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#!/usr/bin/env python
# encoding: utf-8
from pyo import *
class TriTable(PyoTableObject):
"""
Square waveform generator.
Generates square waveforms made up of fixed number of harmonics.
:Parent: :py:class:`PyoTableObject`
:Args:
order : int, optional
Number of harmonics square waveform is made of. The waveform will
contains `order` odd harmonics. Defaults to 10.
size : int, optional
Table size in samples. Defaults to 8192.
>>> s = Server().boot()
>>> s.start()
>>> t = TriTable(order=15).normalize()
>>> a = Osc(table=t, freq=[199,200], mul=.2).out()
"""
def __init__(self, order=10, size=8192):
PyoTableObject.__init__(self, size)
self._order = order
self._tri_table = HarmTable(self._create_list(order), size)
self._base_objs = self._tri_table.getBaseObjects()
self.normalize()
def _create_list(self, order):
# internal method used to compute the harmonics's weight
l = []
ph = 1.0
for i in range(1, order * 2):
if i % 2 == 0:
l.append(0)
else:
l.append(ph / (i * i))
ph *= -1
return l
def setOrder(self, x):
"""
Change the `order` attribute and redraw the waveform.
:Args:
x : int
New number of harmonics
"""
self._order = x
self._tri_table.replace(self._create_list(x))
self.normalize()
self.refreshView()
@property
def order(self):
"""int. Number of harmonics triangular waveform is made of."""
return self._order
@order.setter
def order(self, x):
self.setOrder(x)
# Run the script to test the TriTable object.
if __name__ == "__main__":
s = Server().boot()
t = TriTable(10, 8192)
t.view()
a = Osc(t, 500, mul=0.3).out()
s.gui(locals())
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