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Laurens Valk
b8505ff218
Currently, Pybricks has system patterns for builtin lights.
This adds a user method to set such a pattern.
For example, an indefinite sine pattern could be specified by
def fade(time):
return sin(time/2000/pi)*50+50
hub.light.pattern(fade, 1000)
or a blinking pattern using
def blink(time):
if time >= 1000:
return 100
else:
return 0
hub.light.pattern(blink, 2000)
or briefly:
hub.light.pattern(lambda t: 100 if t >= 1000 else 0, 2000)
This combines the best of simplicity and efficiency: The user doesn't
have to calculate and provide an expensive list of floating points, but
provide a clean and adaptable method instead.
By sampling, we maintain a fixed length pattern which we can preallocate
for the hub lights, and the samples are calculated only once and the
callable may be garbage collected if given as lambda. Also, any
exceptions will be caught immediately during the one-off evaluation.