1 #include "opencv2/imgproc/imgproc.hpp"
2 #include "opencv2/highgui/highgui.hpp"
3 #include <fstream>
4 #include <iostream>
5
6 using namespace cv;
7 using namespace std;
8
help()9 static void help()
10 {
11 cout << "\nThis sample program demonstrates the use of the convexHull() function\n"
12 << "Call:\n"
13 << "./convexhull\n" << endl;
14 }
15
main(int,char **)16 int main( int /*argc*/, char** /*argv*/ )
17 {
18 Mat img(500, 500, CV_8UC3);
19 RNG& rng = theRNG();
20
21 help();
22
23 for(;;)
24 {
25 char key;
26 int i, count = (unsigned)rng%100 + 1;
27
28 vector<Point> points;
29
30 for( i = 0; i < count; i++ )
31 {
32 Point pt;
33 pt.x = rng.uniform(img.cols/4, img.cols*3/4);
34 pt.y = rng.uniform(img.rows/4, img.rows*3/4);
35
36 points.push_back(pt);
37 }
38
39 vector<int> hull;
40 convexHull(Mat(points), hull, true);
41
42 img = Scalar::all(0);
43 for( i = 0; i < count; i++ )
44 circle(img, points[i], 3, Scalar(0, 0, 255), FILLED, LINE_AA);
45
46 int hullcount = (int)hull.size();
47 Point pt0 = points[hull[hullcount-1]];
48
49 for( i = 0; i < hullcount; i++ )
50 {
51 Point pt = points[hull[i]];
52 line(img, pt0, pt, Scalar(0, 255, 0), 1,LINE_AA);
53 pt0 = pt;
54 }
55
56 imshow("hull", img);
57
58 key = (char)waitKey();
59 if( key == 27 || key == 'q' || key == 'Q' ) // 'ESC'
60 break;
61 }
62
63 return 0;
64 }
65