Javascript 如何限制Google maps API V3中的平移?
在V2中,有一种方法可以限制平移/拖动,使地图保持在特定范围内。在V3中是如何实现的 比方说,我希望用户只关注欧洲。我已经限制了缩放,但是如果我允许拖动(在本例中,由于其他原因,我必须这样做),那么用户可以平移到我想要显示的区域之外Javascript 如何限制Google maps API V3中的平移?,javascript,google-maps,google-maps-api-3,Javascript,Google Maps,Google Maps Api 3,在V2中,有一种方法可以限制平移/拖动,使地图保持在特定范围内。在V3中是如何实现的 比方说,我希望用户只关注欧洲。我已经限制了缩放,但是如果我允许拖动(在本例中,由于其他原因,我必须这样做),那么用户可以平移到我想要显示的区域之外 请给出工作示例或代码片段-我不是一个专业的程序员 诀窍是监听dragend事件,如果地图被拖出允许的边界,则将其移回内部。如果将允许的边界定义为对象,则可以使用contains()方法,因为如果给定的lat/lng参数在边界内,它将返回true <!DOCTY
请给出工作示例或代码片段-我不是一个专业的程序员 诀窍是监听
dragend
事件,如果地图被拖出允许的边界,则将其移回内部。如果将允许的边界定义为对象,则可以使用contains()
方法,因为如果给定的lat/lng参数在边界内,它将返回true
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map-canvas { height: 100% }
</style>
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false"></script>
</script>
<script type="text/javascript">
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(28.70, -127.50),
zoom: 4,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
// bounds of the desired area
var allowedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(28.70, -127.50),
new google.maps.LatLng(48.85, -55.90)
);
var boundLimits = {
maxLat : allowedBounds.getNorthEast().lat(),
maxLng : allowedBounds.getNorthEast().lng(),
minLat : allowedBounds.getSouthWest().lat(),
minLng : allowedBounds.getSouthWest().lng()
};
var lastValidCenter = map.getCenter();
var newLat, newLng;
google.maps.event.addListener(map, 'center_changed', function() {
center = map.getCenter();
if (allowedBounds.contains(center)) {
// still within valid bounds, so save the last valid position
lastValidCenter = map.getCenter();
return;
}
newLat = lastValidCenter.lat();
newLng = lastValidCenter.lng();
if(center.lng() > boundLimits.minLng && center.lng() < boundLimits.maxLng){
newLng = center.lng();
}
if(center.lat() > boundLimits.minLat && center.lat() < boundLimits.maxLat){
newLat = center.lat();
}
map.panTo(new google.maps.LatLng(newLat, newLng));
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"/>
</body>
</html>
限制缩放级别也很重要,但您似乎已经在这样做了
因此,您可能希望尝试以下示例:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps JavaScript API v3 Example: Limit Panning</title>
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false"></script>
</head>
<body>
<div id="map" style="width: 400px; height: 300px;"></div>
<script type="text/javascript">
var minZoomLevel = 5;
var map = new google.maps.Map(document.getElementById('map'), {
zoom: minZoomLevel,
center: new google.maps.LatLng(38.50, -90.50),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
// Bounds for North America
var allowedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(28.70, -127.50),
new google.maps.LatLng(48.85, -55.90));
// Listen for the dragend event
google.maps.event.addListener(map, 'dragend', function() {
if (allowedBounds.contains(map.getCenter())) return;
// Out of bounds - Move the map back within the bounds
var c = map.getCenter(),
x = c.lng(),
y = c.lat(),
maxX = allowedBounds.getNorthEast().lng(),
maxY = allowedBounds.getNorthEast().lat(),
minX = allowedBounds.getSouthWest().lng(),
minY = allowedBounds.getSouthWest().lat();
if (x < minX) x = minX;
if (x > maxX) x = maxX;
if (y < minY) y = minY;
if (y > maxY) y = maxY;
map.setCenter(new google.maps.LatLng(y, x));
