@fluritheme/fluri/dist/rendering/SnowContour.js

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

import { depthAt, supportYAt } from '../physics/profiles.js';
/** Trace the collision profile itself. Empty gaps stay empty; no decorative height is invented. */
export function buildSnowContours(surface) {
    if (surface.occluded ||
        surface.width <= 0 ||
        surface.binSize <= 0 ||
        surface.profile.length === 0)
        return [];
    const step = Math.max(0.5, Math.min(2, surface.binSize / 3));
    const count = Math.ceil(surface.width / step);
    const contours = [];
    let current;
    let previous = { x: 0, depth: 0, base: supportYAt(surface, 0) };
    for (let index = 0; index <= count; index++) {
        const x = Math.min(surface.width, index * step);
        const bin = Math.min(surface.profile.length - 1, Math.floor(x / surface.binSize));
        const depth = surface.exposed?.[bin] === 0 ? 0 : Math.max(0, depthAt(surface, x));
        const point = { x, depth, base: supportYAt(surface, x) };
        if (depth > 0.06) {
            if (!current)
                current = { points: index === 0 ? [] : [previous], peak: 0 };
            current.points.push(point);
            current.peak = Math.max(current.peak, depth);
        }
        else if (current) {
            current.points.push(point);
            if (current.peak > 0.15)
                contours.push(current);
            current = undefined;
        }
        previous = point;
    }
    if (current && current.peak > 0.15)
        contours.push(current);
    return contours;
}
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