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left:
top:
The formula used for this spiral is:

     left(t) = t * cos(t) + xcenter
     top(t) = t * sin(t) + ycenter

Left is the number of pixels from the left of the screen and top is the number of pixels from the top of the screen. The range of t is [0,24π]. the step of t is 0.15.

I got this formula from Vanderbilt.edu.

The behavior of this function is inexplicable. I don't know why it accelerates and decelerates, but it does.