# Source: objects/QuadraticCurve.js

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

    /**
     * Quadratic curve object draw as quadratic curve between two points.
     *
     * Quadratic 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 {Object2D}
     */
    function QuadraticCurve()
    {
    	Line.call(this);

    	/**
    	 * Control point of the quadratic curve used to control the curvature of the line between the from and to point.
    	 *
    	 * The curve is interpolated in the direction of the control point it defined the path of the curve.
    	 *
    	 * @type {Vector2}
    	 */
    	this.controlPoint = new Vector2();
    }

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

    /**
     * Create a quadratic curve helper, to edit the curve control point.
     *
     * Helper objects are added to the parent of the curve object.
     *
     * @static
     * @param {QuadraticCurve} object Object to create the helper for.
     */
    QuadraticCurve.curveHelper = function(object)
    {
    	var fromLine = new Line();
    	fromLine.from = object.from;
    	fromLine.to = object.controlPoint;
    	object.parent.add(fromLine);

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

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

    QuadraticCurve.prototype.draw = function(context, viewport, canvas)
    {
    	context.beginPath();
    	context.moveTo(this.from.x, this.from.y);
    	context.quadraticCurveTo(this.controlPoint.x, this.controlPoint.y, this.to.x, this.to.y);
    	context.stroke();
    };

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

    	data.controlPoint = this.controlPoint.toArray();

    	return data;
    };

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

    	this.controlPoint.fromArray(data.controlPoint);
    };

    export {QuadraticCurve};