Develop Reference

Is a point contained in a-little-bit-more than the map bounds?

It's easy to check if a point (e. g. a marker) is inside the map's current bounds:
map.getBounds().contains(marker.getPosition())
Is there a natural way to check if a point is inside the map's current bounds enlarged by 10% on each side ?

One option (you can also expand the bounds along the diagonals):
capture the bounds when it is first set using google.maps.event.addDomListenerOnce on the "bounds_changed" event.
expand it by 10% in each direction (N, S, E, W).
create a new google.maps.LatLngBounds object
use the new "expanded" bounds for the .contains check.
google.maps.event.addListenerOnce(map, 'bounds_changed', function() {
var initBounds = map.getBounds();
var initRect = new google.maps.Rectangle({
map: map,
bounds: initBounds,
fillOpacity: 0.4,
fillColor: 'red'
});
// extend bounds
var newN = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getNorthEast().lat(), initBounds.getCenter().lng())), 0).lat();
var newS = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getSouthWest().lat(), initBounds.getCenter().lng())), 180).lat();
var newE = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getCenter().lat(), initBounds.getNorthEast().lng())), 90).lng();
var newW = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getCenter().lat(), initBounds.getSouthWest().lng())), -90).lng();
var expandedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(newS, newW),
new google.maps.LatLng(newN, newE)
);
var expRect = new google.maps.Rectangle({
map: map,
bounds: expandedBounds,
fillOpacity: 0.4,
fillColor: 'blue'
});
});
proof of concept fiddle
code snippet:
var geocoder;
var map;
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(37.4419, -122.1419),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
google.maps.event.addListenerOnce(map, 'bounds_changed', function() {
var initBounds = map.getBounds();
var initRect = new google.maps.Rectangle({
map: map,
bounds: initBounds,
fillOpacity: 0.4,
fillColor: 'red'
});
// extend bounds
var newN = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getNorthEast().lat(), initBounds.getCenter().lng())), 0).lat();
var newS = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getSouthWest().lat(), initBounds.getCenter().lng())), 180).lat();
var newE = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getCenter().lat(), initBounds.getNorthEast().lng())), 90).lng();
var newW = google.maps.geometry.spherical.computeOffset(initBounds.getCenter(),
1.1 * google.maps.geometry.spherical.computeDistanceBetween(initBounds.getCenter(), new google.maps.LatLng(initBounds.getCenter().lat(), initBounds.getSouthWest().lng())), -90).lng();
var expandedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(newS, newW),
new google.maps.LatLng(newN, newE)
);
var expRect = new google.maps.Rectangle({
map: map,
bounds: expandedBounds,
fillOpacity: 0.4,
fillColor: 'blue'
});
});
}
google.maps.event.addDomListener(window, "load", initialize);
html,
body,
#map_canvas {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
<div id="map_canvas"></div>

I finally used:
var bnd = map.getBounds();
var bnd2 = new google.maps.LatLngBounds(
new google.maps.LatLng(1.1 * bnd.H.H - 0.1 * bnd.H.j, 1.1 * bnd.j.j - 0.1 * bnd.j.H),
new google.maps.LatLng(1.1 * bnd.H.j - 0.1 * bnd.H.H, 1.1 * bnd.j.H - 0.1 * bnd.j.j)
);
bnd2.contains(marker.getPosition())

