Orientation.h

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#ifndef GfxTL__ORIENTATION_HEADER__
#define GfxTL__ORIENTATION_HEADER__
 
#include <GfxTL/VectorXD.h>
 
namespace GfxTL
{
    template< class ScalarT >
    inline ScalarT Orientation(const VectorXD< 2, ScalarT >& p1,
                               const VectorXD< 2, ScalarT >& p2,
                               const VectorXD< 2, ScalarT >& c)
    {
        return ((p1[0] - c[0]) * (p2[1] - c[1])) -
               ((p1[1] - c[1]) * (p2[0] - c[0]));
    }
};
 
#endif