32 lines
1.2 KiB
JavaScript
32 lines
1.2 KiB
JavaScript
// m11 pong app: the same wiring as app.js (streams in, drawings out), reusing the course's modules.
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import { initialPong, PongAction } from './model.js'
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import { pongUpdate } from './rules.js'
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import { pongView } from './view.js'
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import { map as mapIO, randomSeed, drawScene } from '../io.js'
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import { keyDowns, keyUps, interval, map, filterMap, merge, scan, startWith } from '../stream.js'
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export const FRAME_MS_PONG = 30
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const keys = {
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ArrowUp: 'Up', w: 'Up',
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ArrowDown: 'Down', s: 'Down',
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}
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// hasOwn, not `key in keys`: "constructor" and "toString" are inherited, not keys we mapped.
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export const pongKey = (isDown, key) =>
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Object.hasOwn(keys, key) ? (isDown ? PongAction.Press : PongAction.Release)(keys[key])
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: key === 'r' && isDown ? PongAction.Restart
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: null
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export const pongActions = merge(
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map(interval(FRAME_MS_PONG), () => PongAction.Frame),
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merge(
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filterMap(keyDowns, (key) => pongKey(true, key)),
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filterMap(keyUps, (key) => pongKey(false, key))))
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export const pongStates = (seed, actions) =>
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startWith(scan(actions, pongUpdate, initialPong(seed)), initialPong(seed))
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export const pongMain = mapIO(randomSeed, (seed) =>
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map(pongStates(seed, pongActions), (state) => drawScene(pongView(state))))
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