# set a gradient as the fill color
cmykRadialGradient(
    (300, 300),                                     # startPoint
    (600, 600),                                     # endPoint
    [(1, 0, 0, 1), (0, 0, 1, 0), (0, 1, 0, .2)],    # colors
    [0, .2, 1],                                     # locations
    0,                                              # startRadius
    500                                             # endRadius
    )
# draw a rectangle
rect(10, 10, 980, 980)