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

  Program:   Visualization Toolkit
  Module:    vtkCubeAxesActor2D.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 "vtkCubeAxesActor2D.h"

#include "vtkAxisActor2D.h"
#include "vtkCamera.h"
#include "vtkDataSet.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkTextProperty.h"
#include "vtkTrivialProducer.h"
#include "vtkViewport.h"

vtkStandardNewMacro(vtkCubeAxesActor2D);

vtkCxxSetObjectMacro(vtkCubeAxesActor2D, Camera, vtkCamera);
vtkCxxSetObjectMacro(vtkCubeAxesActor2D, ViewProp, vtkProp);
vtkCxxSetObjectMacro(vtkCubeAxesActor2D, AxisLabelTextProperty, vtkTextProperty);
vtkCxxSetObjectMacro(vtkCubeAxesActor2D, AxisTitleTextProperty, vtkTextProperty);

class vtkCubeAxesActor2DConnection : public vtkAlgorithm
{
public:
  static vtkCubeAxesActor2DConnection* New();
  vtkTypeMacro(vtkCubeAxesActor2DConnection, vtkAlgorithm);

  vtkCubeAxesActor2DConnection() { this->SetNumberOfInputPorts(1); }
};

vtkStandardNewMacro(vtkCubeAxesActor2DConnection);

//------------------------------------------------------------------------------
// Instantiate this object.
vtkCubeAxesActor2D::vtkCubeAxesActor2D()
{
  this->ConnectionHolder = vtkCubeAxesActor2DConnection::New();

  this->ViewProp = nullptr;
  this->Bounds[0] = -1.0;
  this->Bounds[1] = 1.0;
  this->Bounds[2] = -1.0;
  this->Bounds[3] = 1.0;
  this->Bounds[4] = -1.0;
  this->Bounds[5] = 1.0;

  this->UseRanges = 0;
  this->Ranges[0] = 0;
  this->Ranges[1] = 0;
  this->Ranges[2] = 0;
  this->Ranges[3] = 0;
  this->Ranges[4] = 0;
  this->Ranges[5] = 0;

  this->Camera = nullptr;
  this->FlyMode = VTK_FLY_CLOSEST_TRIAD;
  this->Scaling = 1;

  this->XAxis = vtkAxisActor2D::New();
  this->XAxis->GetPositionCoordinate()->SetCoordinateSystemToDisplay();
  this->XAxis->GetPosition2Coordinate()->SetCoordinateSystemToDisplay();
  this->XAxis->AdjustLabelsOff();

  this->YAxis = vtkAxisActor2D::New();
  this->YAxis->GetPositionCoordinate()->SetCoordinateSystemToDisplay();
  this->YAxis->GetPosition2Coordinate()->SetCoordinateSystemToDisplay();
  this->YAxis->AdjustLabelsOff();

  this->ZAxis = vtkAxisActor2D::New();
  this->ZAxis->GetPositionCoordinate()->SetCoordinateSystemToDisplay();
  this->ZAxis->GetPosition2Coordinate()->SetCoordinateSystemToDisplay();
  this->ZAxis->AdjustLabelsOff();

  this->NumberOfLabels = 3;

  this->AxisLabelTextProperty = vtkTextProperty::New();
  this->AxisLabelTextProperty->SetBold(1);
  this->AxisLabelTextProperty->SetItalic(1);
  this->AxisLabelTextProperty->SetShadow(1);
  this->AxisLabelTextProperty->SetFontFamilyToArial();

  this->AxisTitleTextProperty = vtkTextProperty::New();
  this->AxisTitleTextProperty->ShallowCopy(this->AxisLabelTextProperty);

  this->LabelFormat = new char[8];
  snprintf(this->LabelFormat, 8, "%s", "%-#6.3g");
  this->FontFactor = 1.0;
  this->CornerOffset = 0.05;
  this->Inertia = 1;
  this->ShowActualBounds = 1;
  this->RenderCount = 0;

  this->XAxisVisibility = 1;
  this->YAxisVisibility = 1;
  this->ZAxisVisibility = 1;

  this->XLabel = new char[2];
  snprintf(this->XLabel, 2, "%s", "X");
  this->YLabel = new char[2];
  snprintf(this->YLabel, 2, "%s", "Y");
  this->ZLabel = new char[2];
  snprintf(this->ZLabel, 2, "%s", "Z");

  // Allow the user to specify an origin for the axes. The axes will then run
  // from this origin to the bounds and will cross over at this origin.
  this->XOrigin = VTK_DOUBLE_MAX;
  this->YOrigin = VTK_DOUBLE_MAX;
  this->ZOrigin = VTK_DOUBLE_MAX;
}

