def set_source_parameters(self, source_parameters):
"""Set current fillament source paerameters using dict
source_parameters is a dict with keys:
I -- Source current in amperes
endpoints -- 2x3 array with start and end coordinates of the source
"""
self.source_parameters = source_parameters
endpoints = source_parameters['endpoints']
delta = endpoints[1] - endpoints[0]
self.direction = unit_vector(delta)
self.length = vector_length(delta)
def calculate_voltage(self, start_pt, end_pt):
fn = self.field_function
delta = end_pt - start_pt
l_hat = unit_vector(delta)
# Evaluate E . l_hat where E is the electric field vector and
# l_hat is a unit vector along the integration path.
eval_fn = lambda l: np.dot(l_hat, fn(*(start_pt + delta * l)))
# Integrate over unit length
intg = romberg(eval_fn, 0, 1)
# Multiply by inteval length to de-normalise
interval_len = vector_length(delta)
intg = intg * interval_len
return intg
def calculate_voltage(self, start_pt, end_pt):
fn = self.field_function
delta = end_pt - start_pt
l_hat = unit_vector(delta)
# Evaluate E . l_hat where E is the electric field vector and
# l_hat is a unit vector along the integration path.
eval_fn = lambda l: np.dot(l_hat, fn(*(start_pt + delta*l)))
# Integrate over unit length
intg = romberg(eval_fn, 0, 1)
# Multiply by inteval length to de-normalise
interval_len = vector_length(delta)
intg = intg*interval_len
return intg
def _update(self):
if self._dirty:
self.source_start, self.source_end = self.source_endpoints
self.source_delta = self.source_end - self.source_start
self.vector_value = unit_vector(self.source_delta)*self.value
self._dirty == False