clojure - How to prevent overlapping animations using core.async? -

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i have loop handling animations character -- set-image! takes key , displays appropriate image.

(defn main-animation-loop []   (go (while true         (set-image! :normal)         (<! (timeout 8000))         (set-image! :blink)         (<! (timeout 150)))))

every once in while character needs special actions. should able interrupt main animation:

(defn dance! []   (go (set-image! :look-left)       (<! (timeout 1000))       (set-image! :look-right)       (<! (timeout 1000))       (set-image! :wave)       (<! (timeout 2000))))

what's way pause main animation while dance routine happening?

it's common in csp style programming pass control channel event loops can, @ least tell them when stop. in case if there control channel went main-animation-loop , gave copy of dance!, dance tell main-animation-loop pause , unpause appropriatly. or stop start again (passing same control channel in case others using it).

i use pattern check messages each time around event loop:

(go (while (not= control-chan                  (second (async/alts! [control-chan (async/timeout arg)])))            (do-stuff-here))

this checks see if timeout or control channel caused interruption. 

(defn main-animation-loop [control-chan]   (go (while (not= control-chan                  (second (async/alts! [control-chan (async/timeout 150)])))         (set-image! :normal)         (<! (timeout 8000))         (set-image! :blink))))  (defn dance! [control-chan]   (go (!> control-chan :stop)       (set-image! :look-left)       (<! (timeout 1000))       (set-image! :look-right)       (<! (timeout 1000))       (set-image! :wave)       (<! (timeout 2000))       (main-animation-loop control-chan)))

by passing same channel both functions, allow them communicate each other. main-animation-loop keep looping long messages receives coming timeout channel. sees 1 of them came control channel instead of timeout, stop. allows dance! tell stop sending message control channel. in similar code have main event loop check content of message , more stop, though in case stopping enough because dance! can start event loop again.


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