#!/usr/bin/env python3
#------------------------------------------------------------------------
# isobar: ex-lsystem-stochastic
#
# Generates a stochastic L-system arpeggio
#------------------------------------------------------------------------
import isobar as iso
import logging
logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(message)s")
notes = iso.PLSystem("N[+N--?N]+N[+?N]", depth=4)
notes = iso.PDegree(notes, iso.Scale.majorPenta)
notes = notes % 36 + 52
timeline = iso.Timeline(180)
timeline.schedule({"note": notes, "duration": 0.25})
timeline.run()
def test_plsystem():
a = iso.PLSystem("N[-N++N]-N", 1)
assert list(a) == [0, -1, 1, -1]
a = iso.PLSystem("N[-N++N]-N", 2)
assert list(a) == [0, -1, 1, -1, -2, -3, -1, -3, -1, -2, 0, -2, -2, -3, -1, -3]
import isobar as iso
import logging
logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(message)s")
#------------------------------------------------------------------------
# Generate a set of pitches based on an l-system, with recursive depth 4.
# symbols:
# N = generate note node
# + = transpose up one semitone
# - = transpose down one semitone
# [ = enter recursive branch
# ] = leave recursive branch
#------------------------------------------------------------------------
notes = iso.PLSystem("N+[+N+N--N+N]+N[++N]", depth=4)
notes = notes + 60
#------------------------------------------------------------------------
# use another l-system to generate time intervals.
# take absolute values so that intervals are always positive.
#------------------------------------------------------------------------
times = iso.PLSystem("[N+[NN]-N+N]+N-N+N", depth=3)
times = iso.PAbs(iso.PDiff(times)) * 0.25
#------------------------------------------------------------------------
# ...and another l-system for amplitudes.
#------------------------------------------------------------------------
velocity = (iso.PLSystem("N+N[++N+N--N]-N[--N+N]") + iso.PWhite(-4, 4)) * 8
velocity = iso.PAbs(velocity)
#!/usr/bin/env python3
#------------------------------------------------------------------------
# isobar: ex-lsystem-grapher
#
# Generates an L-system and its ASCII representation.
#------------------------------------------------------------------------
import isobar as iso
import logging
logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(message)s")
seq = iso.PLSystem("N[+N+N]?N[-N]+N", depth=3)
notes = seq.all()
note_min = min(notes)
note_max = max(notes)
for note in seq:
note = note - note_min
print("#" * note)