// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkTriangleStrip
 * @brief   a cell that represents a triangle strip
 *
 * 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 "vtkCommonDataModelModule.h" // For export macro

VTK_ABI_NAMESPACE_BEGIN
class vtkLine;
class vtkTriangle;
class vtkIncrementalPointLocator;

class VTKCOMMONDATAMODEL_EXPORT vtkTriangleStrip : public vtkCell
{
public:
  static vtkTriangleStrip* New();
  vtkTypeMacro(vtkTriangleStrip, vtkCell);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  ///@{
  /**
   * See the vtkCell API for descriptions of these methods.
   */
  int GetCellType() override { return VTK_TRIANGLE_STRIP; }
  int GetCellDimension() override { return 2; }
  int GetNumberOfEdges() override { return this->GetNumberOfPoints(); }
  int GetNumberOfFaces() override { return 0; }
  vtkCell* GetEdge(int edgeId) override;
  vtkCell* GetFace(int vtkNotUsed(faceId)) override { return nullptr; }
  int CellBoundary(int subId, const double pcoords[3], vtkIdList* pts) override;
  void Contour(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
    vtkCellArray* verts, vtkCellArray* lines, vtkCellArray* polys, vtkPointData* inPd,
    vtkPointData* outPd, vtkCellData* inCd, vtkIdType cellId, vtkCellData* outCd) override;
  void Clip(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
    vtkCellArray* polys, vtkPointData* inPd, vtkPointData* outPd, vtkCellData* inCd,
    vtkIdType cellId, vtkCellData* outCd, int insideOut) override;
  ///@}

  int EvaluatePosition(const double x[3], double closestPoint[3], int& subId, double pcoords[3],
    double& dist2, double weights[]) override;
  void EvaluateLocation(int& subId, const double pcoords[3], double x[3], double* weights) override;
  int IntersectWithLine(const double p1[3], const double p2[3], double tol, double& t, double x[3],
    double pcoords[3], int& subId) override;
  int Triangulate(int index, vtkIdList* ptIds, vtkPoints* pts) override;
  void Derivatives(
    int subId, const double pcoords[3], const double* values, int dim, double* derivs) override;
  int IsPrimaryCell() override { return 0; }

  /**
   * Return the center of the point cloud in parametric coordinates.
   */
  int GetParametricCenter(double pcoords[3]) override;

  /**
   * Given a triangle strip, decompose it into a list of (triangle)
   * polygons. The polygons are appended to the end of the list of triangles.
   */
  static void DecomposeStrip(int npts, const vtkIdType* pts, vtkCellArray* tris);

protected:
  vtkTriangleStrip();
  ~vtkTriangleStrip() override;

  vtkLine* Line;
  vtkTriangle* Triangle;

private:
  vtkTriangleStrip(const vtkTriangleStrip&) = delete;
  void operator=(const vtkTriangleStrip&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif
