c++ - Using my own sort to sort 2D vertices clockwise -

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so have vector of vertices i'm trying sort , i'm new using predicates. current sort vertices.

void triangulate::ordervertices() {      std::sort(mvertices.begin(), mvertices.end(), triangulate::clockwise()); }

and sorting predicate

bool triangulate::clockwise::operator()(const cvertex2& pointa, const cvertex2& pointb) {     if(pointa.mpoint.x >= 0 && pointb.mpoint.x < 0)     {         return true;     }      if(pointa.mpoint.x == 0 &&  pointb.mpoint.x == 0)     {         return true;     }          // gets center of current viewport     cvertex2 centercoordinate(cclipper::instance()->getmidx(), cclipper::instance()->getmidy());       // compute cross product of vectors     int det = (int)((pointa.mpoint.x - centercoordinate.mpoint.x) *                      (pointb.mpoint.y - centercoordinate.mpoint.y) -                      (pointb.mpoint.x - centercoordinate.mpoint.x) *                     (pointa.mpoint.y - centercoordinate.mpoint.y));      if(det < 0)     {         return true;     }      if(det > 0)     {         return false;     }      int det1 = (int)((pointa.mpoint.x - centercoordinate.mpoint.x) *                          (pointa.mpoint.x - centercoordinate.mpoint.x) +                          (pointa.mpoint.y - centercoordinate.mpoint.y) *                          (pointa.mpoint.y - centercoordinate.mpoint.y));      int det2 = (int)((pointb.mpoint.x - centercoordinate.mpoint.x) *                         (pointb.mpoint.x - centercoordinate.mpoint.x) +                         (pointb.mpoint.y - centercoordinate.mpoint.y) *                         (pointb.mpoint.y - centercoordinate.mpoint.y));      return det1 > det2; }

i have predicate set within triangulate class so.

class triangulate {     friend class clockwise; public:      triangulate(std::vector<cvertex2>& vertices)         :mvertices(vertices) {}     ~triangulate(void);      class clockwise     {     public:         bool operator()(const cvertex2& pointa, const cvertex2& pointb);     };  private: };

when error , i'm pretty sure because didn't set right. can help?


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