.gitignore

@@ -7,6 +7,5 @@ pom.xml.asc
 *.class
 /.lein-*
 /.nrepl-port
-/resources/public/js
 /out
 /repl

README.md

@@ -1,86 +0,0 @@
-# Gravity Pong
-
-Gravity Pong is the famous [Pong][pong] game with a twist, written in [ClojureScript][cljs] using the 
-[core.async][coreasync] library. It can be played [here][demo] (only works on Google Chrome for now).
-
-Along with the usual Pong ball and the paddles on both sides of the screen, there is also a mass at 
-the center of the screen which exerts a gravitational force on the ball causing it to change its path
-from a usual straight line to a curve. And the user can control the gravitational force using the 
-keyboard to shape the ball's path as they want.
-
-## Details for Programmers
-It is written in the [Flow-based Programming][fbprog] paradigm where calculations of ball's position, 
-velocity etc are done by separate modular components running in their own threads of computation 
-(in this case, core.async go processes). These components are connected using signals (implemented 
-using core.async channels) to form a network - like an electronic circuit - to build the complete game.
-The signals have values which change over time. [`window.requestAnimationFrame`][raf] is used as a 
-clock to generate the time ticks to run the game.
-
-The very [loose coupling][coupling] (data coupling) caused by the modular design allows one to add 
-new components in the network without changing other parts of it. In fact, this was first developed 
-as a usual Pong game and gravitation was added only as an afterthought, with very minimal changes
-to the existing code.
-
-Here is how the network of components interconnected with signals looks like:
-
-<pre>
-                                      +-d-----------+--------------------------+
-                                      v             |                          |
- keyboard +-e-> sampler +---k---> paddle-postnr +-d-+   +-> gravitation +--+   |
-                  ^                                 |   p                  a   |
-                  t                                 |   |                  |   |
-                  |                                 |   |                  |   |
-                  +-------+          +-p----------+-|---+                  |   d
-                          |          |  +-a-------|-|------+---------------+   |
-                          |          v  v         | |      |                   v
-  browser +-b--> ticker +-+--t--> ball-postnr +-p-+-|------|------------p-> renderer
-                    ^     |             ^         | |      |                  ^  ^
-                    |     |       +-----|---------+ |      |                  |  |
-                    s     |       |     l     +--d--+      |                  s  t
-                    |     |       |   +-+-----|-------+    |                  |  |
-                    |     |       p   l   +-a-|-------|----+                  |  |
-                    |     |       v   v   v   v  +-l--+                       |  |
-                    |     +---t-> collision-detr                              |  |
-                    |     |             ^        +-s--+-----------------------+  |
-                    |     |             s             |                          |
-                    +-----|-------------+-------------+                          |
-                          |                                                      |
-                          +------------------------------------------------------+
-</pre>
-
-Signals     
-
- - *b*: ticks from browser
- - *t*: game ticks        
- - *e*: keyboard events   
- - *k*: keydowns          
- - *p*: ball position     
- - *l*: ball velocity     
- - *a*: ball acceleration 
- - *d*: paddle positions  
- - *s*: game state        
-
-Components
-
- - *keyboard*: keyboard for user input
- - *browser*: browser as the primary source of ticks
- - *ticker*: generates game ticks from browser ticks
- - *sampler*: samples input signal based on a sampling signal
- - *paddle-postnr*: paddle positioner, calculates the position of paddles
- - *ball-postnr*: ball positioner, calculates the position of the ball
- - *collision-detr*: collision detector, detects collision of the ball with the paddles and the 
-                       walls, also calculates the velocity of the ball
- - *gravitation*: calculates the acceleration of the ball due to gravitation
- - *renderer*: renders the game on screen
-
-This project has been written as an experiment to play with the core.async library and can serve as
-a medium sized example project for the same. The main source can be found [here][src].
-
-[pong]: https://en.wikipedia.org/wiki/Pong
-[cljs]: https://github.com/clojure/clojurescript
-[coreasync]: https://github.com/clojure/core.async
-[demo]: http://abhinavsarkar.net/frpong
-[fbprog]: https://en.wikipedia.org/wiki/Flow-based_programming
-[coupling]: https://en.wikipedia.org/wiki/Coupling_(computer_programming)
-[src]: https://github.com/abhin4v/frpong/blob/master/src/cljs/frpong/core.cljs
-[raf]: https://developer.mozilla.org/en-US/docs/Web/API/window.requestAnimationFrame