//------------------------------------------------------------------------------
// Shallow copy of an actor.
void vtkCubeAxesActor2D::ShallowCopy(vtkCubeAxesActor2D* actor)
{
  this->vtkActor2D::ShallowCopy(actor);
  this->SetAxisLabelTextProperty(actor->GetAxisLabelTextProperty());
  this->SetAxisTitleTextProperty(actor->GetAxisTitleTextProperty());
  this->SetLabelFormat(actor->GetLabelFormat());
  this->SetFontFactor(actor->GetFontFactor());
  this->SetCornerOffset(actor->GetCornerOffset());
  this->SetInertia(static_cast<int>(actor->GetInertia()));
  this->SetXLabel(actor->GetXLabel());
  this->SetYLabel(actor->GetYLabel());
  this->SetZLabel(actor->GetZLabel());
  this->SetFlyMode(actor->GetFlyMode());
  this->SetInputConnection(actor->ConnectionHolder->GetInputConnection(0, 0));
  this->SetViewProp(actor->GetViewProp());
  this->SetCamera(actor->GetCamera());
}

//------------------------------------------------------------------------------
vtkCubeAxesActor2D::~vtkCubeAxesActor2D()
{
  this->ConnectionHolder->Delete();

  if (this->ViewProp)
  {
    this->ViewProp->Delete();
  }

  if (this->Camera)
  {
    this->Camera->UnRegister(this);
  }

  this->XAxis->Delete();
  this->YAxis->Delete();
  this->ZAxis->Delete();

  delete[] this->LabelFormat;
  this->LabelFormat = nullptr;

  delete[] this->XLabel;
  delete[] this->YLabel;
  delete[] this->ZLabel;

  this->SetAxisLabelTextProperty(nullptr);
  this->SetAxisTitleTextProperty(nullptr);
}

//------------------------------------------------------------------------------
void vtkCubeAxesActor2D::SetInputConnection(vtkAlgorithmOutput* ao)
{
  this->ConnectionHolder->SetInputConnection(ao);
}

//------------------------------------------------------------------------------
void vtkCubeAxesActor2D::SetInputData(vtkDataSet* ds)
{
  vtkTrivialProducer* tp = vtkTrivialProducer::New();
  tp->SetOutput(ds);
  this->SetInputConnection(tp->GetOutputPort());
  tp->Delete();
}

//------------------------------------------------------------------------------
vtkDataSet* vtkCubeAxesActor2D::GetInput()
{
  return vtkDataSet::SafeDownCast(this->ConnectionHolder->GetInputDataObject(0, 0));
}

//------------------------------------------------------------------------------
// Static variable describes connections in cube.
static int Conn[8][3] = { { 1, 2, 4 }, { 0, 3, 5 }, { 3, 0, 6 }, { 2, 1, 7 }, { 5, 6, 0 },
  { 4, 7, 1 }, { 7, 4, 2 }, { 6, 5, 3 } };

//------------------------------------------------------------------------------
// Project the bounding box and compute edges on the border of the bounding
// cube. Determine which parts of the edges are visible via intersection
// with the boundary of the viewport (minus borders).
int vtkCubeAxesActor2D::RenderOverlay(vtkViewport* viewport)
{
  int renderedSomething = 0;

  // Initialization
  if (!this->RenderSomething)
  {
    return 0;
  }

  // Render the axes
  if (this->XAxisVisibility)
  {
    renderedSomething += this->XAxis->RenderOverlay(viewport);
  }
  if (this->YAxisVisibility)
  {
    renderedSomething += this->YAxis->RenderOverlay(viewport);
  }
  if (this->ZAxisVisibility)
  {
    renderedSomething += this->ZAxis->RenderOverlay(viewport);
  }

  return renderedSomething;
}

//------------------------------------------------------------------------------
// Project the bounding box and compute edges on the border of the bounding
// cube. Determine which parts of the edges are visible via intersection
// with the boundary of the viewport (minus borders).
int vtkCubeAxesActor2D::RenderOpaqueGeometry(vtkViewport* viewport)
{
  double bounds[6];
  double slope = 0.0, minSlope, num, den;
  double pts[8][3], d2, d2Min, min;
  int i, idx = 0;
  int xIdx = 0, yIdx = 0, zIdx = 0, zIdx2 = 0, renderedSomething = 0;
  int xAxes = 0, yAxes = 0, zAxes = 0;

  // Initialization
  if (!this->Camera)
  {
    vtkErrorMacro(<< "No camera!");
    this->RenderSomething = 0;
    return 0;
  }

  this->RenderSomething = 1;

  // determine the bounds to use
  this->GetBounds(bounds);

  // Check for user specified origins. By default, these are placed at a corner of the
  // bounding box of the dataset (corner is based on the fly mode)
  if (this->XOrigin != VTK_DOUBLE_MAX)
  {
    bounds[0] = this->XOrigin;
  }
  if (this->YOrigin != VTK_DOUBLE_MAX)
  {
    bounds[2] = this->YOrigin;
  }
  if (this->ZOrigin != VTK_DOUBLE_MAX)
  {
    bounds[4] = this->ZOrigin;
  }

