source: tmcsimulator/trunk/webapps/visualizer/js/controls.js @ 516

    // Initialize the center button (to re-center the map)
    function initCenter()
    {
        var centerBtnDiv = document.getElementById('ctrButton');
        map.controls[google.maps.ControlPosition.RIGHT_CENTER].push(centerBtnDiv)
        centerBtnDiv.title = 'Click to recenter the map';

        // Setup the click event listeners: reset center location and zoom factor
        centerBtnDiv.addEventListener('click', function()
        {
            map.setCenter(centerPoint);
            map.setZoom(initZoom);
            clearPlacePins();
        });
    }

    // Initialize the search box and listener 
    function initSearch()
    {
        // Create the search box and link it to the UI element.
        var input = document.getElementById('search-input');
        var searchBox = new google.maps.places.SearchBox(input);
        map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

        // Bias the SearchBox results towards current map's viewport.
        map.addListener('bounds_changed', function()
        {
            searchBox.setBounds(map.getBounds());
        });

        // Listen for the event fired when the user selects a prediction and retrieve
        // more details for that place.
        searchBox.addListener('places_changed', function()
        {
            var places = searchBox.getPlaces();

            if (places.length == 0)
            {
                return;
            }

            clearPlacePins();

            // Create a bounding region to include the search result places
            var bounds = new google.maps.LatLngBounds();
            // For each place, get the icon, name and location.
            // There may be multiple search results
            places.forEach(function(place)
            {
                if (!place.geometry)
                {
                    console.log("Returned place contains no geometry");
                    return;
                }

                // Create a marker for each place.
                placeMarker = new google.maps.Marker(
                {
                    map: map,
                    title: place.name,
                    position: place.geometry.location
                })

                // Click on the marker to remove it from the display
                placeMarker.addListener('click', function()
                {
                    placeMarker.setMap(null);
                });

                // Add this marker to the collection of current markers 
                placePins.push(placeMarker);

                // Create a bounding region to include this place
                if (place.geometry.viewport)
                {
                    // Only geocodes have viewport.
                    bounds.union(place.geometry.viewport);
                }
                else
                {
                    bounds.extend(place.geometry.location);
                }
            });
            // This will pan and zoom to the area around the marker
            //map.fitBounds(bounds);
            // This will center the map on the new marker(s) but not zoom
            map.setCenter(bounds.getCenter());
        });
    }

    // Remove any place pins from a previous search
    function clearPlacePins()
    {
        placePins.forEach(function(marker)
        {
            marker.setMap(null);
        });
        placePins = [];
    }