/*
* Copyright 2003-2006, 2009, 2017, 2020 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.
*
* NASAWorldWind/WebWorldWind also contains the following 3rd party Open Source
* software:
*
* ES6-Promise – under MIT License
* libtess.js – SGI Free Software License B
* Proj4 – under MIT License
* JSZip – under MIT License
*
* A complete listing of 3rd Party software notices and licenses included in
* WebWorldWind can be found in the WebWorldWind 3rd-party notices and licenses
* PDF found in code directory.
*/
/**
* @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;
});