1 #include <opencv2\opencv.hpp> 2 #include <iostream> 3 #include <string> 4  5 #pragma comment( linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" ) 6  7 #define NUMBER 20 8  9 using namespace std;10 using namespace cv;11 12 void Show(std::string name,Mat img)13 {14     namedWindow(name, CV_WINDOW_AUTOSIZE);15     imshow(name, img);16 }17 18 static Scalar randomColor(RNG &rng)19 {20     return Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));21 }22 23 void Drawing_Random_Lines(Mat img, char *win_name, RNG& rng)24 {25     int linetype = 8;26     int w = 400;27     Point pt1, pt2;28     int x_1 = 0, x_2 = w;29 30     for (int i = 0; i < NUMBER; ++i)31     {32         pt1.x = rng.uniform(x_1, x_2);33         pt1.y = rng.uniform(x_1, x_2);34         pt2.x = rng.uniform(x_1, x_2);35         pt2.y = rng.uniform(x_1, x_2);36 37         line(img, pt1, pt2, randomColor(rng), rng.uniform(1, 10), 8);38         Show(win_name, img);39     }40 }41 42 void Display_Random_Text(Mat img, char *win_name, RNG &rng)43 {44     int linetype = 8;45     int w = 400;46     int x1 = 0, x2 = w;47 48     for (int i = 0; i < NUMBER; ++i)49     {50         Point org;51         org.x = rng.uniform(x1, x2);52         org.y = rng.uniform(x1, x2);53 54         putText(img, "Testing Text", org, rng.uniform(0, 8), rng.uniform(0, 100)*0.05 + 0.1, randomColor(rng), rng.uniform(1, 10), linetype);55 56         Show(win_name, img);57     }58 }59 60 void Display_Big_End(Mat img, char* win_name, RNG rng)61 {62     int w = 400;63     Size textSize = getTextSize("OpenCV Forever", CV_FONT_HERSHEY_COMPLEX, 3, 5, 0);64     Point org((w - textSize.width) / 2, (w + textSize.height) / 2);65     int linetype = 8;66 67     Mat img2;68 69     for (int i = 0; i < NUMBER; ++i)70     {71         img2 = img - Scalar::all(i);72         putText(img2, "OpenCV Forever", org, CV_FONT_HERSHEY_COMPLEX, 3, Scalar(i, i, 255), 5, linetype);73 74         Show(win_name, img2);75     }76 }77 78 int main()79 {80     int w = 400;81     RNG rng(0xFFFFFFFF);82     char *win_name = "Drawing";83     Mat img = Mat::zeros(w, w, CV_8UC3);84 85     Drawing_Random_Lines(img, win_name, rng);86     //Drawing_Random_Rectangle(img, win_name, rng);87     //Drawing_Random_Ellipse(img, win_name, rng);88     //Drawing_Random_Polylines(img, win_name, rng);89     //Drawing_Random_FilledPolygon(img, win_name, rng);90     //Drawing_Random_Circle(img, win_name, rng);91     Display_Random_Text(img, win_name, rng);92     Display_Big_End(img, win_name, rng);93 94     waitKey();95     return 0;96 }

 1 enum 2 { 3     FONT_HERSHEY_SIMPLEX = 0, 4     FONT_HERSHEY_PLAIN = 1, 5     FONT_HERSHEY_DUPLEX = 2, 6     FONT_HERSHEY_COMPLEX = 3, 7     FONT_HERSHEY_TRIPLEX = 4, 8     FONT_HERSHEY_COMPLEX_SMALL = 5, 9     FONT_HERSHEY_SCRIPT_SIMPLEX = 6,10     FONT_HERSHEY_SCRIPT_COMPLEX = 7,11     FONT_ITALIC = 1612 };13 14 //! renders text string in the image15 CV_EXPORTS_W void putText( Mat& img, const string& text, Point org,16                          int fontFace, double fontScale, Scalar color,17                          int thickness=1, int lineType=8,18                          bool bottomLeftOrigin=false );19 20 //! returns bounding box of the text string21 CV_EXPORTS_W Size getTextSize(const string& text, int fontFace,22                             double fontScale, int thickness,23                             CV_OUT int* baseLine);