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

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

#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkTransform.h"

vtkStandardNewMacro(vtkPlaneSource);

// Construct plane perpendicular to z-axis, resolution 1x1, width and height
// 1.0, and centered at the origin.
vtkPlaneSource::vtkPlaneSource()
{
  this->XResolution = 1;
  this->YResolution = 1;

  this->Origin[0] = this->Origin[1] = -0.5;
  this->Origin[2] = 0.0;

  this->Point1[0] = 0.5;
  this->Point1[1] = -0.5;
  this->Point1[2] = 0.0;

  this->Point2[0] = -0.5;
  this->Point2[1] = 0.5;
  this->Point2[2] = 0.0;

  this->Normal[2] = 1.0;
  this->Normal[0] = this->Normal[1] = 0.0;

  this->Center[0] = this->Center[1] = this->Center[2] = 0.0;

  this->OutputPointsPrecision = SINGLE_PRECISION;

  this->SetNumberOfInputPorts(0);
}

// Set the number of x-y subdivisions in the plane.
void vtkPlaneSource::SetResolution(const int xR, const int yR)
{
  if (xR != this->XResolution || yR != this->YResolution)
  {
    this->XResolution = xR;
    this->YResolution = yR;

    this->XResolution = (this->XResolution > 0 ? this->XResolution : 1);
    this->YResolution = (this->YResolution > 0 ? this->YResolution : 1);

    this->Modified();
  }
}

int vtkPlaneSource::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
  // get the info object
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // get the output
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  double x[3], tc[2], v1[3], v2[3];
  vtkIdType pts[4];
  int i, j, ii;
  int numPts;
  int numPolys;
  vtkPoints* newPoints;
  vtkFloatArray* newNormals;
  vtkFloatArray* newTCoords;
  vtkCellArray* newPolys;

  // Check input
  for (i = 0; i < 3; i++)
  {
    v1[i] = this->Point1[i] - this->Origin[i];
    v2[i] = this->Point2[i] - this->Origin[i];
  }

  if (!this->UpdatePlane(v1, v2))
  {
    vtkErrorMacro(<< "Bad plane coordinate system");
    return 0;
  }

  // Set things up; allocate memory
  //
  numPts = (this->XResolution + 1) * (this->YResolution + 1);
  numPolys = this->XResolution * this->YResolution;

  newPoints = vtkPoints::New();

  // Set the desired precision for the points in the output.
  if (this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
  {
    newPoints->SetDataType(VTK_DOUBLE);
  }
  else
  {
    newPoints->SetDataType(VTK_FLOAT);
  }

  newPoints->Allocate(numPts);
  newNormals = vtkFloatArray::New();
  newNormals->SetNumberOfComponents(3);
  newNormals->Allocate(3 * numPts);
  newTCoords = vtkFloatArray::New();
  newTCoords->SetNumberOfComponents(2);
  newTCoords->Allocate(2 * numPts);

  newPolys = vtkCellArray::New();
  newPolys->AllocateEstimate(numPolys, 4);

  // Generate points and point data
  //
  for (numPts = 0, i = 0; i < (this->YResolution + 1); i++)
  {
    tc[1] = static_cast<double>(i) / this->YResolution;
    for (j = 0; j < (this->XResolution + 1); j++)
    {
      tc[0] = static_cast<double>(j) / this->XResolution;

      for (ii = 0; ii < 3; ii++)
      {
        x[ii] = this->Origin[ii] + tc[0] * v1[ii] + tc[1] * v2[ii];
      }

      newPoints->InsertPoint(numPts, x);
      newTCoords->InsertTuple(numPts, tc);
      newNormals->InsertTuple(numPts++, this->Normal);
    }
  }

  // Generate polygon connectivity
  //
  for (i = 0; i < this->YResolution; i++)
  {
    for (j = 0; j < this->XResolution; j++)
    {
      pts[0] = j + i * (this->XResolution + 1);
      pts[1] = pts[0] + 1;
      pts[2] = pts[0] + this->XResolution + 2;
      pts[3] = pts[0] + this->XResolution + 1;
      newPolys->InsertNextCell(4, pts);
    }
  }

