Method head

dep/agg/include/agg_arrowhead.h:36–43

        arrowhead();

        void head(double d1, double d2, double d3, double d4)
        {
            m_head_d1 = d1;
            m_head_d2 = d2;
            m_head_d3 = d3;
            m_head_d4 = d4;
            m_head_flag = true;
        }

        void head()
        {