Drawing a path as an object moves on a map

I have this marker that moves along a google map http://jsfiddle.net/t43kaeyr/ but i need it to draw its path on the map as it moves.
This is the javascript that creates the map
var map,marker;
var startPos = [42.42679066670903, -83.29210638999939];
var speed = 150; // km/h
var delay = 100;
// If you set the delay below 1000ms and you go to another tab,
// the setTimeout function will wait to be the active tab again
// before running the code.
// See documentation :
// https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/setTimeout#Inactive_tabs
function animateMarker(marker, coords, km_h)
{
var target = 0;
var km_h = km_h || 50;
coords.push([startPos[0], startPos[1]]);
function goToPoint()
{
var lat = marker.position.lat();
var lng = marker.position.lng();
var step = (km_h * 1000 * delay) / 3600000; // in meters
var dest = new google.maps.LatLng(
coords[target][0], coords[target][1]);
var distance =
google.maps.geometry.spherical.computeDistanceBetween(
dest, marker.position); // in meters
var numStep = distance / step;
var i = 0;
var deltaLat = (coords[target][0] - lat) / numStep;
var deltaLng = (coords[target][1] - lng) / numStep;
function moveMarker()
{
lat += deltaLat;
lng += deltaLng;
i += step;
if (i < distance)
{
marker.setPosition(new google.maps.LatLng(lat, lng));
setTimeout(moveMarker, delay);
}
else
{ marker.setPosition(dest);
target++;
if (target == coords.length){ target = 0; }
setTimeout(goToPoint, delay);
}
}
moveMarker();
}
goToPoint();
}
function initialize()
{
var myOptions = {
zoom: 16,
center: new google.maps.LatLng(42.425175091823974, -83.2943058013916),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
marker = new google.maps.Marker({
position: new google.maps.LatLng(startPos[0], startPos[1]),
icon: 'assets/images/c.png',
map: map
});
google.maps.event.addListenerOnce(map, 'idle', function()
{
animateMarker(marker, [
// The coordinates of each point you want the marker to go to.
// You don't need to specify the starting position again.
[42.42666395645802, -83.29694509506226],
[42.42300508749226, -83.29679489135742],
[42.42304468678425, -83.29434871673584],
[42.424882066428424, -83.2944130897522],
[42.42495334300206, -83.29203128814697]
], speed);
});
}
initialize();
I tried drawing the path and the path is drawn correctly but the object does not move any more. This is the code
var map,marker;
var startPos = [42.42679066670903, -83.29210638999939];
var speed = 150; // km/h
var delay = 100;
// If you set the delay below 1000ms and you go to another tab,
// the setTimeout function will wait to be the active tab again
// before running the code.
// See documentation :
// https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/setTimeout#Inactive_tabs
function animateMarker(marker, coords, km_h)
{
var target = 0;
var km_h = km_h || 50;
coords.push([startPos[0], startPos[1]]);
function goToPoint()
{
var lat = marker.position.lat();
var lng = marker.position.lng();
var step = (km_h * 1000 * delay) / 3600000; // in meters
var dest = new google.maps.LatLng(
coords[target][0], coords[target][1]);
var distance =
google.maps.geometry.spherical.computeDistanceBetween(
dest, marker.position); // in meters
var numStep = distance / step;
var i = 0;
var deltaLat = (coords[target][0] - lat) / numStep;
var deltaLng = (coords[target][1] - lng) / numStep;
function moveMarker()
{
lat += deltaLat;
lng += deltaLng;
i += step;
if (i < distance)
{
marker.setPosition(new google.maps.LatLng(lat, lng));
setTimeout(moveMarker, delay);
}
else
{ marker.setPosition(dest);
target++;
if (target == coords.length){ target = 0; }
setTimeout(goToPoint, delay);
}
}
moveMarker();
}
goToPoint();
}
function initialize()
{
var myOptions = {
zoom: 16,
center: new google.maps.LatLng(42.425175091823974, -83.2943058013916),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
marker = new google.maps.Marker({
position: new google.maps.LatLng(startPos[0], startPos[1]),
icon: 'assets/images/c.png',
map: map
});
var flightPlanCoordinates = [
{lat: 42.42666395645802, lng: -83.29694509506226},
{lat: 42.42300508749226, lng: -83.29679489135742},
{lat: 42.42304468678425, lng: -83.29434871673584},
{lat: 42.424882066428424, lng: -83.2944130897522},
{lat: 42.42495334300206, lng: -83.29203128814697}
];
google.maps.event.addListenerOnce(map, 'idle', function()
{
animateMarker(marker, [
// The coordinates of each point you want the marker to go to.
// You don't need to specify the starting position again.
flightPlanCoordinates
], speed);
});
var flightPath = new google.maps.Polyline({
path: flightPlanCoordinates,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
flightPath.setMap(map);
}
initialize();
How can i make the marker to draw its path as it moves on the map?.

Maybe you want create a Polyline with a Line with multiple points, which represents each position of the marker:
provide a global variable:
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: {lat: 0, lng: -180},
mapTypeId: google.maps.MapTypeId.TERRAIN
});
var polylineCoords = [];
var path = new google.maps.Polyline({
path: polylineCoords,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
path.setMap(map);
//To add a Point on the polyline call
function addCoord(lat, lng) {
var point = new google.maps.LatLng(lat, lng);
var coords = path.getPath();
coords.push(point);
}
JSFiddle

