Why is a gap observed when drawing a circle in TCL/TK in Red Hat Enterprise Linux 6 and 7?
Issue
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A gap is observed when drawing a circle( Image 1 ) , even spikes on the left and right edges of the circle( Image 2) when using TCL/TK.
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Image 1 :

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Image 2 :

Environment
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 6
- tk-8.5.13-4.el7 and tcl-8.5.13-4.el7
- tk-8.5.7-5.el6 and tcl-8.5.7-6.el6
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