B @\@sdZddlmZmZmZmZddlZeeZ ddl m Z dZ ddZ dd d Zd d Zd dZdddZddZdddZddZdS)a 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: .. code-block:: python 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: .. code-block:: none 0 1 2 2 1 0 0 1 2 2 1 ... )absolute_importdivisionprint_functionunicode_literalsN)partial)bouncecosinecountforcelinearrepeatsinecs&tfdd}ttt|dS)a Return a driver function that can advance a "bounced" sequence of values. .. code-block:: none seq = [0, 1, 2, 3] # bounce(seq) => [0, 1, 2, 3, 3, 2, 1, 0, 0, 1, 2, ...] Args: sequence (seq) : a sequence of values for the driver to bounce cs6t|\}}|ddkr"|S|dSdS)Nr)divmod)iZdivmod)Nsequence,lib/python3.7/site-packages/bokeh/driving.pyfXs zbounce..f)r)lenrr _advance)rrr)rrrrIsrrcs0ddlmfdd}ttt|dS)a Return a driver function that can advance a sequence of cosine values. .. code-block:: none value = A * cos(w*i + phi) + offset Args: w (float) : a frequency for the cosine driver A (float) : an amplitude for the cosine driver phi (float) : a phase offset to start the cosine driver with offset (float) : a global offset to add to the driver values r)coscs|S)Nr)r)Aroffsetphiwrrroszcosine..f)r)mathrrr r)rrrrrr)rrrrrrr`s rcCstttdddS)z@ Return a driver function that can advance a simple count. cSs|S)Nr)xrrrwszcount..)r)rr rrrrrr ssr csfdd}|S)z Return a decorator that can "force" a function with an arbitrary supplied generator Args: sequence (iterable) : generator to drive f with Returns: decorator cstdS)N)nextr)rrrrwrapperszforce..wrapperr)rrr#r)rrrr ys r csfdd}ttt|dS)z Return a driver function that can advance a sequence of linear values. .. code-block:: none value = m * i + b Args: m (float) : a slope for the linear driver x (float) : an offset for the linear driver cs |S)Nr)r)bmrrrszlinear..f)r)rr r)r%r$rr)r$r%rr s r cs&tfdd}ttt|dS)a  Return a driver function that can advance a repeated of values. .. code-block:: none seq = [0, 1, 2, 3] # repeat(seq) => [0, 1, 2, 3, 0, 1, 2, 3, 0, 1, ...] Args: sequence (seq) : a sequence of values for the driver to bounce cs |S)Nr)r)rrrrrszrepeat..f)r)rrr r)rrr)rrrr s r cs0ddlmfdd}ttt|dS)a Return a driver function that can advance a sequence of sine values. .. code-block:: none value = A * sin(w*i + phi) + offset Args: w (float) : a frequency for the sine driver A (float) : an amplitude for the sine driver phi (float) : a phase offset to start the sine driver with offset (float) : a global offset to add to the driver values r)sincs|S)Nr)r)rrrr&rrrrszsine..f)r)rr&rr r)rrrrrr)rrrr&rrr s r ccs d}x||V|d7}qWdS)z Yield a sequence generated by calling a given function with successively incremented integer values. Args: f (callable) : The function to advance Yields: f(i) where i increases each call rrNr)rrrrrrs  r)rrr)rr)rrr)__doc__Z __future__rrrrZloggingZ getLogger__name__log functoolsr__all__rrr r r r r rrrrr"s