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"""
07-moving-points.py - Periodically rewrite a break-point function table.
This example shows how we can dynamically modify a function table to create a
curve that varies over time.
Note: Rewriting a large table can produce xruns in the audio output. Usually,
for this kind of processes, we want to keep the table size relatively small.
"""
from pyo import *
s = Server().boot()
# Initialize an empty table.
table = LinTable([(0, 0), (255, 0)], size=256)
table.view()
# Two LFOs whose values will change the center points in the table.
lfo1 = Sine(0.1, phase=0.75, mul=0.5, add=0.5)
lfo2 = Sine(0.15, phase=0.75, mul=0.5, add=0.5)
def create_line():
"Function to create a new line."
lst = [(0, 0)] # First point of the table at value 0.
lst.append((8, lfo1.get())) # Second point, from first LFO.
lst.append((128, lfo2.get())) # Third point, from second LFO.
lst.append((255, 0)) # Last point of the table at value 0.
# Replace the table content with the new list of points.
table.replace(lst)
# Call the function "create_line" every 50 ms.
pat = Pattern(function=create_line, time=0.05).play()
# Little test case...
amp = Osc(table, freq=4, mul=0.4)
synth = RCOsc(freq=[99.5, 100], sharp=0.3, mul=amp).out()
s.gui(locals())
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