用Polygon来填充,例如你的雪花的各个顶点如下
POINT pt1[5];
pt1[0] = CPoint(445,75);
pt1[1] = CPoint(440,83);
pt1[2] = CPoint(420,110);
pt1[3] = CPoint(408,155);
pt1[4] = CPoint(435,155);
CBrush brush1(RGB(255,0,0));
dc.SelectObject(&brush1);
dc.Polygon(pt1,5);