNumberOfTuples(1);
  double n[3] = { 0, 0, 0 };
  normals->SetTuple(0, n);

  // Represent the position of the cursor
  this->ActiveFocalPoint = vtkPoints::New();
  this->ActiveFocalPoint->SetNumberOfPoints(100);
  this->ActiveFocalPoint->SetNumberOfPoints(1);
  this->ActiveFocalPoint->SetPoint(0, 0.0, 0.0, 0.0);

  vtkDoubleArray* activeNormals = vtkDoubleArray::New();
  activeNormals->SetNumberOfComponents(3);
  activeNormals->SetNumberOfTuples(100);
  activeNormals->SetNumberOfTuples(1);
  activeNormals->SetTuple(0, n);

  this->FocalData = vtkPolyData::New();
  this->FocalData->SetPoints(this->FocalPoint);
  this->FocalData->GetPointData()->SetNormals(normals);
  normals->Delete();

  this->ActiveFocalData = vtkPolyData::New();
  this->ActiveFocalData->SetPoints(this->ActiveFocalPoint);
  this->ActiveFocalData->GetPointData()->SetNormals(activeNormals);
  activeNormals->Delete();

  this->Glypher = vtkGlyph2D::New();
  this->Glypher->SetInputData(this->FocalData);
  this->Glypher->SetVectorModeToUseNormal();
  this->Glypher->OrientOn();
  this->Glypher->ScalingOn();
  this->Glypher->SetScaleModeToDataScalingOff();
  this->Glypher->SetScaleFactor(1.0);

  this->ActiveGlypher = vtkGlyph2D::New();
  this->ActiveGlypher->SetInputData(this->ActiveFocalData);
  this->ActiveGlypher->SetVectorModeToUseNormal();
  this->ActiveGlypher->OrientOn();
  this->ActiveGlypher->ScalingOn();
  this->ActiveGlypher->SetScaleModeToDataScalingOff();
  this->ActiveGlypher->SetScaleFactor(1.0);

  // The transformation of the cursor will be done via vtkGlyph3D
  // By default a vtkCursor2D will be used to define the cursor shape
  vtkCursor2D* cursor2D = vtkCursor2D::New();
  cursor2D->AllOff();
  cursor2D->PointOn();
  cursor2D->Update();
  this->SetCursorShape(cursor2D->GetOutput());
  cursor2D->Delete();

  vtkCylinderSource* cylinder = vtkCylinderSource::New();
  cylinder->SetResolution(64);
  cylinder->SetRadius(0.5);
  cylinder->SetHeight(0.0);
  cylinder->CappingOff();
  cylinder->SetCenter(0, 0, 0);

  vtkCleanPolyData* clean = vtkCleanPolyData::New();
  clean->PointMergingOn();
  clean->CreateDefaultLocator();
  clean->SetInputConnection(cylinder->GetOutputPort());

  vtkTransform* t = vtkTransform::New();
  t->RotateZ(90.0);

  vtkTransformPolyDataFilter* tpd = vtkTransformPolyDataFilter::New();
  tpd->SetInputConnection(clean->GetOutputPort());
  tpd->SetTransform(t);
  clean->Delete();
  cylinder->Delete();

  tpd->Update();
  this->SetActiveCursorShape(tpd->GetOutput());
  tpd->Delete();
  t->Delete();

  this->Glypher->SetSourceData(this->CursorShape);
  this->ActiveGlypher->SetSourceData(this->ActiveCursorShape);

  this->Mapper = vtkPolyDataMapper2D::New();
  this->Mapper->SetInputConnection(this->Glypher->GetOutputPort());
  // this->Mapper->SetResolveCoincidentTopologyToPolygonOffset();
  this->Mapper->ScalarVisibilityOff();

  this->ActiveMapper = vtkPolyDataMapper2D::New();
  this->ActiveMapper->SetInputConnection(this->ActiveGlypher->GetOutputPort());
  // this->ActiveMapper->SetResolveCoincidentTopologyToPolygonOffset();
  this->ActiveMapper->ScalarVisibilityOff();