  // Build the axes (almost always needed so we don't check mtime)
  // Transform all points into display coordinates
  this->TransformBounds(viewport, bounds, pts);

  // Find the portion of the bounding box that fits within the viewport,
  if (!this->ShowActualBounds && (this->ClipBounds(viewport, pts, bounds) == 0))
  {
    this->RenderSomething = 0;
    return 0;
  }

  // Take into account the inertia. Process only so often.
  if (this->RenderCount++ == 0 || !(this->RenderCount % this->Inertia))
  {
    // Okay, we have a bounding box, maybe clipped and scaled, that is visible.
    // We setup the axes depending on the fly mode.
    if (this->FlyMode == VTK_FLY_NONE)
    {
      idx = 2; // Just use the default axis orientation.
      xAxes = 0;
      xIdx = Conn[idx][0];
      yAxes = 1;
      yIdx = Conn[idx][1];
      zAxes = 2;
      zIdx = idx;
      zIdx2 = Conn[idx][2];
    }
    else if (this->FlyMode == VTK_FLY_CLOSEST_TRIAD)
    {
      // Loop over points and find the closest point to the camera
      min = VTK_DOUBLE_MAX;
      for (i = 0; i < 8; i++)
      {
        if (pts[i][2] < min)
        {
          idx = i;
          min = pts[i][2];
        }
      }

      // Setup the three axes to be drawn
      xAxes = 0;
      xIdx = Conn[idx][0];
      yAxes = 1;
      yIdx = Conn[idx][1];
      zAxes = 2;
      zIdx = idx;
      zIdx2 = Conn[idx][2];
    }
    else if (this->FlyMode == VTK_FLY_OUTER_EDGES)
    {
      double e1[2], e2[2], e3[2];

      // Find distance to origin
      d2Min = VTK_DOUBLE_MAX;
      for (i = 0; i < 8; i++)
      {
        d2 = pts[i][0] * pts[i][0] + pts[i][1] * pts[i][1];
        if (d2 < d2Min)
        {
          d2Min = d2;
          idx = i;
        }
      }

      // find minimum slope point connected to closest point and on
      // right side (in projected coordinates). This is the first edge.
      minSlope = VTK_DOUBLE_MAX;
      for (xIdx = 0, i = 0; i < 3; i++)
      {
        num = (pts[Conn[idx][i]][1] - pts[idx][1]);
        den = (pts[Conn[idx][i]][0] - pts[idx][0]);
        if (den != 0.0)
        {
          slope = num / den;
        }
        if (slope < minSlope && den > 0)
        {
          xIdx = Conn[idx][i];
          yIdx = Conn[idx][(i + 1) % 3];
          zIdx = Conn[idx][(i + 2) % 3];
          xAxes = i;
          minSlope = slope;
        }
      }

      // find edge (connected to closest point) on opposite side
      for (i = 0; i < 2; i++)
      {
        e1[i] = (pts[xIdx][i] - pts[idx][i]);
        e2[i] = (pts[yIdx][i] - pts[idx][i]);
        e3[i] = (pts[zIdx][i] - pts[idx][i]);
      }
      vtkMath::Normalize2D(e1);
      vtkMath::Normalize2D(e2);
      vtkMath::Normalize2D(e3);

      if (vtkMath::Dot2D(e1, e2) < vtkMath::Dot2D(e1, e3))
      {
        yAxes = (xAxes + 1) % 3;
      }
      else
      {
        yIdx = zIdx;
        yAxes = (xAxes + 2) % 3;
      }

      // Find the final point by determining which global x-y-z axes have not
      // been represented, and then determine the point closest to the viewer.
      zAxes = (xAxes != 0 && yAxes != 0 ? 0 : (xAxes != 1 && yAxes != 1 ? 1 : 2));
      if (pts[Conn[xIdx][zAxes]][2] < pts[Conn[yIdx][zAxes]][2])
      {
        zIdx = xIdx;
        zIdx2 = Conn[xIdx][zAxes];
      }
      else
      {
        zIdx = yIdx;
        zIdx2 = Conn[yIdx][zAxes];
      }
    } // else boundary edges fly mode
    this->InertiaAxes[0] = idx;
    this->InertiaAxes[1] = xIdx;
    this->InertiaAxes[2] = yIdx;
    this->InertiaAxes[3] = zIdx;
    this->InertiaAxes[4] = zIdx2;
    this->InertiaAxes[5] = xAxes;
    this->InertiaAxes[6] = yAxes;
    this->InertiaAxes[7] = zAxes;
  } // inertia
  else
  {
    idx = this->InertiaAxes[0];
    xIdx = this->InertiaAxes[1];
    yIdx = this->InertiaAxes[2];
    zIdx = this->InertiaAxes[3];
    zIdx2 = this->InertiaAxes[4];
    xAxes = this->InertiaAxes[5];
    yAxes = this->InertiaAxes[6];
    zAxes = this->InertiaAxes[7];
  }

