cue.parameter

The same parameter, swept by the scene. Identical to parameter down to the last attribute, plus the two a cue takes: at:, the anchor it starts on, and duration:, how long it takes to run its range end to end. A choropleth moving through its years is cue.parameter:t(over: #pop.year; at: 2); the same letter dragged by hand instead is parameter:t(over: #pop.year). It is a cue rather than a play: flag because everything that follows from being one is wanted: the anchor is the ordinary one, the host's transport finds the sweep by walking anchors as it finds every other piece of choreography, and the play, pause and replay the reader gets are the step's. duration: is the time to cross the whole range, so a default: part way along it finishes in proportionally less. The reader still gets the slider, and dragging it displaces the sweep rather than stopping it: playing on carries the letter from wherever they let go, at the rate the author set. What moves is the sweep's own elapsed time and never the scene clock — moving that would drag every other cue in the scene along with it — and their displacement is handed back when they leave the step or replay it.