afterglow.show-context
Establishes a notion of the current show using the dynamic var *show*, to save having to pass it as a parameter to dozens of functions in the Afterglow API. This needs to be bound to a value for many Afterglow functions to work.
The current show can be set locally using with-show, which is what you should do when you have multiple light shows active. However, in the extremely common case of defining and running only a single lighr show, you can also establish a default show, using set-default-show!, and omit even the with-show wrappers.
*show*
dynamic
The light show on which Afterglow functions should operate, defined as a dynamic variable so it does not need to be passed as an argument to dozens of functions. The current show can be established locally using with-show, or, if you are only creating and using a single light show, which is a very common situation, you can globally establish a default value by calling set-default-show!.
set-default-show!
(set-default-show! show)Establish the specified show as the default, so that functions that have not been wrapped inside with-show contexts will act on it. This makes sense when you are only working with one light show and do not want to have to use with-show all the time.
with-show
macro
(with-show show & body)Execute the body in the context of the specified light show, so Afterglow knows what show should be affected by its statements.