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http://mathworld.wolfram.com/Circle-LineIntersection.html has a formula for circle line intersection, with the line being infinite. You could use that, and if there's intersection, check if at least one of the intersection points lies between the end points of your line segment.

In reply to Re: Some simple 2d game-related maths questions by JavaFan
in thread Some simple 2d game-related maths questions by skx

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    [LanX]: what are temps?
    [moritz]: oh, the question was about creation, not indexing
    [thepkd]: temporary variables
    [moritz]: [ { a => [ { b => 1 } ] } ]
    [choroba]: dereference ne creation
    [choroba]: at least in my lingo
    [moritz]: .oO( oh temps, oh moritz )
    [GotToBTru]: you are correct, choroba, but of course there is no point in doing one without the other
    [GotToBTru]: un less you're working on write-only memory
    [1nickt]: my $x = $aohoaoh->[0]->{' foo'}->[0]->{'bar' }; should work

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