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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkSTLReader.h,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.

=========================================================================*/
// .NAME vtkSTLReader - read ASCII or binary stereo lithography files
// .SECTION Description
// vtkSTLReader is a source object that reads ASCII or binary stereo 
// lithography files (.stl files). The FileName must be specified to
// vtkSTLReader. The object automatically detects whether the file is
// ASCII or binary.
//
// .stl files are quite inefficient since they duplicate vertex 
// definitions. By setting the Merging boolean you can control whether the 
// point data is merged after reading. Merging is performed by default, 
// however, merging requires a large amount of temporary storage since a 
// 3D hash table must be constructed.

// .SECTION Caveats
// Binary files written on one system may not be readable on other systems.
// vtkSTLWriter uses VAX or PC byte ordering and swaps bytes on other systems.

#ifndef __vtkSTLReader_h
#define __vtkSTLReader_h

#include "vtkPolyDataAlgorithm.h"

class vtkCellArray;
class vtkFloatArray;
class vtkIncrementalPointLocator;
class vtkPoints;

class VTK_IO_EXPORT vtkSTLReader : public vtkPolyDataAlgorithm 
{
public:
  vtkTypeRevisionMacro(vtkSTLReader,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Construct object with merging set to true.
  static vtkSTLReader *New();

  // Description:
  // Overload standard modified time function. If locator is modified,
  // then this object is modified as well.
  unsigned long GetMTime();

  // Description:
  // Specify file name of stereo lithography file.
  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);
      
  // Description:
  // Turn on/off merging of points/triangles.
  vtkSetMacro(Merging,int);
  vtkGetMacro(Merging,int);
  vtkBooleanMacro(Merging,int);

  // Description:
  // Turn on/off tagging of solids with scalars.
  vtkSetMacro(ScalarTags,int);
  vtkGetMacro(ScalarTags,int);
  vtkBooleanMacro(ScalarTags,int);

  // Description:
  // Specify a spatial locator for merging points. By
  // default an instance of vtkMergePoints is used.
  void SetLocator(vtkIncrementalPointLocator *locator);
  vtkGetObjectMacro(Locator,vtkIncrementalPointLocator);

  // Description:
  // Create default locator. Used to create one when none is specified.
  void CreateDefaultLocator();
      
protected:
  vtkSTLReader();
  ~vtkSTLReader();

  char *FileName;
  int Merging;
  int ScalarTags;
  vtkIncrementalPointLocator *Locator;

  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
  int ReadBinarySTL(FILE *fp, vtkPoints*, vtkCellArray*);
  int ReadASCIISTL(FILE *fp, vtkPoints*, vtkCellArray*, 
                   vtkFloatArray* scalars=0);
  int GetSTLFileType(const char *filename);
private:
  vtkSTLReader(const vtkSTLReader&);  // Not implemented.
  void operator=(const vtkSTLReader&);  // Not implemented.
};

#endif
