// API key for http://openlayers.org. Please get your own at
// http://bingmapsportal.com/ and use that instead.
var apiKey = "AqTGBsziZHIJYYxgivLBf0hVdrAk9mWO5cQcb8Yux8sW5M8c8opEC2lZqKR1ZZXf";

// initialize map when page ready
var map;
var gg = new OpenLayers.Projection("EPSG:4326");
var sm = new OpenLayers.Projection("EPSG:900913");

var init = function () {

    var vector = new OpenLayers.Layer.Vector("Vector Layer", {});

    var geolocate = new OpenLayers.Control.Geolocate({
        id: 'locate-control',
        geolocationOptions: {
            enableHighAccuracy: false,
            maximumAge: 0,
            timeout: 7000
        }
    });
    // create map
    map = new OpenLayers.Map({
        div: "map",
        theme: null,
        projection: sm,
        units: "m",
        numZoomLevels: 18,
        maxResolution: 156543.0339,
        maxExtent: new OpenLayers.Bounds(
            -20037508.34, -20037508.34, 20037508.34, 20037508.34
        ),
        controls: [
            new OpenLayers.Control.Attribution(),
            new OpenLayers.Control.TouchNavigation({
                dragPanOptions: {
                    interval: 100,
                    enableKinetic: true
                }
            }),
            geolocate
        ],
        layers: [
            new OpenLayers.Layer.OSM("OpenStreetMap", null, {
                transitionEffect: 'resize'
            }),
            new OpenLayers.Layer.Bing({
                key: apiKey,
                type: "Road",
                // custom metadata parameter to request the new map style - only useful
                // before May 1st, 2011
                metadataParams: {
                    mapVersion: "v1"
                },
                name: "Bing Road",
                transitionEffect: 'resize'
            }),
            new OpenLayers.Layer.Bing({
                key: apiKey,
                type: "Aerial",
                name: "Bing Aerial",
                transitionEffect: 'resize'
            }),
            new OpenLayers.Layer.Bing({
                key: apiKey,
                type: "AerialWithLabels",
                name: "Bing Aerial + Labels",
                transitionEffect: 'resize'
            }), 
            vector
        ],
        center: new OpenLayers.LonLat(0, 0),
        zoom: 1
    });

    var style = {
        fillOpacity: 0.1,
        fillColor: '#000',
        strokeColor: '#f00',
        strokeOpacity: 0.6
    };
    geolocate.events.register("locationupdated",this,function(e) {
        vector.removeAllFeatures();
        vector.addFeatures([
            new OpenLayers.Feature.Vector(
                e.point,
                {},
                {
                    graphicName: 'cross',
                    strokeColor: '#f00',
                    strokeWidth: 2,
                    fillOpacity: 0,
                    pointRadius: 10
                }
            ),
            new OpenLayers.Feature.Vector(
                OpenLayers.Geometry.Polygon.createRegularPolygon(
                    new OpenLayers.Geometry.Point(e.point.x, e.point.y),
                    e.position.coords.accuracy/2,
                    50,
                    0
                ),
                {},
                style
            )
        ]);
        map.zoomToExtent(vector.getDataExtent());
    });
};