46 lines
1.5 KiB
TypeScript
46 lines
1.5 KiB
TypeScript
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import { resolveBoundaryCondition, resolveBoundaryIndex } from '../caRuntime.js'
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import type { Cells, SceneParams } from '../types.js'
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import { emptyCellsLike } from './cellGrid.js'
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function parseOuterTotalisticRule(ruleId: string) {
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const match = /^B([0-8]*)\/S([0-8]*)$/i.exec(ruleId)
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if (!match) return { birth: new Set([3]), survival: new Set([2, 3]) }
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return {
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birth: new Set(match[1].split('').map(Number)),
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survival: new Set(match[2].split('').map(Number))
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}
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}
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export function stepOuterTotalistic2d(cells: Cells, settings: SceneParams) {
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const rule = parseOuterTotalisticRule(settings.simulation?.ruleId ?? 'B3/S23')
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const next = emptyCellsLike(cells)
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const height = cells.length
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const width = cells[0]?.length ?? 0
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const boundary = resolveBoundaryCondition(settings.simulation?.grid)
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for (let y = 0; y < height; y += 1) {
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for (let x = 0; x < width; x += 1) {
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let neighbours = 0
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for (let dy = -1; dy <= 1; dy += 1) {
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for (let dx = -1; dx <= 1; dx += 1) {
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if (dx === 0 && dy === 0) continue
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const rawX = x + dx
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const rawY = y + dy
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const nx = resolveBoundaryIndex(rawX, width, boundary)
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const ny = resolveBoundaryIndex(rawY, height, boundary)
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if (nx === null || ny === null) continue
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if (cells[ny][nx]) neighbours += 1
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}
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}
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next[y][x] = cells[y][x] ? rule.survival.has(neighbours) : rule.birth.has(neighbours)
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}
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}
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return next
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}
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