  // Set up the initial properties
  this->CreateDefaultProperties();

  this->Actor = vtkActor2D::New();
  this->Actor->SetMapper(this->Mapper);
  this->Actor->SetProperty(this->Property);

  this->ActiveActor = vtkActor2D::New();
  this->ActiveActor->SetMapper(this->ActiveMapper);
  this->ActiveActor->SetProperty(this->ActiveProperty);

  this->Lines = vtkPolyData::New();
  this->LinesMapper = vtkPolyDataMapper2D::New();
  this->LinesMapper->SetInputData(this->Lines);

  this->LinesActor = vtkActor2D::New();
  this->LinesActor->SetMapper(this->LinesMapper);
  this->LinesActor->SetProperty(this->LinesProperty);

  this->InteractionOffset[0] = 0.0;
  this->InteractionOffset[1] = 0.0;

  this->LinesWorldCoordinates = vtkPolyData::New();
  this->ContourPlaneDirectionCosines = vtkMatrix4x4::New();
}

//------------------------------------------------------------------------------
vtkOrientedGlyphFocalPlaneContourRepresentation::~vtkOrientedGlyphFocalPlaneContourRepresentation()
{
  this->FocalPoint->Delete();
  this->FocalData->Delete();

  this->ActiveFocalPoint->Delete();
  this->ActiveFocalData->Delete();

  this->SetCursorShape(nullptr);
  this->SetActiveCursorShape(nullptr);

  this->Glypher->Delete();
  this->Mapper->Delete();
  this->Actor->Delete();

  this->ActiveGlypher->Delete();
  this->ActiveMapper->Delete();
  this->ActiveActor->Delete();

  this->Lines->Delete();
  this->LinesMapper->Delete();
  this->LinesActor->Delete();

  this->Property->Delete();
  this->ActiveProperty->Delete();
  this->LinesProperty->Delete();

  this->LinesWorldCoordinates->Delete();
  this->ContourPlaneDirectionCosines->Delete();
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::SetCursorShape(vtkPolyData* shape)
{
  if (shape != this->CursorShape)
  {
    if (this->CursorShape)
    {
      this->CursorShape->Delete();
    }
    this->CursorShape = shape;
    if (this->CursorShape)
    {
      this->CursorShape->Register(this);
    }
    if (this->CursorShape)
    {
      this->Glypher->SetSourceData(this->CursorShape);
    }
    this->Modified();
  }
}

//------------------------------------------------------------------------------
vtkPolyData* vtkOrientedGlyphFocalPlaneContourRepresentation::GetCursorShape()
{
  return this->CursorShape;
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::SetActiveCursorShape(vtkPolyData* shape)
{
  if (shape != this->ActiveCursorShape)
  {
    if (this->ActiveCursorShape)
    {
      this->ActiveCursorShape->Delete();
    }
    this->ActiveCursorShape = shape;
    if (this->ActiveCursorShape)
    {
      this->ActiveCursorShape->Register(this);
    }
    if (this->ActiveCursorShape)
    {
      this->ActiveGlypher->SetSourceData(this->ActiveCursorShape);
    }
    this->Modified();
  }
}

//------------------------------------------------------------------------------
vtkPolyData* vtkOrientedGlyphFocalPlaneContourRepresentation::GetActiveCursorShape()
{
  return this->ActiveCursorShape;
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::SetRenderer(vtkRenderer* ren)
{
  //  this->WorldPosition->SetViewport(ren);
  this->Superclass::SetRenderer(ren);
}

