image-in-browser/lib/common/math-utils.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

export class MathUtils {
    static fract(x) {
        return x - Math.floor(x);
    }
    static smoothStep(edge0, edge1, x) {
        const t0 = (x - edge0) / (edge1 - edge0);
        const t = MathUtils.clamp(t0, 0, 1);
        return t * t * (3 - 2 * t);
    }
    static mix(x, y, a) {
        return x * (1 - a) + y * a;
    }
    static sign(x) {
        return x < 0 ? -1 : x > 0 ? 1 : 0;
    }
    static step(edge, x) {
        return x < edge ? 0 : 1;
    }
    static length3(x, y, z) {
        return Math.sqrt(x * x + y * y + z * z);
    }
    static gcd(x, y) {
        let _x = Math.abs(x);
        let _y = Math.abs(y);
        while (_y) {
            const t = _y;
            _y = _x % _y;
            _x = t;
        }
        return _x;
    }
    static clamp(num, low, high) {
        return Math.max(low, Math.min(num, high));
    }
    static clampInt(num, low, high) {
        return Math.trunc(MathUtils.clamp(num, low, high));
    }
    static clampInt255(num) {
        return Math.trunc(MathUtils.clamp(num, 0, 255));
    }
}
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