[Kstars-devel] Drawing comet tail patch

[Charles]

James Bowlin told me to use atan2 instead of correcting quadrant
myself to increase both speed and maintainability. So I'm submitting
the patch again, still wondering how to handle the situation when the
Sun is not on screen.

Thank you James.

btw, why doesn't kdeedu/CMakeLists.txt in the latest svn tree have a line
macro_optional_add_subdirectory(kstars)

-- 
Charles
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