Le_Forgeron wrote:
> Why do you need the sloperate of your 2D line ?
> why not computing the angle of the slope instead, using atan2 ?
> With the angle instead of the slope, no more issue with vertical line.
> 
> (atan2() result would be in radian, just in case you would be wondering)

It's for a 2D line intersection macro, and the way I learned how to 
perform that makes use of classic Coordinate Geometry.

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