  // Setup the axes for plotting
  double xCoords[4], yCoords[4], zCoords[4], xRange[2], yRange[2], zRange[2];
  this->AdjustAxes(pts, bounds, idx, xIdx, yIdx, zIdx, zIdx2, xAxes, yAxes, zAxes, xCoords, yCoords,
    zCoords, xRange, yRange, zRange);

  // Sorry for ugly hack. I find the fonts slightly too large on the axis. BNW
  double AxisFontFactor = this->FontFactor * .75;

  // Update axes
  this->Labels[0] = this->XLabel;
  this->Labels[1] = this->YLabel;
  this->Labels[2] = this->ZLabel;

  this->XAxis->GetPositionCoordinate()->SetValue(xCoords[0], xCoords[1]);
  this->XAxis->GetPosition2Coordinate()->SetValue(xCoords[2], xCoords[3]);
  this->XAxis->SetRange(xRange[0], xRange[1]);
  this->XAxis->SetTitle(this->Labels[xAxes]);
  this->XAxis->SetNumberOfLabels(this->NumberOfLabels);
  this->XAxis->SetLabelFormat(this->LabelFormat);
  this->XAxis->SetFontFactor(AxisFontFactor);
  this->XAxis->SetProperty(this->GetProperty());

  this->YAxis->GetPositionCoordinate()->SetValue(yCoords[2], yCoords[3]);
  this->YAxis->GetPosition2Coordinate()->SetValue(yCoords[0], yCoords[1]);
  this->YAxis->SetRange(yRange[1], yRange[0]);
  this->YAxis->SetTitle(this->Labels[yAxes]);
  this->YAxis->SetNumberOfLabels(this->NumberOfLabels);
  this->YAxis->SetLabelFormat(this->LabelFormat);
  this->YAxis->SetFontFactor(AxisFontFactor);
  this->YAxis->SetProperty(this->GetProperty());

  this->ZAxis->GetPositionCoordinate()->SetValue(zCoords[0], zCoords[1]);
  this->ZAxis->GetPosition2Coordinate()->SetValue(zCoords[2], zCoords[3]);
  this->ZAxis->SetRange(zRange[0], zRange[1]);
  this->ZAxis->SetTitle(this->Labels[zAxes]);
  this->ZAxis->SetNumberOfLabels(this->NumberOfLabels);
  this->ZAxis->SetLabelFormat(this->LabelFormat);
  this->ZAxis->SetFontFactor(AxisFontFactor);
  this->ZAxis->SetProperty(this->GetProperty());

  // Rebuid text props
  // Perform shallow copy here since each individual axis can be
  // accessed through the class API (i.e. each individual axis text prop
  // can be changed). Therefore, we can not just assign pointers otherwise
  // each individual axis text prop would point to the same text prop.

  if (this->AxisLabelTextProperty && this->AxisLabelTextProperty->GetMTime() > this->BuildTime)
  {
    if (this->XAxis->GetLabelTextProperty())
    {
      this->XAxis->GetLabelTextProperty()->ShallowCopy(this->AxisLabelTextProperty);
    }
    if (this->YAxis->GetLabelTextProperty())
    {
      this->YAxis->GetLabelTextProperty()->ShallowCopy(this->AxisLabelTextProperty);
    }
    if (this->ZAxis->GetLabelTextProperty())
    {
      this->ZAxis->GetLabelTextProperty()->ShallowCopy(this->AxisLabelTextProperty);
    }
  }

  if (this->AxisTitleTextProperty && this->AxisTitleTextProperty->GetMTime() > this->BuildTime)
  {
    if (this->XAxis->GetLabelTextProperty())
    {
      this->XAxis->GetTitleTextProperty()->ShallowCopy(this->AxisTitleTextProperty);
    }
    if (this->YAxis->GetLabelTextProperty())
    {
      this->YAxis->GetTitleTextProperty()->ShallowCopy(this->AxisTitleTextProperty);
    }
    if (this->ZAxis->GetLabelTextProperty())
    {
      this->ZAxis->GetTitleTextProperty()->ShallowCopy(this->AxisTitleTextProperty);
    }
  }

  this->BuildTime.Modified();

  // Render the axes
  if (this->XAxisVisibility)
  {
    renderedSomething += this->XAxis->RenderOpaqueGeometry(viewport);
  }
  if (this->YAxisVisibility)
  {
    renderedSomething += this->YAxis->RenderOpaqueGeometry(viewport);
  }
  if (this->ZAxisVisibility)
  {
    renderedSomething += this->ZAxis->RenderOpaqueGeometry(viewport);
  }

  return renderedSomething;
}

//------------------------------------------------------------------------------
// Description:
// Does this prop have some translucent polygonal geometry?
vtkTypeBool vtkCubeAxesActor2D::HasTranslucentPolygonalGeometry()
{
  return 0;
}

