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

  Program:   Visualization Toolkit
  Module:    vtkSphereRepresentation.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 "vtkSphereRepresentation.h"
#include "vtkActor.h"
#include "vtkActor2D.h"
#include "vtkAssemblyPath.h"
#include "vtkCallbackCommand.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkCellPicker.h"
#include "vtkCursor3D.h"
#include "vtkDoubleArray.h"
#include "vtkInteractorObserver.h"
#include "vtkLineSource.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPickingManager.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkSphere.h"
#include "vtkSphereSource.h"
#include "vtkTextMapper.h"
#include "vtkTextProperty.h"
#include "vtkTransform.h"
#include "vtkWindow.h"

#include <cassert>

vtkStandardNewMacro(vtkSphereRepresentation);

//------------------------------------------------------------------------------
vtkSphereRepresentation::vtkSphereRepresentation()
{
  // The initial state
  this->InteractionState = vtkSphereRepresentation::Outside;

  // Handle size is in pixels for this widget
  this->HandleSize = 10.0;

  // Set up the initial representation
  this->Representation = VTK_SPHERE_WIREFRAME;

  // Set up the initial properties
  this->SphereProperty = nullptr;
  this->SelectedSphereProperty = nullptr;
  this->HandleProperty = nullptr;
  this->SelectedHandleProperty = nullptr;
  this->HandleTextProperty = nullptr;
  this->RadialLineProperty = nullptr;
  this->CreateDefaultProperties();

  // Build the representation of the widget
  // Represent the sphere
  this->SphereSource = vtkSphereSource::New();
  this->SphereSource->SetThetaResolution(16);
  this->SphereSource->SetPhiResolution(8);
  this->SphereSource->LatLongTessellationOn();
  this->SphereMapper = vtkPolyDataMapper::New();
  this->SphereMapper->SetInputConnection(this->SphereSource->GetOutputPort());
  this->SphereActor = vtkActor::New();
  this->SphereActor->SetMapper(this->SphereMapper);

  // the handle
  this->HandleVisibility = 0;
  this->HandleDirection[0] = 1.0;
  this->HandleDirection[1] = 0.0;
  this->HandleDirection[2] = 0.0;
  this->HandleSource = vtkSphereSource::New();
  this->HandleSource->SetThetaResolution(16);
  this->HandleSource->SetPhiResolution(8);
  this->HandleMapper = vtkPolyDataMapper::New();
  this->HandleMapper->SetInputConnection(this->HandleSource->GetOutputPort());
  this->HandleActor = vtkActor::New();
  this->HandleActor->SetMapper(this->HandleMapper);

  // Manage the handle label
  this->HandleText = 1;
  this->HandleTextMapper = vtkTextMapper::New();
  this->HandleTextMapper->SetTextProperty(this->HandleTextProperty);
  this->HandleTextActor = vtkActor2D::New();
  this->HandleTextActor->SetMapper(this->HandleTextMapper);
  this->HandleTextActor->GetPositionCoordinate()->SetCoordinateSystemToDisplay();

  // Manage the radial line segment
  this->RadialLine = 1;
  this->RadialLineSource = vtkLineSource::New();
  this->RadialLineSource->SetResolution(1);
  this->RadialLineMapper = vtkPolyDataMapper::New();
  this->RadialLineMapper->SetInputConnection(this->RadialLineSource->GetOutputPort());
  this->RadialLineActor = vtkActor::New();
  this->RadialLineActor->SetMapper(this->RadialLineMapper);
  this->RadialLineActor->SetProperty(this->RadialLineProperty);

  // Represent the center cursor
  this->CenterCursor = false;
  this->CenterCursorSource = vtkCursor3D::New();
  this->CenterCursorSource->AllOff();
  this->CenterCursorSource->AxesOn();
  this->CenterCursorSource->TranslationModeOn();
  this->CenterMapper = vtkPolyDataMapper::New();
  this->CenterMapper->SetInputConnection(this->CenterCursorSource->GetOutputPort());
  this->CenterActor = vtkActor::New();
  this->CenterActor->SetMapper(this->CenterMapper);