js/frpong.js

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+ The Closure Authors under the MIT license. All other code is Copyright
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+*/
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+v.Md=1;v.Ba=function(){return 2==this.Md};v.Qa=n;v.zb=n;function vn(a){try{return!!a.Qa&&!Boolean(a.Qa.closed)}catch(b){return r}}function jo(a){a.Ca&&(a.Ca.cancel(),a.Ca=n);a.rc.length=0;a=a.Cc;Ka(a.O,$i);a.O.length=0}v.Aa=function(a){this.qd=a||fa;this.Ca?Tm(this.Ca,this.qe,n,h):this.qe()};
+v.qe=function(){Y.info("continueConnection_()");this.Ca=n;this.v[Z.Ua]&&(this.zb=y(this.v[Z.Ua])?this.Ka.Ob.getElementById(this.v[Z.Ua]):this.v[Z.Ua]);if(this.zb){var a=this.zb.contentWindow;a||(a=window.frames[this.v[Z.Ua]]);this.Qa=a}this.Qa||(window==window.top&&e(Error("CrossPageChannel: Can't connect, peer window-object not set.")),this.Qa=window.parent);if(!this.ba){if(!this.v[Z.Jb]){var a=this.v,b=Z.Jb,c;if(ja(document.postMessage)||ja(window.postMessage)||ri&&window.postMessage)c=1;else if(si)c=
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+v.send=function(a,b){this.Ba()?vn(this)?(ka(b)&&(b=Am(b)),this.ba.send(ko(a),b)):(Y.log(nm,"Peer has disappeared.",h),this.close()):Y.log(nm,"Can't send. Channel not connected.",h)};
+v.Ia=function(a,b,c){if(this.Ca)this.rc.push(qa(this.Ia,this,a,b,c));else{var d=this.v[Z.Nc];if(/^[\s\xa0]*$/.test(c==n?"":String(c))||/^[\s\xa0]*$/.test(d==n?"":String(d))||c==this.v[Z.Nc])if(this.ia)Y.log(om,"CrossPageChannel::deliver_(): Disposed.",h);else if(!a||"tp"==a)this.ba.Nd(b);else if(this.Ba()){if(a=a.replace(/%[0-9a-f]{2}/gi,decodeURIComponent),a=io.test(a)?a.substring(1):a,c=this.Jd[a],c||(this.we?c={xa:ra(this.we,a),Pe:ka(b)}:(this.yc.log(om,'Unknown service name "'+a+'"',h),c=n)),
+c){var f;a:{if((d=c.Pe)&&y(b))try{f=zm(b);break a}catch(g){this.yc.log(om,"Expected JSON payload for "+a+', was "'+b+'"',h);f=n;break a}else if(!d&&!y(b)){f=Am(b);break a}f=b}f!=n&&c.xa(f)}}else Y.info("CrossPageChannel::deliver_(): Not connected.");else Y.log(om,'Message received from unapproved origin "'+c+'" - rejected.',h)}};function ko(a){ho.test(a)&&(a="%"+a);return a.replace(/[%:|]/g,encodeURIComponent)}function yn(a){var b=a.v[Z.Oc];return b?b:window.parent==a.Qa?1:0}
+v.H=function(){this.close();this.zb=this.Qa=n;delete Km[this.name];Li(this.Cc);delete this.Cc;fo.na.H.call(this)};function go(){for(var a in Km)Li(Km[a])};Af(sg,nf.b(function(a){var b=R.c(a,0,n),a=R.c(a,1,n);return S([me.a(b.toLowerCase()),a])},ih.g(N([bi.a({hg:"complete",ng:"success",ig:"error",gg:"abort",lg:"ready",mg:"readystatechange",TIMEOUT:"timeout",jg:"incrementaldata",kg:"progress"})],0))));var lo,mo=n;function no(a){if(a?a.je:a)return a.je(a);var b;var c=lo[w(a==n?n:a)];c?b=c:(c=lo._)?b=c:e(B("IConnection.connect",a));return b.call(n,a)}
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+v.me=function(a,b,c,d){Y.info("createPeerIframe()");var f=a.v[Z.Ua];f||(f=a.v[Z.Ua]="xpcpeer"+Lm(4));var g=fj(d).createElement("IFRAME");g.id=g.name=f;c?c(g):g.style.width=g.style.height="100%";jo(a);a.Ca=new Nm(h,a);var i,c=a.v[Z.gc];y(c)&&(c=a.v[Z.gc]=new Xm(c));var k={};k[Z.Pd]=a.name;k[Z.Jb]=a.v[Z.Jb];k[Z.Mc]=a.v[Z.Mc];a.v[Z.Lc]&&(k[Z.fc]=a.v[Z.Lc]);a.v[Z.eb]&&(k[Z.fb]=a.v[Z.eb]);a.v[Z.fb]&&(k[Z.eb]=a.v[Z.fb]);var l=a.v[Z.Oc];l&&(k[Z.Oc]=1==l?0:1);l=c;k=Am(k);Zm(l);l.Ra.set("xpc",k);i=c;Kn(a.Cc,
+g,"load",a.Ca.xa,r,a.Ca);si||ti?window.setTimeout(qa(function(){d.appendChild(g);g.src=i.toString();Y.info("peer iframe created ("+f+")")},a),1):(g.src=i.toString(),d.appendChild(g),Y.info("peer iframe created ("+f+")"));return a.Aa(b)};v.ne=function(a,b,c){return a.send(pe(b),c)};v.oe=function(a,b,c){return zo.n(a,b,c,r)};v.pe=function(a,b,c,d){b=pe(b);a.Jd[b]={xa:c,Pe:!!d}};var Do,Eo=n;function Fo(){var a=(new Xm(window.location.href)).Ra.get("xpc");return z(a)?new fo(zm(a)):n}
+function Go(a){return new fo(Od.c(function(a,c){var d=R.c(c,0,n),f=R.c(c,1,n),d=bd.b(yo,d);z(d)&&(a[d]=f);return a},{},a))}Eo=function(a){switch(arguments.length){case 0:return Fo.call(this);case 1:return Go.call(this,a)}e(Error("Invalid arity: "+arguments.length))};Eo.h=Fo;Eo.a=Go;Do=Eo;var Ho=Mh.a(n);function Io(a){var b=function(){try{return Za(["\ufdd0:status","\ufdd0:success","\ufdd0:value",""+E(eval(a))],m)}catch(b){if(b instanceof Error)return Za(["\ufdd0:status","\ufdd0:exception","\ufdd0:value",Kh.g(N([b],0)),"\ufdd0:stacktrace",z(b.hasOwnProperty("stack"))?b.stack:"No stacktrace available."],m);e(b)}}();return Kh.g(N([b],0))}Mh.a(0);var Jo=Do.a(Za(["\ufdd0:peer_uri","http://localhost:9000/repl"],m));Sh.b(Ho,mf(Jo));zo.c(Jo,"\ufdd0:evaluate-javascript",function(a){return ro.c(Jo,"\ufdd0:send-result",Io(a))});lo.c(Jo,mf(n),function(a){return a.style.display="none"});

