everyone!
How to utilize google map MarkerCluster to catch Polygon rather than Marker ?
My program has about 20,000 markers on Google Map, and it becomes very slow when the data is loading into the map. Then I use JS code to draw one polygon as the replacement of marker. It would run faster. Maybe the PNG image loading for markers exercises negative influence on speed.
Finally, I read this article
http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/docs/examples.html
The function 'MarkerCluster' is great. However, it can be only used on the aspect of Google Marker.
var markerClusterer = new MarkerClusterer(map, **markerArray**)
So is there some solution for putting polygon into this cluster mechanism ?
Any help would be greatly appreciated !
I tentatively made an example.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/src/markerclusterer.js"></script>
<style>
html, body, #map_canvas {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}
</style>
<script type='text/javascript'>
var mapCanvas;
function initalize() {
// Creating a map
var mapDiv = document.getElementById("map_canvas");
mapCanvas = new google.maps.Map(mapDiv, {
mapTypeId : google.maps.MapTypeId.ROADMAP
});
// Generate bunch of path data
var sw = new google.maps.LatLng(-19.448292, -152.012329);
var ne = new google.maps.LatLng(76.150236, 58.925171);
var bounds = new google.maps.LatLngBounds(sw, ne);
mapCanvas.setCenter(bounds.getCenter());
mapCanvas.setZoom(3);
var baseLat, baseLng, category, json = [], path;
for (var i = 0; i < 100; i++) {
baseLat = Math.random() * (ne.lat() - sw.lat()) + sw.lat();
baseLng = Math.random() * (ne.lng() - sw.lng()) + sw.lng();
path = [
new google.maps.LatLng(baseLat, baseLng),
new google.maps.LatLng(baseLat + 1, baseLng + 1),
new google.maps.LatLng(baseLat, baseLng + 2)
];
json.push(path);
}
var bounds, polyList = [];
for (var i = 0, length = json.length; i < length; i++) {
var polyline = createPolygon(json[i]);
polyList.push(polyline);
}
var clusterer = new MarkerClusterer(mapCanvas, polyList);
}
function createPolygon(path) {
var polygon = new google.maps.Polygon({
path : path,
strokeOpacity : 1,
strokeColor : "red"
});
var lastPath = null,
lastCenter = null;
polygon.getPosition = function() {
var path = this.getPath();
if (lastPath == path) {
return lastCenter;
}
lastPath = path;
var bounds = new google.maps.LatLngBounds();
path.forEach(function(latlng, i) {
bounds.extend(latlng);
});
lastCenter = bounds.getCenter()
return lastCenter;
};
return polygon;
}
google.maps.event.addDomListener(window, "load", initalize);
</script>
</head>
<body>
<div id="map_canvas"></div>
</body>
</html>
Related
So I have created a heat map in Fusion Tables, obtained a API key and copied the code into the link in Google Earth Network Link add. I did not get the resulting heat map to populate in Google Earth. I've set the sharing to Public and Unlisted but neither bears any fruit. Can anyone tell me what steps I am missing to get the heat map to populate in Google Earth?
Here is my obtained code (XXX'd out my API key)
<!DOCTYPE html>
<html>
<head>
<meta name="viewport"></meta>
<title>Copy of Heat Map - Google Fusion Tables</title>
<style type="text/css">
html, body, #googft-mapCanvas {
height: 300px;
margin: 0;
padding: 0;
width: 500px;
}
</style>
<script type="text/javascript" src="https://maps.google.com/maps/api/js?v=3&libraries=visualization"></script>
<script type="text/javascript">
if (window.location.protocol == "file:") {
alert('This script only works when loaded from a web server,' +
' not from a file on your computer.');
}
function ftOnLoadClientApi() {
gapi.client.setApiKey('XxxXxxXxxxXx');
}
</script>
<script type="text/javascript" src="https://apis.google.com/js/client.js?onload=ftOnLoadClientApi">
</script>
<script type="text/javascript">
var map;
function loadApi() {
gapi.client.load('fusiontables', 'v1', initialize);
}
function initialize() {
var isMobile = (navigator.userAgent.toLowerCase().indexOf('android') > -1) ||
(navigator.userAgent.match(/(iPod|iPhone|iPad|BlackBerry|Windows Phone|iemobile)/));
if (isMobile) {
var viewport = document.querySelector("meta[name=viewport]");
viewport.setAttribute('content', 'initial-scale=1.0, user-scalable=no');
}
var mapDiv = document.getElementById('googft-mapCanvas');
mapDiv.style.width = isMobile ? '100%' : '500px';
mapDiv.style.height = isMobile ? '100%' : '300px';
