var chartUtils = (function () {

    var exports = {};
    exports.override = function (_objA, _objB) { for (var x in _objA) {if (x in _objB) {_objB[x] = _objA[x];}} };
    exports.cloneJSON = function(_obj){ return JSON.parse(JSON.stringify(_obj)); };
    exports.deepExtend = function extend(destination, source) {
        for (var property in source) {
            if (source[property] && source[property].constructor &&
                source[property].constructor === Object) {
                destination[property] = destination[property] || {};
                extend(destination[property], source[property]);
            } else {
                destination[property] = source[property];
            }
        }
        return destination;
    };
    //DOMParser shim for Safari
    (function(DOMParser) {
        "use strict";
        var DOMParser_proto = DOMParser.prototype,
            real_parseFromString = DOMParser_proto.parseFromString;
        try {
            if ((new DOMParser()).parseFromString("", "text/html")) {
                return;
            }
        } catch (ex) {}

        DOMParser_proto.parseFromString = function(markup, type) {
            if (/^\s*text\/html\s*(?:;|$)/i.test(type)) {
                var doc = document.implementation.createHTMLDocument("");
                if (markup.toLowerCase().indexOf('<!doctype') > -1) {
                    doc.documentElement.innerHTML = markup;
                }
                else {
                    doc.body.innerHTML = markup;
                }
                return doc;
            } else {
                return real_parseFromString.apply(this, arguments);
            }
        };
    }(DOMParser));
    exports.throttle = function(func, wait, options) {
        var context, args, result;
        var timeout = null;
        var previous = 0;
        options = options || {};
        var later = function() {
            previous = options.leading === false ? 0 : new Date();
            timeout = null;
            result = func.apply(context, args);
            context = args = null;
        };
        return function() {
            var now = new Date();
            if (!previous && options.leading === false) {previous = now;}
            var remaining = wait - (now - previous);
            context = this;
            args = arguments;
            if (remaining <= 0) {
                clearTimeout(timeout);
                timeout = null;
                previous = now;
                result = func.apply(context, args);
                context = args = null;
            } else if (!timeout && options.trailing !== false) {
                timeout = setTimeout(later, remaining);
            }
            return result;
        };
    };
    return exports;

})();