我最近切换到Google Maps API V3。我正在编写一个简单的例子来绘制数组中的标记,但是我不知道如何相对于标记自动居中和缩放。
我搜索了网络的高低,包括谷歌自己的文档,但没有找到明确的答案。我知道我可以简单地取坐标的平均值,但是如何相应地设置变焦?
function initialize() {
var myOptions = {
zoom: 10,
center: new google.maps.LatLng(-33.9, 151.2),
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
setMarkers(map, beaches);
}
var beaches = [
['Bondi Beach', -33.890542, 151.274856, 4],
['Coogee Beach', -33.423036, 151.259052, 5],
['Cronulla Beach', -34.028249, 121.157507, 3],
['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
['Maroubra Beach', -33.450198, 151.259302, 1]
];
function setMarkers(map, locations) {
var image = new google.maps.MarkerImage('images/beachflag.png',
new google.maps.Size(20, 32),
new google.maps.Point(0,0),
new google.maps.Point(0, 32));
var shadow = new google.maps.MarkerImage('images/beachflag_shadow.png',
new google.maps.Size(37, 32),
new google.maps.Point(0,0),
new google.maps.Point(0, 32));
var lat = map.getCenter().lat();
var lng = map.getCenter().lng();
var shape = {
coord: [1, 1, 1, 20, 18, 20, 18 , 1],
type: 'poly'
};
for (var i = 0; i < locations.length; i++) {
var beach = locations[i];
var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
shadow: shadow,
icon: image,
shape: shape,
title: beach[0],
zIndex: beach[3]
});
}
}
答案 0 :(得分:404)
是的,只需声明新的边界对象。
var bounds = new google.maps.LatLngBounds();
然后对于每个标记,扩展您的边界对象:
bounds.extend(myLatLng);
map.fitBounds(bounds);
答案 1 :(得分:179)
将所有内容排序 - 请参阅代码的最后几行 - (bounds.extend(myLatLng); map.fitBounds(bounds);
)
function initialize() {
var myOptions = {
zoom: 10,
center: new google.maps.LatLng(0, 0),
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(
document.getElementById("map_canvas"),
myOptions);
setMarkers(map, beaches);
}
var beaches = [
['Bondi Beach', -33.890542, 151.274856, 4],
['Coogee Beach', -33.923036, 161.259052, 5],
['Cronulla Beach', -36.028249, 153.157507, 3],
['Manly Beach', -31.80010128657071, 151.38747820854187, 2],
['Maroubra Beach', -33.950198, 151.159302, 1]
];
function setMarkers(map, locations) {
var image = new google.maps.MarkerImage('images/beachflag.png',
new google.maps.Size(20, 32),
new google.maps.Point(0,0),
new google.maps.Point(0, 32));
var shadow = new google.maps.MarkerImage('images/beachflag_shadow.png',
new google.maps.Size(37, 32),
new google.maps.Point(0,0),
new google.maps.Point(0, 32));
var shape = {
coord: [1, 1, 1, 20, 18, 20, 18 , 1],
type: 'poly'
};
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < locations.length; i++) {
var beach = locations[i];
var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
shadow: shadow,
icon: image,
shape: shape,
title: beach[0],
zIndex: beach[3]
});
bounds.extend(myLatLng);
}
map.fitBounds(bounds);
}
答案 2 :(得分:5)
我对google maps api v3的建议是(不要认为它可以更有效地完成):
gmap : {
fitBounds: function(bounds, mapId)
{
//incoming: bounds - bounds object/array; mapid - map id if it was initialized in global variable before "var maps = [];"
if (bounds==null) return false;
maps[mapId].fitBounds(bounds);
}
}
在结果中,u将适合地图窗口中边界的所有点。
示例效果很好,你可以在这里查看www.zemelapis.lt
答案 3 :(得分:1)
答案非常适合调整标记的地图边界,但如果您想为多边形和圆形等形状展开Google地图边界,则可以使用以下代码:
For Circles
bounds.union(circle.getBounds());
对于多边形
polygon.getPaths().forEach(function(path, index)
{
var points = path.getArray();
for(var p in points) bounds.extend(points[p]);
});
对于矩形
bounds.union(overlay.getBounds());
对于折线
var path = polyline.getPath();
var slat, blat = path.getAt(0).lat();
var slng, blng = path.getAt(0).lng();
for(var i = 1; i < path.getLength(); i++)
{
var e = path.getAt(i);
slat = ((slat < e.lat()) ? slat : e.lat());
blat = ((blat > e.lat()) ? blat : e.lat());
slng = ((slng < e.lng()) ? slng : e.lng());
blng = ((blng > e.lng()) ? blng : e.lng());
}
bounds.extend(new google.maps.LatLng(slat, slng));
bounds.extend(new google.maps.LatLng(blat, blng));
答案 4 :(得分:-1)
setCenter()方法仍适用于最新版本的Maps API for Flash,其中fitBounds()不存在。
答案 5 :(得分:-15)
使用下面的一个,
map.setCenter(bounds.getCenter(),map.getBoundsZoomLevel(bounds));