Got positioner and collision-detector working
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@ -7,7 +7,7 @@
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:source-paths ["src/clj"]
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:dependencies [[org.clojure/clojure "1.5.1"]
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[domina "1.0.2-SNAPSHOT"]
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[org.clojure/clojurescript "0.0-1878"]
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[org.clojure/clojurescript "0.0-1844"]
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[org.clojure/core.async "0.1.222.0-83d0c2-alpha"]]
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:plugins [[lein-cljsbuild "0.3.3"]]
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@ -8,6 +8,9 @@
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<![endif]-->
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</head>
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<body>
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<div>FPS: <span id="fps"></span></div>
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<div>Position: <span id="pos"></span></div>
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<div style="position: absolute" id="ball">O</div>
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<!-- pointing to cljsbuild generated js file -->
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<script src="js/frpong.js"></script>
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<script type="text/javascript">frpong.core.init()</script>
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@ -1,6 +1,6 @@
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(ns frpong.core)
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(defn foo
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"I don't do a whole lot."
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[x]
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(println x "Hello, World!"))
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(defmacro go-loop [& body]
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`(cljs.core.async.macros/go
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(while true
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~@body)))
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@ -1,20 +1,61 @@
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(ns frpong.core
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(:require [cljs.core.async :as async
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:refer [<! >! chan put!]]
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[domina :as dom]
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(:require [frpong.helpers :as h]
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[cljs.core.async :as async
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:refer [<! >! chan put! close! sliding-buffer dropping-buffer timeout]]
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[domina :as dom :refer [log]]
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[domina.events :as ev])
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(:require-macros [cljs.core.async.macros :as m :refer [go]]))
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(:require-macros [cljs.core.async.macros :as m :refer [go]]
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[frpong.core :refer (go-loop)]))
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(defn positioner [tick-chan vel-chan pos-chan-in pos-chan-out]
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(go-loop
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(let [tick (<! tick-chan)
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[vel-x vel-y] (<! vel-chan)
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[x y] (<! pos-chan-in)
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pos-next [(+ x (* vel-x tick)) (+ y (* vel-y tick))]]
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(>! pos-chan-out pos-next))))
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(defn event-chan [event-type]
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(let [c (chan)]
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(ev/listen! js/document event-type
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(fn [e] (put! c e)))
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c))
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(defn collision-detector [width height tick-chan pos-chan vel-chan-in vel-chan-out]
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(go-loop
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(let [tick (<! tick-chan)
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[vel-x vel-y] (<! vel-chan-in)
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[x y] (<! pos-chan)
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[xn yn] [(+ x (* vel-x tick)) (+ y (* vel-y tick))]]
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(>! vel-chan-out
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(cond
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(< xn 0) [(- vel-x) vel-y]
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(< yn 0) [vel-x (- vel-y)]
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(> xn width) [(- vel-x) vel-y]
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(> yn height) [vel-x (- vel-y)]
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:else [vel-x vel-y])))))
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(defn ^:export init []
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(let [mm-chan (event-chan :mousemove)]
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(go
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(while true
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(let [e (<! mm-chan)]
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(.log js/console (str (:clientX e) " , " (:clientY e))))))))
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(let [frame-chan (h/frame-chan)
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[frame-chan1 frame-chan2] (h/dup-chan frame-chan)
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fps-chan (h/map-chan #(/ 1000 %) (h/diff-chan frame-chan2))
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width 100
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height 100
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init-pos [0 50]
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init-vel [0.05 0.05]
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[tick-chan-pos tick-chan-collsion] (h/dup-chan (h/diff-chan frame-chan1))
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pos-chan (chan)
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[pos-chan-pos pos-chan-render pos-chan-collision] (h/multiplex pos-chan 3)
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vel-chan (chan)
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[vel-chan-pos vel-chan-collision] (h/dup-chan vel-chan)]
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(positioner tick-chan-pos vel-chan-pos pos-chan-pos pos-chan)
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(collision-detector width height tick-chan-collsion pos-chan-collision vel-chan-collision vel-chan)
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(go (>! pos-chan init-pos))
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(go (>! vel-chan init-vel))
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(go-loop
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(let [[x y] (map int (<! pos-chan-render))]
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(dom/set-text! (dom/by-id "fps") (<! fps-chan))
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(dom/set-text! (dom/by-id "pos") [x y])
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(dom/set-style! (dom/by-id "ball") "left" (str (+ 50 x) "px"))
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(dom/set-style! (dom/by-id "ball") "top" (str (+ 50 y) "px"))))))
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180
src/cljs/frpong/helpers.cljs
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180
src/cljs/frpong/helpers.cljs
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@ -0,0 +1,180 @@
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(ns frpong.helpers
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(:require [cljs.core.async :as async
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:refer [<! >! chan put! close! sliding-buffer dropping-buffer timeout]]
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[domina :as dom :refer [log]]
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[domina.events :as ev])
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(:require-macros [cljs.core.async.macros :as m :refer [go]]
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[frpong.core :refer (go-loop)]))
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(defn now []
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(.valueOf (js/Date.)))