map = new google.maps.Map(mapDiv, {
center: new google.maps.LatLng(28.070831120253633, -82.434892289917),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var query = 'select col2, col1 from 1-6pqmYvsmKGwt9IZcpIxFUmyYwmumoMAtMrE8pMe limit 1000';
var request = gapi.client.fusiontables.query.sqlGet({ sql: query });
request.execute(function(response) {
onDataFetched(response);
});
}
function onDataFetched(response) {
if (response.error) {
alert('Unable to fetch data. ' + response.error.message +
' (' + response.error.code + ')');
} else {
drawHeatmap(extractLocations(response.rows));
}
}
function extractLocations(rows) {
var locations = [];
for (var i = 0; i < rows.length; ++i) {
var row = rows[i];
if (row[0]) {
var lat = row[0];
var lng = row[1];
if (lat && lng && !isNaN(lat) && !isNaN(lng)) {
var latLng = new google.maps.LatLng(lat, lng);
locations.push(latLng);
}
}
}
return locations;
}
function drawHeatmap(locations) {
var heatmap = new google.maps.visualization.HeatmapLayer({
dissipating: true,
gradient: [
'rgba(102,255,0,0)',
'rgba(147,255,0,1)',
'rgba(193,255,0,1)',
'rgba(238,255,0,1)',
'rgba(244,227,0,1)',
'rgba(244,227,0,1)',
'rgba(249,198,0,1)',
'rgba(255,170,0,1)',
'rgba(255,113,0,1)',
'rgba(255,57,0,1)',
'rgba(255,0,0,1)'
],
opacity: 0.49,
radius: 20,
data: locations
});
heatmap.setMap(map);
}
google.maps.event.addDomListener(window, 'load', loadApi);
</script>
</head>
<body>
<div id="googft-mapCanvas"></div>
</body>
</html>
I have a map with about 20 markers on it representing the birthplaces of ancestors. The markers are created from XML. I want the later generations at the front and the earlier generations behind, but Google Maps defaults to the most southerly markers in front. In its simplest form the code looks like this:
<!DOCTYPE html >
<head>
<link rel="stylesheet" href="css/style.css" type="text/css">
<script src="https://maps.googleapis.com/maps/api/js?key=MYKEY" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
var map = null;
var thisLatLng = {lat: 51, lng: -3.5};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: thisLatLng,
zoom: 9,
mapTypeId: 'roadmap'
});
// Change this depending on the name of your PHP file
downloadUrl("php-to-xml.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("person");
var gender = markers[i].getAttribute("gender");
var z_index = markers[i].getAttribute("z_index");
var lat = parseFloat(markers[i].getAttribute("lat"));
var lng = parseFloat(markers[i].getAttribute("lng"));
var point = new google.maps.LatLng(lat,lng);
var comment = markers[i].getAttribute("comment");
var colour = markers[i].getAttribute("colour");
var html = "<b>" + name + "</b> <br/>" + comment;
var icon = "images/" + gender + "_" + colour + ".png";
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon,
optimized: false,
zIndex: z_index
});
}
});
}
function downloadUrl(url, callback) {
var request = window.ActiveXObject ?
new ActiveXObject('Microsoft.XMLHTTP') :
new XMLHttpRequest;
request.onreadystatechange = function() {
if (request.readyState == 4) {
request.onreadystatechange = doNothing;
callback(request, request.status);
}
};
request.open('GET', url, true);
request.send(null);
}
function doNothing() {}
//]]>
</script>
</head>
<body onload="load()">
<div id="map"></div>
</body>
</html>
Values of z-index vary from 100 to 200 in increments of 10, depending on the generation. However I've also tried making them 9100 to 9200, and various other things.
I've seen it suggested that the icons need to have a CSS "position" in order to make z-index work. However I've tried
#map img[src^='/myfamilyroots/images'] {position:relative!important;}
and many variations on that theme without success.
This driving me mad. As far as I can see I have followed the Google Maps reference guide, yet nothing I do will change the way the markers are displayed.
zIndex is expected to be of type Number, but getAttribute() always returns strings.
Convert the string into a Number before you assign the zIndex
var z_index = Number(markers[i].getAttribute("z_index"));
To reproduce, download CefSharp from here:
https://github.com/cefsharp/CefSharp
And run the CefSharp.WinForms.Example
Now run my fiddle on your browser and the CefSharp browser:
http://jsfiddle.net/bjmL9/
I added an alert displaying full address data on click (street_number, route, neighborhood, locality, administrative_area_level_2, administrative_area_level_1, country, postal_code).