Google Maps V3 - mouse position wrong

I have implemented Google Maps API V3 on a page and for some reason the position of the mouse is off.
In the image, my mouse is in the red circle but the map thinks it's where the blue circle is.
This issue also affects the dragable points when using the directions service.
I build the map using the following:
var center = new google.maps.LatLng(53.42263, -7.9541);
var latlngbounds = new google.maps.LatLngBounds( );
var map = new google.maps.Map(document.getElementById('map_canvas'), {
center: new google.maps.LatLng( 53.42263, -7.9541 ),
zoom: 7,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var clusters = [];
var oms = new OverlappingMarkerSpiderfier(map);
var iw = new google.maps.InfoWindow();
var spiderIcon = new google.maps.MarkerImage (
'http://www.irishcottageholidays.com/images/cottage1.png',
new google.maps.Size(32,32),
new google.maps.Point(0,0),
new google.maps.Point(16,20)
)
oms.addListener('click', function(marker, event) {
load_content(map, marker, iw, marker.id)
});
oms.addListener('spiderfy', function(markers) {
for(var i = 0; i < markers.length; i ++) {
markers[i].setIcon(spiderIcon);
}
iw.close();
});
for (var i = 0; i < data.locations.length; i++) {
var dataPhoto = data.locations[i];
var latLng = new google.maps.LatLng(dataPhoto.latitude,dataPhoto.longitude);
latlngbounds.extend( latLng );
var marker = new google.maps.Marker({
position: latLng,
icon: 'http://www.irishcottageholidays.com/images/cottage1.png',
map: map,
id: dataPhoto.mID,
title: dataPhoto.name
});
clusters.push(marker);
oms.addMarker(marker);
}
var mcStyles = [
{
textColor: 'deeppink',
textSize: 18,
anchor: [17,0],
url: '/assets/cms/images/cottage_cluster.png',
height: 50,
width: 50
}
]
var mcOptions = {
styles: mcStyles,
gridSize: 5,
maxZoom: 15
}
var markerCluster = new MarkerClusterer(map, clusters, mcOptions);
map.fitBounds( latlngbounds );

There is an issue with Firefox 39.0 and v=3.exp.
issue 8278 in the issue tracker

Creating text in the center of a marker

I've been playing with Google Map API for a few days now and it's pretty straight forward for the most part, but one thing that we need to do, I can't figure out. I've played with the labels as you can see in the example below, but I'm unable to give them to look that I have in the image below. Can someone point me to a reference so I can achieve my requirements?
If your looking for the makerwithlable.js, you can get it from here.. Its where I got it:
https://code.google.com/p/google-maps-utility-library-v3/source/browse/trunk/markerwithlabel/src/markerwithlabel.js?r=288
<!DOCTYPE html>
<html>
<head>
<script src="http://maps.googleapis.com/maps/api/js"></script>
<script src="markerwithlabel.js" type="text/javascript"></script>
<script>
{
var showOnStartInfoWindows = true;
//create locations..
var arrayAll = [];
var marker = [];
var jax = new google.maps.LatLng(30.318028, -81.674474);
var leesburg = new google.maps.LatLng(28.810750, -81.880056);
var map = null;
arrayAll[0] = {loc: jax, size: 5000, info: "Jacksonville, FL 32204"};
arrayAll[1] = {loc: leesburg, size: 1000, info: "Leesburg, FL"};
//EO create locations..
}
function initialize()
{
//center the map on Jacksonville
var mapProp = {
center:arrayAll[0].loc,
zoom:6,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
//set google's API and pass the DIV by ID.
map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
var bounds = new google.maps.LatLngBounds(leesburg, jax);
map.fitBounds(bounds);
var maxSize = 0;
for(var i = 0; i < arrayAll.length; i++)
{
if(maxSize<arrayAll[i].size)
maxSize = arrayAll[i].size;
}
for(var i = 0; i < arrayAll.length; i++)
{
var size = Math.round((arrayAll[i].size/maxSize)*100);
//create marker
marker[i] = new google.maps.Marker({
position:arrayAll[i].loc,
map: map,
title: 'Right-Click to zoom all the way in.\nLeft-Click to zoom to a state level.',
draggable: false,
raiseOnDrag: false,
labelAnchor: new google.maps.Point(22, 0),
labelClass: "googleLabel", // the CSS class for the label
labelContent: arrayAll[i].info,
icon: {
path: google.maps.SymbolPath.CIRCLE, //BACKWARD_CLOSED_ARROW
fillOpacity: 0.3,
fillColor: '#0000ff',
strokeOpacity: 1.0,
strokeColor: '#0000ff',
strokeWeight: 1.0,
scale: size, //pixels
}
});
marker[i].setMap(map);
//EO create marker
marker_onclick(marker[i]);
marker_info(marker[i]);
}
}
function marker_onclick(marker) {
google.maps.event.addListener(marker, 'dblclick', function(o) {
map.setZoom(18);
map.setCenter(marker.position);
});
google.maps.event.addListener(marker, 'click', function(o) {
map.setZoom(7);
map.setCenter(marker.position);
});
google.maps.event.addListener(marker, 'rightclick', function(o) {
alert('Could route to different URL:\n' + marker.position);
});
}
function marker_info(marker) {
//create popup notice..
var infowindow = new google.maps.InfoWindow({
content:marker.labelContent
});
if(showOnStartInfoWindows)
infowindow.open(map, marker);
google.maps.event.addListener(marker, 'mouseover', function (o) {
//alert('over');
infowindow.open(map, marker);
});
google.maps.event.addListener(marker, 'mouseout', function (o) {
//alert('out');
infowindow.close(map, marker);
});
//EO create popup notice..
}
{
google.maps.event.addDomListener(window, 'load', initialize);
}
</script>
</head>
<body>
<div id="googleMap" style="width:640px;height:640px;"></div>
</body>
</html>
Example of what I'm trying to do.

