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CClientDC dc(this);
CPoint points[3]; //定义三个点
points[0].x = cx - 45;
points[0].y = cy + 45;
points[1].x = cx;
points[1].y = cy - 45;
points[2].x = cx + 45;
points[2].y = cy + 45;
dc.Polygon (points, 3);//绘制三角形