});
// Limit the zoom level
google.maps.event.addListener(map, 'zoom_changed', function() {
if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel);
});
</script>
</body>
</html>
谷歌地图JavaScript API v3示例:限制平移
var minZoomLevel=5;
var map=new google.maps.map(document.getElementById('map'){
zoom:minZoomLevel,
中心:新google.maps.LatLng(38.50,-90.50),
mapTypeId:google.maps.mapTypeId.ROADMAP
});
//前往北美的边界
var allowedBounds=new google.maps.LatLngBounds(
新google.maps.LatLng(28.70,-127.50),
新google.maps.LatLng(48.85,-55.90));
//收听dragend事件
google.maps.event.addListener(映射'dragend',函数(){
if(allowedBounds.contains(map.getCenter())返回;
//超出边界-将地图移回边界内
var c=map.getCenter(),
x=c.lng(),
y=c.lat(),
maxX=allowedBounds.getNorthEast().lng(),
maxY=allowedBounds.getNorthEast().lat(),
minX=allowedBounds.getSouthWest().lng(),
minY=allowedBounds.getSouthWest().lat();
如果(xmaxX)x=maxX;
如果(ymaxY)y=maxY;
map.setCenter(新的google.maps.LatLng(y,x));
});
//限制缩放级别
google.maps.event.addListener(映射'zoom_changed',函数(){
if(map.getZoom()
以上示例的屏幕截图。在这种情况下,用户将无法再向南或向远东拖动:
这里是一个很好的扩展,它将通过侦听dragstart事件将地图中心重置为最后一个有效位置
// Limit panning
var lastCenter = map.getCenter();
google.maps.event.addListener(map, 'dragstart', function() {
lastCenter = map.getCenter();
});
google.maps.event.addListener(map, 'dragend', function() {
if(allowedBounds.contains(map.getCenter())) return;
map.setCenter(lastCenter);
});
我想我参加聚会有点晚了,但因为这正是我刚才需要的,而且我在这方面有所改进,所以我想我还是会发布一个答案 有了和的答案,用户仍然可以使用平移控件(如果已激活)离开所需区域。@Yauhen.F在评论中提到的东西 因此,我没有使用dragend事件,而是使用center\u changed事件。在拖动过程中以及每次有人使用平移控件时,都会连续触发该命令
// bounds of the desired area
var allowedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(70.33956792419954, 178.01171875),
new google.maps.LatLng(83.86483689701898, -88.033203125)
);
var lastValidCenter = map.getCenter();
google.maps.event.addListener(map, 'center_changed', function() {
if (allowedBounds.contains(map.getCenter())) {
// still within valid bounds, so save the last valid position
lastValidCenter = map.getCenter();
return;
}
// not valid anymore => return to last valid position
map.panTo(lastValidCenter);
});
通过在拖动过程中连续保存最后一个有效位置,移动将在超出边界时停止,而不是在拖动结束后返回。
……在这个问题上也有一些很好的建议。我必须解决的问题是,我希望在页面加载时设置一个边界,而不是手动设置边界和检查中心包容,然后在放大时允许拖动到边缘
所以我在地图加载上设置了一次平移边界。
然后检查贴图是否仍处于最大缩放,如果是,则返回初始中心。
如果放大,我希望平移到初始边界的边缘,而不仅仅是检查是否包含中心,因为这样会将允许的平移扩展到视口的一半
不幸的是,虽然这可以完成任务,并且在缓慢平移时效果很好,但如果您快速平移,则有点不稳定
如果你对如何避免这种情况有什么建议,我将不胜感激
map = new google.maps.Map( // defaults
document.getElementById("map22"),
{
disableDefaultUI : true,
zoomControl : true,
zoom : 7,
minZoom : 7,
maxZoom : 10,
center : new google.maps.LatLng(
64.99473104134819,
-19.22332763671875
),
mapTypeId : google.maps.MapTypeId.ROADMAP
}
);
function borders(){
return {
maxLat : map.getBounds().getNorthEast().lat(),
maxLng : map.getBounds().getNorthEast().lng(),
minLat : map.getBounds().getSouthWest().lat(),
minLng : map.getBounds().getSouthWest().lng(),
center : map.getCenter()
}
}
google.maps.event.addListenerOnce(map,'idle',function() {
limit = borders();
});
google.maps.event.addListener(map,'drag',function() {
if(map.getZoom() == 7) return map.setCenter(limit.center);
current = borders();
if( current.maxLng < limit.maxLng && current.minLng > limit.minLng ) activeCenterLng = current.center.lng();