  // Define the point coordinates
  double bounds[6];
  bounds[0] = -0.5;
  bounds[1] = 0.5;
  bounds[2] = -0.5;
  bounds[3] = 0.5;
  bounds[4] = -0.5;
  bounds[5] = 0.5;

  // First creation of the widget, serves to initialize it
  this->PlaceWidget(bounds);

  // Manage the picking stuff
  this->HandlePicker = vtkCellPicker::New();
  this->HandlePicker->SetTolerance(0.005); // need some fluff
  this->HandlePicker->AddPickList(this->HandleActor);
  this->HandlePicker->PickFromListOn();

  this->SpherePicker = vtkCellPicker::New();
  this->SpherePicker->SetTolerance(0.005);
  this->SpherePicker->AddPickList(this->SphereActor);
  this->SpherePicker->PickFromListOn();

  this->SphereActor->SetProperty(this->SphereProperty);
  this->HandleActor->SetProperty(this->HandleProperty);

  this->TranslationAxis = Axis::NONE;
}

//------------------------------------------------------------------------------
vtkSphereRepresentation::~vtkSphereRepresentation()
{
  this->SphereActor->Delete();
  this->SphereMapper->Delete();
  this->SphereSource->Delete();

  this->HandlePicker->Delete();
  this->SpherePicker->Delete();

  this->HandleSource->Delete();
  this->HandleMapper->Delete();
  this->HandleActor->Delete();

  // the handle
  this->HandleTextProperty->Delete();
  this->HandleTextMapper->Delete();
  this->HandleTextActor->Delete();

  // the text
  this->RadialLineProperty->Delete();
  this->RadialLineSource->Delete();
  this->RadialLineMapper->Delete();
  this->RadialLineActor->Delete();

  // The cursor
  this->CenterCursorSource->Delete();
  this->CenterMapper->Delete();
  this->CenterActor->Delete();

  if (this->SphereProperty)
  {
    this->SphereProperty->Delete();
  }
  if (this->SelectedSphereProperty)
  {
    this->SelectedSphereProperty->Delete();
  }
  if (this->HandleProperty)
  {
    this->HandleProperty->Delete();
  }
  if (this->SelectedHandleProperty)
  {
    this->SelectedHandleProperty->Delete();
  }
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::GetPolyData(vtkPolyData* pd)
{
  this->SphereSource->Update();
  pd->ShallowCopy(this->SphereSource->GetOutput());
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::GetSphere(vtkSphere* sphere)
{
  sphere->SetRadius(this->SphereSource->GetRadius());
  sphere->SetCenter(this->SphereSource->GetCenter());
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::HighlightSphere(int highlight)
{
  if (highlight)
  {
    this->ValidPick = 1;
    this->SphereActor->SetProperty(this->SelectedSphereProperty);
  }
  else
  {
    this->SphereActor->SetProperty(this->SphereProperty);
  }
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::HighlightHandle(int highlight)
{
  if (highlight)
  {
    this->ValidPick = 1;
    this->HandleActor->SetProperty(this->SelectedHandleProperty);
  }
  else
  {
    this->HandleActor->SetProperty(this->HandleProperty);
  }
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::RegisterPickers()
{
  vtkPickingManager* pm = this->GetPickingManager();
  if (!pm)
  {
    return;
  }
  pm->AddPicker(this->HandlePicker, this);
  pm->AddPicker(this->SpherePicker, this);
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::Scale(const double* p1, const double* p2, int vtkNotUsed(X), int Y)
{
  // Get the motion vector
  double v[3];
  v[0] = p2[0] - p1[0];
  v[1] = p2[1] - p1[1];
  v[2] = p2[2] - p1[2];

  double radius = this->SphereSource->GetRadius();
  double* c = this->SphereSource->GetCenter();

  // Compute the scale factor
  double sf = vtkMath::Norm(v) / radius;
  if (Y > this->LastEventPosition[1])
  {
    sf = 1.0 + sf;
  }
  else
  {
    sf = 1.0 - sf;
  }

  // Make sure that the radius is valid; don't let it shrink further
  // but it can still grow in radius.
  if (Y <= this->LastEventPosition[1] && sf * radius < 1.0e-06 * this->InitialLength)
  {
    return;
  }

