161 lines
6.4 KiB
Clojure
161 lines
6.4 KiB
Clojure
(ns frpong.core
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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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[frpong.core :refer (go-loop)]))
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;;
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;; Signal Diagram
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;;
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;; +---------------------+
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;; | +-------------+ |
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;; | | | |
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;; v v | |
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;; +----------+ vel-chan | |
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;; +-->|c-detector+----------+ |
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;; | +----------+ | |
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;; | +-----------------+ |
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;; | | +-----------------+
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;; | | | |
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;; | v v |
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;; +---------+ frame-chan +------+ tick-chan | +----------+ pos-chan |
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;; |frame-gen+------------>|ticker+-----------+-->|positioner+--------------+
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;; +---------+ +------+ +----------+ |
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;; +---------------------+
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;; |
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;; v
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;; +----------+
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;; | renderer |
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;; +----------+
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(defn abs [x] (.abs js/Math x))
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(defn tick-chan [frames]
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(let [c (chan)]
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(go
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(loop [prev (<! frames)]
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(let [t (<! frames)]
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(when (< t (* 10 prev))
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(>! c t))
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(recur t))))
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c))
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(defn ball-positioner [ticks vel pos-in pos-out]
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(go-loop
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(let [tick (<! ticks)
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[vel-x vel-y] (<! vel)
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[x y] (<! pos-in)
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pos-next [(+ x (* vel-x tick)) (+ y (* vel-y tick))]]
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(>! pos-out pos-next))))
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(defn collision-detector
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[{:keys [width height padding]}
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ticks ball-state pos pl-pos pr-pos vel-in vel-out]
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(let [adjust-v (fn [p v size]
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(cond
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(< p padding) [(abs v) :collision]
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(> p (- size padding)) [(- (abs v)) :collision]
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:else [v :moving]))]
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(go-loop
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(let [tick (<! ticks)
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[vel-x vel-y] (<! vel-in)
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[x y] (<! pos)
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pl-pos (<! pl-pos)
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pr-pos (<! pr-pos)
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[xn yn] [(+ x (* vel-x tick)) (+ y (* vel-y tick))]
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[vel-xn bs-x] (adjust-v xn vel-x width)
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[vel-yn bs-y] (adjust-v yn vel-y height)]
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(>! vel-out [vel-xn vel-yn])
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(>! ball-state
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(if (or (= bs-x :collision) (= bs-y :collision)) :collision :moving))))))
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(defn paddle-positioner [keycodes max-y movement pos-in pos-out]
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(let [keys (h/key-chan keycodes)]
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(go-loop
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(let [dir (<! keys)
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pos (<! pos-in)]
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(>! pos-out
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(condp = dir
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:up (max (- pos movement) 0)
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:down (min (+ pos movement) max-y)))))))
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(defn renderer [ball-state pos vel pl-pos pr-pos]
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(let [pos-el (dom/by-id "pos")
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vel-el (dom/by-id "vel")
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ball-el (dom/by-id "ball")
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lpaddle-el (dom/by-id "lpaddle")
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rpaddle-el (dom/by-id "rpaddle")]
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(go-loop
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(let [[x y] (<! pos)]
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(dom/set-text! pos-el (map int [x y]))
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(dom/set-text! vel-el (<! vel))
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(doto ball-el
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(dom/set-attr! "cx" x)
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(dom/set-attr! "cy" y)
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(dom/set-style! "fill" (if (= :collision (<! ball-state)) "#0f0" "#000")))))
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(go-loop
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(dom/set-attr! lpaddle-el "y" (<! pl-pos)))
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(go-loop
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(dom/set-attr! rpaddle-el "y" (<! pr-pos)))))
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(defn game-setup [{:keys [width height padding paddle-size] :as layout} paddle-movement
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frames ball-state pos vel pl-pos pr-pos]
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(let [max-y (- height paddle-size)
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[tick-pos tick-collsion tick-pl tick-pr] (h/multiplex (tick-chan (h/diff-chan frames)) 4)
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[pos-pos pos-collision pos-render] (h/multiplex pos 3)
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[vel-pos vel-collision vel-render] (h/multiplex vel 3)
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[pl-pos-pos pl-pos-collision pl-pos-render] (h/multiplex pl-pos 3)
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[pr-pos-pos pr-pos-collision pr-pos-render] (h/multiplex pr-pos 3)]
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(ball-positioner tick-pos vel-pos pos-pos pos)
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(collision-detector layout tick-collsion ball-state pos-collision
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(h/sustain pl-pos-collision tick-pl)
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(h/sustain pr-pos-collision tick-pr)
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vel-collision vel)
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(paddle-positioner {83 :down 87 :up} max-y paddle-movement pl-pos-pos pl-pos)
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(paddle-positioner {38 :up 40 :down} max-y paddle-movement pr-pos-pos pr-pos)
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[ball-state pos-render vel-render pl-pos-render pr-pos-render]))
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(defn game-init [{:keys [height paddle-size] :as layout}
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{:keys [init-pos init-vel paddle-movement]} frames]
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(let [init-paddle-pos (/ (- height paddle-size) 2)
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pos (chan 1)
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vel (chan 1)
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pl-pos (chan 1)
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pr-pos (chan 1)
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ball-state (chan 1)]
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(put! pos init-pos)
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(put! vel init-vel)
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(put! pl-pos init-paddle-pos)
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(put! pr-pos init-paddle-pos)
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(apply renderer
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(game-setup layout paddle-movement frames ball-state pos vel pl-pos pr-pos))))
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(defn ^:export init []
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(let [frames (h/map-chan first (h/frame-chan))
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[frames-fps frames-count frames-game] (h/multiplex frames 3)
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fps (h/map-chan #(/ 1000 %) (h/diff-chan frames-fps))
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frames-count (h/counting-chan frames-count)
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layout {:width 600
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:height 300
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:padding 5
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:paddle-size 80}
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init-vals {:init-pos [5 100]
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:init-vel [0.2 0.22]
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:paddle-movement 10}
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fps-el (dom/by-id "fps")
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frame-el (dom/by-id "frame")]
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(doto (dom/by-id "canvas")
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(dom/set-style! "width" (str (:width layout) "px"))
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(dom/set-style! "height" (str (:height layout) "px")))
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(go-loop
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(dom/set-text! fps-el (<! fps))
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(dom/set-text! frame-el (<! frames-count)))
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(game-init layout init-vals frames-game)))
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