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Re: Move point x towards point y
Posted:
Oct 17, 2012 1:48 PM
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dpb <none@non.net> wrote in message <k5mmg1$19k$1@speranza.aioe.org>...
> On 10/17/2012 9:40 AM, Pascal wrote:
> ...
>
> > I want to know how to calculate the coordinates of the new point 2 (the
> > one that moves 1.0 unit to point 1).
>
> What's the definition of 1.0 unit(s)???
>
> --
Presumably it's the same as the units for point 1 and point 2.
This is an elementary algebra problem.
Pascal (I hope that's your real name and you're not taking the name of a great mathematician) - here are the steps:
1. Calculate the slope of the line between P1 and P1: m = (P2(2) - P1(2))/(P2(1) - P1(1)).
2. Find the point on the line one unit from P2: P2 + [dx,dx], where
dx^2 + dy^2 = 1, and
dy/dx = m
Good luck.
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