  // Need to prevent radius going to zero
  this->SphereSource->SetRadius(sf * radius);
  this->HandlePosition[0] = c[0] + sf * (this->HandlePosition[0] - c[0]);
  this->HandlePosition[1] = c[1] + sf * (this->HandlePosition[1] - c[1]);
  this->HandlePosition[2] = c[2] + sf * (this->HandlePosition[2] - c[2]);
  this->HandleSource->SetCenter(this->HandlePosition);
  this->AdaptCenterCursorBounds();
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::StartWidgetInteraction(double e[2])
{
  // Store the start position
  this->StartEventPosition[0] = e[0];
  this->StartEventPosition[1] = e[1];
  this->StartEventPosition[2] = 0.0;

  // Store the start position
  this->LastEventPosition[0] = e[0];
  this->LastEventPosition[1] = e[1];
  this->LastEventPosition[2] = 0.0;

  this->ComputeInteractionState(static_cast<int>(e[0]), static_cast<int>(e[1]), 0);
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::WidgetInteraction(double e[2])
{
  // Convert events to appropriate coordinate systems
  vtkCamera* camera = this->Renderer->GetActiveCamera();
  if (!camera)
  {
    return;
  }
  double focalPoint[4], pickPoint[4], prevPickPoint[4];
  double z, vpn[3];
  camera->GetViewPlaneNormal(vpn);

  // Compute the two points defining the motion vector
  vtkInteractorObserver::ComputeWorldToDisplay(this->Renderer, this->LastPickPosition[0],
    this->LastPickPosition[1], this->LastPickPosition[2], focalPoint);
  z = focalPoint[2];
  vtkInteractorObserver::ComputeDisplayToWorld(
    this->Renderer, this->LastEventPosition[0], this->LastEventPosition[1], z, prevPickPoint);
  vtkInteractorObserver::ComputeDisplayToWorld(this->Renderer, e[0], e[1], z, pickPoint);

  // Process the motion
  if (this->InteractionState == vtkSphereRepresentation::Translating)
  {
    this->Translate(prevPickPoint, pickPoint);
  }

  else if (this->InteractionState == vtkSphereRepresentation::Scaling)
  {
    this->Scale(prevPickPoint, pickPoint, static_cast<int>(e[0]), static_cast<int>(e[1]));
  }
  else if (this->InteractionState == vtkSphereRepresentation::MovingHandle)
  {
    vtkAssemblyPath* path = this->GetAssemblyPath(e[0], e[1], 0., this->SpherePicker);

    if (path != nullptr)
    {
      double pos[3], dir[3], c[3];
      this->SpherePicker->GetPickPosition(pos);
      this->SphereSource->GetCenter(c);
      dir[0] = pos[0] - c[0];
      dir[1] = pos[1] - c[1];
      dir[2] = pos[2] - c[2];
      this->SetHandleDirection(dir);
    }
  }

  // Store the position
  this->LastEventPosition[0] = e[0];
  this->LastEventPosition[1] = e[1];
  this->LastEventPosition[2] = 0.0;
}

//------------------------------------------------------------------------------
// Loop through all points and translate them
void vtkSphereRepresentation::Translate(const double* p1, const double* p2)
{
  // Get the motion vector
  double v[3] = { 0, 0, 0 };

  if (!this->IsTranslationConstrained())
  {
    v[0] = p2[0] - p1[0];
    v[1] = p2[1] - p1[1];
    v[2] = p2[2] - p1[2];
  }
  else
  {
    assert(this->TranslationAxis > -1 && this->TranslationAxis < 3 &&
      "this->TranslationAxis out of bounds");
    v[this->TranslationAxis] = p2[this->TranslationAxis] - p1[this->TranslationAxis];
  }

  double* center = this->SphereSource->GetCenter();

  double center1[3];
  for (int i = 0; i < 3; i++)
  {
    center1[i] = center[i] + v[i];
    this->HandlePosition[i] += v[i];
  }

