PixelFarm.Agg.VertexStore.SwapVertices C# (CSharp) Method

        internal void SwapVertices(int v1, int v2)
        {
            double x_tmp = m_coord_xy[v1 << 1];
            double y_tmp = m_coord_xy[(v1 << 1) + 1];
            m_coord_xy[v1 << 1] = m_coord_xy[v2 << 1];//x
            m_coord_xy[(v1 << 1) + 1] = m_coord_xy[(v2 << 1) + 1];//y
            m_coord_xy[v2 << 1] = x_tmp;
            m_coord_xy[(v2 << 1) + 1] = y_tmp;
            byte cmd = m_cmds[v1];
            m_cmds[v1] = m_cmds[v2];
            m_cmds[v2] = cmd;
        }

        static void InvertPolygon(VertexStore myvxs, int start, int end)
        {
            int       i;
            VertexCmd tmp_PathAndFlags = myvxs.GetCommand(start);

            --end; // Make "end" inclusive
            // Shift all commands to one position
            for (i = start; i < end; i++)
            {
                myvxs.ReplaceCommand(i, myvxs.GetCommand(i + 1));
            }
            // Assign starting command to the ending command
            myvxs.ReplaceCommand(end, tmp_PathAndFlags);

            // Reverse the polygon
            while (end > start)
            {
                myvxs.SwapVertices(start++, end--);
            }
        }