OpenCV——凸包

 #include <opencv2/opencv.hpp>
 #include <iostream>
 #include <math.h>

 using namespace cv;
 using namespace std;

 int main(int argc, char** argv)
 {
     Mat image(, , CV_8UC3);
     RNG rng = theRNG();//生成随机数

     while ()
     {
         char key;//键值
         int count = (unsigned)rng %  + ;//随机生成点的数量
         vector<Point> points;//点值

         //随机生成点坐标
         for (int i = ; i < count; i++)
         {
             Point point;
             point.x = rng.uniform(image.cols / , image.cols *  / );
             point.y = rng.uniform(image.rows / , image.rows *  / );

             points.push_back(point);

         }

         //检测凸包
         vector<int> hull;
         convexHull(Mat(points), hull, true);

         //绘制随机颜色的点
         image = Scalar::all();
         for (int i = ; i < count; i++)
             circle(image, points[i], , Scalar(rng.uniform(, ), rng.uniform(, ), rng.uniform(, )), rng.uniform(, ), FILLED, LINE_AA);

         //准备参数
         int hullcount = (int)hull.size();//凸包的边数
         Point point0 = points[hull[hullcount - ]];//连接凸包边的坐标

         //绘制凸包的边
         for (int i = ; i < hullcount; i++)
         {
             Point point = points[hull[i]];
             line(image, point0, point, Scalar(, , ), , LINE_AA);
             point0 = point;
         }

         imshow("效果图", image);

         key = (char)waitKey();
         if (key ==  | key == 'q' | key == 'Q')
             break;
     }
     return ;

 }