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(defn put-all! [cs x]
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(doseq [c cs]
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(put! c x)))
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(defn cconj [v c1]
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(let [c2 (chan)]
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(go
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(>! c2 v)
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(while true
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(>! c2 (<! c1))))
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c2))
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(defn multiplex [in cs-or-n]
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(let [cs (if (number? cs-or-n)
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(repeatedly cs-or-n chan)
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cs-or-n)]
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(go (loop []
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(let [x (<! in)]
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(if-not (nil? x)
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(do
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(put-all! cs x)
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(recur))
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:done))))
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cs))
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(defn copy-chan
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([c]
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(first (multiplex c 1)))
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([out c]
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(first (multiplex c [out]))))
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(defn dup-chan [c]
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(multiplex c 2))
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(defn map-chan
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([f source] (map-chan (chan) f source))
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([c f source]
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(go-loop
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(>! c (f (<! source))))
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c))
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(defn filter-chan
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([f source] (filter-chan (chan) f source))
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([c f source]
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(go-loop
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(let [v (<! source)]
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(when (f v)
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(>! c v))))
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c))
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(defn interval-chan
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([msecs]
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(interval-chan msecs :leading))
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([msecs type]
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(interval-chan (chan (dropping-buffer 1)) msecs type))
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([c msecs type]
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(condp = type
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:leading (go-loop
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(>! c (now))
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(<! (timeout msecs)))
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:falling (go-loop
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(<! (timeout msecs))
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(>! c (now))))
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c))
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(defn throttle
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([source control]
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(throttle (chan) source control))
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([c source control]
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(go
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(loop [state ::init last nil cs [source]]
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(let [[_ sync] cs]
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(let [[v sc] (alts! cs)]
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(condp = sc
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source (condp = state
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::init (do (>! c v)
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(recur ::throttling last
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(conj cs control)))
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::throttling (recur state v cs))
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sync (if last
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(do (>! c last)
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(recur state nil
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(conj (pop cs) control)))
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(recur ::init last (pop cs))))))))
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c))
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(defn debounce
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([source msecs]
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(debounce (chan) source msecs))
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([c source msecs]
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(go
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(loop [state ::init cs [source]]
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(let [[_ threshold] cs]
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(let [[v sc] (alts! cs)]
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(condp = sc
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source (condp = state
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::init
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(do (>! c v)
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(recur ::debouncing
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(conj cs (timeout msecs))))
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::debouncing
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(recur state
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(conj (pop cs) (timeout msecs))))
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threshold (recur ::init (pop cs)))))))
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c))
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(defn after-last
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([source msecs]
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(after-last (chan) source msecs))
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([c source msecs]
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(go
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(loop [cs [source]]
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(let [[_ toc] cs]
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(let [[v sc] (alts! cs :priority true)]
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(recur
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(condp = sc
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source (conj (if toc (pop cs) cs)
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(timeout msecs))
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toc (do (>! c (now)) (pop cs))))))))
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c))
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(defn fan-in
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([ins] (fan-in (chan) ins))
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([c ins]
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(go (while true
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(let [[x] (alts! ins)]
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(>! c x))))
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c))
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(defn distinct-chan
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([source] (distinct-chan (chan) source))
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([c source]
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(go
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(loop [last ::init]
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(let [v (<! source)]
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(when-not (= last v)
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(>! c v))
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(recur v))))
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c))
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(defn event-chan [event-type]
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(let [c (chan)]
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(ev/listen! js/document event-type #(put! c %))
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c))
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(defn frame-chan []
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(let [c (chan (sliding-buffer 1000))
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step (fn step [ts] (do (put! c ts) (.requestAnimationFrame js/window step)))]
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(.requestAnimationFrame js/window step)
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c))
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(defn counting-chan [source]
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(let [c (chan)]
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(go
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(loop [count 0]
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(<! source)
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(>! c count)
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(recur (inc count))))
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c))
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(defn diff-chan [source]
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(let [c (chan)]
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(go
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(let [start (<! source)]
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(loop [start start]
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(let [ts (<! source)]
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(>! c (- ts start))
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(recur ts)))))
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c))
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