def extend(self, start, length):
if length == 0:
return start
direction = sign(length)
length = abs(length)
next_value = start - start % 1 + (direction > 0)
difference = norm(self[start] - self[next_value])
length -= difference
#
while length > 0:
if (next_value > len(self) and direction > 0) or (next_value < 0 and direction < 0):
break
start = next_value
next_value += direction
difference = norm(self[next_value] - self[start])
length -= difference
# Length is smaller than zero
length = length
return next_value + direction * length * abs(next_value - start) / difference
def extend(self, start, length):
if length == 0:
return start
direction = sign(length)
length = abs(length)
next_value = start - start % 1 + (direction > 0)
difference = norm(self[start] - self[next_value])
length -= difference
#
while length > 0:
if (next_value > len(self)
and direction > 0) or (next_value < 0 and direction < 0):
break
start = next_value
next_value += direction
difference = norm(self[next_value] - self[start])
length -= difference
# Length is smaller than zero
length = length
return next_value + direction * length * abs(next_value -
start) / difference
def get_positions(self, start=0, stop=None, step=None):
stop = stop if stop is not None else len(self) - 1
start = start if start is not None else 0
if step is not None and step < 0:
start, stop = stop, start
if start == stop:
return [start]
step = sign(stop - start)
if step > 0:
start_round = max(int(start) + 1, 0)
stop_round = min(
int(stop) + (1 if stop % 1 > 0 else 0),
len(self) - 1)
else:
start_round = min(
int(start) - (0 if start % 1 > 0 else 1),
len(self) - 1)
stop_round = max(int(stop), 0)
values = [start] + list(range(start_round, stop_round, step)) + [stop]
return values
def get_length(self, first=0, second=None):
"""
Get the (normative) Length of a Part of the Vectorlist.
"""
if not second:
second = len(self) - 1
direction = sign(float(second - first))
length = 0
next_value = int(first - first % 1 + (direction > 0))
# Just to fasten up
if next_value > len(self) and direction < 0:
next_value = len(self)
elif next_value < 0 < direction:
next_value = 0
while next_value * direction < second * direction:
length += norm(self[next_value] - self[first])
first = next_value
next_value += direction
# Fasten up aswell
if (next_value > len(self) and direction > 0) or (next_value < 0 and direction < 0):
break
return length + norm(self[second] - self[first])
def get_length(self, first=0, second=None):
"""
Get the (normative) Length of a Part of the Vectorlist.
"""
if second is None:
second = len(self) - 1
direction = sign(float(second - first))
length = 0
next_value = int(first - first % 1 + (direction > 0))
# Just to fasten up
if next_value > len(self) and direction < 0:
next_value = len(self)
elif next_value < 0 < direction:
next_value = 0
while next_value * direction < second * direction:
length += norm(self[next_value] - self[first])
first = next_value
next_value += direction
# Fasten up aswell
if (next_value > len(self)
and direction > 0) or (next_value < 0 and direction < 0):
break
return length + norm(self[second] - self[first])