  this->SphereSource->SetCenter(center1);
  this->CenterCursorSource->SetFocalPoint(center1);
  this->HandleSource->SetCenter(HandlePosition);
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::CreateDefaultProperties()
{
  if (!this->SphereProperty)
  {
    this->SphereProperty = vtkProperty::New();
  }
  if (!this->SelectedSphereProperty)
  {
    this->SelectedSphereProperty = vtkProperty::New();
  }

  if (!this->HandleProperty)
  {
    this->HandleProperty = vtkProperty::New();
    this->HandleProperty->SetColor(1, 1, 1);
  }
  if (!this->SelectedHandleProperty)
  {
    this->SelectedHandleProperty = vtkProperty::New();
    this->SelectedHandleProperty->SetColor(1, 0, 0);
  }

  if (!this->HandleTextProperty)
  {
    this->HandleTextProperty = vtkTextProperty::New();
    this->HandleTextProperty->SetFontSize(12);
    this->HandleTextProperty->SetBold(1);
    this->HandleTextProperty->SetItalic(1);
    this->HandleTextProperty->SetShadow(1);
    this->HandleTextProperty->SetFontFamilyToArial();
  }

  if (!this->RadialLineProperty)
  {
    this->RadialLineProperty = vtkProperty::New();
    this->RadialLineProperty->SetColor(1, 0, 0);
  }
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::PlaceWidget(double center[3], double handle[3])
{
  double r = sqrt(vtkMath::Distance2BetweenPoints(center, handle));
  this->SphereSource->SetCenter(center);
  this->SphereSource->SetRadius(r);
  this->SphereSource->Update();

  this->HandlePosition[0] = handle[0];
  this->HandlePosition[1] = handle[1];
  this->HandlePosition[2] = handle[2];
  this->HandleSource->SetCenter(handle);
  this->HandleSource->Update();

  this->CenterCursorSource->SetFocalPoint(center);
  this->CenterCursorSource->Update();

  this->HandleDirection[0] = handle[0] - center[0];
  this->HandleDirection[1] = handle[1] - center[1];
  this->HandleDirection[2] = handle[2] - center[2];

  this->InitialLength = r;
  this->InitialBounds[0] = center[0] - r;
  this->InitialBounds[1] = center[0] + r;
  this->InitialBounds[2] = center[1] - r;
  this->InitialBounds[3] = center[1] + r;
  this->InitialBounds[4] = center[2] - r;
  this->InitialBounds[5] = center[2] + r;

  this->ValidPick = 1;
  this->BuildRepresentation();
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::SetCenter(double center[3])
{
  double c[3];
  this->SphereSource->GetCenter(c);
  if (c[0] != center[0] || c[1] != center[1] || c[2] != center[2])
  {
    double handle[3];
    this->SphereSource->SetCenter(center);

    if (this->GetHandleVisibility())
    {
      this->HandleSource->GetCenter(handle);
      this->HandleDirection[0] = handle[0] - center[0];
      this->HandleDirection[1] = handle[1] - center[1];
      this->HandleDirection[2] = handle[2] - center[2];
      double r = sqrt(static_cast<double>(vtkMath::Distance2BetweenPoints(handle, center)));
      this->SphereSource->SetRadius(r);
    }

    this->SphereSource->Update();

    this->CenterCursorSource->SetFocalPoint(center);
    this->CenterCursorSource->Update();

    this->Modified();
  }
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::SetRadius(double r)
{
  r = (r <= this->InitialLength * 1.0e-04 ? this->InitialLength * 1.0e-04 : r);
  if (r != this->SphereSource->GetRadius())
  {
    double center[3];
    this->SphereSource->SetRadius(r);
    this->SphereSource->GetCenter(center);
    this->PlaceHandle(center, r);
    this->SphereSource->Update();
    this->Modified();
  }
}

//------------------------------------------------------------------------------
// This method may change the radius of the sphere
void vtkSphereRepresentation::SetHandlePosition(double handle[3])
{
  double h[3];
  this->HandleSource->GetCenter(h);
  if (h[0] != handle[0] || h[1] != handle[1] || h[2] != handle[2])
  {
    double c[3];
    this->HandleSource->SetCenter(handle);
    this->SphereSource->GetCenter(c);
    this->HandleDirection[0] = handle[0] - c[0];
    this->HandleDirection[1] = handle[1] - c[1];
    this->HandleDirection[2] = handle[2] - c[2];
    double r = static_cast<double>(vtkMath::Distance2BetweenPoints(handle, c));
    this->SphereSource->SetRadius(sqrt(r));
    this->SphereSource->Update();
    this->HandleSource->Update();
    this->Modified();
  }
}