Compare the data displayed on your browser to the one on the CefSharp browser.
The problem:
In my browser, the locality shows as "Culiacán Rosales", but on the Cef browser it gets truncated to "Culiacán". The country behaves weird too with Cef displaying "Mexico" instead of "México" (unaccented).
I am on the edge of quitting cef cuz i can't get a google match on this problem and no idea how to fix it...
This is the code of the fiddle since it won't last for ever:
<!DOCTYPE html>
<html>
<head>
<title>Google Map</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
</style>
<link href="MapStyle.css" rel="stylesheet" type="text/css" media="all"/>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&libraries=places"></script>
<script>
var map;
var geocoder;
function initialize() {
var placeMarkers = [];
geocoder = new google.maps.Geocoder();
var aquamiller = new google.maps.LatLng(
24.832956,
-107.389775);
var mapOptions = {
zoom: 16,
center: aquamiller,
};
map = new google.maps.Map(
document.getElementById('map-canvas'),
mapOptions);
createSearchBar(map, placeMarkers);
google.maps.event.addListener(
map,
'click',
function(e) {
getAddress(e.latLng, function(address) {
alert(
address.street_number + ', ' +
address.route + ', ' +
address.neighborhood + ', ' +
address.locality + ', ' +
address.administrative_area_level_2 + ', ' +
address.administrative_area_level_1 + ', ' +
address.country + ', ' +
address.postal_code);
});
});
}
function getAddress(latLng, callBack)
{
geocoder.geocode({'latLng': latLng}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[0]) {
var address = {};
var components = results[0].address_components;
for (var i = 0 ; i< components.length ; i++) {
address[components[i].types[0]] = components[i].long_name;
}
callBack(address);
}
else {
alert('No results found');
}
}
else {
alert('Geocoder failed due to: ' + status);
}
});
}
function createSearchBar(map, markers)
{
var input = /** #type {HTMLInputElement} */(document.getElementById('pac-input'));
map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);
var searchBox = new google.maps.places.SearchBox(/** #type {HTMLInputElement} */(input));
google.maps.event.addListener(searchBox, 'places_changed', function() {
var places = searchBox.getPlaces();
console.log(places);
for (var i = 0, marker; marker = markers[i]; i++) {
marker.setMap(null);
}
markers = [];
var bounds = new google.maps.LatLngBounds();
for (var i = 0, place; place = places[i]; i++) {
var image = {
url: place.icon,
size: new google.maps.Size(71, 71),
origin: new google.maps.Point(0, 0),
anchor: new google.maps.Point(17, 34),
scaledSize: new google.maps.Size(25, 25)
};
// Create a marker for each place.
var marker = new google.maps.Marker({
map: map,
icon: image,
title: place.name,
position: place.geometry.location
});
markers.push(marker);
bounds.extend(place.geometry.location);
console.log(place.geometry.location);
}
map.fitBounds(bounds);
map.setZoom(16);
});
google.maps.event.addListener(map, 'bounds_changed', function() {
var bounds = map.getBounds();
searchBox.setBounds(bounds);
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
<style>
#target {
width: 345px;
}
</style>
</head>
<body>
<input id="pac-input" class="controls" type="text" placeholder="Search Box">
<div id="map-canvas"></div>
</body>
</html>
Hey wait once more I see the same behavior (missing " Rosales" and accent in "México") with both my standard Chrome 35 and IE 10.
So, maybe it's related to a missing CEF language pack: https://github.com/cefsharp/cef-binary/tree/cef_binary_1.1364.1123/Release/locales .. the NuGet you use probably only has en-US.pak
... Tested a bit more with your fiddle example. Dropping es.pak in my install didn't help. BUT I see similar if I search for "Sønderborg, Denmark" in the search box in the map. (At some locations there it says "S**o**nderborg", no "ø" ) So are you sure its browser related and not just the google API?
update Asking with language=es as in:
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&language=es&libraries=places"></script>
Alters the response from googles API. Currently verified using my iPad and your fiddle!
I want to view and remove markers on map depending on user click over location type..
I am using this code to remove markers
1- Define markersArray as global array
var markersArray =new Array();
2- Define clearOverlays function
function clearOverlays() {
if ( markersArray && markersArray.length) {
google.maps.Map.prototype.clearOverlays = function() {
for (var i = 0; i < markersArray.length; i++ ) {
markersArray[i].setMap(null);
}
}
markersArray = [];
markersArray = new Array();
markersArray.length = 0;
}
}
3- I call the function when I want to remove the markers
The problem is that: Nothing is removed from the map!
I wonder to know why!
