opencvcartToPolar笛卡尔坐标转极坐标

cartToPolar 

#include<opencv2/opencv.hpp>
#include<iostream>
#include  <vector>


int main(int argc, char** argv) {

    std::vector<cv::Point2f> sides;//建立容器存坐标
    sides.push_back(cv::Point2f(3, 4));
    sides.push_back(cv::Point2f(6, 8));
    sides.push_back(cv::Point2f(1, 1));

    cv::Mat xpts(sides.size(), 1, CV_32FC1);
    xpts.at<float>(0, 0) = sides[0].x;
    xpts.at<float>(1, 0) = sides[1].x;
    xpts.at<float>(2, 0) = sides[2].x;

    cv::Mat ypts(sides.size(), 1, CV_32F);
    ypts.at<float>(0, 0) = sides[0].y;
    ypts.at<float>(1, 0) = sides[1].y;
    ypts.at<float>(2, 0) = sides[2].y;

    std::cerr << xpts << std::endl;
    std::cerr << ypts << std::endl;

    cv::Mat magnitude, angle;
    cartToPolar(xpts, ypts, magnitude, angle);//笛卡尔坐标转极坐标
    /*
    参数1:x坐标矩阵    n行1列
    参数2:y坐标矩阵    n行1列
    参数3:极径矩阵   
    参数4:极角矩阵   根据atan2(y, x) 算出来的  单位:弧度
    */

    std::cerr << magnitude << std::endl;
    std::cerr << angle << std::endl;

    std::cerr << atan2(1, 1)<<std::endl;;

    cv::waitKey(0);
    return 0;
}