Bézier curves

in Draw:
#if 1
    m_pa[i] = m_pa[0];  // close the shape
    Polyline(dc, m_pa, sides + 1);
#else
    CPoint  pt2[200];
    int j = 0;
    for (int i = 0; i < sides; i++) {
        pt2[j++] = m_pa[i];
        if (i & 1)
            pt2[j++] = CPoint(m_pa[i].x, m_pa[i].y);
    }
    pt2[j++] = pt2[0];
    PolyBezier(dc, pt2, j);
#endif