c++ - OpenCV sort points stored in Point2f vector -


i trying sort result returned minarearect using the following algorithm:

here's code now:

void sortpoints(point2f* unsorted) {      point2f sorted[4];      (int = 0; < 4; i++) sorted[i] = point(0, 0);      float middlex = (unsorted[0].x + unsorted[1].x + unsorted[2].x + unsorted[3].x) / 4;     float middley = (unsorted[0].y + unsorted[1].y + unsorted[2].y + unsorted[3].y) / 4;      (int = 0; < 4; i++) {         if (unsorted[i].x < middlex && unsorted[i].y < middley) sorted[0] = unsorted[i];         if (unsorted[i].x > middlex && unsorted[i].y < middley) sorted[1] = unsorted[i];         if (unsorted[i].x < middlex && unsorted[i].y > middley) sorted[2] = unsorted[i];         if (unsorted[i].x > middlex && unsorted[i].y > middley) sorted[3] = unsorted[i];     }      unsorted = sorted;  }  ...  vector<rotatedrect> minrect( contours.size() );  for( int = 0; < contours.size(); i++ ) {       minrect[i] = minarearect( mat(contours[i]) ); }  point2f rect_points[4];   for( int = 0; < contours.size(); i++ ) {      minrect[i].points( rect_points );      sortpoints( rect_points ); /* ...they not sorted after calling sortpoints?!? */ }

but it's not working, no compile error, points not sorted. think there's wrong data types.

the algorithm provided works if 4 points belong rectangle parallel x-y axis. way try return result not work properly. try copying sorted array unsorted. for ( int i=0;i<4;++i ) unsorted[i] = sorted[i];

but there way can use

#include <algorithm> struct str{     bool operator() ( point2f a, point2f b ){         if ( a.y != b.y )              return a.y < b.y;         return a.x <= b.x ;     } } comp;  int main() { point2f v[4]; v[0] = point2f(0,1); v[1] = point2f(-1,1); v[2] = point2f(2,1); v[3] = point2f(4,1);  sort(v,v+4,comp); }

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