@fluritheme/fluri/dist/physics/math.js

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

export const clamp = (value, minimum, maximum) => Math.min(maximum, Math.max(minimum, value));
/** A small reproducible PRNG: simulation output never depends on Math.random(). */
export function seededRandom(seed) {
    let state = seed >>> 0;
    return () => {
        state += 0x6d2b79f5;
        let value = state;
        value = Math.imul(value ^ (value >>> 15), value | 1);
        value ^= value + Math.imul(value ^ (value >>> 7), value | 61);
        return ((value ^ (value >>> 14)) >>> 0) / 4294967296;
    };
}
/** Surface-local y is positive below its edge; deposits occupy negative local y. */
export function localToWorld(surface, x, y = 0) {
    const cosine = Math.cos(surface.angle);
    const sine = Math.sin(surface.angle);
    return { x: surface.x + x * cosine - y * sine, y: surface.y + x * sine + y * cosine };
}
export function worldToLocal(surface, point) {
    const cosine = Math.cos(surface.angle);
    const sine = Math.sin(surface.angle);
    const x = point.x - surface.x;
    const y = point.y - surface.y;
    return { x: x * cosine + y * sine, y: -x * sine + y * cosine };
}
export function surfaceNormal(surface) {
    return { x: Math.sin(surface.angle), y: -Math.cos(surface.angle) };
}
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