自学教程：OpenCV

#include <opencv2/core/core.hpp>#include <opencv2/imgproc/imgproc.hpp>#include <opencv2/highgui/highgui.hpp>using namespace cv;using namespace std;#define WINDOW_WIDTH 600 // 定义窗口大小的宏#define WINDOW_NAME1 "原子图"        //为窗口标题定义的宏 #define WINDOW_NAME2 "多边形图以及画线"        //为窗口标题定义的宏 /***绘制椭圆***/void DrawEllipse(Mat img, double angle){    int thickness = 2; //  线宽    int lineType = 8; // 线性，8 代表联通线性    ellipse(img,        Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2),        Size(WINDOW_WIDTH / 4, WINDOW_WIDTH / 16),        angle, // 角度，0~360 度        0,        360,        Scalar(255, 129, 0),        thickness,        lineType);}/*绘制实心圆*/void DrawFilledCircle(Mat img, Point center)    int thickness = -1; //  线粗-1，代表实心    circle(img,        center,        WINDOW_WIDTH / 32,        Scalar(0, 0, 255),/*凹多边形绘制*/void DrawPolygon(Mat img)    int lineType = 8;    // 创建一些点    Point rookPoints[1][20];    rookPoints[0][0] = Point(WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8);    rookPoints[0][1] = Point(3 * WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8);    rookPoints[0][2] = Point(3 * WINDOW_WIDTH / 4, 13 * WINDOW_WIDTH / 16);    rookPoints[0][3] = Point(11 * WINDOW_WIDTH / 16, 13 * WINDOW_WIDTH / 16);    rookPoints[0][4] = Point(19 * WINDOW_WIDTH / 32, 3 * WINDOW_WIDTH / 8);    rookPoints[0][5] = Point(3 * WINDOW_WIDTH / 4, 3 * WINDOW_WIDTH / 8);    rookPoints[0][6] = Point(3 * WINDOW_WIDTH / 4, WINDOW_WIDTH / 8);    rookPoints[0][7] = Point(26 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8);    rookPoints[0][8] = Point(26 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4);    rookPoints[0][9] = Point(22 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4);    rookPoints[0][10] = Point(22 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8);    rookPoints[0][11] = Point(18 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8);    rookPoints[0][12] = Point(18 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4);    rookPoints[0][13] = Point(14 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4);    rookPoints[0][14] = Point(14 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8);    rookPoints[0][15] = Point(WINDOW_WIDTH / 4, WINDOW_WIDTH / 8);    rookPoints[0][16] = Point(WINDOW_WIDTH / 4, 3 * WINDOW_WIDTH / 8);    rookPoints[0][17] = Point(13 * WINDOW_WIDTH / 32, 3 * WINDOW_WIDTH / 8);    rookPoints[0][18] = Point(5 * WINDOW_WIDTH / 16, 13 * WINDOW_WIDTH / 16);    rookPoints[0][19] = Point(WINDOW_WIDTH / 4, 13 * WINDOW_WIDTH / 16);    const Point* ppt[1] = { rookPoints[0] }; // 多边形定点集    int npt[] = { 20 }; // 多边形定点数目    fillPoly(img,         ppt,         npt,         1,         Scalar(255, 255, 255),  // 多边形颜色：白色/*线绘制*/void DrawLine(Mat img, Point start, Point end)    int thickness = 2;    line(img,        start,        end,        Scalar(0,0,0), // 黑色int main(int argc, char ** argv)    Mat atomImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3);    Mat rookImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3);    // 椭圆绘制    DrawEllipse(atomImage, 0);    DrawEllipse(atomImage, 90);    DrawEllipse(atomImage, 45);    DrawEllipse(atomImage, -45);    // 绘制圆心    DrawFilledCircle(atomImage, Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2));    // 绘制多边形    DrawPolygon(rookImage);    // 绘制矩形    rectangle(rookImage,        Point(0, 7 * WINDOW_WIDTH / 8),        Point(WINDOW_WIDTH, WINDOW_WIDTH),        Scalar(0, 255, 255),        -1,        8);    // 绘制一些线段    DrawLine(rookImage, Point(0, 15 * WINDOW_WIDTH / 16), Point(WINDOW_WIDTH, 15 * WINDOW_WIDTH / 16));    DrawLine(rookImage, Point(WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8), Point(WINDOW_WIDTH / 4, WINDOW_WIDTH));    DrawLine(rookImage, Point(WINDOW_WIDTH / 2, 7 * WINDOW_WIDTH / 8), Point(WINDOW_WIDTH / 2, WINDOW_WIDTH));    DrawLine(rookImage, Point(3 * WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8), Point(3 * WINDOW_WIDTH / 4, WINDOW_WIDTH));    // ---------------------------<3>显示绘制出的图像------------------------    imshow(WINDOW_NAME1, atomImage);    moveWindow(WINDOW_NAME1, 0, 200);    imshow(WINDOW_NAME2, rookImage);    moveWindow(WINDOW_NAME2, WINDOW_WIDTH, 200);    waitKey(0);    return(0);