opencv-polylines多边形
polylines 画多边形
方式一
cv::Mat src(600, 600, CV_8UC3, cv::Scalar(0,0,0)); //创建多边形的点 cv::Point points[2][4]; points[0][0] = cv::Point(100, 115); points[0][1] = cv::Point(255, 135); points[0][2] = cv::Point(140, 365); points[0][3] = cv::Point(100, 300); points[1][0] = cv::Point(300, 315); points[1][1] = cv::Point(555, 335); points[1][2] = cv::Point(340, 565); points[1][3] = cv::Point(300, 500); //ppt[]要同时添加两个多边形顶点数组的地址头 const cv::Point* pts[] = { points[0],points[1] }; //npts[]要定义每个多边形的定点数 int npts[] = { 4,4 }; cv::polylines(src, pts, npts, 2, true, cv::Scalar(255,0,0), 5, 8, 0); /* 参数1:作为画布的矩阵 参数2:pts 折线顶点数组 参数3:npts 折线顶点个数 参数4:待绘制折线数 参数5:是否是闭合折线(多边形) 参数6:折线的颜色 参数7:折线粗细 参数8:线段类型 8或4 参数9:缩放比例(0是不缩放,4是1/4) */ cv::namedWindow("src"); cv::imshow("src", src); cv::waitKey(); return 0;
方式二
cv::Mat src(600, 600, CV_8UC3, cv::Scalar(0,0,0)); //创建多边形的点 std::vector<cv::Point> pts; pts.push_back(cv::Point(100, 115)); pts.push_back(cv::Point(255, 135)); pts.push_back(cv::Point(140, 365)); pts.push_back(cv::Point(100, 300)); cv::polylines(src, pts,true, cv::Scalar(255,0,0), 5, 8, 0); /* 参数1:作为画布的矩阵 参数2:pts 折线顶点数组 参数3:是否是闭合折线(多边形) 参数4:折线的颜色 参数5:折线粗细 参数6:线段类型 8或4 参数7:缩放比例(0是不缩放,4是1/4) */ cv::namedWindow("src"); cv::imshow("src", src); cv::waitKey(); return 0;
注意:两种方式参数2的数据类型不同