//------------------------------------------------------------------------------
// This method preserves the radius of the sphere. The handle is repositioned
// on the existing sphere but in the new direction. So the handle will move across
// the surface of the sphere. Note that the HandlePosition[3] data member is
// adjusted to be consistent with the sphere center and the current sphere radius.
void vtkSphereRepresentation::SetHandleDirection(double dir[3])
{
  double* d = this->HandleDirection;
  double dirMag = vtkMath::Norm(dir);
  if ((dirMag != 0.0) && (d[0] != dir[0] || d[1] != dir[1] || d[2] != dir[2]))
  {
    double r, f, c[3];
    r = this->SphereSource->GetRadius();
    f = r / dirMag;
    this->SphereSource->GetCenter(c);
    this->HandlePosition[0] = c[0] + f * dir[0];
    this->HandlePosition[1] = c[1] + f * dir[1];
    this->HandlePosition[2] = c[2] + f * dir[2];
    this->HandleSource->SetCenter(this->HandlePosition);
    this->HandleSource->Update();
    this->Modified();
  }
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::PlaceWidget(double bds[6])
{
  double bounds[6], center[3], radius;

  this->AdjustBounds(bds, bounds, center);

  radius = (bounds[1] - bounds[0]) / 2.0;
  if (radius > ((bounds[3] - bounds[2]) / 2.0))
  {
    radius = (bounds[3] - bounds[2]) / 2.0;
  }
  radius = (bounds[1] - bounds[0]) / 2.0;
  if (radius > ((bounds[5] - bounds[4]) / 2.0))
  {
    radius = (bounds[5] - bounds[4]) / 2.0;
  }

  this->SphereSource->SetCenter(center);
  this->SphereSource->SetRadius(radius);
  this->SphereSource->Update();

  this->CenterCursorSource->SetFocalPoint(center);
  this->CenterCursorSource->Update();

  // place the handle
  this->PlaceHandle(center, radius);

  for (int i = 0; i < 6; i++)
  {
    this->InitialBounds[i] = bounds[i];
  }
  this->InitialLength = sqrt((bounds[1] - bounds[0]) * (bounds[1] - bounds[0]) +
    (bounds[3] - bounds[2]) * (bounds[3] - bounds[2]) +
    (bounds[5] - bounds[4]) * (bounds[5] - bounds[4]));

  this->ValidPick = 1; // since we have set up widget properly
  this->SizeHandles();
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::PlaceHandle(const double* center, double radius)
{
  double sf = radius / vtkMath::Norm(this->HandleDirection);

  this->HandlePosition[0] = center[0] + sf * this->HandleDirection[0];
  this->HandlePosition[1] = center[1] + sf * this->HandleDirection[1];
  this->HandlePosition[2] = center[2] + sf * this->HandleDirection[2];
  this->HandleSource->SetCenter(this->HandlePosition);
  this->HandleSource->Update();
}

//------------------------------------------------------------------------------
int vtkSphereRepresentation::ComputeInteractionState(int X, int Y, int vtkNotUsed(modify))
{
  // Okay, we can process this. Try to pick handles first;
  // if no handles picked, then pick the bounding box.
  this->InteractionState = vtkSphereRepresentation::Outside;
  if (!this->Renderer || !this->Renderer->IsInViewport(X, Y))
  {
    return this->InteractionState;
  }