//------------------------------------------------------------------------------
// Do final adjustment of axes to control offset, etc.
void vtkCubeAxesActor2D::AdjustAxes(double pts[8][3], double bounds[6], int idx, int xIdx, int yIdx,
  int zIdx, int zIdx2, int xAxes, int yAxes, int zAxes, double xCoords[4], double yCoords[4],
  double zCoords[4], double xRange[2], double yRange[2], double zRange[2])
{
  double* internal_bounds;
  if (this->UseRanges)
  {
    internal_bounds = this->Ranges;
  }
  else
  {
    internal_bounds = bounds;
  }

  // The x-axis
  xCoords[0] = pts[idx][0];
  xCoords[1] = pts[idx][1];
  xCoords[2] = pts[xIdx][0];
  xCoords[3] = pts[xIdx][1];
  if (idx < xIdx)
  {
    xRange[0] = internal_bounds[2 * xAxes];
    xRange[1] = internal_bounds[2 * xAxes + 1];
  }
  else
  {
    xRange[0] = internal_bounds[2 * xAxes + 1];
    xRange[1] = internal_bounds[2 * xAxes];
  }

  // The y-axis
  yCoords[0] = pts[idx][0];
  yCoords[1] = pts[idx][1];
  yCoords[2] = pts[yIdx][0];
  yCoords[3] = pts[yIdx][1];
  if (idx < yIdx)
  {
    yRange[0] = internal_bounds[2 * yAxes];
    yRange[1] = internal_bounds[2 * yAxes + 1];
  }
  else
  {
    yRange[0] = internal_bounds[2 * yAxes + 1];
    yRange[1] = internal_bounds[2 * yAxes];
  }

  // The z-axis
  if (zIdx != xIdx && zIdx != idx) // rearrange for labels
  {
    zIdx = zIdx2;
    zIdx2 = yIdx;
  }

  zCoords[0] = pts[zIdx][0];
  zCoords[1] = pts[zIdx][1];
  zCoords[2] = pts[zIdx2][0];
  zCoords[3] = pts[zIdx2][1];
  if (zIdx < zIdx2)
  {
    zRange[0] = internal_bounds[2 * zAxes];
    zRange[1] = internal_bounds[2 * zAxes + 1];
  }
  else
  {
    zRange[0] = internal_bounds[2 * zAxes + 1];
    zRange[1] = internal_bounds[2 * zAxes];
  }

  // Pull back the corners if specified
  if (this->CornerOffset > 0.0)
  {
    double ave;

    // x-axis
    ave = (xCoords[0] + xCoords[2]) / 2.0;
    xCoords[0] = xCoords[0] - this->CornerOffset * (xCoords[0] - ave);
    xCoords[2] = xCoords[2] - this->CornerOffset * (xCoords[2] - ave);

    ave = (xCoords[1] + xCoords[3]) / 2.0;
    xCoords[1] = xCoords[1] - this->CornerOffset * (xCoords[1] - ave);
    xCoords[3] = xCoords[3] - this->CornerOffset * (xCoords[3] - ave);

    ave = (xRange[1] + xRange[0]) / 2.0;
    if (!this->ShowActualBounds)
    {
      xRange[0] = xRange[0] - this->CornerOffset * (xRange[0] - ave);
      xRange[1] = xRange[1] - this->CornerOffset * (xRange[1] - ave);
    }

    // y-axis
    ave = (yCoords[0] + yCoords[2]) / 2.0;
    yCoords[0] = yCoords[0] - this->CornerOffset * (yCoords[0] - ave);
    yCoords[2] = yCoords[2] - this->CornerOffset * (yCoords[2] - ave);

    ave = (yCoords[1] + yCoords[3]) / 2.0;
    yCoords[1] = yCoords[1] - this->CornerOffset * (yCoords[1] - ave);
    yCoords[3] = yCoords[3] - this->CornerOffset * (yCoords[3] - ave);

    ave = (yRange[1] + yRange[0]) / 2.0;
    if (!this->ShowActualBounds)
    {
      yRange[0] = yRange[0] - this->CornerOffset * (yRange[0] - ave);
      yRange[1] = yRange[1] - this->CornerOffset * (yRange[1] - ave);
    }

    // z-axis
    ave = (zCoords[0] + zCoords[2]) / 2.0;
    zCoords[0] = zCoords[0] - this->CornerOffset * (zCoords[0] - ave);
    zCoords[2] = zCoords[2] - this->CornerOffset * (zCoords[2] - ave);

    ave = (zCoords[1] + zCoords[3]) / 2.0;
    zCoords[1] = zCoords[1] - this->CornerOffset * (zCoords[1] - ave);
    zCoords[3] = zCoords[3] - this->CornerOffset * (zCoords[3] - ave);

    ave = (zRange[1] + zRange[0]) / 2.0;
    if (!this->ShowActualBounds)
    {
      zRange[0] = zRange[0] - this->CornerOffset * (zRange[0] - ave);
      zRange[1] = zRange[1] - this->CornerOffset * (zRange[1] - ave);
    }
  }
}