project.clj

@@ -1,19 +0,0 @@
-(defproject frpong "0.1.0-SNAPSHOT"
-  :description "FRP Pong in ClojureScript using core.async"
-  :url "http://example.com/FIXME"
-  :license {:name "Eclipse Public License"
-            :url "http://www.eclipse.org/legal/epl-v10.html"}
-
-  :source-paths ["src/clj"]
-  :dependencies [[org.clojure/clojure "1.5.1"]
-                 [domina "1.0.2-SNAPSHOT"]
-                 [org.clojure/clojurescript "0.0-1844"]
-                 [org.clojure/core.async "0.1.222.0-83d0c2-alpha"]]
-
-  :plugins [[lein-cljsbuild "0.3.3"]]
-
-  :cljsbuild {:builds
-              [{:source-paths ["src/cljs"]
-                :compiler {:output-to "resources/public/js/frpong.js"
-                           :optimizations :whitespace
-                           :pretty-print true}}]})

src/clj/frpong/core.clj

@@ -1,12 +0,0 @@
-(ns frpong.core)
-
-(defmacro go [& body] `(cljs.core.async.macros/go ~@body))
-
-(defmacro go-loop [& body]
-  `(cljs.core.async.macros/go
-     (while true
-       ~@body)))
-
-(defmacro rd [& body] `(cljs.core.async/<! ~@body))
-
-(defmacro wt [& body] `(cljs.core.async/>! ~@body))

src/cljs/frpong/connect.cljs

@@ -1,4 +0,0 @@
-(ns modern-cljs.connect
-  (:require [clojure.browser.repl :as repl]))
-
-(repl/connect "http://localhost:9000/repl")

