party-js/lib/systems/math.js

A JavaScript library to brighten up your user's site experience with visual effects!

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.approximately = exports.clamp = exports.invlerp = exports.slerp = exports.lerp = exports.epsilon = exports.rad2deg = exports.deg2rad = void 0;
/**
 * Constant coefficient to convert degrees to radians.
 */
exports.deg2rad = Math.PI / 180;
/**
 * Constant coefficient to convert radians to degrees.
 */
exports.rad2deg = 180 / Math.PI;
/**
 * A small value to approximately compare values.
 */
exports.epsilon = 0.000001;
/**
 * Linearly interpolates between a and b by t.
 */
function lerp(a, b, t) {
    return (1 - t) * a + t * b;
}
exports.lerp = lerp;
/**
 * Smoothly interpolates between a and b by t (using cosine interpolation).
 */
function slerp(a, b, t) {
    return lerp(a, b, (1 - Math.cos(t * Math.PI)) / 2);
}
exports.slerp = slerp;
/**
 * Inversely lerps v between a and b to find t.
 */
function invlerp(a, b, v) {
    return (v - a) / (b - a);
}
exports.invlerp = invlerp;
/**
 * Clamps the specified value between a minimum and a maximum.
 */
function clamp(value, min, max) {
    return Math.min(max, Math.max(min, value));
}
exports.clamp = clamp;
/**
 * Checks if a is approximately equal to b.
 */
function approximately(a, b) {
    return Math.abs(a - b) < exports.epsilon;
}
exports.approximately = approximately;