//------------------------------------------------------------------------------
int vtkOrientedGlyphFocalPlaneContourRepresentation::ComputeInteractionState(
  int X, int Y, int vtkNotUsed(modified))
{

  double pos[4], xyz[3];
  this->FocalPoint->GetPoint(0, pos);
  pos[3] = 1.0;
  this->Renderer->SetWorldPoint(pos);
  this->Renderer->WorldToDisplay();
  this->Renderer->GetDisplayPoint(pos);

  xyz[0] = static_cast<double>(X);
  xyz[1] = static_cast<double>(Y);
  xyz[2] = pos[2];

  this->VisibilityOn();
  double tol2 = this->PixelTolerance * this->PixelTolerance;
  if (vtkMath::Distance2BetweenPoints(xyz, pos) <= tol2)
  {
    this->InteractionState = vtkContourRepresentation::Nearby;
    if (!this->ActiveCursorShape)
    {
      this->VisibilityOff();
    }
  }
  else
  {
    this->InteractionState = vtkContourRepresentation::Outside;
    if (!this->CursorShape)
    {
      this->VisibilityOff();
    }
  }

  return this->InteractionState;
}

//------------------------------------------------------------------------------
// Record the current event position, and the rectilinear wipe position.
void vtkOrientedGlyphFocalPlaneContourRepresentation::StartWidgetInteraction(
  double startEventPos[2])
{
  this->StartEventPosition[0] = startEventPos[0];
  this->StartEventPosition[1] = startEventPos[1];
  this->StartEventPosition[2] = 0.0;

  this->LastEventPosition[0] = startEventPos[0];
  this->LastEventPosition[1] = startEventPos[1];

  // How far is this in pixels from the position of this widget?
  // Maintain this during interaction such as translating (don't
  // force center of widget to snap to mouse position)

  // convert position to display coordinates
  double pos[2];
  this->GetNthNodeDisplayPosition(this->ActiveNode, pos);

  this->InteractionOffset[0] = pos[0] - startEventPos[0];
  this->InteractionOffset[1] = pos[1] - startEventPos[1];
}

//------------------------------------------------------------------------------
// Based on the displacement vector (computed in display coordinates) and
// the cursor state (which corresponds to which part of the widget has been
// selected), the widget points are modified.
// First construct a local coordinate system based on the display coordinates
// of the widget.
void vtkOrientedGlyphFocalPlaneContourRepresentation::WidgetInteraction(double eventPos[2])
{
  // Process the motion
  if (this->CurrentOperation == vtkContourRepresentation::Translate)
  {
    this->Translate(eventPos);
  }
  if (this->CurrentOperation == vtkContourRepresentation::Shift)
  {
    this->ShiftContour(eventPos);
  }
  if (this->CurrentOperation == vtkContourRepresentation::Scale)
  {
    this->ScaleContour(eventPos);
  }

  // Book keeping
  this->LastEventPosition[0] = eventPos[0];
  this->LastEventPosition[1] = eventPos[1];
}

//------------------------------------------------------------------------------
// Translate everything
void vtkOrientedGlyphFocalPlaneContourRepresentation::Translate(double eventPos[2])
{
  double ref[3];

  if (!this->GetActiveNodeWorldPosition(ref))
  {
    return;
  }

  double displayPos[2];
  displayPos[0] = eventPos[0] + this->InteractionOffset[0];
  displayPos[1] = eventPos[1] + this->InteractionOffset[1];

  // vtkFocalPlaneContourRepresentation won't have SetActiveNodeToWorldPosition
  // it will have SetActiveNodeToDisplayPosition.. add the display pos
  // for the 3D below

  double worldPos[3];
  double worldOrient[9];
  if (this->PointPlacer->ComputeWorldPosition(
        this->Renderer, displayPos, ref, worldPos, worldOrient))
  {
    this->SetActiveNodeToWorldPosition(worldPos, worldOrient);
  }
  else
  {
    // I really want to track the closest point here,
    // but I am postponing this at the moment....
  }
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::ShiftContour(double eventPos[2])
{
  double ref[3];

  if (!this->GetActiveNodeWorldPosition(ref))
  {
    return;
  }

  double displayPos[2];
  displayPos[0] = eventPos[0] + this->InteractionOffset[0];
  displayPos[1] = eventPos[1] + this->InteractionOffset[1];

  double worldPos[3];
  double worldOrient[9] = { 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 };
  if (this->PointPlacer->ComputeWorldPosition(
        this->Renderer, displayPos, ref, worldPos, worldOrient))
  {

    this->SetActiveNodeToWorldPosition(worldPos, worldOrient);