src/cljs/frpong/core.cljs

@@ -1,355 +0,0 @@
-(ns frpong.core
-  (:require [frpong.signals :refer (signal keyboard ticks dom-events mult tap)]
-            [domina :as dom :refer [log]]
-            [domina.events :as ev])
-  (:require-macros [frpong.core :refer (go go-loop rd wt)]))
-
-;; * `signal` creates a new signal
-;; * `keyboard`, `ticks` and `dom-events` create signals for keydown events, browser animation ticks and
-;; JS DOM events repectively
-;; * `mult` creates a mult(iple) of a signal which can then be tapped using `tap` to create a copy of the
-;; original signal
-;; * `rd` reads the current value of a signal
-;; * `wt` sets the current value of a signal to the provided value
-;; * `go` and `go-loop` start and run a component
-
-;;                                       Signal Diagram
-;;
-;;                                                +-d-----------+--------------------------+
-;;                                                v             |                          |
-;;           keyboard +-e-> sampler +---k---> paddle-postnr +-d-+   +-> gravitation +--+   |
-;;                            ^                                 |   p                  a   |
-;;                            t                                 |   |                  |   |
-;;                            |                                 |   |                  |   |
-;;                            +-------+          +-p----------+-|---+                  |   d
-;;                                    |          |  +-a-------|-|------+---------------+   |
-;;                                    |          v  v         | |      |                   v
-;;            browser +-b--> ticker +-+--t--> ball-postnr +-p-+-|------|------------p-> renderer
-;;                              ^     |             ^         | |      |                  ^  ^
-;;  Signals                     |     |       +-----|---------+ |      |                  |  |
-;;  -------                     s     |       |     l     +--d--+      |                  s  t
-;;  b: browser ticks            |     |       |   +-+-----|-------+    |                  |  |
-;;  t: game ticks               |     |       p   l   +-a-|-------|----+                  |  |
-;;  e: keyboard events          |     |       v   v   v   v  +-l--+                       |  |
-;;  k: keydowns (at rate of t)  |     +---t-> collision-detr                              |  |
-;;  p: ball position            |     |             ^        +-s--+-----------------------+  |
-;;  l: ball velocity            |     |             s             |                          |
-;;  a: ball acceleration        +-----|-------------+-------------+                          |
-;;  d: paddle positions               |                                                      |
-;;  s: game state                     +------------------------------------------------------+
-;;
-;;  All signals except the signal e are at the rate of the signal b. The signal e is at the rate
-;;  at which the keyboard issues events. The signal b is at the rate at which the browser supplies
-;;  animation frames.
-
-(defn abs [x] (.abs js/Math x))
-(defn sqrt [x] (.sqrt js/Math x))
-(defn sq [x] (* x x))
-
-(def PI 3.141592653589793)
-
-(defn deg->rad [deg] (* (/ deg 180) PI))
-
-(defn cos [x] (.cos js/Math x))
-(defn sin [x] (.sin js/Math x))
-
-;; Global settings
-(def width            (- (.-scrollWidth (.-body js/document)) 20))
-(def height           (- (.-scrollHeight (.-body js/document)) 130))
-(def center           [(/ width 2 ) (/ height 2)])
-(def padding          5)
-(def paddle-size      100)
-
-(def ball-radius      8)
-(def ball-speed       0.6)
-(def init-vel-deg-lim [35 55])
-(def perturb-factor   0.05)
-
-(def init-mass-radius 0)
-
-(def paddle-width     10)
-(def paddle-step      8)
-(def max-paddle-y     (- height paddle-size))
-(def ef-paddle-width  (+ paddle-width padding))
-(def init-paddle-pos  (/ (- height paddle-size) 2))
-
-(def gravity          (atom 0.005))
-(def gravity-step     0.005)
-
-(defn mass-radius []
-  (+ init-mass-radius (* (deref gravity) 1000)))
-
-(defn setup-gravity-controls
-  "Sets up keyboard controls for changing gravity."
-  []
-  (let [keydowns   (first (dom-events :keydown))
-        actions    { 37 #(- % gravity-step) 39 #(+ % gravity-step) }
-        mass-el    (dom/by-id "mass")]
-    (go-loop
-      (let [k (:keyCode (rd keydowns))]
-        (when (contains? actions k)
-          (do (swap! gravity #(max 0 (min 0.1 ((actions k) %))))
-            (dom/set-attr! mass-el "r" (mass-radius))))))))
-
-(defn layout-game
-  "Lays out the game screen."
-  []
-  (doto (dom/by-id "canvas")
-      (dom/set-style! "width" (str width "px"))
-      (dom/set-style! "height" (str height "px")))
-  (doto (dom/by-id "ball")
-    (dom/set-attr! "r" ball-radius)
-    (dom/set-attr! "cx" (first center))
-    (dom/set-attr! "cy" (second center)))
-  (doto (dom/by-id "mass")
-    (dom/set-attr! "r" (mass-radius))
-    (dom/set-attr! "cx" (first center))
-    (dom/set-attr! "cy" (second center)))
-  (doto (dom/by-id "score")
-    (dom/set-attr! "x" (first center))
-    (dom/set-attr! "y" (- height 50)))
-  (doseq [id ["lpaddle" "rpaddle"]]
-    (doto (dom/by-id id)
-      (dom/set-attr! "width" paddle-width)
