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Re^2: Check if line is straight

by Anonymous Monk
on May 16, 2011 at 20:14 UTC ( #905143=note: print w/replies, xml ) Need Help??

in reply to Re: Check if line is straight
in thread Check if line is straight

This is pretty neat, saves a lot of code. What is the best way to add tolerance to this? any suggestions ? Thanks

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Re^3: Check if line is straight
by lidden (Curate) on May 16, 2011 at 23:13 UTC
    return abs(($x2-$x1)*($y-$y1)-($x-$x1)*($y2-$y1)) < $tolerance;

    Update added abs()

Re^3: Check if line is straight
by pajout (Curate) on May 17, 2011 at 11:30 UTC
    It depends if you mean tolerance necessary for dealing floats - lidden suggested it already. But if you mean real tolerance, for instance "path is correct if the angle between two vectors is less than 1 degree", you should really compute that value.

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