# Source: objects/BezierCurve.js

    import {Object2D} from "../Object2D.js";
    import {Vector2} from "../math/Vector2.js";
    import {Circle} from "./Circle.js";
    import {Line} from "./Line.js";

    /**
     * Bezier curve object draw as bezier curve between two points.
     *
     * Bezier curve data is composed of two anchor points, one for the start of the curve and one for the end of the curve.
     *
     * @class
     * @extends {Line}
     */
    function BezierCurve()
    {
    	Line.call(this);

    	/**
    	 * Initial position control point, indicates the tangent of the bezier curve on the first point.
    	 *
    	 * @type {Vector2}
    	 */
    	this.fromCp = new Vector2();

    	/**
    	 * Final position control point, indicates the tangent of the bezier curve on the last point.
    	 *
    	 * @type {Vector2}
    	 */
    	this.toCp = new Vector2();
    }

    BezierCurve.prototype = Object.create(Line.prototype);
    BezierCurve.prototype.constructor = BezierCurve;
    BezierCurve.prototype.type = "BezierCurve";
    Object2D.register(BezierCurve, "BezierCurve");

    /**
     * Create a bezier curve helper, to edit the bezier curve anchor points.
     *
     * Helper objects are added to the parent of the curve object.
     *
     * @static
     * @param {BezierCurve} object Object to create the helper for.
     */
    BezierCurve.curveHelper = function(object)
    {
    	var fromCp = new Circle();
    	fromCp.radius = 3;
    	fromCp.layer = object.layer + 1;
    	fromCp.draggable = true;
    	fromCp.onPointerDrag = function(pointer, viewport, delta)
    	{
    		Object2D.prototype.onPointerDrag.call(this, pointer, viewport, delta);
    		object.fromCp.copy(fromCp.position);
    	};
    	object.parent.add(fromCp);

    	var fromLine = new Line();
    	fromLine.from = object.from;
    	fromLine.to = object.fromCp;
    	object.parent.add(fromLine);

    	var toCp = new Circle();
    	toCp.radius = 3;
    	toCp.layer = object.layer + 1;
    	toCp.draggable = true;
    	toCp.onPointerDrag = function(pointer, viewport, delta)
    	{
    		Object2D.prototype.onPointerDrag.call(this, pointer, viewport, delta);
    		object.toCp.copy(toCp.position);
    	};
    	object.parent.add(toCp);

    	var toLine = new Line();
    	toLine.from = object.to;
    	toLine.to = object.toCp;
    	object.parent.add(toLine);
    };

    BezierCurve.prototype.draw = function(context, viewport, canvas)
    {
    	context.beginPath();
    	context.moveTo(this.from.x, this.from.y);
    	context.bezierCurveTo(this.fromCp.x, this.fromCp.y, this.toCp.x, this.toCp.y, this.to.x, this.to.y);
    	context.stroke();
    };

    BezierCurve.prototype.serialize = function(recursive)
    {
    	var data = Line.prototype.serialize.call(this, recursive);

    	data.fromCp = this.fromCp.toArray();
    	data.toCp = this.toCp.toArray();

    	return data;
    };

    BezierCurve.prototype.parse = function(data, root)
    {
    	Line.prototype.parse.call(this, data, root);

    	this.fromCp.fromArray(data.fromCp);
    	this.toCp.fromArray(data.toCp);
    };

    export {BezierCurve};