Rotate an xy cooordinate about a specified origin

rotate point.py

def RotateXY(x,y,xc=0,yc=0,angle=0,units='DEGREES'):
    """Rotate an xy cooordinate about a specified origin
    returning a new xy cooordinate

    x,y      xy coordinates
    xc,yc   center of rotation
    angle   angle
    units    "DEGREES" (default) or "RADIANS"
    """
    import math
    x = x - xc
    y = y - yc
    if units == 'DEGREES':
        angle = math.radians(angle)
    xr = (x * math.cos(angle)) - (y * math.sin(angle)) + xc
    yr = (x * math.sin(angle)) + (y * math.cos(angle)) + yc
    return xr, yr