Edit: Here where I add markers and push them into markersArray
downloadUrl("getPlacesForType/"+markerType+"/"+lang, function(data) {
var xml = data.responseXML;
var myMarkersArray = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < myMarkersArray.length; i++) {
var name = myMarkersArray[i].getAttribute("name");
var version = myMarkersArray[i].getAttribute("version");
var description = myMarkersArray[i].getAttribute("description");
var type = myMarkersArray[i].getAttribute("type");
var point = new google.maps.LatLng(
parseFloat(myMarkersArray[i].getAttribute("lat")),
parseFloat(myMarkersArray[i].getAttribute("lng")));
var html = "<b>" + name + "</b> <br/>" + description;
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point ,
icon: icon.icon,
shadow: icon.shadow
});
markersArray.push(marker);
bindInfoWindow(marker, map, infoWindow, html);
}
});
try using an array to store markers. you need to push each marker while creating it.
var markerArray=[];
var locations = [ [56.066877,21.069274], [55.279849,26.048155] ];
for (i = 0; i < locations.length; i++)
{
marker = new MarkerWithLabel({
position: new google.maps.LatLng(locations[i][0], locations[i][1]),
map: map
});
markerArray.push(marker);
} /
and for deleting markers,
function deleteMarkers() {
if (markersArray) {
for (i in markersArray) {
markersArray[i].setMap(null);
}
markersArray.length = 0;
}
}
take a look at this small example,
<!DOCTYPE html>
<html>
<head>
<title>Google Maps</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
margin: 0;
padding: 0;
height: 100%;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script>
var markersArray = [];
function initialize() {
var mapOptions = {
zoom: 4,
center: new google.maps.LatLng(-25.363882, 131.044922),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
google.maps.event.addListener(map, 'click', function (e) {
placeMarker(e.latLng, map);
});
}
function placeMarker(position, map) {
var marker = new google.maps.Marker({
position: position,
map: map
});
markersArray.push(marker);
map.panTo(position);
}
google.maps.event.addDomListener(window, 'load', initialize);
function deleteOverlays() {
if (markersArray) {
for (i in markersArray) {
markersArray[i].setMap(null);
}
markersArray.length = 0;
}
}
</script>
</head>
<body>
<input type="button" value="deletemarker" onclick="deleteOverlays()" />
<div id="map-canvas"></div>
</body>
</html>
I have a Google map (v3) on my site and I want to know what scale is my current zoom. The thing is that the user can change it's zoom so the scale can change.
The information I need is the actual width in kilometers of my map. I know I can use Bounds... but is there any other way? I really don't want to use Bounds.
Thank you!
So you can call map.getBounds(). Then you can use functions on the google.maps.geometry.spherical class like computeDistanceBetween or computeLength. Something like this I think should give you what you need:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<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.googleapis.com/maps/api/js?sensor=false&libraries=geometry"></script>
<script type="text/javascript">
function initialize() {
var homeLatlng = new google.maps.LatLng(51.476706,0); // London
var myOptions = {
zoom: 15,
center: homeLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
google.maps.event.addListener(map, 'bounds_changed', function() {
// find out the map's bounds:
var bounds = map.getBounds();
// from that, get the coordinates for the NE and SW corners
var NE = bounds.getNorthEast();
var SW = bounds.getSouthWest();
// from that, figure out the latitudes and the longitudes
var lat1 = NE.lat();
var lat2 = SW.lat();
var lng1 = NE.lng();
var lng2 = SW.lng();
// construct new LatLngs using the coordinates for the horizontal distance between lng1 and lng2
var horizontalLatLng1 = new google.maps.LatLng(lat1,lng1);
var horizontalLatLng2 = new google.maps.LatLng(lat1,lng2);
// construct new LatLngs using the coordinates for the vertical distance between lat1 and lat2
var verticalLatLng1 = new google.maps.LatLng(lat1,lng1);
var verticalLatLng2 = new google.maps.LatLng(lat2,lng1);
// work out the distance horizontally
var horizontal = google.maps.geometry.spherical.computeDistanceBetween(horizontalLatLng1,horizontalLatLng2);
// work out the distance vertically
var vertical = google.maps.geometry.spherical.computeDistanceBetween(verticalLatLng1,verticalLatLng2);
// round to kilometres to 1dp
var horizontalkm = convertMetresToKm(horizontal);
var verticalkm = convertMetresToKm(vertical);
alert(horizontalkm + ' km horizontal, ' + verticalkm + ' km vertical');
});
}
function convertMetresToKm(metres) {
return Math.round(metres / 1000 *10)/10; // distance in km rounded to 1dp
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map_canvas"></div>
</body>
</html>