triangles.h

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#pragma once
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

//----- Included files ---------------------------------------------------------

// 3. Standard Library Headers
#include <vector>

// 4. External Library Headers
#include <xmscore/points/pt.h>

// 5. Shared Headers
#include <xmscore/stl/vector.h>

// 6. Non-shared Headers

//----- Namespace declaration --------------------------------------------------

namespace xms
{
//----- Constants / Enumerations -----------------------------------------------

//----- Forward declarations ---------------------------------------------------

//----- Structs / Classes -----------------------------------------------------

//----- Function prototypes ----------------------------------------------------

double trArea(const Pt3d& a_pt1, const Pt3d& a_pt2, const Pt3d& a_pt3);
void trBuildGridPolys(int rows, int cols, VecPt3d& pts, VecInt2d& polys);
void trBuildGridTrianglePolys(int rows, int cols, VecPt3d& a_points, VecInt2d& a_polys);

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
inline int trIncrementIndex(int i)
{
  static const int plus1mod3[3] = {1, 2, 0};
  return plus1mod3[i];
}
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
inline int trDecrementIndex(int i)
{
  static const int minus1mod3[3] = {2, 0, 1};
  return minus1mod3[i];
}

} // namespace xms