opencv3/C++绘制几何图形实例分享！

在图像上绘制几何图形

  #include<iostream>  #include<opencv2/opencv.hpp>  using namespace cv;    Mat src1, dst;  void drawRectangle();  void drawLine();  void drawEllipse();  void drawCircle();  void tsxt();    int main()  {    src1 = imread("E:/image/image/daibola.jpg");    dst = src1.clone();      if(src1.empty())    {      printf("can not load image n");      return -1;    }    drawRectangle();    drawLine();    drawEllipse();    drawCircle();    tsxt();    cvNamedWindow("output", CV_WINDOW_AUTOSIZE);    imshow("output", dst);    waitKey();    return 0;  }  void drawRectangle()  {    Rect rect = Rect(150,30,250,250);    Scalar color = Scalar(0,255,255);    rectangle(dst,rect,Scalar(0,255,255),2);  }  void drawLine()  {    line(dst, Point(450,0),Point(450,150),Scalar(255,0,50),2);  }  void drawEllipse()  {    ellipse(dst,Point(100,100),Size(50,90),0.0,0.0,360,Scalar(255,255,0),2);  }  void drawCircle()  {    circle(dst,Point(100,100),60,Scalar(255,0,255),2);  }    void tsxt()  {    putText(dst, "Image",Point(300,330),5,3.0,Scalar(255,0,90),2);  }  

随机绘制大小不等的圆：

  #include<opencv2/opencv.hpp>  using namespace cv;    Mat dst, src1;  void randomCircle();  int main()  {    src1 = imread("E:/image/image/daibola.jpg");    dst = Mat::zeros(src1.size(),src1.type());    randomCircle();    return 0;  }    void randomCircle()  {    RNG rng(0);    Point p1;    int r;    for(int i =0; i < 10000; i++)    {      p1.x = rng.uniform(0, dst.cols);      p1.y = rng.uniform(0, dst.rows);      r = rng.uniform(0, dst.rows/3);      Scalar color = Scalar(rng.uniform(0,255), rng.uniform(0, 255), rng.uniform(0, 255));      if(waitKey(100) > 0)      {        break;      }      circle(dst,p1,r,color,2);      imshow("circle", dst);    }  }

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