1、概述

　　案例：使用opencv在一张图片上绘制线、圆、椭圆、矩形

2、示例图片

3、示例代码

#include <opencv2/opencv.hpp>
#include <iostream>
 
using namespace cv;
using namespace std;
 
 
int main(int argc, char const *argv[])
{
    /* 绘制线、圆、椭圆、矩形 */
    Mat src = imread("girl.jpg");
    if(!src.data){
        cout << "can't not found image"<<endl;
        return -1;
    }
 
    //绘制线
    Point p1 = Point(20,30);
    Point p2;
    p2.x = 400;
    p2.y = 400;
    Scalar color(0,0,255);
    line(src,p1,p2,color,LINE_8);
     
 
    //绘制矩形
    Rect rect = Rect(200,100,300,300);
    Scalar color2 = Scalar(255,0,0);
    rectangle(src,rect,color,2,LINE_8);
 
 
    //绘制椭圆
    Scalar color3 = Scalar(0, 255, 0);
    ellipse(src, Point(src.cols / 2, src.rows / 2), Size(src.cols / 4, src.rows / 8), 90, 0, 360, color3, 2, LINE_8);
 
    //绘制圆
    Scalar color4 = Scalar(0, 255, 255);
    Point center = Point(src.cols / 2, src.rows / 2);
    circle(src, center, 150, color4, 2, 8);
 
    //填充一个矩形
    Point pts[1][5];
    pts[0][0] = Point(100, 100);
    pts[0][1] = Point(100, 200);
    pts[0][2] = Point(200, 200);
    pts[0][3] = Point(200, 100);
    pts[0][4] = Point(100, 100);
    const Point* ppts[] = { pts[0] };
    int npt[] = { 5 };
    Scalar color5 = Scalar(255, 12, 255);
    fillPoly(src, ppts, npt, 1, color5, 8);
 
    //展示图片
    imshow("src",src);
    waitKey(0);
 
    return 0;
}

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