-      (dom/set-attr! "height" paddle-size)
-      (dom/set-attr! "y" (/ (- height paddle-size) 2))))
-  (dom/set-attr! (dom/by-id "lpaddle") "x" 0)
-  (dom/set-attr! (dom/by-id "rpaddle") "x" (- width paddle-width)))
-
-(defn initial-velocity
-  "Calculates a random initial ball velocity, randomly in any four quadrants, between
-   the limits of degrees specified by init-vel-deg-lim."
-  []
-  (let [[l h] init-vel-deg-lim
-        sgn   #(if (< % 0.5) -1 1)
-        deg   (+ l (* (- h l) (rand)))
-        rad   (deg->rad deg)]
-    (map #(* ball-speed %)
-      [(* (sgn (rand)) (sin rad)) (* (sgn (rand)) (cos rad))])))
-
-(defn start-game
-  "Sets up the game by creating the signals and setting up the components and starts the game."
-  []
-  (let [br-ticks   (ticks)               ;; ticks signal from the browser
-        pos        (signal)              ;; ball position signal
-        vel        (signal)              ;; ball velocity signal
-        acc        (signal)              ;; ball acceleration signal
-        pd-pos     (signal)              ;; paddles position signal
-        game-state (signal)              ;; game state signal, the state of the game and the current score
-        init-vel   (initial-velocity)]
-    (setup-components br-ticks game-state pos vel acc pd-pos)
-
-    ;; start the game by setting the initial values of the signals
-    (go
-      (wt pos center)
-      (wt vel init-vel)
-      (wt pd-pos [init-paddle-pos init-paddle-pos])
-      (wt game-state [:moving 0]))))
-
-(defn start-on-space []
-  (ev/listen-once! :keypress #(if (= (:keyCode %) 32) (start-game) (start-on-space))))
-
-(defn setup-components
-  "Creates mult(iple)s of the signals and sets up the components by connecting them using
-   the signals tapped from the mults.
-   The signals and their stop functions are taken as parameters."
-  [[br-ticks stop-ticks] game-state pos vel acc pd-pos]
-  (let [ticks                    (signal)           ;; game ticks signal
-        ticks-m                  (mult ticks)       ;; mult(iple)s for all signals
-        pos-m                    (mult pos)
-        vel-m                    (mult vel)
-        acc-m                    (mult acc)
-        pd-pos-m                 (mult pd-pos)
-        game-state-m             (mult game-state)
-
-        ;; keyboard signal for w, s, up and down keys
-        [keyboard stop-keyboard] (keyboard (tap ticks-m) {83 :s 87 :w 38 :up 40 :down})
-
-        ;; calling this will stop the ticks and the keyboard signals and hence stop the game
-        stop-game                 #(do (stop-ticks) (stop-keyboard))]
-    ;; set up the components by tapping into mults
-    (ticker br-ticks stop-game (tap game-state-m) ticks)
-
-    (gravitation (tap pos-m) acc)
-    (ball-positioner (tap ticks-m) (tap pos-m) (tap vel-m) (tap acc-m) pos)
-    (paddle-positioner keyboard (tap pd-pos-m) pd-pos)
-
-    (collision-detector (tap ticks-m) (tap pos-m) (tap vel-m) (tap acc-m)
-      (tap pd-pos-m) (tap game-state-m) game-state vel)
-
-    (renderer (tap ticks-m) (tap game-state-m) (tap pos-m) (tap pd-pos-m))))
-
-(defn ticker
-  "Ticker component.
-   Reads ticks generated by the browser from the `br-ticks` signal and outputs them to the
-   `game-ticks` signal as long as the `game-state` signal is not :gameover.
-   Once the `game-state` signal is :gameover, stops the game by calling the `stop-game` function.
-   Each tick is the number of milliseconds since the last tick was generated."
-  [br-ticks stop-game game-state game-ticks]
-  (go (loop []
-        (let [[state _] (rd game-state)]
-          (do (wt game-ticks (rd br-ticks))
-            (if-not (= :gameover state)
-              (recur)
-              (stop-game)))))))
-
-(defn gravity-acc
-  "Calculates acceleration due to gravitation for the ball caused by the mass placed at the
-   center of the board."
-  [[x y]]
-  (let [grav     (deref gravity)
-        [cx cy]  center
-        x-dist   (- cx x)
-        y-dist   (- cy y)
-        distance (sqrt (+ (sq x-dist) (sq y-dist)))
-        bearing  [(/ x-dist distance) (/ y-dist distance)]]
-    (if-not (= distance 0)
-      (map #(* grav % (/ 1 distance)) bearing)
-      [0 0])))
-
-(defn gravitation
-  "Gravitation component.
-   Calculates acceleration due to gravitation using the pos from the `pos-in` signal and outputs
-   it to the `acc` signal."
-  [pos-in acc]
-  (go-loop
-    (wt acc (gravity-acc (rd pos-in)))))
-
-(defn next-pos [[x y] [vel-x vel-y] [acc-x acc-y] tick]
-  [(+ x (* vel-x tick) (* acc-x (sq tick))) (+ y (* vel-y tick) (* acc-y (sq tick)))])
-
-(defn ball-positioner
-  "Ball Positioner component.
-   Calculates the next ball position using the current ball position, velocity and acceleration
-   (from the `pos-in`, `vel` and `acc` signals respectively) and the current tick (from the
-   `ticks` signal) and outputs it to the `pos-out` signal."
-  [ticks pos-in vel acc pos-out]
-  (go-loop
-    (let [tick     (rd ticks)
-          pos-next (next-pos (rd pos-in) (rd vel) (rd acc) tick)]
-      (wt pos-out pos-next))))
-
-(defn paddle-positioner
-  "Paddle Positioner component.
-   Captures the keys signal for the provides keycodes and calculates the next paddle
