generate.js

import { replicate } from './util.js'

export const generators = {
    Field2D(width, height) {
        const TARGET_CELLS = 1000000

        const scale = Math.ceil(Math.sqrt(width * height / TARGET_CELLS))
        const xLength = Math.ceil(width / scale)
        const yLength = Math.ceil(height / scale)
        field = replicate(xLength, () => replicate(yLength, () => [ 0, 0 ]))

        return { ...this.Particles([ width, height ]), field }
    },

    Particles(dimensions) {
        const QUANTITY = 1000

        const particles = replicate(QUANTITY, () => ({
            position: dimensions.map((dim) => (Math.random() - .5) * dim),
            velocity: dimensions.map(() => Math.random() - .5),
            mass: 1
        }))

        return { particles }
    },
}