WebWorldWind/apps/util/ProjectionMenu.js

/*
 * Copyright (C) 2014 United States Government as represented by the Administrator of the
 * National Aeronautics and Space Administration. All Rights Reserved.
 */
/**
 * @exports ProjectionMenu
 * @version $Id: ProjectionMenu.js 3185 2015-06-12 19:12:09Z tgaskins $
 */
define(function () {
    "use strict";

    /**
     * Constructs a projection menu for a specified {@link WorldWindow}.
     * @alias ProjectionMenu
     * @constructor
     * @classdesc Provides a projection menu to select the projection for a World Window.
     * @param {WorldWindow} worldWindow The World Window to associate this projection menu with.
     */
    var ProjectionMenu = function (worldWindow) {
        var thisExplorer = this;

        this.wwd = worldWindow;

        this.roundGlobe = this.wwd.globe;

        this.createProjectionList();
        $("#projectionDropdown").find(" li").on("click", function (e) {
            thisExplorer.onProjectionClick(e);
        });
    };

    ProjectionMenu.prototype.onProjectionClick = function (event) {
        var projectionName = event.target.innerText || event.target.innerHTML;
        $("#projectionDropdownTitle").html(projectionName + "<span class='caret'></span>");

        if (projectionName === "3D") {
            if (!this.roundGlobe) {
                this.roundGlobe = new WorldWind.Globe(new WorldWind.EarthElevationModel());
            }

            if (this.wwd.globe !== this.roundGlobe) {
                this.wwd.globe = this.roundGlobe;
            }
        } else {
            if (!this.flatGlobe) {
                this.flatGlobe = new WorldWind.Globe2D();
            }

            if (projectionName === "Equirectangular") {
                this.flatGlobe.projection = new WorldWind.ProjectionEquirectangular();
            } else if (projectionName === "Mercator") {
                this.flatGlobe.projection = new WorldWind.ProjectionMercator();
            } else if (projectionName === "North Polar") {
                this.flatGlobe.projection = new WorldWind.ProjectionPolarEquidistant("North");
            } else if (projectionName === "South Polar") {
                this.flatGlobe.projection = new WorldWind.ProjectionPolarEquidistant("South");
            } else if (projectionName === "North UPS") {
                this.flatGlobe.projection = new WorldWind.ProjectionUPS("North");
            } else if (projectionName === "South UPS") {
                this.flatGlobe.projection = new WorldWind.ProjectionUPS("South");
            } else if (projectionName === "North Gnomonic") {
                this.flatGlobe.projection = new WorldWind.ProjectionGnomonic("North");
            } else if (projectionName === "South Gnomonic") {
                this.flatGlobe.projection = new WorldWind.ProjectionGnomonic("South");
            }

            if (this.wwd.globe !== this.flatGlobe) {
                this.wwd.globe = this.flatGlobe;
            }
        }

        this.wwd.redraw();
    };

    ProjectionMenu.prototype.createProjectionList = function () {
        var projectionNames = [
            "3D",
            "Equirectangular",
            "Mercator",
            "North Polar",
            "South Polar",
            "North UPS",
            "South UPS",
            "North Gnomonic",
            "South Gnomonic"
        ];
        var projectionDropdown = $("#projectionDropdown");

        var ulItem = $('<ul class="dropdown-menu"></ul>');
        projectionDropdown.append(ulItem);

        for (var i = 0; i < projectionNames.length; i++) {
            var projectionItem = $('<li><a>' + projectionNames[i] + '</a></li>');
            ulItem.append(projectionItem);
        }
    };

    return ProjectionMenu;
});