//------------------------------------------------------------------------------
// Release any graphics resources that are being consumed by this actor.
// The parameter window could be used to determine which graphic
// resources to release.
void vtkCubeAxesActor2D::ReleaseGraphicsResources(vtkWindow* win)
{
  this->XAxis->ReleaseGraphicsResources(win);
  this->YAxis->ReleaseGraphicsResources(win);
  this->ZAxis->ReleaseGraphicsResources(win);
}

//------------------------------------------------------------------------------
// Return the ranges
void vtkCubeAxesActor2D::GetRanges(double ranges[6])
{
  int i;
  for (i = 0; i < 6; i++)
  {
    ranges[i] = this->Ranges[i];
  }
}

//------------------------------------------------------------------------------
// Compute the ranges
void vtkCubeAxesActor2D::GetRanges(
  double& xmin, double& xmax, double& ymin, double& ymax, double& zmin, double& zmax)
{
  double ranges[6];
  this->GetRanges(ranges);
  xmin = ranges[0];
  xmax = ranges[1];
  ymin = ranges[2];
  ymax = ranges[3];
  zmin = ranges[4];
  zmax = ranges[5];
}

//------------------------------------------------------------------------------
// Compute the bounds
double* vtkCubeAxesActor2D::GetRanges()
{
  double ranges[6];
  this->GetRanges(ranges);
  return this->Ranges;
}

//------------------------------------------------------------------------------
// Compute the bounds
void vtkCubeAxesActor2D::GetBounds(double bounds[6])
{
  const double* propBounds;
  int i;

  if (this->GetInput())
  {
    this->ConnectionHolder->GetInputAlgorithm()->Update();
    this->GetInput()->GetBounds(bounds);
    for (i = 0; i < 6; i++)
    {
      this->Bounds[i] = bounds[i];
    }
  }
  else if (this->ViewProp && ((propBounds = this->ViewProp->GetBounds()) && propBounds != nullptr))
  {
    for (i = 0; i < 6; i++)
    {
      bounds[i] = this->Bounds[i] = propBounds[i];
    }
  }
  else
  {
    for (i = 0; i < 6; i++)
    {
      bounds[i] = this->Bounds[i];
    }
  }
}

//------------------------------------------------------------------------------
// Compute the bounds
void vtkCubeAxesActor2D::GetBounds(
  double& xmin, double& xmax, double& ymin, double& ymax, double& zmin, double& zmax)
{
  double bounds[6];
  this->GetBounds(bounds);
  xmin = bounds[0];
  xmax = bounds[1];
  ymin = bounds[2];
  ymax = bounds[3];
  zmin = bounds[4];
  zmax = bounds[5];
}

//------------------------------------------------------------------------------
// Compute the bounds
double* vtkCubeAxesActor2D::GetBounds()
{
  this->GetBounds(this->Bounds);
  return this->Bounds;
}

//------------------------------------------------------------------------------
void vtkCubeAxesActor2D::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);

  if (this->GetInput())
  {
    os << indent << "Input: (" << (void*)this->GetInput() << ")\n";
  }
  else
  {
    os << indent << "Input: (none)\n";
  }

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

  os << indent << "Bounds: \n";
  os << indent << "  Xmin,Xmax: (" << this->Bounds[0] << ", " << this->Bounds[1] << ")\n";
  os << indent << "  Ymin,Ymax: (" << this->Bounds[2] << ", " << this->Bounds[3] << ")\n";
  os << indent << "  Zmin,Zmax: (" << this->Bounds[4] << ", " << this->Bounds[5] << ")\n";

  if (this->Camera)
  {
    os << indent << "Camera:\n";
    this->Camera->PrintSelf(os, indent.GetNextIndent());
  }
  else
  {
    os << indent << "Camera: (none)\n";
  }

  if (this->AxisTitleTextProperty)
  {
    os << indent << "Axis Title Text Property:\n";
    this->AxisTitleTextProperty->PrintSelf(os, indent.GetNextIndent());
  }
  else
  {
    os << indent << "Axis Title Text Property: (none)\n";
  }

  if (this->AxisLabelTextProperty)
  {
    os << indent << "Axis Label Text Property:\n";
    this->AxisLabelTextProperty->PrintSelf(os, indent.GetNextIndent());
  }
  else
  {
    os << indent << "Axis Label Text Property: (none)\n";
  }

  if (this->FlyMode == VTK_FLY_CLOSEST_TRIAD)
  {
    os << indent << "Fly Mode: CLOSEST_TRIAD\n";
  }
  else if (this->FlyMode == VTK_FLY_OUTER_EDGES)
  {
    os << indent << "Fly Mode: OUTER_EDGES\n";
  }
  else if (this->FlyMode == VTK_FLY_NONE)
  {
    os << indent << "Fly Mode: Disabled\n";
  }

