vtkOFFReader.cxx

/*=========================================================================
  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkOFFReader.cxx,v $
  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 "vtkOFFReader.h"

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

#include <sstream>
#include <fstream>

vtkStandardNewMacro(vtkOFFReader);

// Description:
// Instantiate object with NULL filename.
vtkOFFReader::vtkOFFReader()
{
    this->FileName = NULL;

    this->SetNumberOfInputPorts(0);
}

vtkOFFReader::~vtkOFFReader()
{
    if (this->FileName)
    {
        delete[] this->FileName;
        this->FileName = NULL;
    }
}

/*--------------------------------------------------------
This is only partial support for the OFF format, which is
quite complicated. To find a full specification,
search the net for "OFF format", eg.:
http://people.sc.fsu.edu/~burkardt/data/off/off.html
We support only vertices and faces composed of 3 vertices.
---------------------------------------------------------*/

// a replacement for isspace()
int is_whitespace(char c)
{
    if (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\v' || c == '\f')
        return 1;
    else
        return 0;
}

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

    // get the ouptut