@fluritheme/fluri/dist/seedDeposits.js

Interactive snowfall for websites: DOM-aware snow accumulation, mouse interactions, snow physics, Canvas 2D rendering, and Christmas effects.

import { deposit, seededRandom } from './physics/index.js';
/** A manual snow source with distinct broad drifts, measured in mean CSS-pixel depth. */
export function seedDeposits(surface, amount, maxDepth, seed) {
    if (!(amount > 0) || surface.width <= 0 || surface.binSize <= 0)
        return 0;
    const random = seededRandom(seed);
    const count = Math.max(2, Math.ceil(surface.width / 105));
    const drifts = Array.from({ length: count }, (_, index) => ({
        x: ((index + 0.15 + random() * 0.7) / count) * surface.width,
        spread: Math.max(10, Math.min(65, (surface.width / count) * (0.2 + random() * 0.25))),
        strength: 0.4 + random() * 1.2,
    }));
    const weights = Array.from(surface.profile, (_, index) => {
        const x = (index + 0.5) * surface.binSize;
        return drifts.reduce((sum, drift) => {
            const distance = (x - drift.x) / drift.spread;
            return sum + drift.strength * Math.exp(-0.5 * distance * distance);
        }, 0.035);
    });
    const normalization = weights.reduce((sum, weight) => sum + weight, 0);
    const mass = amount * surface.width;
    let accepted = 0;
    for (let index = 0; index < weights.length; index++) {
        accepted += deposit(surface.profile, surface.binSize, (index + 0.5) * surface.binSize, (mass * (weights[index] ?? 0)) / normalization, maxDepth, surface.packing);
    }
    return accepted;
}
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