if( current.maxLat < limit.maxLat && current.minLat > limit.minLat ) activeCenterLat = current.center.lat();
map.setCenter(
new google.maps.LatLng(
activeCenterLat,
activeCenterLng
)
);
});
map=new google.maps.map(//默认值)
document.getElementById(“map22”),
{
disableDefaultUI:true,
动物控制:对,
缩放:7,
minZoom:7,
最大缩放:10,
中心:新google.maps.LatLng(
64.99473104134819,
-19.22332763671875
),
mapTypeId:google.maps.mapTypeId.ROADMAP
}
);
函数边界(){
返回{
maxLat:map.getBounds().getNorthEast().lat(),
maxLng:map.getBounds().getNorthEast().lng(),
minLat:map.getBounds().getSouthWest().lat(),
minLng:map.getBounds().getSouthWest().lng(),
中心:map.getCenter()
}
}
google.maps.event.addListenerOnce(map,'idle',function()){
限制=边界();
});
google.maps.event.addListener(映射,'drag',函数(){
if(map.getZoom()==7)返回map.setCenter(limit.center);
当前=边界();
如果(current.maxLnglimit.minLng)activeCenterLng=current.center.lng();
如果(current.maxLatlimit.minLat)activeCenterLat=current.center.lat();
地图设置中心(
新google.maps.LatLng(
activeCenterLat,
activeCenterLng
)
);
});
当我使用拖拽或拖拽或其他方式时,地图会跳回允许的边界,而不是简单地限制溢出的移动。只需将事件更改为“中心更改”,以防止它像那样四处跳跃
修改的JSFIDLE:
编辑:不确定为什么小提琴不会产生堆栈溢出,但它应该产生,因为setCenter将再次更改呼叫中心。。小心点我试过HenningJ的答案,直到地图的中心在b的一个角落,地图才停止平移
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map-canvas { height: 100% }
</style>
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false"></script>
</script>
<script type="text/javascript">
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(28.70, -127.50),
zoom: 4,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
// bounds of the desired area
var allowedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(28.70, -127.50),
new google.maps.LatLng(48.85, -55.90)
);
var boundLimits = {
maxLat : allowedBounds.getNorthEast().lat(),
maxLng : allowedBounds.getNorthEast().lng(),
minLat : allowedBounds.getSouthWest().lat(),
minLng : allowedBounds.getSouthWest().lng()
};
var lastValidCenter = map.getCenter();
var newLat, newLng;
google.maps.event.addListener(map, 'center_changed', function() {
center = map.getCenter();
if (allowedBounds.contains(center)) {
// still within valid bounds, so save the last valid position
lastValidCenter = map.getCenter();
return;
}
newLat = lastValidCenter.lat();
newLng = lastValidCenter.lng();
if(center.lng() > boundLimits.minLng && center.lng() < boundLimits.maxLng){
newLng = center.lng();
}
if(center.lat() > boundLimits.minLat && center.lat() < boundLimits.maxLat){
newLat = center.lat();
}
map.panTo(new google.maps.LatLng(newLat, newLng));
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"/>
</body>
</html>
var latlng = new google.maps.LatLng(18.283078,84.047556);
var myOptions = {
zoom: 12,
center: latlng,
zoomControl: false,
mapTypeId: google.maps.MapTypeId.ROADMAP,
scrollwheel: false,
navigationControl: false,
mapTypeControl: false,
scaleControl: false,
draggable: false,
disableDoubleClickZoom: true,
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var mapObject = plugin_map.gmap3('get');
var allowedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(41.3957556, -88.4345472),
new google.maps.LatLng(49.4010417, -78.4286389)
);
google.maps.event.addListener(mapObject, 'center_changed', function() {
if (allowedBounds.contains(mapObject.getCenter())) {
// still within valid bounds, so save the last valid position
