opencv3/C++绘制几何图形实例

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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