polar coord on polar plane

arturv

Guest

« on: March 29, 2012, 02:52:49 AM »

Hello people of math

I want to generate polar coordinates on polar plane. I have r₂ but don’t really know how to find θ₂ properly

Code:

// polar coordinates
r = sqrt( s*s + t*t );
th = atan( s, t );

a = 0.2  // r coordinate of new polar centre
b = 3.1  // theta coordinate of new polar centre

r2 = r*r-2*r*a*cos(th-b)+a*a; // calculating new r
th2 = atan( r - a, th - b ); // calculating new theta using cartesian equation

so I’m using cartesian equation to find th2 but obviously its not really correct. There is some bending in theta direction and other issues when crossing the centre etc..

Just wondering if anyone knows a proper equation

Thanks


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arturv

Guest

Re: polar coord on polar plane

« Reply #1 on: March 29, 2012, 02:57:22 AM »

actually, maybe I should ask this question in math section?


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DarkBeam

Global Moderator
Fractal Senior

Posts: 2512

Fragments of the fractal -like the tip of it

Re: polar coord on polar plane

« Reply #2 on: March 29, 2012, 11:45:43 AM »

Quote from: arturv on March 29, 2012, 02:57:22 AM

actually, maybe I should ask this question in math section?

Maybe.


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No sweat, guardian of wisdom!

arturv

Guest

Re: polar coord on polar plane

« Reply #3 on: March 30, 2012, 02:01:15 AM »

got it

theta' = arctan([r sin(theta)-r0sin(theta0)]/[r cos(theta)-r0cos(theta0)])

or

theta' = atan2(r sin(theta) - r0 sin(theta0), r cos(theta) - r0 cos(theta0))


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