圆覆盖的问题

Question

我想画两圆一点求切圆的图形.
可是有了两圆以后,第三个圆总是会覆盖了前两个圆.
我想让三个同时显示到屏幕上.dc.Ellipse(x1-r1,y1-r1,x1+r1,y1+r1);
dc.Ellipse(x2-r2,y2-r2,x2+r2,y2+r2);
dc.Ellipse(xx1-r,yy1-r,xx1+r,yy1+r);VC刚学不是太懂.请大家不吝赐教.

Answer 1

dc.SelectStockObject(NULL_BRUSH);
放在 绘制椭圆代码前面

Answer 2

CBrush* pOldBrush = (CBrush*)dc.SelectStockObject(NULL_BRUSH);
dc.Ellipse(x1-r1,y1-r1,x1+r1,y1+r1); 
dc.Ellipse(x2-r2,y2-r2,x2+r2,y2+r2); 
dc.Ellipse(xx1-r,yy1-r,xx1+r,yy1+r); 
dc.SelectObject(pOldBtush);