40 lines
1.5 KiB
JavaScript
40 lines
1.5 KiB
JavaScript
import { todo } from './todo.js'
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/** @typedef {{x: number, y: number}} Point */
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/** @typedef {'Up'|'Down'|'Left'|'Right'} Direction */
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/** @typedef {'Playing'|'Paused'|'GameOver'|'Won'} Status */
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/** @typedef {{width: number, height: number, snake: Point[], dir: Direction, nextDir: Direction,
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* apple: Point|null, seed: number, score: number, status: Status, frame: number}} GameState */
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/** A grid cell `{x, y}`. */
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export const point = (x, y) => todo('m02')
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/** Structural equality: same x and same y. */
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export const pointEquals = (a, b) => todo('m02')
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/** The unit step for a direction: Up {0,-1}, Down {0,1}, Left {-1,0}, Right {1,0} (y grows downward). */
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export const delta = (dir) => todo('m02')
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/** The direction pointing the other way. */
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export const opposite = (dir) => todo('m02')
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/**
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* Everything that can happen to the game, as data:
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* `Tick`, `Turn(dir)`, `TogglePause`, `Restart`, `Frame`, each `{ tag, ... }`.
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* `Turn` is a function because it carries a direction; the rest are constants
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* (the getters below only exist so the stub compiles; replace them with plain values).
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*/
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export const Action = {
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get Tick() { return todo('m02') },
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Turn: (dir) => todo('m02'),
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get TogglePause() { return todo('m02') },
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get Restart() { return todo('m02') },
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get Frame() { return todo('m02') },
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}
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/**
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* A fresh game: 20x20, snake [(10,10),(9,10),(8,10)] heading Right (dir and nextDir),
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* apple null, the given seed, score 0, status 'Playing', frame 0.
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*/
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export const initialState = (seed) => todo('m02')
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