frame.akima/dist/AkimaPoint.js

A package for Akima interpolation

export class AkimaPoint {
    x;
    y;
    xOrigin;
    yOrigin;
    constructor(x, y, origin) {
        this.xOrigin = origin ? origin.X : 0;
        this.yOrigin = origin ? origin.Y : 0;
        this.x = x;
        this.y = y;
    }
    get X() {
        return this.x;
    }
    set X(value) {
        this.x = value;
    }
    get Y() {
        return this.y;
    }
    set Y(value) {
        this.y = value;
    }
    get XY() {
        return { x: this.X, y: this.Y };
    }
    get Radius() {
        return (Math.round(Math.sqrt(this.X * this.X + this.Y * this.Y) * 1000) / 1000);
    }
    /**
     * Calculates the angle in radians between the line connecting this point to the given origin and the positive X-axis.
     * The result is normalized to the range [0, 2π) and rounded to three decimal places.
     *
     * @param origin - The reference point from which the angle is measured.
     * @returns The angle in radians, rounded to three decimal places, in the range [0, 2π).
     */
    relAtan(origin) {
        const cos = this.X - origin.X;
        const sin = this.Y - origin.Y;
        let atan2 = Math.atan2(sin, cos); // atan2 range is [-PI, PI]
        if (atan2 < 0) {
            // atan2 is negative, add 2 * Math.PI to make it positive
            atan2 += Math.PI * 2;
        }
        return Math.round(atan2 * 1000) / 1000;
    }
}