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Rotating a shape in space

  1. Dec 3, 2007 #1
    How do I rotate some shape in 2d space? That is, what factor do I multiply the x and y components to rotate my shape?

    Thanks.
     
  2. jcsd
  3. Dec 4, 2007 #2
    Sin of (y) and Cos of (x)

    Think of a unit circle ( a cicle of Radius 1 around the origin)
     
  4. Dec 4, 2007 #3
    Before we can answer that unambiguously, you must first of all explain how you "encode" your shape, that is: how you store the information about your shape and how you "draw" it, or specify its position and angle.

    --------
    Assaf
    http://www.physicallyincorrect.com/" [Broken]
     
    Last edited by a moderator: May 3, 2017
  5. Dec 4, 2007 #4
    I got it:
    [x'; y'] = [cos(theta) sin(theta); -sin(theta) cos(theta)][x; y]

    Thanks.
     
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