    double vector[3];
    vector[0] = worldPos[0] - ref[0];
    vector[1] = worldPos[1] - ref[1];
    vector[2] = worldPos[2] - ref[2];

    for (int i = 0; i < this->GetNumberOfNodes(); i++)
    {
      if (i != this->ActiveNode)
      {
        this->GetNthNodeWorldPosition(i, ref);
        worldPos[0] = ref[0] + vector[0];
        worldPos[1] = ref[1] + vector[1];
        worldPos[2] = ref[2] + vector[2];
        this->SetNthNodeWorldPosition(i, worldPos, worldOrient);
      }
    }
  }
}
//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::ScaleContour(double eventPos[2])
{
  double ref[3];

  if (!this->GetActiveNodeWorldPosition(ref))
  {
    return;
  }

  double centroid[3];
  ComputeCentroid(centroid);

  double r2 = vtkMath::Distance2BetweenPoints(ref, centroid);

  double displayPos[2];
  displayPos[0] = eventPos[0] + this->InteractionOffset[0];
  displayPos[1] = eventPos[1] + this->InteractionOffset[1];

  double worldPos[3];
  double worldOrient[9] = { 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 };
  if (this->PointPlacer->ComputeWorldPosition(
        this->Renderer, displayPos, ref, worldPos, worldOrient))
  {
    double d2 = vtkMath::Distance2BetweenPoints(worldPos, centroid);
    if (d2 != 0.)
    {
      double ratio = sqrt(d2 / r2);
      //       this->SetActiveNodeToWorldPosition(worldPos, worldOrient);

      for (int i = 0; i < this->GetNumberOfNodes(); i++)
      {
        //         if( i != this->ActiveNode )
        {
          this->GetNthNodeWorldPosition(i, ref);
          worldPos[0] = centroid[0] + ratio * (ref[0] - centroid[0]);
          worldPos[1] = centroid[1] + ratio * (ref[1] - centroid[1]);
          worldPos[2] = centroid[2] + ratio * (ref[2] - centroid[2]);
          this->SetNthNodeWorldPosition(i, worldPos, worldOrient);
        }
      }
    }
  }
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::ComputeCentroid(double* ioCentroid)
{
  double p[3];
  ioCentroid[0] = 0.;
  ioCentroid[1] = 0.;
  ioCentroid[2] = 0.;

  for (int i = 0; i < this->GetNumberOfNodes(); i++)
  {
    this->GetNthNodeWorldPosition(i, p);
    ioCentroid[0] += p[0];
    ioCentroid[1] += p[1];
    ioCentroid[2] += p[2];
  }
  double inv_N = 1. / static_cast<double>(this->GetNumberOfNodes());
  ioCentroid[0] *= inv_N;
  ioCentroid[1] *= inv_N;
  ioCentroid[2] *= inv_N;
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::Scale(double eventPos[2])
{
  // Get the current scale factor
  double sf = this->Glypher->GetScaleFactor();

  // Compute the scale factor
  const int* size = this->Renderer->GetSize();
  double dPos = static_cast<double>(eventPos[1] - this->LastEventPosition[1]);
  sf *= (1.0 + 2.0 * (dPos / size[1])); // scale factor of 2.0 is arbitrary

  // Scale the handle
  this->Glypher->SetScaleFactor(sf);
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::CreateDefaultProperties()
{
  this->Property = vtkProperty2D::New();
  this->Property->SetColor(1.0, 1.0, 1.0);
  this->Property->SetLineWidth(0.5);
  this->Property->SetPointSize(3);

  this->ActiveProperty = vtkProperty2D::New();
  this->ActiveProperty->SetColor(0.0, 1.0, 0.0);
  this->ActiveProperty->SetLineWidth(1.0);

  this->LinesProperty = vtkProperty2D::New();
  this->LinesProperty->SetColor(1, 1, 1);
  this->LinesProperty->SetLineWidth(1);
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::BuildLines()
{
  vtkPoints* points = vtkPoints::New();
  vtkCellArray* lines = vtkCellArray::New();

  int i, j;
  vtkIdType index = 0;

