CV_SEQ_POLYLINE  1445 modules/core/include/opencv2/core/types_c.h #define CV_SEQ_POLYGON         (CV_SEQ_FLAG_CLOSED | CV_SEQ_POLYLINE )
CV_SEQ_POLYLINE  1598 modules/imgproc/src/contours.cpp             cvStartWriteSeq( CV_SEQ_ELTYPE_POINT | CV_SEQ_POLYLINE | CV_SEQ_FLAG_CLOSED,