vtkCubeSource.cxx

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

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

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

#include <cmath>

vtkStandardNewMacro(vtkCubeSource);

vtkCubeSource::vtkCubeSource(double xL, double yL, double zL)
{
  this->XLength = fabs(xL);
  this->YLength = fabs(yL);
  this->ZLength = fabs(zL);

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

  this->OutputPointsPrecision = SINGLE_PRECISION;

  this->SetNumberOfInputPorts(0);
}

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

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

  double x[3], n[3], tc[3];
  int numPolys=6, numPts=24;
  int i, j, k;
  vtkIdType pts[4];
  vtkPoints *newPoints;
  vtkFloatArray *newNormals;
  vtkFloatArray *newTCoords; // CCS 7/27/98 Added for Texture Mapping
  vtkCellArray *newPolys;

//
// Set things up; allocate memory
//
  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(numPts);
  newNormals->SetName("Normals");
  newTCoords = vtkFloatArray::New();
  newTCoords->SetNumberOfComponents(2);
  newTCoords->Allocate(numPts);
  newTCoords->SetName("TCoords");

  newPolys = vtkCellArray::New();
  newPolys->Allocate(newPolys->EstimateSize(numPolys,4));
//
// Generate points and normals
//

  for (x[0]=this->Center[0]-this->XLength/2.0, n[0]=(-1.0), n[1]=n[2]=0.0, i=0;
  i<2; i++, x[0]+=this->XLength, n[0]+=2.0)
  {
    for (x[1]=this->Center[1]-this->YLength/2.0, j=0; j<2;
    j++, x[1]+=this->YLength)
    {
      tc[1] =  x[1] + 0.5;
      for (x[2]=this->Center[2]-this->ZLength/2.0, k=0; k<2;
      k++, x[2]+=this->ZLength)
      {
        tc[0] = (x[2] + 0.5) * ( 1 - 2*i );
        newPoints->InsertNextPoint(x);
        newTCoords->InsertNextTuple(tc);
        newNormals->InsertNextTuple(n);
      }
    }
  }
  pts[0] = 0; pts[1] = 1; pts[2] = 3; pts[3] = 2;
  newPolys->InsertNextCell(4,pts);
  pts[0] = 4; pts[1] = 6; pts[2] = 7; pts[3] = 5;
  newPolys->InsertNextCell(4,pts);

  for (x[1]=this->Center[1]-this->YLength/2.0, n[1]=(-1.0), n[0]=n[2]=0.0, i=0;
  i<2; i++, x[1]+=this->YLength, n[1]+=2.0)
  {
    for (x[0]=this->Center[0]-this->XLength/2.0, j=0; j<2;
    j++, x[0]+=this->XLength)
    {
      tc[0] = ( x[0] + 0.5 ) * ( 2*i - 1 );
      for (x[2]=this->Center[2]-this->ZLength/2.0, k=0; k<2;
      k++, x[2]+=this->ZLength)
      {
        tc[1] = ( x[2] + 0.5 ) * -1;
        newPoints->InsertNextPoint(x);
        newTCoords->InsertNextTuple(tc);
        newNormals->InsertNextTuple(n);
      }
    }
  }
  pts[0] = 8; pts[1] = 10; pts[2] = 11; pts[3] = 9;
  newPolys->InsertNextCell(4,pts);
  pts[0] = 12; pts[1] = 13; pts[2] = 15; pts[3] = 14;
  newPolys->InsertNextCell(4,pts);

  for (x[2]=this->Center[2]-this->ZLength/2.0, n[2]=(-1.0), n[0]=n[1]=0.0, i=0;
  i<2; i++, x[2]+=this->ZLength, n[2]+=2.0)
  {
    for (x[1]=this->Center[1]-this->YLength/2.0, j=0; j<2;
    j++, x[1]+=this->YLength)
    {
      tc[1] = x[1] + 0.5;
      for (x[0]=this->Center[0]-this->XLength/2.0, k=0; k<2;
      k++, x[0]+=this->XLength)
      {
        tc[0] = ( x[0] + 0.5 ) * ( 2*i - 1 );
        newPoints->InsertNextPoint(x);
        newTCoords->InsertNextTuple(tc);
        newNormals->InsertNextTuple(n);
      }
    }
  }
  pts[0] = 16; pts[1] = 18; pts[2] = 19; pts[3] = 17;
  newPolys->InsertNextCell(4,pts);
  pts[0] = 20; pts[1] = 21; pts[2] = 23; pts[3] = 22;
  newPolys->InsertNextCell(4,pts);
//
// Update ourselves and release memory
//
  output->SetPoints(newPoints);
  newPoints->Delete();

  output->GetPointData()->SetNormals(newNormals);
  newNormals->Delete();

  output->GetPointData()->SetTCoords(newTCoords);
  newTCoords->Delete();

  newPolys->Squeeze(); // since we've estimated size; reclaim some space
  output->SetPolys(newPolys);
  newPolys->Delete();

  return 1;
}

// Convenience method allows creation of cube by specifying bounding box.
void vtkCubeSource::SetBounds(double xMin, double xMax,
                              double yMin, double yMax,
                              double zMin, double zMax)
{
  double bounds[6];
  bounds[0] = xMin;
  bounds[1] = xMax;
  bounds[2] = yMin;
  bounds[3] = yMax;
  bounds[4] = zMin;
  bounds[5] = zMax;
  this->SetBounds (bounds);
}

void vtkCubeSource::SetBounds(const double bounds[6])
{
  this->SetXLength(bounds[1]-bounds[0]);
  this->SetYLength(bounds[3]-bounds[2]);
  this->SetZLength(bounds[5]-bounds[4]);

  this->SetCenter((bounds[1]+bounds[0])/2.0, (bounds[3]+bounds[2])/2.0,
                  (bounds[5]+bounds[4])/2.0);
}

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

  os << indent << "X Length: " << this->XLength << "\n";
  os << indent << "Y Length: " << this->YLength << "\n";
  os << indent << "Z Length: " << this->ZLength << "\n";
  os << indent << "Center: (" << this->Center[0] << ", "
               << this->Center[1] << ", " << this->Center[2] << ")\n";
  os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}