init - 初始化项目

samples/cpp/minarea.cpp

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+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+static void help()
+{
+    cout << "This program demonstrates finding the minimum enclosing box, triangle or circle of a set\n"
+         << "of points using functions: minAreaRect() minEnclosingTriangle() minEnclosingCircle().\n"
+         << "Random points are generated and then enclosed.\n\n"
+         << "Press ESC, 'q' or 'Q' to exit and any other key to regenerate the set of points.\n\n";
+}
+
+int main( int /*argc*/, char** /*argv*/ )
+{
+    help();
+
+    Mat img(500, 500, CV_8UC3, Scalar::all(0));
+    RNG& rng = theRNG();
+
+    for(;;)
+    {
+        int i, count = rng.uniform(1, 101);
+        vector<Point> points;
+
+        // Generate a random set of points
+        for( i = 0; i < count; i++ )
+        {
+            Point pt;
+            pt.x = rng.uniform(img.cols/4, img.cols*3/4);
+            pt.y = rng.uniform(img.rows/4, img.rows*3/4);
+
+            points.push_back(pt);
+        }
+
+        // Find the minimum area enclosing bounding box
+        Point2f vtx[4];
+        RotatedRect box = minAreaRect(points);
+        box.points(vtx);
+
+        // Find the minimum area enclosing triangle
+        vector<Point2f> triangle;
+        minEnclosingTriangle(points, triangle);
+
+        // Find the minimum area enclosing circle
+        Point2f center;
+        float radius = 0;
+        minEnclosingCircle(points, center, radius);
+
+        img = Scalar::all(0);
+
+        // Draw the points
+        for( i = 0; i < count; i++ )
+            circle( img, points[i], 3, Scalar(0, 0, 255), FILLED, LINE_AA );
+
+        // Draw the bounding box
+        for( i = 0; i < 4; i++ )
+            line(img, vtx[i], vtx[(i+1)%4], Scalar(0, 255, 0), 1, LINE_AA);
+
+        // Draw the triangle
+        for( i = 0; i < 3; i++ )
+            line(img, triangle[i], triangle[(i+1)%3], Scalar(255, 255, 0), 1, LINE_AA);
+
+        // Draw the circle
+        circle(img, center, cvRound(radius), Scalar(0, 255, 255), 1, LINE_AA);
+
+        imshow( "Rectangle, triangle & circle", img );
+
+        char key = (char)waitKey();
+        if( key == 27 || key == 'q' || key == 'Q' ) // 'ESC'
+            break;
+    }
+
+    return 0;
+}