import { Point } from "./Point.js";

class Segment
{
    /**
     * @param {Point} start
     * @param {Point} stop
     */
    constructor(start, stop)
    {
        /**
         * @type {Point}
         */
        this.start = start === undefined ? new Point() : start;

        /**
         * @type {Point}
         */
        this.stop = stop === undefined ? new Point() : stop;

    }

    angle()
    {
        let x = this.start.x - this.stop.x,
            y = this.start.y - this.stop.y;

        return Math.atan2(y, x);
    }

    len()
    {
        let x = this.start.x - this.stop.x,
            y = this.start.y - this.stop.y;

        return (x ** 2 + y ** 2) ** (1 / 2);
    }

    /**
     * @param {CanvasRenderingContext2D} ctx 
     */
    draw(ctx)
    {
        ctx.moveTo(this.start.x, this.start.y);
        ctx.lineTo(this.stop.x, this.stop.y);
    }

    from_json(data)
    {
        this.start = this.start.from_json(data.start);
        this.stop = this.stop.from_json(data.stop);
        
        return this;
    }
}

export { Segment };