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[Wang Hetao <>]

@ Alex Tsui:
Your advice is reasonable, I tried but it does not work.

I searched all functions of CGAL::Qt::CircularArcGraphicsItem class and
found this function: setVisible(). When it was added into my program, one
arc appeared:
http://cgal-discuss.949826.n4.nabble.com/file/n4655810/54%E7%9A%84%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png
 

Thx for Alex anyway.



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