-   positions using the current paddle positions (from the `pos-in` signal) and keys signal
-   and outputs it to the `pos-out` signal."
-  [keys pos-in pos-out]
-  (go-loop
-    (let [[lpos rpos] (rd pos-in)
-          ks          (rd keys)
-          move        (fn [pos up down]
-                        (cond
-                          (contains? ks up)   (max (- pos paddle-step) 0)
-                          (contains? ks down) (min (+ pos paddle-step) max-paddle-y)
-                          :else                pos))]
-      (wt pos-out [(move lpos :w :s) (move rpos :up :down)]))))
-
-(defn in-y-range? [y paddle-y]
-    (and (> y (- paddle-y padding)) (< y (+ paddle-y paddle-size padding))))
-
-(defn detect-x-collision [x y lpaddle-y rpaddle-y]
-  (cond
-    (< x ef-paddle-width)
-      (if (in-y-range? y lpaddle-y) :collision-left  :gameover)
-    (> x (- width ef-paddle-width))
-      (if (in-y-range? y rpaddle-y) :collision-right :gameover)
-    :else :moving))
-
-(defn detect-y-collision [y]
-  (cond
-    (< y padding)            :collision-left
-    (> y (- height padding)) :collision-right
-    :else                    :moving))
-
-(defn collision? [state]
-  (or (= state :collision-left) (= state :collision-right)))
-
-(defn adjust-vel [state vel]
-  (condp = state
-    :collision-left  (abs vel)
-    :collision-right (- (abs vel))
-    :moving          vel
-    :gameover        0))
-
-(defn perturb [v] (* v (+ 1 (* (rand) perturb-factor))))
-
-(defn collision-detector [ticks pos vel-in acc pd-pos game-state-in game-state vel-out]
-  "Collision Detector component.
-   Detects the collision of the ball with the walls and the paddles and accordingly calculates
-   and outputs the next ball velocity and next game state to the `vel-out` and `game-state`
-   signals respectively.
-   Reads the current tick, ball position, ball velocity, ball acceleration, left and right paddle
-   positions and game state from the `ticks`, `pos`, `vel-in`, `acc`, `pd-pos` and `game-state`
-   signals respectively."
-
-  (go-loop
-    (let [;; read all current values
-          tick                  (rd ticks)
-          [vel-x vel-y]         (rd vel-in)
-          [x y]                 (rd pos)
-          [gx gy]               (rd acc)
-          [lpaddle-y rpaddle-y] (rd pd-pos)
-          [_ score]             (rd game-state-in)
-
-          ;; calculate next position and detect collision
-          [xn yn]               (next-pos [x y] [vel-x vel-y] [gx gy] tick)
-          x-state               (detect-x-collision xn yn lpaddle-y rpaddle-y)
-          y-state               (detect-y-collision yn)
-          x-collision           (collision? x-state)
-          y-collision           (collision? y-state)
-
-          ;; calculate next velocity and game state
-          vel-xn                (min ball-speed (+ (adjust-vel x-state vel-x) (* gx tick)))
-          vel-yn                (min ball-speed (+ (adjust-vel y-state vel-y) (* gy tick)))
-          state-n               (cond
-                                  (= x-state :gameover)        :gameover
-                                  (or x-collision y-collision) :collision
-                                  :else                        :moving)
-          score-n               (if x-collision (inc score) score)
-
-          ;; add a small random perturbation to the ball velocity on collision with paddles
-          [vel-xn vel-yn]       (if x-collision
-                                  (map perturb [vel-xn vel-yn])
-                                  [vel-xn vel-yn])]
-      (wt vel-out [vel-xn vel-yn])
-      (wt game-state [state-n score-n]))))
-
-(defn renderer
-  "Renderer component.
-   Renders the ball and paddle positions on the browser. Also shows the game state and stats.
-   Reads the current values from the signals supplied as parameters."
-  [ticks game-state pos pd-pos]
-  (let [ball-el    (dom/by-id "ball")
-        score-el   (dom/by-id "score")
-        lpaddle-el (dom/by-id "lpaddle")
-        rpaddle-el (dom/by-id "rpaddle")
-        fps-el     (dom/by-id "fps")
-        msg-el     (dom/by-id "msg")]
-    (dom/set-style! ball-el "fill" "orange")
-    (dom/set-text! msg-el "")
-    (go (loop [fps-p nil score-p nil]
-          (let [fps                   (int (/ 1000 (rd ticks)))
-                [x y]                 (rd pos)
-                [lpaddle-y rpaddle-y] (rd pd-pos)
-                [state score]         (rd game-state)]
-            (doto ball-el
-              (dom/set-attr! "cx" x)
-              (dom/set-attr! "cy" y))
-            (dom/set-attr! lpaddle-el "y" lpaddle-y)
-            (dom/set-attr! rpaddle-el "y" rpaddle-y)
-            (when-not (= fps fps-p)
-              (dom/set-text! fps-el fps))
-            (when-not (= score score-p)
-              (dom/set-text! score-el score))
-            (when (= state :gameover)
-              (do (dom/set-style! ball-el "fill" "red")
-                (dom/set-html! msg-el "<span class='imp'>GAME OVER</span><br>press &lt;space&gt; to restart")
-                (start-on-space)))
-            (recur fps score))))))
-
-;; Everything is ready now. Layout the game and start it on pressing <space>!
-(defn ^:export frpong []
-  (setup-gravity-controls)
-  (layout-game)
-  (start-on-space))

