C++ Eclipse – removing invisible segments

I wrote a program which is drawing the ellipse. I must still do, removing invisible segments (the ones which are behind the ellipse). For me could somebody help? I have no idea how to do it.

It is a code of the program, becouse the code is very long, it pasted on pastebin.com – http://pastebin.com/i3vmAFz9 .

Source: eclipse

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