def act_speed(self, rpm=60, pref_unit=kmh):
""" Return a speed unit that represents the travelling speed when
turned at the given rpm.
Keyword Arguments:
rpm -- The rpm the wheel is turning (default 60)
pref_unit -- The desired speed unit to be returned
"""
self.circ = self._rolling_distance()
calc = std()
calc.speed = Unit(pref_unit)
calc.distance = self.circ
calc.distance.value *= rpm
calc.time = (Unit(minute, 1))
calc.calc()
self.speed = calc.speed
return self.speed
def __init__(self, time_string=None):
super(FormattedTime, self).__init__()
self.__vals = []
self._formattedTime = time_string
for v in self.definitions:
self.__vals.append(Unit(v, 0))
if time_string != None:
self.set_time(time_string)
def speed(self, front_ring, rear_ring, cadence=60, pref_unit=kmh):
""" Returns a speed_unit representing the achievable speed with
the given arguments.
Keyword arguments:
front_ring -- A gear_ring or chain_ring object
rear_ring -- A gear_ring or chain_ring object
cadence -- Optional cadence argument (default 60)
pref_unit -- the preferred rseulting speed unit. Must be a
speed_unit object as defined in speed_units
(default kmh)
"""
front_ring = self._ring_teeth(front_ring)
rear_ring = self._ring_teeth(rear_ring)
rpm = (float(front_ring) / rear_ring) * cadence
speed = self.wheel.act_speed(rpm)
speed = Unit(pref_unit, speed.convert_to(pref_unit))
return speed
def speed(self, front_ring, rear_ring, cadence=60, pref_unit=kmh):
""" Returns a speed_unit representing the achievable speed with
the given arguments.
Keyword arguments:
front_ring -- A gear_ring or chain_ring object
rear_ring -- A gear_ring or chain_ring object
cadence -- Optional cadence argument (default 60)
pref_unit -- the preferred rseulting speed unit. Must be a
speed_unit object as defined in speed_units
(default kmh)
"""
front_ring = self._ring_teeth(front_ring)
rear_ring = self._ring_teeth(rear_ring)
rpm = (float(front_ring) / rear_ring) * cadence
speed = self.wheel.act_speed(rpm)
speed = Unit(pref_unit, speed.convert_to(pref_unit))
return speed
def calc(self):
""" Calculate the unset value """
# Calculate speed
if self.speed.value == 0:
if self.distance.value > 0 and self.time.value > 0:
s = Unit(
speed_base,
self.distance.convert_to_base() /
self.time.convert_to_base())
self.speed.value = s.convert_to(self.speed)
return self.speed
else:
raise CalcError(self.speed.value, self.time.value,
self.distance.value)
# Calculate distance
if self.distance.value == 0:
if self.speed.value > 0 and self.time.value > 0:
d = Unit(
dist_base,
self.time.convert_to_base() / self.speed.convert_to_base())
self.distance.value = d.convert_to(self.distance)
return self.distance
else:
raise CalcError(self.speed.value, self.time.value,
self.distance.value)
# Calculate time
if self.time.value == 0:
if self.speed.value > 0 and self.distance.value > 0:
t = Unit(
time_base,
self.distance.convert_to_base() /
self.speed.convert_to_base())
self.time.value = t.convert_to(self.time)
return self.time
else:
raise CalcError(self.speed.value, self.time.value,
self.distance.value)
class std(object):
def __init__(self):
self.speed = Unit(speed_base)
self.distance = Unit(dist_base)
self.time = Unit(time_base)
def calc(self):
""" Calculate the unset value """
# Calculate speed
if self.speed.value == 0:
if self.distance.value > 0 and self.time.value > 0:
s = Unit(speed_base,
self.distance.convert_to_base() /
self.time.convert_to_base())
self.speed.value = s.convert_to(self.speed)
return self.speed
else:
raise CalcError(self.speed.value, self.time.value,
self.distance.value)
# Calculate distance
if self.distance.value == 0:
if self.speed.value > 0 and self.time.value > 0:
d = Unit(dist_base,
self.time.convert_to_base() /
self.speed.convert_to_base())
self.distance.value = d.convert_to(self.distance)
return self.distance
else:
raise CalcError(self.speed.value, self.time.value,
self.distance.value)
# Calculate time
if self.time.value == 0:
if self.speed.value > 0 and self.distance.value > 0:
t = Unit(time_base,
self.distance.convert_to_base() /
self.speed.convert_to_base())
self.time.value = t.convert_to(self.time)
return self.time
else:
raise CalcError(self.speed.value, self.time.value,
self.distance.value)
def _rolling_distance(self):
""" Return a float that represents the circumference of the wheel """
return Unit(inch, self.rim_size.value * pi)
def __init__(self, rim_size=26):
self.rim_size = Unit(inch, rim_size)
self.circ = self._rolling_distance()
self.speed = Unit(kmh)
def __init__(self):
self.speed = Unit(speed_base)
self.distance = Unit(dist_base)
self.time = Unit(time_base)
def __init__(self):
self.speed = Unit(speed_base)
self.distance = Unit(dist_base)
self.time = Unit(time_base)