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Math: Finding a point that is perpendicular to another point.
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Topic: Math: Finding a point that is perpendicular to another point. (Read 2055 times)
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aaranaf
Newbie
Posts: 4
Math: Finding a point that is perpendicular to another point.
«
on:
August 03, 2013, 01:23:52 am »
So here's what I want to do. I want to find the point in 2d-space for C.
I have the point A and B and the distance from B to C.
I know C is perpendicular to B. If someone could point me in the right direction on this it would be greatly appreciated.
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The Hatchet
Full Member
Posts: 135
Re: Math: Finding a point that is perpendicular to another point.
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Reply #1 on:
August 03, 2013, 02:08:38 am »
Go to google and put in "find point perpendicular to line"
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rgrant1993
Newbie
Posts: 12
Re: Math: Finding a point that is perpendicular to another point.
«
Reply #2 on:
August 03, 2013, 08:25:55 pm »
We need to know the data you have recorded inorder to know the data we need to find.
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Grimshaw
Hero Member
Posts: 631
Nephilim SDK
Re: Math: Finding a point that is perpendicular to another point.
«
Reply #3 on:
August 03, 2013, 08:37:41 pm »
(direction from A to B)
V = B - A
V' = normalize(V)
(vector orthogonal to V' - perpendicular)
O = (-V'y, V'x)
(finally find point C by going from B in the orthogonal direction)
C = B + O * distance
I am a little fuzzy right now but if something is wrong here ill get back to you
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gostron
Jr. Member
Posts: 53
Re: Math: Finding a point that is perpendicular to another point.
«
Reply #4 on:
August 05, 2013, 01:02:44 pm »
May I add that knowing the distance and that it's perpendicular gives your two points, one for each side.
for a vector defined by (a,b) an orthogonal vector would be (-b, a) (so I do agree with Grimshaw, just to say it a bit differently)
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Math: Finding a point that is perpendicular to another point.