triangle.py

import itertools
from saw import saw as saw
import operator as o


class triangle(saw):

    """provides a triangle wave."""

    def __init__(self, scale=1, steps=100, pos=True, forward=True):
        saw.__init__(self, scale, steps, pos)
        self.forward = forward
        if forward:
            self.oper = o.ge
            if pos:
                self.comp = scale * 2
                self.reset = 0
            else:
                self.comp = scale
                self.reset = -steps
        else:
            self.oper = o.le
            if pos:
                self.comp = 0
                self.reset = steps * 2
            else:
                self.comp = -scale
                self.reset = steps
        self.stepn = self.reset

    def step(self):
        newNum = saw.step(self)
        if self.oper(newNum, self.comp):
            self.stepn = self.reset
        self.num = newNum
        return self.num

if(__name__ == "__main__"):
    test = triangle(10, 40, False)
    for _ in itertools.repeat(None, 200):
        print(test.step())