  int count = this->GetNumberOfNodes();
  for (i = 0; i < this->GetNumberOfNodes(); i++)
  {
    count += this->GetNumberOfIntermediatePoints(i);
  }

  points->SetNumberOfPoints(count);
  vtkIdType numLines;

  if (this->ClosedLoop && count > 0)
  {
    numLines = count + 1;
  }
  else
  {
    numLines = count;
  }

  if (numLines > 0)
  {
    vtkIdType* lineIndices = new vtkIdType[numLines];

    double pos[3];
    for (i = 0; i < this->GetNumberOfNodes(); i++)
    {
      // Add the node
      this->GetNthNodeDisplayPosition(i, pos);
      points->InsertPoint(index, pos);
      lineIndices[index] = index;
      index++;

      int numIntermediatePoints = this->GetNumberOfIntermediatePoints(i);

      for (j = 0; j < numIntermediatePoints; j++)
      {
        this->GetIntermediatePointDisplayPosition(i, j, pos);
        points->InsertPoint(index, pos);
        lineIndices[index] = index;
        index++;
      }
    }

    if (this->ClosedLoop)
    {
      lineIndices[index] = 0;
    }

    lines->InsertNextCell(numLines, lineIndices);
    delete[] lineIndices;
  }

  this->Lines->SetPoints(points);
  this->Lines->SetLines(lines);

  points->Delete();
  lines->Delete();
}

//------------------------------------------------------------------------------
// Returns the direction cosines of the plane on which the contour lies
// on in world co-ordinates. This would be the same matrix that would be
// set in vtkImageReslice or vtkImagePlaneWidget if there were a plane
// passing through the contour points. The origin passed here must be the
// origin on the image data under the contour.
vtkMatrix4x4* vtkOrientedGlyphFocalPlaneContourRepresentation ::GetContourPlaneDirectionCosines(
  const double origin[3])
{
  if (this->ContourPlaneDirectionCosines->GetMTime() >= this->Renderer->GetMTime() ||
    this->ContourPlaneDirectionCosines->GetMTime() >= this->Lines->GetMTime())
  {
    return this->ContourPlaneDirectionCosines;
  }

  vtkMatrix4x4::Transpose(this->Renderer->GetActiveCamera()->GetViewTransformMatrix(),
    this->ContourPlaneDirectionCosines);

  double pWorld[4], fp[4];

  this->Renderer->GetActiveCamera()->GetFocalPoint(fp);
  vtkInteractorObserver::ComputeWorldToDisplay(this->Renderer, fp[0], fp[1], fp[2], fp);

  // What point does the origin of the display co-ordinates map to in world
  // co-ordinates with respect to the world co-ordinate origin ?
  vtkInteractorObserver::ComputeDisplayToWorld(this->Renderer, 0.0, 0.0, fp[2], pWorld);
  this->ContourPlaneDirectionCosines->SetElement(0, 3, pWorld[0] - origin[0]);
  this->ContourPlaneDirectionCosines->SetElement(1, 3, pWorld[1] - origin[1]);
  this->ContourPlaneDirectionCosines->SetElement(2, 3, pWorld[2] - origin[2]);

  // Blank out the other side that was a side effect of transposing.
  this->ContourPlaneDirectionCosines->SetElement(3, 0, 0);
  this->ContourPlaneDirectionCosines->SetElement(3, 1, 0);
  this->ContourPlaneDirectionCosines->SetElement(3, 2, 0);

  return this->ContourPlaneDirectionCosines;
}

//------------------------------------------------------------------------------
// Returns the contour representation as polydata in world co-ordinates
// For this class, the contour is overlaid on the focal plane.
//
vtkPolyData* vtkOrientedGlyphFocalPlaneContourRepresentation ::GetContourRepresentationAsPolyData()
{
  // Get the points in this contour as a vtkPolyData.

