图像插入——线，椭圆，圆，文字，矩形，多边形，

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2\core\core.hpp> 
#include <opencv2/core/core_c.h>
#include <opencv2\objdetect\objdetect.hpp>  
#include <opencv2\imgproc\types_c.h>  



using namespace std;
using namespace cv;

Mat bgImage;

const char* drawdemo_win = "draw shapes and test demo";
//函数声明
void MyLines();
void MyRectangle();
void MyEllipse();
void MyCircle();
void MyPolygin();
void RandonLineDemo();

int main(int argc, char** argv)
{
	bgImage = imread("F:\\1.jpg");
	
	if (bgImage.empty())
	{
		printf("could not load image src...\n");
		return -1;
	}
	/*MyLines();//函数调用:划线
	MyRectangle();//函数调用：矩形
	MyEllipse();// 椭圆
	MyCircle();//圆
	MyPolygin();//多边形
	*/
	RandonLineDemo();

	//putText(bgImage, "Hi", Point(200, 200), FONT_HERSHEY_COMPLEX, 1.0, Scalar(0, 0, 255), 2, 8);//插入文字

	namedWindow("drawdemo_win", WINDOW_AUTOSIZE);
	imshow("drawdemo_win", bgImage);
	waitKey(0);
	return 0;
}
void MyLines()
{ 
	Point p1 = Point(20, 30);
	Point p2;
	p2.x = 700;
	p2.y = 700;
	Scalar color = Scalar(0, 0, 255);
	line(bgImage, p1, p2, color, 1, LINE_AA);//AA反锯齿

}

void MyRectangle()
{
   Rect rect = Rect(200, 100, 200, 200);//起始位置200,100 ；宽高为300，300
   Scalar color = Scalar(255, 0, 0);//定义色彩
   rectangle(bgImage, rect, color, 2, LINE_8);//2是线宽
}
void MyEllipse()
{
	Scalar color = Scalar(0, 25, 5);
	//point 椭圆中心；椭圆半径（长轴，短轴）；45是与x轴的角度；
	ellipse(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), Size(bgImage.cols / 4, bgImage.rows / 8), 45, 0, 240, color, LINE_8);
}
void MyCircle()
{

	Scalar color = Scalar(0, 255, 0);
	Point center = Point(bgImage.cols / 2, bgImage.rows / 2);//圆的中心

	circle(bgImage, center, 150, color, 8);
}

void MyPolygin()
{
	Point pts[1][5];
	pts[0][0] = Point(100, 100);
	pts[0][2] = Point(100, 200);
	pts[0][3] = Point(200, 100);
	pts[0][4] = Point(100, 100);

	const Point* ppts[] = { pts[0] };//point的指针
	int rpt[] = { 5 };//有5个指针
	Scalar color = Scalar(255, 255, 0);

	fillPoly(bgImage, ppts, rpt, 1, color, 8);//1和pts[1][5]中的1对应，rpt画在哪边
	
}

void RandonLineDemo() 
{
	RNG rng(12345);//RNG(int seed)         使用种子seed产生一个64位随机整数，默认-1
	Point pt1;
	Point pt2;
	Mat dst = Mat::zeros(bgImage.size(), bgImage.type());
	for (int i = 0; i < 100000; i++) {
		pt1.x = rng.uniform(0, dst.cols);//生成正态分布随机数uniform (int a, int b)
		pt2.x = rng.uniform(0, dst.cols);
		pt1.y = rng.uniform(0, dst.rows);
		pt2.y = rng.uniform(0, dst.rows);
		Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));//随机生成颜色
		if (waitKey(100) > 0) //100ms退出
		{
			break;
		}
		line(bgImage, pt1, pt2, color, 1, 8);
		imshow("RandonLineDemo", bgImage);
	}
}