This library provides helpers for creating stages slides that provide more
flexibility than Slideshow’s build-in slide.
Executes the body
terms once for each stage name
. The terms
may include expressions and mutually recursive definitions. Within the body,
is bound to a number from 1
to the number of stages
in order. Furthermore, during execution stage
is bound to the number
of the current stage and stage-name
is bound to a symbol representing
of the current stage. By comparing stage
numeric value of each name
, or stage-name
to quoted symbols of
the form 'name
, the user may compute based on the progression of the
These keywords are bound during the execution of staged
and should not
be used otherwise.
Within a staged slide, the boolean arguments to hide, show,
and others can be used to determine in which stages to perform a transformation.
The macros pict-if, pict-cond, and pict-case, may
also be used to create images which change naturally between stages.
Returns #t if the current stage is one of name.
Returns #t if the current stage is before name.
Returns #t if the current stage is before name or is name.
Returns #t if the current stage is after name or is name.
Returns #t if the current stage is after name.
Returns #t if the current stage is before or after name.