//描述：包含程序所使用的头文件和命名空间

#include <opencv2/opencv.hpp>

#include "opencv2/core/core.hpp"

#include "highgui.h"

#include "opencv2/imgproc/imgproc.hpp"

using namespace cv;

using namespace std;

//宏定义部分

#define WINDOW_NAME1 "[绘制图1]"

#define WINDOW_NAME2 "[绘制图2]"

#define WINDOW_WIDTH 600

//绘制椭圆，代码分析：把图画在img上，在椭圆中心为(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2)，并且大小位于矩形(WINDOW_WIDTH / 4, WINDOW_WIDTH / 16)内。旋转角度为angle,扩展的弧度为0到360度。默认染色是蓝色，线宽为2，线性为9

void DrawEllipse(Mat img, double angle) {

int thickness = 2;

int lineType = 8;

ellipse(img,

Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2),

Size(WINDOW_WIDTH / 4, WINDOW_WIDTH / 16),

angle,

0,

360,

Scalar(255, 129, 0),

thickness,

lineType);

}

//绘制实心圆，把图画在img上，圆中心为WINDOW_WIDTH / 32，Scalar(0, 0, 255)颜色为红色，线宽为2，线性为9

void DrawFilledCircle(Mat img, Point center) {

int thickness = -1;

int lineType = 8;

circle(img,

center,

WINDOW_WIDTH / 32,

Scalar(0, 0, 255),

thickness,

lineType);

}

//主函数

int main(void) {

//创建空白的MAT图像

Mat atomImage = Mat::zeros(WINDOW_WIDTH,WINDOW_WIDTH,CV_8UC3);

Mat rookImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3);

//先绘制出椭圆

DrawEllipse( atomImage,90);

DrawEllipse(atomImage, 0);

DrawEllipse(atomImage, 45);

DrawEllipse(atomImage, -45);

//再绘制圆心

DrawFilledCircle(atomImage,Point(WINDOW_WIDTH/2,WINDOW_WIDTH/2));

//显示图像

imshow(WINDOW_NAME1,atomImage);

cvMoveWindow(WINDOW_NAME1,0,200);

/*imshow(WINDOW_NAME2, rookImage);

cvMoveWindow(WINDOW_NAME2, WINDOW_WIDTH, 200);*/

waitKey(0);

return 0;

}

注意：在编写函数时必须注意把函数写在主函数上，才能正确调用。