Equation for rotating a point around a center:
(x2,y2) = resulting rotated point
(x1,y1) = original point before rotation
(xc,yc) = center of rotation
x2 = xc+(x1-xc)*cos(angle)-(y1-yc)*sin(angle)
y2 = yc+(x1-xc)*sin(angle)+(y1-yc)*cos(angle)

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