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

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


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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=========================================================================*/
// .NAME vtkTriangleStrip - a cell that represents a triangle strip
// .SECTION Description
// vtkTriangleStrip is a concrete implementation of vtkCell to represent a 2D 
// triangle strip. A triangle strip is a compact representation of triangles
// connected edge to edge in strip fashion. The connectivity of a triangle 
// strip is three points defining an initial triangle, then for each 
// additional triangle, a single point that, combined with the previous two
// points, defines the next triangle.

#ifndef __vtkTriangleStrip_h
#define __vtkTriangleStrip_h

#include "vtkCell.h"
#include "vtkLine.h"
#include "vtkTriangle.h"

class VTK_EXPORT vtkTriangleStrip : public vtkCell
{
public:
  static vtkTriangleStrip *New();
  vtkTypeMacro(vtkTriangleStrip,vtkCell);

  // Description:
  // See the vtkCell API for descriptions of these methods.
  vtkCell *MakeObject();
  int GetCellType() {return VTK_TRIANGLE_STRIP;};
  int GetCellDimension() {return 2;};
  int GetNumberOfEdges() {return this->GetNumberOfPoints();};
  int GetNumberOfFaces() {return 0;};
  vtkCell *GetEdge(int edgeId);
  vtkCell *GetFace(int vtkNotUsed(faceId)) {return 0;};
  int CellBoundary(int subId, float pcoords[3], vtkIdList *pts);
  void Contour(float value, vtkScalars *cellScalars, 
               vtkPointLocator *locator, vtkCellArray *verts, 
               vtkCellArray *lines, vtkCellArray *polys, 
               vtkPointData *inPd, vtkPointData *outPd,
               vtkCellData *inCd, int cellId, vtkCellData *outCd);
  void Clip(float value, vtkScalars *cellScalars, 
            vtkPointLocator *locator, vtkCellArray *polys,
            vtkPointData *inPd, vtkPointData *outPd,
            vtkCellData *inCd, int cellId, vtkCellData *outCd, int insideOut);
  int EvaluatePosition(float x[3], float closestPoint[3],
                       int& subId, float pcoords[3],
                       float& dist2, float *weights);
  void EvaluateLocation(int& subId, float pcoords[3], float x[3],
                        float *weights);
  int IntersectWithLine(float p1[3], float p2[3], float tol, float& t,
                        float x[3], float pcoords[3], int& subId);
  int Triangulate(int index, vtkIdList *ptIds, vtkPoints *pts);
  void Derivatives(int subId, float pcoords[3], float *values, 
                   int dim, float *derivs);

  // Description:
  // Return the center of the point cloud in parametric coordinates.
  int GetParametricCenter(float pcoords[3]);

  // Description:
  // Given a triangle strip, decompose it into a list of (triangle) 
  // polygons. The polygons are appended to the end of the list of triangles.
  void DecomposeStrip(int npts, int *pts, vtkCellArray *tris);
  
  // Description:
  // For legacy compatibility. Do not use.
  int CellBoundary(int subId, float pcoords[3], vtkIdList &pts)
    {return this->CellBoundary(subId, pcoords, &pts);}
  int Triangulate(int index, vtkIdList &ptIds, vtkPoints &pts)
    {return this->Triangulate(index, &ptIds, &pts);}
  

protected:
  vtkTriangleStrip();
  ~vtkTriangleStrip();
  vtkTriangleStrip(const vtkTriangleStrip&) {};
  void operator=(const vtkTriangleStrip&) {};

  vtkLine *Line;
  vtkTriangle *Triangle;
  
};

#endif


