31 lines
1.3 KiB
JavaScript
31 lines
1.3 KiB
JavaScript
import { Action } from './model.js'
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import { update } from './game.js'
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import { newGame } from './spawn.js'
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import { view } from './view.js'
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import { map as mapIO, randomSeed, drawScene } from './io.js'
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import { keyDowns, interval, map, filterMap, merge, scan, startWith } from './stream.js'
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import { keyToAction } from './input.js'
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export const TICK_MS = 150
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export const FRAME_MS = 25
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// Everything that can happen to the game: a Tick every TICK_MS, and a Turn for each steering key.
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export const classicActions = merge(
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map(interval(TICK_MS), () => Action.Tick),
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filterMap(keyDowns, keyToAction))
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// m10: a Frame every FRAME_MS instead of a Tick; the game itself decides (movesEvery) which frames take a step.
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export const speedActions = merge(
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map(interval(FRAME_MS), () => Action.Frame),
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filterMap(keyDowns, keyToAction))
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// Actions folded into game states. startWith puts the initial state first so it is drawn right away.
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export const states = (seed, actions) =>
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startWith(scan(actions, update, newGame(seed)), newGame(seed))
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export const render = (state) => drawScene(view(state))
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// The whole program as a value: get a seed, then turn the stream of states into a stream of drawings.
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// Nothing runs here; runtime.js interprets it.
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export const main = mapIO(randomSeed, (seed) => map(states(seed, speedActions), render))
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