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Cleaned up code, fixed collision detection

master
Abhinav Sarkar 2013-09-25 22:05:07 +05:30
parent b367dfe6cb
commit 25ab05ede0
2 changed files with 46 additions and 29 deletions
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1
resources/public/index.html
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@ -10,6 +10,7 @@
<body> <body>
<div>FPS: <span id="fps"></span></div> <div>FPS: <span id="fps"></span></div>
<div>Position: <span id="pos"></span></div> <div>Position: <span id="pos"></span></div>
<div>Velocity: <span id="vel"></span></div>
<svg style="width: 300px; height: 200px; border: 1px black solid" id="canvas"> <svg style="width: 300px; height: 200px; border: 1px black solid" id="canvas">
<circle id="ball" r="5" cx="5" cy="100"/> <circle id="ball" r="5" cx="5" cy="100"/>
</svg> </svg>

74
src/cljs/frpong/core.cljs
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@ -30,6 +30,8 @@
;; | renderer | ;; | renderer |
;; +----------+ ;; +----------+
(defn abs [x] (.abs js/Math x))
(defn positioner [tick-chan vel-chan pos-chan-in pos-chan-out] (defn positioner [tick-chan vel-chan pos-chan-in pos-chan-out]
(go-loop (go-loop
(let [tick (<! tick-chan) (let [tick (<! tick-chan)
@ -40,43 +42,57 @@
(defn collision-detector [width height padding tick-chan pos-chan vel-chan-in vel-chan-out] (defn collision-detector [width height padding tick-chan pos-chan vel-chan-in vel-chan-out]
(go-loop (go-loop
(let [tick (<! tick-chan) (let [adjust-v (fn [p v size]
(cond
(< p padding) (abs v)
(> p (- size padding)) (- (abs v))
:else v))
tick (<! tick-chan)
[vel-x vel-y] (<! vel-chan-in) [vel-x vel-y] (<! vel-chan-in)
[x y] (<! pos-chan) [x y] (<! pos-chan)
[xn yn] [(+ x (* vel-x tick)) (+ y (* vel-y tick))] [xn yn] [(+ x (* vel-x tick)) (+ y (* vel-y tick))]
vel-xn (if (and (> xn padding) (< xn (- width padding))) vel-x (- vel-x)) vel-xn (adjust-v xn vel-x width)
vel-yn (if (and (> yn padding) (< yn (- height padding))) vel-y (- vel-y))] vel-yn (adjust-v yn vel-y height)]
(>! vel-chan-out [vel-xn vel-yn])))) (>! vel-chan-out [vel-xn vel-yn]))))
(defn render-loop [pos-chan vel-chan]
(go-loop
(let [[x y] (map int (<! pos-chan))
vel (<! vel-chan)]
(dom/set-text! (dom/by-id "pos") [x y])
(dom/set-text! (dom/by-id "vel") vel)
(dom/set-attr! (dom/by-id "ball") "cx" x)
(dom/set-attr! (dom/by-id "ball") "cy" y))))
(defn game-setup [width height padding frame-chan pos-chan vel-chan]
(let [[tick-chan-pos tick-chan-collsion] (h/dup-chan (h/diff-chan frame-chan))
[pos-chan-pos pos-chan-render pos-chan-collision] (h/multiplex pos-chan 3)
[vel-chan-pos vel-chan-collision vel-chan-render] (h/multiplex vel-chan 3)]
(positioner tick-chan-pos vel-chan-pos pos-chan-pos pos-chan)
(collision-detector width height padding
tick-chan-collsion pos-chan-collision vel-chan-collision vel-chan)
[pos-chan-render vel-chan-render]))
(defn game-init [width height padding init-pos init-vel frame-chan]
(let [pos-chan (chan 1)
vel-chan (chan 1)
[pos-chan-render vel-chan-render]
(game-setup width height padding frame-chan pos-chan vel-chan)]
(put! pos-chan init-pos)
(put! vel-chan init-vel)
(render-loop pos-chan-render vel-chan-render)))
(defn ^:export init [] (defn ^:export init []
(let [frame-chan (h/frame-chan) (let [frame-chan (h/frame-chan)
[frame-chan1 frame-chan2] (h/dup-chan frame-chan) [frame-chan-fps frame-chan-game] (h/dup-chan frame-chan)
fps-chan (h/map-chan #(/ 1000 %) (h/diff-chan frame-chan2)) fps-chan (h/map-chan #(/ 1000 %) (h/diff-chan frame-chan-fps))
width 300 width 300
height 200 height 200
padding 5 padding 5
init-pos [5 100] init-pos [5 100]
init-vel [0.1 0.12] init-vel [0.2 0.22]]
(go-loop (dom/set-text! (dom/by-id "fps") (<! fps-chan)))
[tick-chan-pos tick-chan-collsion] (h/dup-chan (h/diff-chan frame-chan1)) (game-init width height padding init-pos init-vel frame-chan-game)))
pos-chan (chan)
[pos-chan-pos pos-chan-render pos-chan-collision] (h/multiplex pos-chan 3)
vel-chan (chan)
[vel-chan-pos vel-chan-collision] (h/dup-chan vel-chan)]
(positioner tick-chan-pos vel-chan-pos pos-chan-pos pos-chan)
(collision-detector width height padding
tick-chan-collsion pos-chan-collision vel-chan-collision vel-chan)
(go (>! pos-chan init-pos))
(go (>! vel-chan init-vel))
(go-loop
(let [[x y] (map int (<! pos-chan-render))]
(dom/set-text! (dom/by-id "fps") (<! fps-chan))
(dom/set-text! (dom/by-id "pos") [x y])
(dom/set-attr! (dom/by-id "ball") "cx" x)
(dom/set-attr! (dom/by-id "ball") "cy" y)))))