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Thread: Arc Degrees

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  1. Nov 8th, 2011, 01:39 PM #2
    jemidiah
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    Re: Arc Degrees

    I'll answer the questions in your diagram. It shouldn't be hard to convert to code.

    We're given a circle centered at (CX, CY) of radius R. There is an arc starting at (CX + R, CY) going counterclockwise a length L. The arc's angle D is related to the other parameters by L = DR, where D is measured in radians. [For instance, if L = 2*pi*R, L is the entire circumference, forcing D = 2*pi.] That is, D = L/R. The coordinates are then just

    (E, F) = (CX + R*cos(D), CY + R*sin(D))
    Last edited by jemidiah; Nov 8th, 2011 at 01:43 PM. Reason: Swapped notation to be consistent with the original post
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