  // Update ourselves and release memory
  //
  output->SetPoints(newPoints);
  newPoints->Delete();

  newNormals->SetName("Normals");
  output->GetPointData()->SetNormals(newNormals);
  newNormals->Delete();

  newTCoords->SetName("TextureCoordinates");
  output->GetPointData()->SetTCoords(newTCoords);
  newTCoords->Delete();

  output->SetPolys(newPolys);
  newPolys->Delete();

  return 1;
}

// Set the normal to the plane. Will modify the Origin, Point1, and Point2
// instance variables as necessary (i.e., rotate the plane around its center).
void vtkPlaneSource::SetNormal(double N[3])
{
  double n[3], rotVector[3], theta;

  // make sure input is decent
  n[0] = N[0];
  n[1] = N[1];
  n[2] = N[2];
  if (vtkMath::Normalize(n) == 0.0)
  {
    vtkErrorMacro(<< "Specified zero normal");
    return;
  }

  // Compute rotation vector using a transformation matrix.
  // Note that if normals are parallel then the rotation is either
  // 0 or 180 degrees.
  double dp = vtkMath::Dot(this->Normal, n);
  if (dp >= 1.0)
  {
    return; // zero rotation
  }
  else if (dp <= -1.0)
  {
    theta = 180.0;
    rotVector[0] = this->Point1[0] - this->Origin[0];
    rotVector[1] = this->Point1[1] - this->Origin[1];
    rotVector[2] = this->Point1[2] - this->Origin[2];
  }
  else
  {
    vtkMath::Cross(this->Normal, n, rotVector);
    theta = vtkMath::DegreesFromRadians(acos(dp));
  }

  // create rotation matrix
  vtkTransform* transform = vtkTransform::New();
  transform->PostMultiply();

  transform->Translate(-this->Center[0], -this->Center[1], -this->Center[2]);
  transform->RotateWXYZ(theta, rotVector[0], rotVector[1], rotVector[2]);
  transform->Translate(this->Center[0], this->Center[1], this->Center[2]);

  // transform the three defining points
  transform->TransformPoint(this->Origin, this->Origin);
  transform->TransformPoint(this->Point1, this->Point1);
  transform->TransformPoint(this->Point2, this->Point2);

  this->Normal[0] = n[0];
  this->Normal[1] = n[1];
  this->Normal[2] = n[2];

  this->Modified();
  transform->Delete();
}

// Set the normal to the plane. Will modify the Origin, Point1, and Point2
// instance variables as necessary (i.e., rotate the plane around its center).
void vtkPlaneSource::SetNormal(double nx, double ny, double nz)
{
  double n[3];

  n[0] = nx;
  n[1] = ny;
  n[2] = nz;
  this->SetNormal(n);
}

// Set the center of the plane. Will modify the Origin, Point1, and Point2
// instance variables as necessary (i.e., translate the plane).
void vtkPlaneSource::SetCenter(double center[3])
{
  if (this->Center[0] == center[0] && this->Center[1] == center[1] && this->Center[2] == center[2])
  {
    return; // no change
  }
  else
  {
    int i;
    double v1[3], v2[3];

    for (i = 0; i < 3; i++)
    {
      v1[i] = this->Point1[i] - this->Origin[i];
      v2[i] = this->Point2[i] - this->Origin[i];
    }

    for (i = 0; i < 3; i++)
    {
      this->Center[i] = center[i];
      this->Origin[i] = this->Center[i] - 0.5 * (v1[i] + v2[i]);
      this->Point1[i] = this->Origin[i] + v1[i];
      this->Point2[i] = this->Origin[i] + v2[i];
    }
    this->Modified();
  }
}

