#ifdef HAS_OPENCV3
#include <opencv2/core.hpp> //Any OPENCV3 code
#else
#include <opencv2/core/core.hpp> //Any Opencv2 code
#endif

double dist(cv::Point, cv::Point);
double inner_angle(cv::Point, cv::Point, cv::Point);
cv::Point map_point(double, cv::Point, cv::Point);