Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!apple!motcsd!hpda!hpcuhb!hp-ses!hpdml93!libbyb
From: libbyb@hpdml93.HP.COM (Libby Bagley)
Newsgroups: comp.graphics
Subject: Re: Line Math
Message-ID: <390001@hpdml93.HP.COM>
Date: 27 Jul 89 19:19:17 GMT
References: <QYmDXdy00W0HE1u0ZG@andrew.cmu.edu>
Organization: Hewlett Packard - Boise, ID
Lines: 12

/ hpdml93:comp.graphics / js9b+@andrew.cmu.edu (Jon C. Slenk) /  4:44 pm  Jul 22, 1989 /
This is a somewhat simplistic question: Given two points (a and b,
defining a line), how can I calculate a points that is x units from
point a along that line?


What's wrong with linear interpolation?
  x = (1-t) * a   + t * b

where,
      t is units usually [0,1] 
      a,b,x are points (either two or three dimensional)