bokeh.driving¶
Provide a set of decorators useful for repeatedly updating a a function parameter in a specified way each time the function is called.
These decorators can be especially useful in conjunction with periodic callbacks in a Bokeh server application.
Example
As an example, consider the bounce forcing function, which
advances a sequence forwards and backwards:
from bokeh.driving import bounce
@bounce([0, 1, 2])
def update(i):
print(i)
If this function is repeatedly called, it will print the following sequence on standard out:
0 1 2 2 1 0 0 1 2 2 1 ...
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bounce(sequence)[source]¶ Return a driver function that can advance a “bounced” sequence of values.
seq = [0, 1, 2, 3] # bounce(seq) => [0, 1, 2, 3, 3, 2, 1, 0, 0, 1, 2, ...]
Parameters: sequence (seq) – a sequence of values for the driver to bounce
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cosine(w, A=1, phi=0, offset=0)[source]¶ Return a driver function that can advance a sequence of cosine values.
value = A * cos(w*i + phi) + offset
Parameters:
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force(f, sequence)[source]¶ Return a decorator that can “force” a function with an arbitrary supplied generator
Parameters: sequence (iterable) – generator to drive f with Returns: decorator
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linear(m=1, b=0)[source]¶ Return a driver function that can advance a sequence of linear values.
value = m * i + b
Parameters:
-
repeat(sequence)[source]¶ Return a driver function that can advance a repeated of values.
seq = [0, 1, 2, 3] # repeat(seq) => [0, 1, 2, 3, 0, 1, 2, 3, 0, 1, ...]
Parameters: sequence (seq) – a sequence of values for the driver to bounce