ts-useful/lib/es2020/ecliptic.js

Functions for animation, color transitions, ecliptic, bezier, decasteljau, curves, three dimensional curves, smooth scrolling, random range, randomItem, mobius index, vectors, physics vectors, and easing.

import { ClampAngle } from './clampAngle';
import { tau } from './constants';
export class Ecliptic {
}
Ecliptic.deadXY = { x: 0, y: 0 };
Ecliptic.deg2Rad = tau / 360;
/**
 *
 * @param count number
 * @returns number
 */
Ecliptic.EqualRadians = (count) => tau / count;
/**
 *
 * @param count number
 * @returns number
 */
Ecliptic.EqualDegrees = (count) => 360 / count;
/**
 *
 * @param radian number
 * @returns number
 */
Ecliptic.ToDegree = (radian) => (radian >= 0 ? radian : (tau + radian)) * 360 / tau;
/**
 *
 * @param degree number
 * @returns number
 */
Ecliptic.ToRadian = (degree) => degree * Ecliptic.deg2Rad;
Ecliptic.surroundDefaults = (options) => {
    options ?? (options = {});
    const { spacing, amplitudeX, amplitudeY } = options;
    const equal = typeof (spacing) === 'undefined';
    let { distance, degree } = options;
    distance ?? (distance = 0);
    degree ?? (degree = 0);
    return { distance, degree, spacing, equal, amplitudeX, amplitudeY };
};
/**
 *
 * @param origin coordinate
 * @param target coordinate
 * @returns number
 */
Ecliptic.Radian = (origin, target) => {
    const [dx, dy] = [origin.x - target.x, origin.y - target.y];
    return Math.atan2(dy, dx);
};
/**
 *
 * @param origin coordinate
 * @param target coordinate
 * @returns number
 */
Ecliptic.Degree = (origin, target) => {
    return Ecliptic.ToDegree(Ecliptic.Radian(origin, target));
};
/**
 *
 * @param center HTMLElement | coordinate
 * @param radius number
 * @param radian number
 * @returns coordinate
 */
Ecliptic.LocationByRadian = (center, radius, radian) => {
    return {
        x: Math.round(center.x + radius * Math.sin(radian)),
        y: Math.round(center.y + radius * Math.cos(radian))
    };
};
/**
 *
 * @param center HTMLElement | coordinate
 * @param radius number
 * @param degree number
 * @returns coordinate
 */
Ecliptic.LocationByDegree = (center, radius, degree) => {
    const radian = Ecliptic.ToRadian(ClampAngle(degree, -360, 360));
    return Ecliptic.LocationByRadian(center, radius, radian);
};
/**
 *
 * @param center coordinate
 * @param amount number
 * @param options surroundOptions
 * @returns coordinate[]
 */
Ecliptic.Surround = (center, amount, options) => {
    const { distance, degree, equal, spacing, amplitudeX, amplitudeY } = Ecliptic.surroundDefaults(options);
    const radians = Ecliptic.EqualRadians(amount);
    const separation = Ecliptic.ToRadian(spacing ?? 0);
    const applyAmplitude = (amplitude, originPoint, destinationPoint) => {
        return typeof (amplitude) === 'undefined' ? destinationPoint : (originPoint * (1 - amplitude)) + (destinationPoint * amplitude);
    };
    let radian = Ecliptic.ToRadian(ClampAngle(degree, -360, 360));
    const results = Array.apply(null, new Array(amount)).map((o, i) => {
        const { x, y } = Ecliptic.LocationByRadian(center, distance, radian);
        radian += equal ? radians : separation;
        return {
            x: applyAmplitude(amplitudeX, center.x, x),
            y: applyAmplitude(amplitudeY, center.y, y)
        };
    });
    return results;
};
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