  vtkPoints* points = vtkPoints::New();
  vtkCellArray* lines = vtkCellArray::New();

  int i, j;
  vtkIdType index = 0;

  int count = this->GetNumberOfNodes();
  for (i = 0; i < this->GetNumberOfNodes(); i++)
  {
    count += this->GetNumberOfIntermediatePoints(i);
  }

  points->SetNumberOfPoints(count);
  vtkIdType numLines;

  if (this->ClosedLoop && count > 0)
  {
    numLines = count + 1;
  }
  else
  {
    numLines = count;
  }

  if (numLines > 0)
  {
    vtkIdType* lineIndices = new vtkIdType[numLines];

    double pos[3];
    for (i = 0; i < this->GetNumberOfNodes(); i++)
    {
      // Add the node
      this->GetNthNodeWorldPosition(i, pos);
      points->InsertPoint(index, pos);
      lineIndices[index] = index;
      index++;

      int numIntermediatePoints = this->GetNumberOfIntermediatePoints(i);

      for (j = 0; j < numIntermediatePoints; j++)
      {
        this->GetIntermediatePointWorldPosition(i, j, pos);
        points->InsertPoint(index, pos);
        lineIndices[index] = index;
        index++;
      }
    }

    if (this->ClosedLoop)
    {
      lineIndices[index] = 0;
    }

    lines->InsertNextCell(numLines, lineIndices);
    delete[] lineIndices;
  }

  this->LinesWorldCoordinates->SetPoints(points);
  this->LinesWorldCoordinates->SetLines(lines);

  points->Delete();
  lines->Delete();

  return this->LinesWorldCoordinates;
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::BuildRepresentation()
{
  // Make sure we are up to date with any changes made in the placer
  this->UpdateContour();

  double p1[4], p2[4];
  this->Renderer->GetActiveCamera()->GetFocalPoint(p1);

  p1[3] = 1.0;
  this->Renderer->SetWorldPoint(p1);
  this->Renderer->WorldToView();
  this->Renderer->GetViewPoint(p1);

  double depth = p1[2];
  double aspect[2];
  this->Renderer->ComputeAspect();
  this->Renderer->GetAspect(aspect);

  p1[0] = -aspect[0];
  p1[1] = -aspect[1];
  this->Renderer->SetViewPoint(p1);
  this->Renderer->ViewToWorld();
  this->Renderer->GetWorldPoint(p1);

  p2[0] = aspect[0];
  p2[1] = aspect[1];
  p2[2] = depth;
  p2[3] = 1.0;
  this->Renderer->SetViewPoint(p2);
  this->Renderer->ViewToWorld();
  this->Renderer->GetWorldPoint(p2);

  double distance = sqrt(vtkMath::Distance2BetweenPoints(p1, p2));

  const int* size = this->Renderer->GetRenderWindow()->GetSize();
  double viewport[4];
  this->Renderer->GetViewport(viewport);

  double x, y, scale;

  x = size[0] * (viewport[2] - viewport[0]);
  y = size[1] * (viewport[3] - viewport[1]);

  scale = sqrt(x * x + y * y);

  distance = 1000 * distance / scale;

  this->Glypher->SetScaleFactor(distance * this->HandleSize);
  this->ActiveGlypher->SetScaleFactor(distance * this->HandleSize);

  int numPoints = this->GetNumberOfNodes();

  if (this->ActiveNode >= 0 && this->ActiveNode < this->GetNumberOfNodes())
  {
    this->FocalPoint->SetNumberOfPoints(numPoints - 1);
    this->FocalData->GetPointData()->GetNormals()->SetNumberOfTuples(numPoints - 1);
  }
  else
  {
    this->FocalPoint->SetNumberOfPoints(numPoints);
    this->FocalData->GetPointData()->GetNormals()->SetNumberOfTuples(numPoints);
  }

  int i;
  int idx = 0;
  for (i = 0; i < numPoints; i++)
  {
    if (i != this->ActiveNode)
    {
      double displayPos[3];
      this->GetNthNodeDisplayPosition(i, displayPos);
      this->FocalPoint->SetPoint(idx, displayPos);
      idx++;
    }
  }

  this->FocalPoint->Modified();
  this->FocalData->GetPointData()->GetNormals()->Modified();
  this->FocalData->Modified();

