// 获取带padding的边界
var bounds = map.getBounds();
var ne = bounds.getNorthEast();
var sw = bounds.getSouthWest();

// 添加5%的padding
var latPadding = (ne.lat() - sw.lat()) * 0.05;
var lngPadding = (ne.lng() - sw.lng()) * 0.05;

var adjustedBounds = new google.maps.LatLngBounds(
    new google.maps.LatLng(sw.lat() + latPadding, sw.lng() + lngPadding),
    new google.maps.LatLng(ne.lat() - latPadding, ne.lng() - lngPadding)
);

function getVisibleBounds(map) {
    var bounds = map.getBounds();
    if (!bounds) return null;
    
    var center = map.getCenter();
    var ne = map.getProjection().fromLatLngToPoint(bounds.getNorthEast());
    var sw = map.getProjection().fromLatLngToPoint(bounds.getSouthWest());
    var centerPoint = map.getProjection().fromLatLngToPoint(center);
    
    // 计算可见区域的比例
    var mapDiv = map.getDiv();
    var scale = Math.pow(2, map.getZoom());
    var mapWidth = mapDiv.offsetWidth / scale;
    var mapHeight = mapDiv.offsetHeight / scale;
    
    // 调整边界
    var adjustedNe = new google.maps.Point(centerPoint.x + mapWidth/2, centerPoint.y - mapHeight/2);
    var adjustedSw = new google.maps.Point(centerPoint.x - mapWidth/2, centerPoint.y + mapHeight/2);
    
    return new google.maps.LatLngBounds(
        map.getProjection().fromPointToLatLng(adjustedSw),
        map.getProjection().fromPointToLatLng(adjustedNe)
    );
}

google.maps.event.addListener(map, 'idle', function() {
    // 确保地图完全加载后再获取边界
    var bounds = map.getBounds();
    console.log("Adjusted bounds:", bounds.toString());
});