Based on the value of size you may set the style(fontSize,width,height etc.) and the labelAnchor
{
var showOnStartInfoWindows = true;
//create locations..
var arrayAll = [];
var marker = [];
var jax = new google.maps.LatLng(30.318028, -81.674474);
var leesburg = new google.maps.LatLng(28.810750, -81.880056);
var map = null;
arrayAll[0] = {
loc: jax,
size: 5000,
info: "Jacksonville, FL 32204"
};
arrayAll[1] = {
loc: leesburg,
size: 1000,
info: "Leesburg, FL"
};
//EO create locations..
}
function initialize() {
//center the map on Jacksonville
var mapProp = {
center: arrayAll[0].loc,
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
//set google's API and pass the DIV by ID.
map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
var bounds = new google.maps.LatLngBounds(leesburg, jax);
map.fitBounds(bounds);
var maxSize = 0;
for (var i = 0; i < arrayAll.length; i++) {
if (maxSize < arrayAll[i].size)
maxSize = arrayAll[i].size;
}
for (var i = 0; i < arrayAll.length; i++) {
var size = Math.round((arrayAll[i].size / maxSize) * 100);
//create MarkerWithLabel
marker[i] = new MarkerWithLabel({
labelInBackground:false,
position: arrayAll[i].loc,
map: map,
title: 'Right-Click to zoom all the way in.\nLeft-Click to zoom to a state level.',
labelAnchor: new google.maps.Point((size * 1.8) / 2, (size / 3)),
labelClass: "googleLabel", // the CSS class for the label
labelStyle: {
width: (size * 1.8) + 'px',
height: (size / 1.5) + 'px',
lineHeight: (size / 1.5) + 'px',
fontSize: (size / 1.5) + 'px'
},
labelContent: arrayAll[i].size,
icon: {
path: google.maps.SymbolPath.CIRCLE,
fillOpacity: 0.6,
fillColor: 'gold',
strokeOpacity: 1.0,
strokeColor: '#0000ff',
strokeWeight: 1.0,
scale: size, //pixels
}
});
marker[i].setMap(map);
}
}
{
google.maps.event.addDomListener(window, 'load', initialize);
}
html,
body,
#googleMap {
margin: 0;
padding: 0;
height: 100%;
}
.googleLabel {
color: #000;
font-weight: bold;
text-align: center;
}
<script src="http://maps.googleapis.com/maps/api/js"></script>
<script src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerwithlabel/src/markerwithlabel.js" type="text/javascript"></script>
<div id="googleMap"></div>

Google Maps Engine API - KML Layers Obstructing New Markers Event

I am currently building out a small widget that allows someone to see a kml heat map of the united states population density then select an area on that map and drop a market on to that location. The user then enters a number and that creates a mile radius to show the user how much area they cover.
My problem is that I have 63 .kml files for just one state in the US. I know I can remove the xml <name> and <description> to prevent the name from popping up when clicked, but I can't see that being practical with that many .kml files.
Is there a programmatic solution or API solution to prevent just the kml layers from being clickable?
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
value: 2714856
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
value: 8405837
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
value: 3857799
};
citymap['vancouver'] = {
center: new google.maps.LatLng(49.25, -123.1),
value: 603502
};
var cityCircle;
function initialize() {
// Create the map.
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(34.7361, -92.3311),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
var populationOptions = {
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].value) * 100
};
// Add the circle for this city to the map.
cityCircle = new google.maps.Circle(populationOptions);
}
var ctaLayer = new google.maps.KmlLayer({
url: 'http://www.census.gov/main/kml/countysubs_z6/AR/05003.xml'
});
ctaLayer.setMap(map);
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
});
map.panTo(position);
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<div id="map-canvas"></div>
Discretionary note: Google API does not work well with Stack Overflow's code snippet's widget.

set the KmlLayer clickable option to false
clickable boolean If true, the layer receives mouse events. Default value is true.
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
value: 2714856
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
value: 8405837
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
value: 3857799
};
citymap['vancouver'] = {
center: new google.maps.LatLng(49.25, -123.1),
value: 603502
};
var cityCircle;
function initialize() {
// Create the map.
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(34.7361, -92.3311),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
var populationOptions = {
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].value) * 100
};
// Add the circle for this city to the map.
cityCircle = new google.maps.Circle(populationOptions);
}
var ctaLayer = new google.maps.KmlLayer({
url: 'http://www.census.gov/main/kml/countysubs_z6/AR/05003.xml',
clickable: false
});
ctaLayer.setMap(map);
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
});
map.panTo(position);
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map-canvas"></div>