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'make-progressor' is a Script-fu procedure that is available for all RFX-GIMP scripts to use for creating incremental counters.
The procedure requires two parameters: the initial value of the counter and the increment at each step. An optional third value can specify the period of the function.
'make-progressor' returns a function (i.e., a lambda) that evaluates to the next step in the series.
For example, the following define a simple ramp function that increments from 0.0 to 1.0 over the range of selected frames:
(if (= $start $end) (define next-step (make-progressor 0 (/ (succ (- $end $start)))))
Each time through the loop, '(next-step)' would be evaluated to return the current value of the progressor. The first time '(next-step)' is evaluated, the initial value of the progressor is returned.
Negative initial values and negative increments are permitted, and you can make create as many progressors as you would like.