abhin4v/frpong
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Added key controls for gravity, removed slider. Changed the message display.

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This commit is contained in:
Abhinav Sarkar 2013-10-15 23:04:42 +05:30
parent 724f91ec8f
commit e023942ac2
3 changed files with 42 additions and 32 deletions
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27
resources/public/index.html
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@ -13,9 +13,6 @@ body {
#title {
margin: 0px;
position: absolute;
width: 98%;
z-index: -1;
}
#ball {
@ -38,6 +35,7 @@ body {
#canvas {
border: 2px green solid;
margin-top: 3px;
}
#score {
@ -45,20 +43,25 @@ body {
text-anchor: middle;
dominant-baseline: central;
}
#msg {
position: absolute;
width: 98%;
top: 40px;
font-size: 1.2em;
}
#msg .imp {
font-size: xx-large;
font-weight: bold;
}
</style>
</head>
<body>
<center>
<div id="screen">
<h2 id="title">Gravity Pong!</h2>
<div>
<span style="float: left; vertical-align: top;">Gravity
0 <input id="gravity" type="range" min="0" max="10" value="1" step="1" /> 10
</span>
<span style="float: right; font-size: smaller">
<span id="state">press &lt;space&gt; to start</span>
</span>
</div>
<div id="msg"></div>
<svg id="canvas">
<circle id="mass" />
<text id="score">0</text>
@ -70,7 +73,7 @@ body {
<div style="float: left">
fps <span id="fps">0</span>
</div>
use W-S keys to move the left paddle and Up-Down arrow keys to move the right paddle
use W-S and Up-Down keys to move the paddles / use Left-Right keys to change gravity
<div style="float: right">
<a target="_blank" href="https://github.com/abhin4v/frpong">Source</a>
</div>

35
src/cljs/frpong/core.cljs
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@ -50,6 +50,11 @@
(close! c))))
c))
(defn flash [el msgs millis]
(when (not-empty msgs)
(do (dom/set-text! el (first msgs))
(.setTimeout js/window #(flash el (rest msgs) millis) millis))))
;; Global settings
(def *width* (- (.-scrollWidth (.-body js/document)) 20))
(def *height* (- (.-scrollHeight (.-body js/document)) 130))
@ -60,7 +65,7 @@
(def *ball-radius* 8)
(def *ball-speed* 0.6)
(def *init-vel-deg-lim* [35 55])
(def *perturb-factor* 0.02)
(def *perturb-factor* 0.05)
(def *init-mass-radius* 0)
@ -71,16 +76,19 @@
(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)))
;; listen for changes in the gravity input slider and set the atom value accordingly
(ev/listen! (dom/by-id "gravity") :change
#(let [val (* (int (dom/value (dom/by-id "gravity"))) 0.01)]
(reset! *gravity* val)
(dom/set-attr! (dom/by-id "mass") "r" (mass-radius))
(.blur (dom/by-id "gravity"))))
(defn setup-gravity-control []
(let [keydowns (first (event-chan :keydown))
actions { 37 #(- % *gravity-step*) 39 #(+ % *gravity-step*) }]
(go-loop
(let [k (:keyCode (<! keydowns))]
(when (contains? actions k)
(do (swap! *gravity* #(max 0 (min 10 ((actions k) %))))
(dom/set-attr! (dom/by-id "mass") "r" (mass-radius))))))))
(defn layout-game
"Lays out the game screen."
@ -268,7 +276,7 @@
:moving vel
:gameover 0))
(defn perturb [v] (* v (+ 1 (/ (- (rand) 0.5) (/ 0.5 *perturb-factor*)))))
(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.
@ -317,15 +325,13 @@
Reads the current values from the signals supplied as parameters."
[ticks game-state pos pd-pos]
(let [ball-el (dom/by-id "ball")
state-el (dom/by-id "state")
score-el (dom/by-id "score")
lpaddle-el (dom/by-id "lpaddle")
rpaddle-el (dom/by-id "rpaddle")
fps-el (dom/by-id "fps")
title-el (dom/by-id "title")]
msg-el (dom/by-id "msg")]
(dom/set-style! ball-el "fill" "orange")
(dom/set-text! state-el "")
(dom/set-text! title-el "Gravity Pong!")
(dom/set-text! msg-el "")
(go (loop [fps-p nil score-p nil]
(let [fps (int (/ 1000 (<! ticks)))
[x y] (<! pos)
@ -342,12 +348,13 @@
(dom/set-text! score-el score))
(when (= state :gameover)
(do (dom/set-style! ball-el "fill" "red")
(dom/set-text! state-el "press <space> to restart")
(dom/set-text! title-el "GAME OVER")
(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-control)
(layout-game)
(dom/set-text! (dom/by-id "msg") "press <space> to start")
(start-on-space))

12
src/cljs/frpong/helpers.cljs
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@ -128,13 +128,13 @@
(defn event-chan
([event-type]
(let [c (chan)]
(ev/listen! ev/root-element event-type #(put! c %))
[c #(do (ev/unlisten! ev/root-element event-type) (close! c))]))
(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)]
(ev/listen! node event-type #(put! c %))
[c #(do (ev/unlisten! node event-type) (close! c))])))
(let [c (chan)
[lkey] (ev/listen! node event-type #(put! c %))]
[c #(do (ev/unlisten-by-key! lkey) (close! c))])))
(defn key-chan [keydowns keyups sampler keycodes]
(let [c (chan)