src/cljs/frpong/signals.cljs

@@ -1,272 +0,0 @@
-(ns frpong.signals
-  (:require [cljs.core.async :as async
-             :refer [<! >! chan put! close! sliding-buffer dropping-buffer timeout]]
-            [domina :as dom :refer [log]]
-            [domina.events :as ev])
-  (:require-macros [cljs.core.async.macros :as m :refer [go]]
-                   [frpong.core :refer (go-loop)]))
-
-(defn now []
-  (.valueOf (js/Date.)))
-
-(defn signal [] (chan 1))
-
-(defn put-all! [cs x]
-  (doseq [c cs]
-    (put! c x)))
-
-(defn probe [ch probe-name]
-  (let [c (chan)]
-    (go (loop []
-          (if-let [v (<! ch)]
-            (do (log (str (now) " " probe-name ": " v))
-              (>! c v)
-              (recur))
-            (close! c))))
-    c))
-
-(defn smap [f source]
-  (let [c (chan)]
-    (go (loop []
-          (if-let [v (<! source)]
-            (do (>! c (f v)) (recur))
-            (close! c))))
-    c))
-
-(defn sfilter [f source]
-  (let [c (chan)]
-    (go (loop []
-          (if-let [v (<! source)]
-            (do (when (f v) (>! c v)) (recur))
-            (close! c))))
-    c))
-
-(defn interval-signal
-  ([msecs]
-    (interval-signal msecs :leading))
-  ([msecs type]
-    (let [c (chan (dropping-buffer 1))]
-      (condp = type
-        :leading (go-loop
-                   (>! c (now))
-                   (<! (timeout msecs)))
-        :falling (go-loop
-                   (<! (timeout msecs))
-                   (>! c (now))))
-      c)))
-
-(defn throttle [source control]
-  (let [c (chan)]
-    (go
-      (loop [state ::init last nil]
-        (let [[v sc] (alts! [source control])]
-          (condp = sc
-            source (condp = state
-                     ::init (do (>! c v) (recur ::throttling last))
-                     ::throttling (recur state v))
-            control (if last 
-                      (do (>! c last) (recur state nil))
-                     (recur ::init last))))))
-    c))
-
-(defn sustain [source control]
-  (let [c (chan)]
-    (go
-      (loop [last nil]
-        (let [[v ch] (alts! [source control] :priority true)]
-          (if (nil? v)
-            (close! c)
-            (condp = ch
-              source (do (>! c v) (recur v))
-              control (do (when last (>! c last)) (recur last)))))))
-    c))
-
-(defn debounce [source msecs]
-  (let [c (chan)]
-    (go
-      (loop [state ::init cs [source]]
-        (let [[_ threshold] cs]
-          (let [[v sc] (alts! cs)]
-            (condp = sc
-              source (condp = state
-                       ::init
-                         (do (>! c v)
-                           (recur ::debouncing
-                             (conj cs (timeout msecs))))
-                       ::debouncing
-                         (recur state
-                           (conj (pop cs) (timeout msecs))))
-              threshold (recur ::init (pop cs)))))))
-    c))
-
-(defn after-last [source msecs]
-  (let [c (chan)]
-    (go
-      (loop [cs [source]]
-        (let [[_ toc] cs]
-          (let [[v sc] (alts! cs :priority true)]
-            (recur
-              (condp = sc
-                source (conj (if toc (pop cs) cs)
-                         (timeout msecs))
-                toc (do (>! c (now)) (pop cs))))))))
-    c))
-
-(defn fan-in [ins]
-  (let [c (chan)]
-    (go-loop
-      (let [[x] (alts! ins)]
-        (>! c x)))
-    c))
-
-(defn scounter [source]
-  (let [c (chan)]
-    (go
-      (loop [count 0]
-        (if-let [v (<! source)]
-          (do (>! c count) (recur (inc count)))
-          (close! c))))
-    c))
-
-(defn sdiff [source]
-  (let [c (chan)]
-    (go
-      (let [start (<! source)]
-        (loop [start start]
-          (if-let [v (<! source)]
-            (do (>! c (- v start)) (recur v))
-            (close! c)))))
-    c))
-
-(defn sampler [source n]
-  (let [c (chan)]
-    (go
-      (loop [count 0]
-        (if-let [v (<! source)]
-          (do (when (= count 0) (>! c v))
-            (recur (rem (inc count) n)))
