(function() {
    'use strict';
    // the 0.0001 offset fixes a bug in Chrome 27
    var PIx2 = (Math.PI * 2) - 0.0001,
        CIRCLE = 'Circle';

    /**
     * Circle constructor
     * @constructor
     * @memberof Konva
     * @augments Konva.Shape
     * @param {Object} config
     * @param {Number} config.radius
     * @@shapeParams
     * @@nodeParams
     * @example
     * // create circle
     * var circle = new Konva.Circle({
     *   radius: 40,
     *   fill: 'red',
     *   stroke: 'black'
     *   strokeWidth: 5
     * });
     */
    Konva.Circle = function(config) {
        this.___init(config);
    };

    Konva.Circle.prototype = {
        _centroid: true,
        ___init: function(config) {
            // call super constructor
            Konva.Shape.call(this, config);
            this.className = CIRCLE;
            this.sceneFunc(this._sceneFunc);
        },
        _sceneFunc: function(context) {
            context.beginPath();
            context.arc(0, 0, this.getRadius(), 0, PIx2, false);
            context.closePath();
            context.fillStrokeShape(this);
        },
        // implements Shape.prototype.getWidth()
        getWidth: function() {
            return this.getRadius() * 2;
        },
        // implements Shape.prototype.getHeight()
        getHeight: function() {
            return this.getRadius() * 2;
        },
        // implements Shape.prototype.setWidth()
        setWidth: function(width) {
            Konva.Node.prototype.setWidth.call(this, width);
            if (this.radius() !== width / 2) {
                this.setRadius(width / 2);
            }
        },
        // implements Shape.prototype.setHeight()
        setHeight: function(height) {
            Konva.Node.prototype.setHeight.call(this, height);
            if (this.radius() !== height / 2) {
                this.setRadius(height / 2);
            }
        }
    };
    Konva.Util.extend(Konva.Circle, Konva.Shape);

    // add getters setters
    Konva.Factory.addGetterSetter(Konva.Circle, 'radius', 0);
    Konva.Factory.addOverloadedGetterSetter(Konva.Circle, 'radius');

    /**
     * get/set radius
     * @name radius
     * @method
     * @memberof Konva.Circle.prototype
     * @param {Number} radius
     * @returns {Number}
     * @example
     * // get radius
     * var radius = circle.radius();
     *
     * // set radius
     * circle.radius(10);
     */

    Konva.Collection.mapMethods(Konva.Circle);
})();