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

  Program:   Visualization Toolkit
  Module:    vtkEllipsoidTensorProbeRepresentation.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 "vtkEllipsoidTensorProbeRepresentation.h"
#include "vtkPolyDataMapper.h"
#include "vtkPolyData.h"
#include "vtkPoints.h"
#include "vtkPointData.h"
#include "vtkDoubleArray.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkObjectFactory.h"
#include "vtkPolyDataNormals.h"
#include "vtkRenderWindow.h"
#include "vtkTensorGlyph.h"
#include "vtkCommand.h"
#include "vtkCellArray.h"
#include "vtkMath.h"
#include "vtkSphereSource.h"
#include "vtkCellPicker.h"
#include "vtkAssemblyPath.h"

vtkStandardNewMacro(vtkEllipsoidTensorProbeRepresentation);

//----------------------------------------------------------------------
vtkEllipsoidTensorProbeRepresentation
::vtkEllipsoidTensorProbeRepresentation()
{
  vtkSphereSource *sphere = vtkSphereSource::New();
  sphere->SetThetaResolution( 24 );
  sphere->SetPhiResolution( 24 );

  vtkPoints * points = vtkPoints::New();
  points->SetDataTypeToDouble();
  points->SetNumberOfPoints(1);
  points->SetPoint( 0, 0.0, 0.0, 0.0 );

  this->TensorSource = vtkPolyData::New();
  this->TensorSource->SetPoints(points);
  vtkDoubleArray * tensor = vtkDoubleArray::New();
  tensor->SetNumberOfComponents(9);
  tensor->Allocate(9);
  double t[9];
  t[0] = .01; // Component(0,0)
  t[4] = .01; // Component(1,1);
  t[8] = .01; // Component(2,2);
  t[3] = 0.0; // Component(0,1);
  t[6] = 0.0; // Component(0,2);
  t[1] = 0.0; // Component(1,0);
  t[7] = 0.0; // Component(1,2);
  t[2] = 0.0; // Component(2,0);
  t[5] = 0.0; // Component(2,1);
  tensor->InsertNextTuple(t);
  this->TensorSource->GetPointData()->SetTensors(tensor);
  tensor->Delete();
  points->Delete();

  this->TensorGlypher = vtkTensorGlyph::New();
  this->TensorGlypher->SetInput(this->TensorSource);
  this->TensorGlypher->SetSource(sphere->GetOutput());
  this->TensorGlypher->SetScaleFactor(10);
  this->TensorGlypher->ClampScalingOn();
  sphere->Delete();

  this->PolyDataNormals = vtkPolyDataNormals::New();
  this->PolyDataNormals->AutoOrientNormalsOn();
  this->PolyDataNormals->SetInput(this->TensorGlypher->GetOutput());

  this->EllipsoidMapper = vtkPolyDataMapper::New();
  this->EllipsoidMapper->SetInput(this->PolyDataNormals->GetOutput());
  this->EllipsoidActor = vtkActor::New();
  this->EllipsoidActor->SetMapper(this->EllipsoidMapper);

  this->CellPicker = vtkCellPicker::New();
  this->CellPicker->PickFromListOn();
  this->CellPicker->AddPickList(this->EllipsoidActor);
  this->CellPicker->SetTolerance(0.01); //need some fluff
}

//----------------------------------------------------------------------
vtkEllipsoidTensorProbeRepresentation
::~vtkEllipsoidTensorProbeRepresentation()
{
  this->TensorSource->Delete();
  this->EllipsoidMapper->Delete();
  this->EllipsoidActor->Delete();
  this->TensorGlypher->Delete();
  this->CellPicker->Delete();
  this->PolyDataNormals->Delete();
}

//----------------------------------------------------------------------
void vtkEllipsoidTensorProbeRepresentation
::EvaluateTensor( double t[9] )
{
  double p1[3], p2[3];
  this->Trajectory->GetPoints()->GetPoint( this->ProbeCellId, p1 );
  this->Trajectory->GetPoints()->GetPoint( this->ProbeCellId+1, p2 );
  double d = vtkMath::Distance2BetweenPoints(p1, p2);
  double r = 1.0, t1[9], t2[9];
  if (d > 1e-12)
    {
    r = sqrt(vtkMath::Distance2BetweenPoints( this->ProbePosition, p2 ) / d);
    }

  if (vtkDataArray *tensors = this->Trajectory->GetPointData()->GetTensors())
    {
    tensors->GetTuple( this->ProbeCellId, t1 );
    tensors->GetTuple( this->ProbeCellId+1, t2 );
    }


  // NN interpolation ?
  // if ( r < 0.5 )
  //  {
  //  for (int i =0; i < 9; i++)
  //    {
  //    t[i] = t2[i];
  //    }
  //  }
  //else
  //  {
  //  for (int i =0; i < 9; i++)
  //    {
  //    t[i] = t1[i];
  //    }
  //  }

  // Linear interp
  for (int i =0; i < 9; i++)
    {
    t[i] = r * t1[i] + (1-r)*t2[i];
    }
}

//----------------------------------------------------------------------
int vtkEllipsoidTensorProbeRepresentation
::RenderOpaqueGeometry(vtkViewport *viewport)
{
  int count = this->Superclass::RenderOpaqueGeometry(viewport);
  count += this->EllipsoidActor->RenderOpaqueGeometry(viewport);
  return count;
}

//----------------------------------------------------------------------
int vtkEllipsoidTensorProbeRepresentation::SelectProbe( int pos[2] )
{
  this->VisibilityOn(); //actor must be on to be picked
  this->CellPicker->Pick(pos[0],pos[1],0.0,this->Renderer);
  return this->CellPicker->GetPath() ? 1 : 0;
}

//----------------------------------------------------------------------
void vtkEllipsoidTensorProbeRepresentation::BuildRepresentation()
{
  this->Superclass::BuildRepresentation();

  vtkPoints * pts = this->TensorSource->GetPoints();
  pts->SetPoint( 0, this->ProbePosition );

  double t[9];
  this->EvaluateTensor( t );
  this->TensorSource->GetPointData()->GetTensors()->SetTuple( 0, t );
  this->TensorSource->Modified();
}

//----------------------------------------------------------------------
void vtkEllipsoidTensorProbeRepresentation::GetActors(vtkPropCollection *pc)
{
  this->EllipsoidActor->GetActors(pc);
}

//----------------------------------------------------------------------
void vtkEllipsoidTensorProbeRepresentation::ReleaseGraphicsResources(vtkWindow *win)
{
  this->EllipsoidActor->ReleaseGraphicsResources(win);
}

//----------------------------------------------------------------------
void vtkEllipsoidTensorProbeRepresentation
::PrintSelf(ostream& os, vtkIndent indent)
{
  //Superclass typedef defined in vtkTypeMacro() found in vtkSetGet.h
  this->Superclass::PrintSelf(os,indent);

  os << indent << "EllipsoidActor: " << this->EllipsoidActor << endl;
  os << indent << "EllipsoidMapper: " << this->EllipsoidMapper << endl;
  os << indent << "TensorSource: " << this->TensorSource << endl;
  os << indent << "TensorGlypher: " << this->TensorGlypher << endl;
  os << indent << "CellPicker: " << this->CellPicker << endl;
  os << indent << "PolyDataNormals: " << this->PolyDataNormals << endl;
}