-          (close! c))))
-    c))
-
-(defn dom-events
-  ([event-type]
-    (let [c      (chan)
-          [lkey] (ev/listen! event-type #(put! c %))]
-      [c #(do (ev/unlisten-by-key! lkey) (close! c))]))
-  ([node event-type]
-    (let [c (chan)
-          [lkey] (ev/listen! node event-type #(put! c %))]
-      [c #(do (ev/unlisten-by-key! lkey) (close! c))])))
-
-(defn keyboard [sampler keycodes]
-  (let [[keydowns kd-stop-fn] (dom-events :keydown) ;; keydowns signal
-        [keyups   ku-stop-fn] (dom-events :keyup)   ;; keyups signal
-        c                     (chan)
-        ops                   { keydowns conj
-                                keyups   disj }]
-    (go (loop [keys #{}]
-      (let [[v ch] (alts! [keydowns keyups sampler] :priority true)]
-        (if-not (nil? v)
-          (if (or (= ch keydowns) (= ch keyups))
-            (let [k (:keyCode v)]
-              (if (contains? keycodes k)
-                (recur ((ops ch) keys (keycodes k)))
-                (recur keys)))
-            (do (>! c keys) (recur keys)))
-          (close! c)))))
-    [c #(do (kd-stop-fn) (ku-stop-fn))]))
-
-(defn frames []
-  (let [fc (chan (sliding-buffer 1000))
-        rc (chan (sliding-buffer 10))
-        step (fn step [ts] 
-               (let [req-id (.requestAnimationFrame js/window step)]
-                 (put! fc ts)
-                 (put! rc req-id)))
-        stop-fn (fn []
-                  (go (loop []
-                        (if-let [id (<! rc)]
-                          (do (.cancelAnimationFrame js/window id) (recur)))))
-                  (close! fc)
-                  (close! rc))]
-    (.requestAnimationFrame js/window step)
-    [fc stop-fn]))
-
-(defn ticks []
-  (let [c                (chan)
-        [frames stop-fn] (frames)
-        frames-diff      (sdiff frames)]
-    (go
-      (loop [prev (<! frames-diff)]
-        (if-let [t (<! frames-diff)]
-          (do (when (< t (* 10 prev)) (>! c t))
-            (recur t))
-          (close! c))))
-    [c stop-fn]))
-
-(defprotocol Mux
-  (muxch* [_]))
-
-(defprotocol Mult
-  (tap* [m ch close?])
-  (untap* [m ch])
-  (untap-all* [m]))
-
-(defn mult
-  "Creates and returns a mult(iple) of the supplied channel. Channels
-  containing copies of the channel can be created with 'tap', and
-  detached with 'untap'.
-
-  Each item is distributed to all taps in parallel and synchronously,
-  i.e. each tap must accept before the next item is distributed. Use
-  buffering/windowing to prevent slow taps from holding up the mult.
-
-  Items received when there are no taps get dropped.
-
-  If a tap put throws an exception, it will be removed from the mult."
-  [ch]
-  (let [cs (atom {}) ;;ch->close?
-        m (reify
-            Mux
-            (muxch* [_] ch)
-
-            Mult
-            (tap* [_ ch close?] (swap! cs assoc ch close?) nil)
-            (untap* [_ ch] (swap! cs dissoc ch) nil)
-            (untap-all* [_] (reset! cs {}) nil))
-        dchan (chan 1)
-        dctr (atom nil)
-        done #(when (zero? (swap! dctr dec))
-                (put! dchan true))]
-    (go (loop []
-      (let [val (<! ch)]
-        (if (nil? val)
-          (doseq [[c close?] @cs]
-            (when close? (close! c)))
-          (let [chs (keys @cs)]
-            (reset! dctr (count chs))
-            (doseq [c chs]
-              (put! c val done))
-            ;;wait for all
-            (when (seq chs)
-              (<! dchan))
-            (recur))))))
-    m))
-
-(defn tap
-  "Copies the mult source onto the supplied channel.
-
-  By default the channel will be closed when the source closes,
-  but can be determined by the close? parameter."
-  ([mult] (tap mult (chan)))
-  ([mult ch] (tap mult ch true))
-  ([mult ch close?] (tap* mult ch close?) ch))
-
-(defn untap
-  "Disconnects a target channel from a mult"
-  [mult ch]
-  (untap* mult ch))
-
-(defn untap-all
-  "Disconnects all target channels from a mult"
-  [mult] (untap-all* mult))