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Rotating a rectangle

Started by Woody FX Jul 21, 2008 at 3:18 PM 1 replies 1.4k views

Original Post

Jul 21, 2008 at 3:18 PM

Hi guys. Is there a simple way to rotate a rectangle and keep track of the coordinates of each of the corners? Say for example we had a rectangle whoes corners were (0,0) (0,10) (5,10) (5,0). And if we were to rotate the rectangle by 45degrees clockwise. Is there a simple way to use that data to generate the new coordinates of the corners? I'm working on a device with no fixed point or floating point support, but I can work around that if I got some general idea of how to approach the problem. Thannks -Woody

Schildpad

Jul 21, 2008 at 3:55 PM

check this page http://en.wikipedia.org/wiki/Coordinate_rotation where it says "Two Dimensions"

Woody FX

Jul 21, 2008 at 5:11 PM

Thank you Schildpad :)

So if i read it correctly to get the new coordinate of the rotated x coordinate
is :
x(cos of the angle to rotate) + y(sin of the angle to rotate)

Thanks again,
-Woody

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