Blocking False

Example script (scamp): examples/Tutorial/03_blocking_false.py

Download: 03_blocking_false.py

By default play_note blocks execution until the note is done playing. This is very useful for playing a melody, since you simply call play_note in sequence for every note of the melody. However, one simple way of allowing notes to overlap — if desired — is to pass the keyword argument blocking=False. This is essentially a single-note fork: playback continues on to the next line without waiting for the note to finish.

Topics: Time & clocks › Forking & simultaneity

# import the scamp namespace
from scamp import *
# construct a session object
s = Session()
# add a new violin part to the session
violin = s.new_part("Violin")

# start playing a 2-beat C, but return immediately
violin.play_note(60, 1, 2, blocking=False)
# wait for only one beat
wait(1)
# start playing a 2-beat E, blocking this time
violin.play_note(64, 1, 2)

for pitch in [67, 72, 60, 64, 67, 72]:
    # play notes that are a whole beat long...
    violin.play_note(pitch, 1, 1, blocking=False)
    # ...waiting only half a beat in between
    wait(0.5)

# a note is still playing when we reach the end of the script.
# Without this line, it gets cut off prematurely; this keeps the script alive until it finished
wait_for_children_to_finish()