  if (this->ActiveNode >= 0 && this->ActiveNode < this->GetNumberOfNodes())
  {
    double displayPos[3];
    this->GetNthNodeDisplayPosition(i, displayPos);
    this->ActiveFocalPoint->SetPoint(0, displayPos);

    this->ActiveFocalPoint->Modified();
    this->ActiveFocalData->GetPointData()->GetNormals()->Modified();
    this->ActiveFocalData->Modified();
    this->ActiveActor->VisibilityOn();
  }
  else
  {
    this->ActiveActor->VisibilityOff();
  }
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::GetActors2D(vtkPropCollection* pc)
{
  this->Actor->GetActors2D(pc);
  this->ActiveActor->GetActors2D(pc);
  this->LinesActor->GetActors2D(pc);
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::ReleaseGraphicsResources(vtkWindow* win)
{
  this->Actor->ReleaseGraphicsResources(win);
  this->ActiveActor->ReleaseGraphicsResources(win);
  this->LinesActor->ReleaseGraphicsResources(win);
}

//------------------------------------------------------------------------------
int vtkOrientedGlyphFocalPlaneContourRepresentation::RenderOverlay(vtkViewport* viewport)
{
  int count = 0;
  count += this->LinesActor->RenderOverlay(viewport);
  if (this->Actor->GetVisibility())
  {
    count += this->Actor->RenderOverlay(viewport);
  }
  if (this->ActiveActor->GetVisibility())
  {
    count += this->ActiveActor->RenderOverlay(viewport);
  }
  return count;
}

//------------------------------------------------------------------------------
int vtkOrientedGlyphFocalPlaneContourRepresentation::RenderOpaqueGeometry(vtkViewport* viewport)
{
  // Since we know RenderOpaqueGeometry gets called first, will do the
  // build here
  this->BuildRepresentation();

  int count = this->LinesActor->RenderOpaqueGeometry(viewport);
  if (this->Actor->GetVisibility())
  {
    count += this->Actor->RenderOpaqueGeometry(viewport);
  }
  if (this->ActiveActor->GetVisibility())
  {
    count += this->ActiveActor->RenderOpaqueGeometry(viewport);
  }
  return count;
}

//------------------------------------------------------------------------------
int vtkOrientedGlyphFocalPlaneContourRepresentation::RenderTranslucentPolygonalGeometry(
  vtkViewport* viewport)
{
  int count = this->LinesActor->RenderTranslucentPolygonalGeometry(viewport);
  if (this->Actor->GetVisibility())
  {
    count += this->Actor->RenderTranslucentPolygonalGeometry(viewport);
  }
  if (this->ActiveActor->GetVisibility())
  {
    count += this->ActiveActor->RenderTranslucentPolygonalGeometry(viewport);
  }
  return count;
}

//------------------------------------------------------------------------------
vtkTypeBool vtkOrientedGlyphFocalPlaneContourRepresentation::HasTranslucentPolygonalGeometry()
{
  int result = this->LinesActor->HasTranslucentPolygonalGeometry();
  if (this->Actor->GetVisibility())
  {
    result |= this->Actor->HasTranslucentPolygonalGeometry();
  }
  if (this->ActiveActor->GetVisibility())
  {
    result |= this->ActiveActor->HasTranslucentPolygonalGeometry();
  }
  return result;
}

//------------------------------------------------------------------------------
void vtkOrientedGlyphFocalPlaneContourRepresentation::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);

  os << indent << "InteractionOffset: (" << this->InteractionOffset[0] << ","
     << this->InteractionOffset[1] << ")" << endl;

  if (this->Property)
  {
    os << indent << "Property: " << this->Property << "\n";
  }
  else
  {
    os << indent << "Property: (none)\n";
  }

  if (this->ActiveProperty)
  {
    os << indent << "Active Property: " << this->ActiveProperty << "\n";
  }
  else
  {
    os << indent << "Active Property: (none)\n";
  }

  if (this->LinesProperty)
  {
    os << indent << "Lines Property: " << this->LinesProperty << "\n";
  }
  else
  {
    os << indent << "Lines Property: (none)\n";
  }
}