Misterija :D

void Rotiraj(const Tacka &t, double ugao) {
        double bX = t.first  + (B.first - t.first) * std::cos(ugao) - (B.second - t.second) * std::sin(ugao);
        double bY = t.second + (B.first - t.first) * std::sin(ugao) + (B.second - t.second) * std::cos(ugao);
        A.first  = t.first  + (A.first - t.first) * std::cos(ugao) - (A.second - t.second) * std::sin(ugao);
        A.second = t.second + (A.first - t.first) * std::sin(ugao) + (A.second - t.second) * std::cos(ugao);
        B.first  = bX;
        B.second = bY;
        C.first  = t.first  + (C.first - t.first) * std::cos(ugao) - (C.second - t.second) * std::sin(ugao);
        C.second = t.second + (C.first - t.first) * std::sin(ugao) + (C.second - t.second) * std::cos(ugao);
    }