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"""
08-function-calls.py - Using custom algorithms with python function calls.
**EventCall** ::
EventCall(function, *args, occurrences=inf, stopEventsWhenDone=True)
EventCall calls a function, with any number of arguments (\*args) and uses
its return value for the given parameter. The example below use a function
from the random module, *randrange*, with arguments and a user-defined
function, without argument, to create a rising, then falling, amplitude curve.
"""
import random
from pyo import *
s = Server().boot()
db = -30
dir = 1
def riseFallAmp():
"Rises and falls amplitude between -30 and -3 dB, 1 db at the time."
global db, dir
db += dir
if db >= -3:
dir = -1
elif db < -30:
dir = 1
return db
# Midi notes are chosen randomly with a function from the random module,
# while the amplitude change according to the riseFallAmp function's output.
e = Events(
midinote=EventCall(random.randrange, 48, 72, 3),
beat=1 / 4.0,
db=EventCall(riseFallAmp),
attack=0.001,
decay=0.05,
sustain=0.5,
release=0.005,
).play()
s.gui(locals())
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