  os << indent << "Scaling: " << (this->Scaling ? "On\n" : "Off\n");
  os << indent << "UseRanges: " << (this->UseRanges ? "On\n" : "Off\n");
  os << indent << "Ranges: \n";
  os << indent << "  Xmin,Xmax: (" << this->Ranges[0] << ", " << this->Ranges[1] << ")\n";
  os << indent << "  Ymin,Ymax: (" << this->Ranges[2] << ", " << this->Ranges[3] << ")\n";
  os << indent << "  Zmin,Zmax: (" << this->Ranges[4] << ", " << this->Ranges[5] << ")\n";

  os << indent << "Number Of Labels: " << this->NumberOfLabels << "\n";
  os << indent << "X Label: " << this->XLabel << "\n";
  os << indent << "Y Label: " << this->YLabel << "\n";
  os << indent << "Z Label: " << this->ZLabel << "\n";

  os << indent << "X Axis Visibility: " << (this->XAxisVisibility ? "On\n" : "Off\n");
  os << indent << "Y Axis Visibility: " << (this->YAxisVisibility ? "On\n" : "Off\n");
  os << indent << "Z Axis Visibility: " << (this->ZAxisVisibility ? "On\n" : "Off\n");

  os << indent << "Label Format: " << this->LabelFormat << "\n";
  os << indent << "Font Factor: " << this->FontFactor << "\n";
  os << indent << "Inertia: " << this->Inertia << "\n";
  os << indent << "Corner Offset: " << this->CornerOffset << "\n";
  os << indent << "UseRanges: " << (this->UseRanges ? "On" : "Off") << "\n";
  os << indent << "Ranges: " << this->Ranges[0] << ", " << this->Ranges[1] << ", "
     << this->Ranges[2] << ", " << this->Ranges[3] << ", " << this->Ranges[4] << ", "
     << this->Ranges[5] << "\n";
  os << indent << "Show Actual Bounds: " << (this->ShowActualBounds ? "On\n" : "Off\n");
  if (this->XOrigin != VTK_DOUBLE_MAX)
  {
    os << indent << "User specified X Origin: " << this->XOrigin << endl;
  }
  if (this->YOrigin != VTK_DOUBLE_MAX)
  {
    os << indent << "User specified Y Origin: " << this->YOrigin << endl;
  }
  if (this->ZOrigin != VTK_DOUBLE_MAX)
  {
    os << indent << "User specified Z Origin: " << this->ZOrigin << endl;
  }
}

//------------------------------------------------------------------------------
static int IsInBounds(double x[3], double bounds[6]);

// Clip the axes to fit into the viewport. Do this clipping each of the three
// axes to determine which part of the cube is in view. Returns 0 if
// nothing should be drawn.
#define VTK_DIVS 10
int vtkCubeAxesActor2D::ClipBounds(vtkViewport* viewport, double pts[8][3], double bounds[6])
{
  int i, j, k, numIters;
  double planes[24];
  double x[3];
  double val, maxVal = 0, anchor[3], scale;
  double delX, delY, delZ;
  double bounds2[6];
  double scale2, newScale, origin[3];
  double aspect[2];

  // Only do this mojo if scaling is required
  if (!this->Scaling)
  {
    return 1;
  }

  // Get the 6 planes defining the view frustrum
  viewport->GetAspect(aspect);
  this->Camera->GetFrustumPlanes((aspect[0] / aspect[1]), planes);

  // Hunt for the point in the bounds furthest inside the frustum
  // Iteratively loop over points in bounding box and evaluate the
  // maximum minimum distance. Find the point furthest inside of the
  // bounding box. Use this as an anchor point to scale to. Repeat
  // the process to hone in on the best point.
  delX = (bounds[1] - bounds[0]) / (VTK_DIVS - 1);
  delY = (bounds[3] - bounds[2]) / (VTK_DIVS - 1);
  delZ = (bounds[5] - bounds[4]) / (VTK_DIVS - 1);
  anchor[0] = (bounds[1] + bounds[0]) / 2.0;
  anchor[1] = (bounds[3] + bounds[2]) / 2.0;
  anchor[2] = (bounds[5] + bounds[4]) / 2.0;

  for (numIters = 0; numIters < 8; numIters++)
  {
    origin[0] = anchor[0] - delX * (VTK_DIVS - 1) / 2.0;
    origin[1] = anchor[1] - delY * (VTK_DIVS - 1) / 2.0;
    origin[2] = anchor[2] - delZ * (VTK_DIVS - 1) / 2.0;