return;
}
// not valid anymore => return to last valid position
var c = mapObject.getCenter(),
x = c.lng(),
y = c.lat(),
maxX = allowedBounds.getNorthEast().lng(),
maxY = allowedBounds.getNorthEast().lat(),
minX = allowedBounds.getSouthWest().lng(),
minY = allowedBounds.getSouthWest().lat();
if (x < minX) x = minX;
if (x > maxX) x = maxX;
if (y < minY) y = minY;
if (y > maxY) y = maxY;
//mapObject.setCenter(new google.maps.LatLng(y, x));
mapObject.panTo(new google.maps.LatLng(y, x));
});
// bounds of the desired area
var allowedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(70.33956792419954, 178.01171875),
new google.maps.LatLng(83.86483689701898, -88.033203125)
);
var lastValidCenter = map.getCenter();
google.maps.event.addListener(map, 'center_changed', function() {
var mapBounds = map.getBounds();
var mapNe = mapBounds.getNorthEast();
var mapSw = mapBounds.getSouthWest();
var center = map.getCenter();
if( allowedBounds.contains(mapNe) && allowedBounds.contains(mapSw) ) {
//the user is scrolling within the bounds.
lastValidCenter = center;
return;
}
//the user has scrolled beyond the edge.
var mapWidth = mapNe.lng() - mapSw.lng();
var mapHeight = mapNe.lat() - mapSw.lat();
var x = center.lng();
var y = center.lat();
var maxX = allowedBounds.getNorthEast().lng();
var maxY = allowedBounds.getNorthEast().lat();
var minX = allowedBounds.getSouthWest().lng();
var minY = allowedBounds.getSouthWest().lat();
//shift the min and max dimensions by 1/2 of the screen size, so the bounds remain at the edge of the screen
maxX -= (mapWidth / 2);
minX += (mapWidth / 2);
maxY -= (mapHeight / 2);
minY += (mapHeight / 2);
if (x < minX) {
x = minX;
}
if (x > maxX) {
x = maxX;
}
if (y < minY){
y = minY;
}
if (y > maxY){
y = maxY;
}
map.panTo(new google.maps.LatLng(y, x));
});
var lastValidCenter;
var minZoomLevel = 2;
setOutOfBoundsListener();
function setOutOfBoundsListener() {
google.maps.event.addListener(map, 'dragend', function () {
checkLatitude(map);
});
google.maps.event.addListener(map, 'idle', function () {
checkLatitude(map);
});
google.maps.event.addListener(map, 'zoom_changed', function () {
checkLatitude(map);
});
};
function checkLatitude(map) {
if (this.minZoomLevel) {
if (map.getZoom() < minZoomLevel) {
map.setZoom(parseInt(minZoomLevel));
}
}
var bounds = map.getBounds();
var sLat = map.getBounds().getSouthWest().lat();
var nLat = map.getBounds().getNorthEast().lat();
if (sLat < -85 || nLat > 85) {
//the map has gone beyone the world's max or min latitude - gray areas are visible
//return to a valid position
if (this.lastValidCenter) {
map.setCenter(this.lastValidCenter);
}
}
else {
this.lastValidCenter = map.getCenter();
}
}
<body>
<div id="map"></div>
<script>
var map;
var NEW_ZEALAND_BOUNDS = {
north: -34.36,
south: -47.35,
west: 166.28,
east: -175.81,
};
var AUCKLAND = {lat: -37.06, lng: 174.58};
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: AUCKLAND,
restriction: {
latLngBounds: NEW_ZEALAND_BOUNDS,
strictBounds: false,
},
zoom: 7,
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
</body>
map = new google.maps.Map(document.getElementById('map'), {
restriction: {
latLngBounds: {
north: 85,
south: -85,
west: -180,
east: 180
},
strictBounds: true,
},
zoom: 7,
});