// Set the center of the plane. Will modify the Origin, Point1, and Point2
// instance variables as necessary (i.e., translate the plane).
void vtkPlaneSource::SetCenter(double x, double y, double z)
{
  double center[3];

  center[0] = x;
  center[1] = y;
  center[2] = z;
  this->SetCenter(center);
}

// modifies the normal and origin
void vtkPlaneSource::SetPoint1(double pnt[3])
{
  if (this->Point1[0] == pnt[0] && this->Point1[1] == pnt[1] && this->Point1[2] == pnt[2])
  {
    return; // no change
  }
  else
  {
    int i;
    double v1[3], v2[3];

    for (i = 0; i < 3; i++)
    {
      this->Point1[i] = pnt[i];
      v1[i] = this->Point1[i] - this->Origin[i];
      v2[i] = this->Point2[i] - this->Origin[i];
    }

    // set plane normal
    this->UpdatePlane(v1, v2);
    this->Modified();
  }
}

// modifies the normal and origin
void vtkPlaneSource::SetPoint2(double pnt[3])
{
  if (this->Point2[0] == pnt[0] && this->Point2[1] == pnt[1] && this->Point2[2] == pnt[2])
  {
    return; // no change
  }
  else
  {
    int i;
    double v1[3], v2[3];

    for (i = 0; i < 3; i++)
    {
      this->Point2[i] = pnt[i];
      v1[i] = this->Point1[i] - this->Origin[i];
      v2[i] = this->Point2[i] - this->Origin[i];
    }
    // set plane normal
    this->UpdatePlane(v1, v2);
    this->Modified();
  }
}

void vtkPlaneSource::SetPoint1(double x, double y, double z)
{
  double pnt[3];

  pnt[0] = x;
  pnt[1] = y;
  pnt[2] = z;
  this->SetPoint1(pnt);
}
void vtkPlaneSource::SetPoint2(double x, double y, double z)
{
  double pnt[3];

  pnt[0] = x;
  pnt[1] = y;
  pnt[2] = z;
  this->SetPoint2(pnt);
}

// Translate the plane in the direction of the normal by the distance specified.
// Negative values move the plane in the opposite direction.
void vtkPlaneSource::Push(double distance)
{
  int i;

  if (distance == 0.0)
  {
    return;
  }
  for (i = 0; i < 3; i++)
  {
    this->Origin[i] += distance * this->Normal[i];
    this->Point1[i] += distance * this->Normal[i];
    this->Point2[i] += distance * this->Normal[i];
  }
  // set the new center
  for (i = 0; i < 3; i++)
  {
    this->Center[i] = 0.5 * (this->Point1[i] + this->Point2[i]);
  }

  this->Modified();
}

// Protected method updates normals and plane center from two axes.
int vtkPlaneSource::UpdatePlane(double v1[3], double v2[3])
{
  // set plane center
  for (int i = 0; i < 3; i++)
  {
    this->Center[i] = this->Origin[i] + 0.5 * (v1[i] + v2[i]);
  }

  // set plane normal
  vtkMath::Cross(v1, v2, this->Normal);
  if (vtkMath::Normalize(this->Normal) == 0.0)
  {
    return 0;
  }
  else
  {
    return 1;
  }
}

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

  os << indent << "X Resolution: " << this->XResolution << "\n";
  os << indent << "Y Resolution: " << this->YResolution << "\n";

  os << indent << "Origin: (" << this->Origin[0] << ", " << this->Origin[1] << ", "
     << this->Origin[2] << ")\n";

  os << indent << "Point 1: (" << this->Point1[0] << ", " << this->Point1[1] << ", "
     << this->Point1[2] << ")\n";

  os << indent << "Point 2: (" << this->Point2[0] << ", " << this->Point2[1] << ", "
     << this->Point2[2] << ")\n";

  os << indent << "Normal: (" << this->Normal[0] << ", " << this->Normal[1] << ", "
     << this->Normal[2] << ")\n";

  os << indent << "Center: (" << this->Center[0] << ", " << this->Center[1] << ", "
     << this->Center[2] << ")\n";

  os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