  // Try and pick a handle first. This allows the picking of the handle even
  // if it is "behind" the sphere.
  vtkAssemblyPath* path;
  int handlePicked = 0;
  if (this->HandleVisibility || this->HandleText || this->RadialLine)
  {
    path = this->GetAssemblyPath(X, Y, 0., this->HandlePicker);

    if (path != nullptr)
    {
      this->ValidPick = 1;
      this->InteractionState = vtkSphereRepresentation::MovingHandle;
      this->HandleSource->GetCenter(this->LastPickPosition);
      this->HandleSource->GetCenter(this->HandlePosition);
      handlePicked = 1;
    }
  }

  if (!handlePicked)
  {
    path = this->GetAssemblyPath(X, Y, 0., this->SpherePicker);

    if (path != nullptr)
    {
      this->ValidPick = 1;
      this->InteractionState = vtkSphereRepresentation::OnSphere;
      this->SpherePicker->GetPickPosition(this->LastPickPosition);
    }
  }

  return this->InteractionState;
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::AdaptCenterCursorBounds()
{
  double center[3], newBounds[6];
  this->CenterCursorSource->GetFocalPoint(center);
  double radius = this->SizeHandlesInPixels(2.0, center);
  for (int i = 0; i < 3; i++)
  {
    newBounds[2 * i] = center[i] - radius;
    newBounds[2 * i + 1] = center[i] + radius;
  }
  this->CenterCursorSource->SetModelBounds(newBounds);
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::SetInteractionState(int state)
{
  // Clamp to allowable values
  state = (state < vtkSphereRepresentation::Outside
      ? vtkSphereRepresentation::Outside
      : (state > vtkSphereRepresentation::Scaling ? vtkSphereRepresentation::Scaling : state));

  // Depending on state, highlight appropriate parts of representation
  this->InteractionState = state;
}

//------------------------------------------------------------------------------
double* vtkSphereRepresentation::GetBounds()
{
  this->BuildRepresentation();
  return this->SphereSource->GetOutput()->GetBounds();
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::BuildRepresentation()
{
  // Always rebuild, it's not worth keeping track of modified
  switch (this->Representation)
  {
    case VTK_SPHERE_OFF:
      break;
    case VTK_SPHERE_WIREFRAME:
      this->SphereProperty->SetRepresentationToWireframe();
      this->SelectedSphereProperty->SetRepresentationToWireframe();
      break;
    case VTK_SPHERE_SURFACE:
      this->SphereProperty->SetRepresentationToSurface();
      this->SelectedSphereProperty->SetRepresentationToSurface();
      break;
  }
  this->SphereSource->Update();
  this->SizeHandles();

  // Now the annotations
  if (this->RadialLine)
  {
    this->RadialLineSource->SetPoint1(this->SphereSource->GetCenter());
    this->RadialLineSource->SetPoint2(this->HandleSource->GetCenter());
    this->RadialLineSource->Update();
  }

  if (this->HandleText && this->Renderer)
  {
    char str[256];
    double c[3], hc[3], tc[4];
    this->SphereSource->GetCenter(c);
    this->HandleSource->GetCenter(hc);
    double r = sqrt(static_cast<double>(vtkMath::Distance2BetweenPoints(c, hc)));
    r = (r <= 0.0 ? 1.0 : r);
    double theta = vtkMath::DegreesFromRadians(atan2((hc[1] - c[1]), (hc[0] - c[0])));
    double phi = vtkMath::DegreesFromRadians(acos((hc[2] - c[2]) / r));
    snprintf(str, sizeof(str), "(%0.2g, %1.1f, %1.1f)", r, theta, phi);
    this->HandleTextMapper->SetInput(str);
    vtkInteractorObserver::ComputeWorldToDisplay(this->Renderer, hc[0], hc[1], hc[2], tc);
    this->HandleTextActor->GetPositionCoordinate()->SetValue(tc[0] + 10, tc[1] + 10);
  }
  this->AdaptCenterCursorBounds();
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::ReleaseGraphicsResources(vtkWindow* w)
{
  this->SphereActor->ReleaseGraphicsResources(w);
  this->HandleActor->ReleaseGraphicsResources(w);
  this->HandleTextActor->ReleaseGraphicsResources(w);
  this->RadialLineActor->ReleaseGraphicsResources(w);
  this->CenterActor->ReleaseGraphicsResources(w);
}

