How can I rotate a shape in 2D space?

[fcs04001]

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.

 

[wysard]

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.

Sin of (y) and Cos of (x)

Think of a unit circle ( a cicle of Radius 1 around the origin)

 

[ozymandias]

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.

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Assaf
http://www.physicallyincorrect.com/"

 

[fcs04001]

I got it:
[x'; y'] = [cos(theta) sin(theta); -sin(theta) cos(theta)][x; y]

Thanks.