基本程式碼，這個我自己沒有實驗

 1 #include "../common/common.hpp"
 2 
 3     static Mat bgImage;
 4     static void drawLines();
 5     static void drawRectangle();
 6     static void drawEllipse();
 7     static void drawCircle();
 8     static void drawPolygon();
 9     static void drawRandomLine();
10 
11     void
 
 main1_8(int argc, char** argv)
12     {
13         bgImage = imread(getCVImagesPath("images/test1.png"), IMREAD_COLOR);
14         drawLines();
15         drawRectangle();
16         drawEllipse();
17         drawCircle();
18         drawPolygon();
19         //引數：Mat，文字(不識別中文?)，文字的位置(錨點?)，字型，縮放，顏色，線寬，線型別
 

20         putText(bgImage, "Hello OpenCV", Point(0, 200), CV_FONT_HERSHEY_COMPLEX, 1.0, Scalar(0), 3, LINE_8);//繪製文字
21         imshow("src", bgImage);
22 
23         drawRandomLine();
24 
25         waitKey(0);
26     }
27 
28     void drawLines()//繪製線條
29     {
30         Point p1 = Point(20, 30);//Point表示平面上的點，OpenCV中的這些座標值都是相對於影象本身畫素值的
 

31         Point p2;
32         p2.x = 400;
33         p2.y = 400;
34         Scalar color = Scalar(0, 0, 255);
35         line(bgImage, p1, p2, color, 10, LINE_AA);//繪製線條到Mat，10是線寬、LINE_4或LINE_8是帶鋸齒的，LINE_AA是抗鋸齒的
36     }
37 
38     void drawRectangle()//繪製矩形
39     {
40         //OpenCV的座標系，原點在螢幕左上角，x朝右正，y朝下正
41         Rect rect = Rect(200, 100, 300, 300);//起始位置x、y，寬，高
42         Scalar color = Scalar(255, 0, 0);
43         rectangle(bgImage, rect, color, LINE_8);//繪製矩形到Mat，自帶圓角。。
44     }
45 
46     void drawEllipse()//繪製橢圓
47     {
48         int width = bgImage.cols;
49         int height = bgImage.rows;
50         Scalar color = Scalar(0, 255, 0);
51         //繪製橢圓，引數：Mat，中心點，橢圓的長短軸半徑，橢圓的朝向(0表示水平)，起始角度，終點角度
52         ellipse(bgImage, Point(width / 2, height / 2), Size(width / 4, height / 8), 0, 0, 270, color, 2, LINE_8);
53     }
54 
55     void drawCircle()//繪製圓
56     {
57         Scalar color = Scalar(0, 255, 255);
58         circle(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), 150, color, 2, LINE_8);
59     }
60 
61     void drawPolygon()//繪製多邊形，繪製的多邊形是填充的
62     {
63         Point pts[1][5];
64         pts[0][0] = Point(100, 100);
65         pts[0][1] = Point(100, 200);
66         pts[0][2] = Point(200, 200);
67         pts[0][3] = Point(200, 100);
68         pts[0][4] = Point(100, 100);
69 
70         const Point * ppts[] = { pts[0] };
71         int npt[] = { 5 };
72         Scalar color = Scalar(255, 0, 255);
73         //引數：Mat，頂點資料指標，頂點個數，1表示只繪製一個contour(輪廓)
74         fillPoly(bgImage, ppts, npt, 1, color, LINE_8);
75     }
76 
77     void drawRandomLine()//迴圈繪製隨機位置隨機顏色的線段
78     {
79         Mat randomLineMat = Mat::zeros(bgImage.size(), bgImage.type());
80         RNG rng(12345);//生成高斯隨機數，引數種子
81         Point p1, p2;
82         for (int i = 0; i < 100000; i++)
83         {
84             p1.x = rng.uniform(0, randomLineMat.cols);//生成正態分佈 0-bgImage.cols 範圍內的隨機數
85             p1.y = rng.uniform(0, randomLineMat.rows);
86             p2.x = rng.uniform(0, randomLineMat.cols);
87             p2.y = rng.uniform(0, randomLineMat.rows);
88             Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
89             if (waitKey(50) > 0)//引數delay如果傳0表示阻塞等待鍵盤事件，傳大於0表示只阻塞等待delay毫秒，鍵盤無響應返回-1
90             {
91                 break;
92             }
93             line(randomLineMat, p1, p2, color, 1, LINE_8);
94             imshow("randomLine", randomLineMat);
95         }
96     }