    for (maxVal = 0.0, k = 0; k < VTK_DIVS; k++)
    {
      x[2] = origin[2] + k * delZ;
      for (j = 0; j < VTK_DIVS; j++)
      {
        x[1] = origin[1] + j * delY;
        for (i = 0; i < VTK_DIVS; i++)
        {
          x[0] = origin[0] + i * delX;
          if (IsInBounds(x, bounds))
          {
            val = this->EvaluatePoint(planes, x);
            if (val > maxVal)
            {
              anchor[0] = x[0];
              anchor[1] = x[1];
              anchor[2] = x[2];
              maxVal = val;
            }
          } // if in bounding box
        }   // i
      }     // j
    }       // k

    delX /= (VTK_DIVS - 1) * 1.414;
    delY /= (VTK_DIVS - 1) * 1.414;
    delZ /= (VTK_DIVS - 1) * 1.414;
  } // Iteratively find anchor point

  if (maxVal <= 0.0)
  {
    return 0; // couldn't find a point inside
  }

  // Now iteratively scale the bounding box until all points are inside
  // the frustrum. Use bisection method.
  scale = 1.0;
  scale2 = 0.00001;
  val = this->EvaluateBounds(planes, bounds);

  // Get other end point for bisection technique
  for (i = 0; i < 3; i++)
  {
    bounds2[2 * i] = (bounds[2 * i] - anchor[i]) * scale2 + anchor[i];
    bounds2[2 * i + 1] = (bounds[2 * i + 1] - anchor[i]) * scale2 + anchor[i];
  }
  val = this->EvaluateBounds(planes, bounds2);
  if (val <= 0.0)
  {
    return 0; // not worth drawing - too small
  }

  for (numIters = 0; numIters < 10; numIters++)
  {
    newScale = (scale + scale2) / 2.0;
    for (i = 0; i < 3; i++)
    {
      bounds2[2 * i] = (bounds[2 * i] - anchor[i]) * newScale + anchor[i];
      bounds2[2 * i + 1] = (bounds[2 * i + 1] - anchor[i]) * newScale + anchor[i];
    }
    val = this->EvaluateBounds(planes, bounds2);

    if (val > 0.0)
    {
      scale2 = newScale;
    }
    else
    {
      scale = newScale;
    }
  } // for converged

  for (i = 0; i < 6; i++) // copy the result
  {
    bounds[i] = bounds2[i];
  }

  this->TransformBounds(viewport, bounds, pts);

  return 1;
}
#undef VTK_DIVS

//------------------------------------------------------------------------------
void vtkCubeAxesActor2D::TransformBounds(vtkViewport* viewport, double bounds[6], double pts[8][3])
{
  int i, j, k, idx;
  double x[3];

  // loop over verts of bounding box
  for (k = 0; k < 2; k++)
  {
    x[2] = bounds[4 + k];
    for (j = 0; j < 2; j++)
    {
      x[1] = bounds[2 + j];
      for (i = 0; i < 2; i++)
      {
        idx = i + 2 * j + 4 * k;
        x[0] = bounds[i];
        viewport->SetWorldPoint(x[0], x[1], x[2], 1.0);
        viewport->WorldToDisplay();
        viewport->GetDisplayPoint(pts[idx]);
      }
    }
  }
}

//------------------------------------------------------------------------------
// Return smallest value of point evaluated against frustum planes. Also
// sets the closest point coordinates in xyz.
double vtkCubeAxesActor2D::EvaluatePoint(double planes[24], double x[3])
{
  int kk;
  double* plane;
  double val, minPlanesValue;

  for (minPlanesValue = VTK_DOUBLE_MAX, kk = 0; kk < 6; kk++)
  {
    plane = planes + kk * 4;
    val = plane[0] * x[0] + plane[1] * x[1] + plane[2] * x[2] + plane[3];

    if (val < minPlanesValue)
    {
      minPlanesValue = val;
    }
  } // for all planes

  return minPlanesValue;
}

//------------------------------------------------------------------------------
// Return the smallest point of the bounding box evaluated against the
// frustum planes.
double vtkCubeAxesActor2D::EvaluateBounds(double planes[24], double bounds[6])
{
  double val, minVal, x[3];
  int i, j, k;

  for (minVal = VTK_DOUBLE_MAX, k = 0; k < 2; k++)
  {
    x[2] = bounds[4 + k];
    for (j = 0; j < 2; j++)
    {
      x[1] = bounds[2 + j];
      for (i = 0; i < 2; i++)
      {
        x[0] = bounds[i];
        val = this->EvaluatePoint(planes, x);
        if (val < minVal)
        {
          minVal = val;
        }
      }
    }
  } // loop over verts of bounding box

  return minVal;
}

//------------------------------------------------------------------------------
static int IsInBounds(double x[3], double bounds[6])
{
  if (x[0] < bounds[0] || x[0] > bounds[1] || x[1] < bounds[2] || x[1] > bounds[3] ||
    x[2] < bounds[4] || x[2] > bounds[5])
  {
    return 0;
  }
  else
  {
    return 1;
  }
}
