initial commit

samples/cpp/tutorial_code/snippets/imgproc_drawContours.cpp

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+#include "opencv2/imgproc.hpp"
+#include "opencv2/highgui.hpp"
+
+using namespace cv;
+using namespace std;
+
+int main( int argc, char** argv )
+{
+    Mat src;
+    // the first command-line parameter must be a filename of the binary
+    // (black-n-white) image
+    if( argc != 2 || !(src=imread(argv[1], 0)).data)
+        return -1;
+
+    Mat dst = Mat::zeros(src.rows, src.cols, CV_8UC3);
+
+    src = src > 1;
+    namedWindow( "Source", 1 );
+    imshow( "Source", src );
+
+    vector<vector<Point> > contours;
+    vector<Vec4i> hierarchy;
+
+    findContours( src, contours, hierarchy,
+        RETR_CCOMP, CHAIN_APPROX_SIMPLE );
+
+    // iterate through all the top-level contours,
+    // draw each connected component with its own random color
+    int idx = 0;
+    for( ; idx >= 0; idx = hierarchy[idx][0] )
+    {
+        Scalar color( rand()&255, rand()&255, rand()&255 );
+        drawContours( dst, contours, idx, color, FILLED, 8, hierarchy );
+    }
+
+    namedWindow( "Components", 1 );
+    imshow( "Components", dst );
+    waitKey(0);
+}