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from .simplenode import SimpleNode
from gettext import gettext as _
import math
class Sine(SimpleNode):
"""Node representing the sine function: f(x) = sin(x)."""
CLASS = "sine"
background = SimpleNode.loadbackground("sine.svg")
title = _("Sine")
description = _(u"Returns the ratio of the length of a side opposite an "
u"acute angle in a right trianale to the length of the hypotenuse.\n"
u"For example, sin(pi / 4) = 1 / sqrt(2)")
def __call__(self, x):
"""Calls the sine function."""
return math.sin(x)
def get_equation_string(self, variable):
"""Returns sin(x) given x."""
return "sin(%s)" % variable
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