VC 绘图技巧--自定义形状图形

自定义形状图形，定义几个点围城的图形，然后进行描边和填充：

if (m_memDC.m_hDC!=NULL)
    {
        CPoint point[4];
        point[0].x=nLeft+(int)(0.1*m_nWidth);
        point[0].y=m_nYmargin;

        point[1].x=nLeft+(int)(0.9*m_nWidth);
        point[1].y=m_nYmargin;

        point[2].x=nLeft+(int)(0.7*m_nWidth);
        point[2].y=(int)(0.2*m_nWidth)+m_nYmargin;

        point[3].x=nLeft+(int)(0.3*m_nWidth);
        point[3].y=(int)(0.2*m_nWidth)+m_nYmargin;

        CBrush br(m_crText);  //文字颜色
        CRgn rgn;
        rgn.CreatePolygonRgn(point,4,ALTERNATE);  //由所有点围城的不规则矩形
        m_memDC.FillRgn(&rgn,&br);   //填充该段

        br.DeleteObject();  //释放画刷
        rgn.DeleteObject();

        m_memDC.MoveTo(point[0]);
        m_memDC.LineTo(point[1]);

        m_memDC.MoveTo(point[1]);
        m_memDC.LineTo(point[2]);

        m_memDC.MoveTo(point[2]);
        m_memDC.LineTo(point[3]);

        m_memDC.MoveTo(point[3]);
        m_memDC.LineTo(point[0]);
    }