Drawing OpenCV logo

logo.cpp

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <cmath>
#include <algorithm>

using namespace cv;
using namespace std;


class Logo
{
    const int d1;
    const int d2;
    const int l;
    const float h;
    const float r1;
    const float r2;
    const int delta;

    inline void drawOne(Mat & image, Point center, double angle1, double angle2, Scalar color) const
    {
        const Size axes1(round(r1), round(r1));
        const Size axes2(round(r2), round(r2));
        vector<Point> pts1;
        vector<Point> pts2;
        ellipse2Poly(center, axes1, 0, angle1, angle2, delta, pts1);
        ellipse2Poly(center, axes2, 0, angle1, angle2, delta, pts2);
        copy(pts1.rbegin(), pts1.rend(), back_inserter(pts2));
        // polylines(image, pts2, true, color);
        vector<vector<Point>> polygons;
        polygons.push_back(pts2);
        fillPoly(image, polygons, color, LINE_AA);
    }

public:
    Logo(int d1_, int d2_, int l_) :
        d1(d1_),
        d2(d2_),
        l(l_),
        h(l * sqrt(3.f) / 2.f),
        r1(d1 / 2.f),
        r2(d2 / 2.f),
        delta(1)
    {
    }
    Size size() const
    {
        return Size(d2 + l, round(d2 + h));
    }
    void draw(Mat & image, Point shift = Point(0, 0)) const
    {
        drawOne(image, shift + Point(round(r2 + l/2), round(r2)), 120, 360 + 60, Scalar(1, 1, 0x4F));
        drawOne(image, shift + Point(round(r2), round(r2 + h)), 0, 300, Scalar(1, 0x4F, 1));
        drawOne(image, shift + Point(round(r2 + l), round(r2 + h)), -60, 240, Scalar(0x4F, 1, 1));
    }

};

Mat image;

int main( int argc, char** argv ){

    Mat image(800, 800, CV_8UC3, Scalar::all(0));

    Logo logo(150, 205, 300);
    const Size sz = image.size() - logo.size();
    const int NUM = 10000;
    TickMeter tm;
    tm.start();
    for (int i = 0; i < NUM; ++i)
        logo.draw(image, Point(sz.width - 1, sz.height - 1));
    tm.stop();
    cout << "Time: " << tm.getTimeSec() * 1000 / NUM << " ms" << endl;

    namedWindow( "img", WINDOW_AUTOSIZE );
    imshow( "img", image );

    waitKey(0);
    return 0;
}