var gmap;
var widget;
var prev = {
    lat: 0, 
    lon: 0, 
    zoom: 0
};
function czoom(lat, lon, zoom) {
    var alt = 2000000;
    switch (zoom) 
    {
    case 0:
        alt = 8000000;
    break;
    case 1:
        alt = 4000000;
    break;            
    case 2:
        alt = 2000000;
    break;            
    case 3:
        alt = 1000000;
    break;            
    case 4:
        alt = 500000;
    break;            
    case 5:
        alt = 250000;
    break;            
    case 6:
        alt = 125000;
    break;          
    case 7:
        alt = 62500;
    break;    
    case 8:
        alt = 31250;
    break;      
    case 9:
        alt = 15625;
    break;    
    case 10:
        alt = 7812;
    break;     
    case 11:
        alt = 3906;
    break;     
    case 12:
        alt = 1953;
    break;     
    case 13:
        alt = 976;
    break;     
    case 14:
        alt = 488;
    break;     
    case 15:
        alt = 488;
    break;
    case 16:
        alt = 488;
    break;
    case 17:
        alt = 488;
    break;  
    case 18:
        alt = 488;
    break;   
    case 19:
        alt = 488;      
    break;
    }
    widget.camera.flyTo({
        destination: Cesium.Cartesian3.fromDegrees(lon, lat, alt)
    });
}
function setCenter(lat, lon, zoom, mode) {
    if (mode != 'gmap') 
    {
        gmap.setCenter(new google.maps.LatLng(lat, lon));
        gmap.setZoom(zoom);
    }
    if (mode != 'cmap')
    {
        czoom(lat, lon, zoom);
    }
}
function fmt(x) {
    x = Math.round(x * 100000000) / 100000000 + '';
    if (x.match(/\.\d{1,7}/)) 
    {
        x += '00000000';
        x = x.replace(/(\.\d{8})\d*$/,'$1');
    }
    return x;
}
function init() {
    gmap = new google.maps.Map($('#gmap')[0], {
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });
    widget = new Cesium.CesiumWidget('cmap');
}
$(function() {
    init();
    setCenter(38.0, 140.0, 0);
    setInterval(function() {
        var center,
            lat,
            lon,
            zoom;
        center = gmap.getCenter();
        lat = center.lat(); 
        lon = center.lng();
        zoom = gmap.getZoom();
        if (lat != prev.lat || lon != prev.lon || zoom != prev.zoom) 
        {
            prev = {
                lat: lat, 
                lon: lon, 
                zoom: zoom
            };  
            czoom(lat, lon, zoom);
        }
    }, 800);
});