//------------------------------------------------------------------------------
int vtkSphereRepresentation::RenderOpaqueGeometry(vtkViewport* v)
{
  int count = 0;
  this->BuildRepresentation();

  if (this->Representation != VTK_SPHERE_OFF)
  {
    count += this->SphereActor->RenderOpaqueGeometry(v);
  }
  if (this->HandleVisibility)
  {
    count += this->HandleActor->RenderOpaqueGeometry(v);
  }
  if (this->RadialLine)
  {
    count += this->RadialLineActor->RenderOpaqueGeometry(v);
  }
  if (this->CenterCursor)
  {
    count += this->CenterActor->RenderOpaqueGeometry(v);
  }

  return count;
}

//------------------------------------------------------------------------------
int vtkSphereRepresentation::RenderTranslucentPolygonalGeometry(vtkViewport* v)
{
  int count = 0;

  if (this->Representation != VTK_SPHERE_OFF)
  {
    count += this->SphereActor->RenderTranslucentPolygonalGeometry(v);
  }
  if (this->HandleVisibility)
  {
    count += this->HandleActor->RenderTranslucentPolygonalGeometry(v);
  }
  if (this->RadialLine)
  {
    count += this->RadialLineActor->RenderTranslucentPolygonalGeometry(v);
  }
  if (this->CenterCursor)
  {
    count += this->CenterActor->RenderTranslucentPolygonalGeometry(v);
  }

  return count;
}

//------------------------------------------------------------------------------
int vtkSphereRepresentation::RenderOverlay(vtkViewport* v)
{
  int count = 0;

  if (this->HandleText)
  {
    count += this->HandleTextActor->RenderOverlay(v);
  }

  return count;
}

//------------------------------------------------------------------------------
vtkTypeBool vtkSphereRepresentation::HasTranslucentPolygonalGeometry()
{
  int result = 0;
  this->BuildRepresentation();

  if (this->Representation != VTK_SPHERE_OFF)
  {
    result |= this->SphereActor->HasTranslucentPolygonalGeometry();
  }
  if (this->HandleVisibility)
  {
    result |= this->HandleActor->HasTranslucentPolygonalGeometry();
  }
  if (this->HandleText)
  {
    result |= this->HandleTextActor->HasTranslucentPolygonalGeometry();
  }
  if (this->RadialLine)
  {
    result |= this->RadialLineActor->HasTranslucentPolygonalGeometry();
  }
  if (this->CenterCursor)
  {
    result |= this->CenterActor->HasTranslucentPolygonalGeometry();
  }

  return result;
}

//------------------------------------------------------------------------------
void vtkSphereRepresentation::SizeHandles()
{
  double radius = this->vtkWidgetRepresentation::SizeHandlesInPixels(
    1.5, this->HandleSource->GetOutput()->GetCenter());
  this->HandleSource->SetRadius(radius);
}

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

  os << indent << "Sphere Representation: ";
  if (this->Representation == VTK_SPHERE_OFF)
  {
    os << "Off\n";
  }
  else if (this->Representation == VTK_SPHERE_WIREFRAME)
  {
    os << "Wireframe\n";
  }
  else // if ( this->Representation == VTK_SPHERE_SURFACE )
  {
    os << "Surface\n";
  }

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

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

  os << indent << "Handle Visibility: " << (this->HandleVisibility ? "On\n" : "Off\n");
  os << indent << "Handle Direction: (" << this->HandleDirection[0] << ", "
     << this->HandleDirection[1] << ", " << this->HandleDirection[2] << ")\n";
  os << indent << "Handle Position: (" << this->HandlePosition[0] << ", " << this->HandlePosition[1]
     << ", " << this->HandlePosition[2] << ")\n";

  int thetaRes = this->SphereSource->GetThetaResolution();
  int phiRes = this->SphereSource->GetPhiResolution();
  double* center = this->SphereSource->GetCenter();
  double r = this->SphereSource->GetRadius();

  os << indent << "Theta Resolution: " << thetaRes << "\n";
  os << indent << "Phi Resolution: " << phiRes << "\n";
  os << indent << "Center: (" << center[0] << ", " << center[1] << ", " << center[2] << ")\n";
  os << indent << "Radius: " << r << "\n";

  os << indent << "Handle Text: " << this->HandleText << "\n";
  os << indent << "Radial Line: " << this->RadialLine << "\n";
  os << indent << "Center Cursor: " << this->CenterCursor << "\n";

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

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