define(function(require) {

 'use strict';

 // var zrUtil = require('zrender/core/util');
 var coordinateSystemCreators = {};

 function CoordinateSystemManager() {

 this._coordinateSystems = {};

 this._coordinateSystemsList = [];
 }

 CoordinateSystemManager.prototype = {

 constructor: CoordinateSystemManager,

 update: function (ecModel, api) {
 var coordinateSystems = {};
 for (var type in coordinateSystemCreators) {
 coordinateSystems[type] = coordinateSystemCreators[type].create(ecModel, api);
 }

 this._coordinateSystems = coordinateSystems;
 },

 get: function (type, idx) {
 var list = this._coordinateSystems[type];
 if (list) {
 return list[idx || 0];
 }
 }
 };

 CoordinateSystemManager.register = function (type, coordinateSystemCreator) {
 coordinateSystemCreators[type] = coordinateSystemCreator;
 };

 return CoordinateSystemManager;
});