/*
* Copyright 2003-2006, 2009, 2017, United States Government, as represented by the Administrator of the
* National Aeronautics and Space Administration. All rights reserved.
*
* The NASAWorldWind/WebWorldWind platform is licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @exports LookAtNavigator
*/
define([
'../geom/Location',
'../navigate/Navigator',
],
function (Location,
Navigator) {
"use strict";
/**
* Constructs a look-at navigator.
* @alias LookAtNavigator
* @constructor
* @augments Navigator
* @classdesc Represents a navigator containing the required variables to enable the user to pan, zoom and tilt
* the globe.
*/
var LookAtNavigator = function () {
Navigator.call(this);
/**
* The geographic location at the center of the viewport.
* @type {Location}
*/
this.lookAtLocation = new Location(30, -110);
/**
* The distance from this navigator's eye point to its look-at location.
* @type {Number}
* @default 10,000 kilometers
*/
this.range = 10e6; // TODO: Compute initial range to fit globe in viewport.
// Development testing only. Set this to false to suppress default navigator limits on 2D globes.
this.enable2DLimits = true;
};
LookAtNavigator.prototype = Object.create(Navigator.prototype);
return LookAtNavigator;
});