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

  Program:   Visualization Toolkit
  Module:    vtkGeometryFilter.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkGeometryFilter - extract geometry from data (or convert data to polygonal type)
// .SECTION Description
// vtkGeometryFilter is a general-purpose filter to extract geometry (and 
// associated data) from any type of dataset. Geometry is obtained as 
// follows: all 0D, 1D, and 2D cells are extracted. All 2D faces that are 
// used by only one 3D cell (i.e., boundary faces) are extracted. It also is 
// possible to specify conditions on point ids, cell ids, and on 
// bounding box (referred to as "Extent") to control the extraction process.
//
// This filter also may be used to convert any type of data to polygonal
// type. The conversion process may be less than satisfactory for some 3D
// datasets. For example, this filter will extract the outer surface of a 
// volume or structured grid dataset. (For structured data you may want to
// use vtkStructuredPointsGeometryFilter, vtkStructuredGridGeometryFilter,
// vtkUnstructuredGridGeometryFilter, vtkRectilinearGridGeometryFilter, or 
// vtkExtractVOI.)

// .SECTION Caveats
// When vtkGeometryFilter extracts cells (or boundaries of cells) it
// will (by default) merge duplicate vertices. This may cause problems
// in some cases. For example, if you've run vtkPolyDataNormals to
// generate normals, which may split meshes and create duplicate
// vertices, vtkGeometryFilter will merge these points back
// together. Turn merging off to prevent this from occurring.

// .SECTION See Also
// vtkStructuredPointsGeometryFilter vtkStructuredGridGeometryFilter
// vtkExtractGeometry vtkExtractVOI

#ifndef __vtkGeometryFilter_h
#define __vtkGeometryFilter_h

#include "vtkDataSetToPolyDataFilter.h"

class VTK_GRAPHICS_EXPORT vtkGeometryFilter : public vtkDataSetToPolyDataFilter
{
public:
  static vtkGeometryFilter *New();
  vtkTypeMacro(vtkGeometryFilter,vtkDataSetToPolyDataFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Turn on/off selection of geometry by point id.
  vtkSetMacro(PointClipping,int);
  vtkGetMacro(PointClipping,int);
  vtkBooleanMacro(PointClipping,int);

  // Description:
  // Turn on/off selection of geometry by cell id.
  vtkSetMacro(CellClipping,int);
  vtkGetMacro(CellClipping,int);
  vtkBooleanMacro(CellClipping,int);

  // Description:
  // Turn on/off selection of geometry via bounding box.
  vtkSetMacro(ExtentClipping,int);
  vtkGetMacro(ExtentClipping,int);
  vtkBooleanMacro(ExtentClipping,int);

  // Description:
  // Specify the minimum point id for point id selection.
  vtkSetClampMacro(PointMinimum,vtkIdType,0,VTK_LARGE_ID);
  vtkGetMacro(PointMinimum,vtkIdType);

  // Description:
  // Specify the maximum point id for point id selection.
  vtkSetClampMacro(PointMaximum,vtkIdType,0,VTK_LARGE_ID);
  vtkGetMacro(PointMaximum,vtkIdType);

  // Description:
  // Specify the minimum cell id for point id selection.
  vtkSetClampMacro(CellMinimum,vtkIdType,0,VTK_LARGE_ID);
  vtkGetMacro(CellMinimum,vtkIdType);

  // Description:
  // Specify the maximum cell id for point id selection.
  vtkSetClampMacro(CellMaximum,vtkIdType,0,VTK_LARGE_ID);
  vtkGetMacro(CellMaximum,vtkIdType);

  // Description:
  // Specify a (xmin,xmax, ymin,ymax, zmin,zmax) bounding box to clip data.
  void SetExtent(float xMin, float xMax, float yMin, float yMax, 
                 float zMin, float zMax);

  // Description:
  // Set / get a (xmin,xmax, ymin,ymax, zmin,zmax) bounding box to clip data.
  void SetExtent(float extent[6]);
  float *GetExtent() { return this->Extent;};

  // Description:
  // Turn on/off merging of coincident points. Note that is merging is
  // on, points with different point attributes (e.g., normals) are merged,
  // which may cause rendering artifacts.
  vtkSetMacro(Merging,int);
  vtkGetMacro(Merging,int);
  vtkBooleanMacro(Merging,int);

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

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

  // Description:
  // Return the MTime also considering the locator.
  unsigned long GetMTime();

protected:
  vtkGeometryFilter();
  ~vtkGeometryFilter();

  void Execute();
  void PolyDataExecute(); //special cases for performance
  void UnstructuredGridExecute();
  void StructuredGridExecute();
  void ComputeInputUpdateExtents(vtkDataObject *output);
  void ExecuteInformation();

  vtkIdType PointMaximum;
  vtkIdType PointMinimum;
  vtkIdType CellMinimum;
  vtkIdType CellMaximum;
  float Extent[6];
  int PointClipping;
  int CellClipping;
  int ExtentClipping;

  int Merging;
  vtkPointLocator *Locator;
private:
  vtkGeometryFilter(const vtkGeometryFilter&);  // Not implemented.
  void operator=(const vtkGeometryFilter&);  // Not implemented.
};

#endif


