Is there a limit on how many markers I can put on a google maps route ? If yes, how to overcome it ?
My developer said he coul开发者_如何转开发dn't add more than 10 markers on a route !! And yes, I am unable to find anything on web in this context.
TIA
According to the documentation for v3:
The maximum allowed waypoints is 8, plus the origin, and destination. Maps API Premier customers are allowed 23 waypoints, plus the origin, and destination.
So, yes, the limit is ten when you include the start and end. So, if you want more than that, you can either upgrade to Maps Premier ($$) or try to work around it.
A possible work around is to:
- Group waypoints in groups of 9 that are closest to each other
- Do directions for each group, with starting point of each group being the ending point of the last group
- If you can allow the user to specify the order instead of optimizing it code, that makes it easier
- The distance matrix feature may be to help figure out distances between waypoints, as it has a higher limit for number of points.
Another work around is to go back to Google Maps API V2, which still appears to have the larger 25 limit.
A last work around is do your own implementation of the traveling salesman problem, but that is not trivial.
It is possible to place multiple markers which means more than 10 i am used in my project also.i used ajax functionality in my project. and the total code it will useful for those who needs this requirement is
function positionCheck(){
var username = $("#xmlLabel").val();
var searchDate = $("#searchDate").val();
if (username != "" && searchDate != '') {
//$('#searchLoc').attr('action', "<c:url value='/searchLocationnormal.mnt'/>").submit();
$.ajax({
type : "POST",
url : "searchLocation.mnt",
data : "xmlLabel=" + username + "&searchDate=" + searchDate,
dataType : "json",
mimeType : 'application/json',
success : function(data) {
if (data != "") {
initialize(data);
//setTimeout(function(){ }, 5000);
} else {
alert("No data available ");
}
},
error : function(e) {
alert('Error: ' + e, "Alert Box");
}
});
}
var stops=0;
var counts = 0;
var size = 0;
function initialize(data) {
size = 0;
counts = 0;
stops = data;
size = stops.length;
if (stops.length > 0) {
var map = new window.google.maps.Map(document
.getElementById("map"));
// new up complex objects before passing them around
var directionsDisplay = new window.google.maps.DirectionsRenderer(
{
suppressMarkers : true,
polylineOptions : {
strokeColor : "black"
}
});
var directionsService = new window.google.maps.DirectionsService();
Tour_startUp(stops);
window.tour.loadMap(map, directionsDisplay);
window.tour.fitBounds(map,stops);
/* if (stops.length > 1) */
window.tour.calcRoute(stops,directionsService,
directionsDisplay,size);
}
}
function Tour_startUp(stops) {
var stops=stops;
var counts=0;
if (!window.tour) window.tour = {
// map: google map object
// directionsDisplay: google directionsDisplay object (comes in empty)
loadMap: function (map, directionsDisplay) {
var myOptions = {
zoom:10,
center: new window.google.maps.LatLng(17.379818, 78.478542), // default to Hyderabad
mapTypeId: window.google.maps.MapTypeId.ROADMAP
};
map.setOptions(myOptions);
directionsDisplay.setMap(map);
},
fitBounds: function (map,stops) {
var bounds = new window.google.maps.LatLngBounds();
// extend bounds for each record
jQuery.each(stops, function (key, val) {
var myLatlng = new window.google.maps.LatLng(val.latitude, val.longitude);
bounds.extend(myLatlng);
});
map.fitBounds(bounds);
},
here is the main logic for question "Is there a limit on how many markers I can put on a google maps route?" ANSWER:YES IT POSSIBLE
calcRoute: function (stops,directionsService, directionsDisplay,size) {
size=size;
var batches = [];
var itemsPerBatch = 10; // google API max = 10 - 1 start, 1 stop, and 8 waypoints
var itemsCounter = 0;
var wayptsExist = stops.length > 0;
var tempp=0;
while (wayptsExist) {
var subBatch = [];
var subitemsCounter = 0;
for (var j = itemsCounter; j < stops.length; j++) {
subitemsCounter++;
tempp++;
subBatch.push({
location: new window.google.maps.LatLng(stops[j].latitude, stops[j].longitude),
stopover: true
});
if (subitemsCounter == itemsPerBatch)
break;
}
itemsCounter += subitemsCounter;
batches.push(subBatch);
wayptsExist = itemsCounter < stops.length;
// If it runs again there are still points. Minus 1 before continuing to
// start up with end of previous tour leg
itemsCounter--;
}
// now we should have a 2 dimensional array with a list of a list of waypoints
var combinedResults;
var unsortedResults = [{}]; // to hold the counter and the results themselves as they come back, to later sort
var directionsResultsReturned = 0;
for (var k = 0; k < batches.length; k++) {
var lastIndex = batches[k].length - 1;
var start = batches[k][0].location;
//delay(600);
var end = batches[k][lastIndex].location;
// trim first and last entry from array
var waypts = [];
waypts = batches[k];
waypts.splice(0, 1);
waypts.splice(waypts.length - 1, 1);
var request = {
origin: start,
destination: end,
waypoints: waypts,
travelMode: window.google.maps.TravelMode.WALKING
};
(function (kk) {
directionsService.route(request, function (result, status) {
if (status == window.google.maps.DirectionsStatus.OK) {
var unsortedResult = { order: kk, result: result };
unsortedResults.push(unsortedResult);
//alert("count test");
directionsResultsReturned++;
if (directionsResultsReturned == batches.length) // we've received all the results. put to map
{
// sort the returned values into their correct order
unsortedResults.sort(function (a, b) { return parseFloat(a.order) - parseFloat(b.order); });
var count = 0;
for (var key in unsortedResults) {
if (unsortedResults[key].result != null) {
if (unsortedResults.hasOwnProperty(key)) {
if (count == 0) // first results. new up the combinedResults object
combinedResults = unsortedResults[key].result;
else {
// only building up legs, overview_path, and bounds in my consolidated object. This is not a complete
// directionResults object, but enough to draw a path on the map, which is all I need
combinedResults.routes[0].legs = combinedResults.routes[0].legs.concat(unsortedResults[key].result.routes[0].legs);
combinedResults.routes[0].overview_path = combinedResults.routes[0].overview_path.concat(unsortedResults[key].result.routes[0].overview_path);
combinedResults.routes[0].bounds = combinedResults.routes[0].bounds.extend(unsortedResults[key].result.routes[0].bounds.getNorthEast());
combinedResults.routes[0].bounds = combinedResults.routes[0].bounds.extend(unsortedResults[key].result.routes[0].bounds.getSouthWest());
}
count++;
}
}
}
directionsDisplay.setDirections(combinedResults);
var legs = combinedResults.routes[0].legs;
var summaryPanel = document.getElementById('directions_panel');
summaryPanel.innerHTML = '';
var totdist=0;
for (var i=0; i < legs.length;i++){
var markerletter = "A".charCodeAt(0);
var markerletter2= "B".charCodeAt(0)
markerletter += i;
markerletter2 += i;
markerletter = String.fromCharCode(markerletter);
markerletter2 = String.fromCharCode(markerletter2);
createMarker(directionsDisplay.getMap(),legs[i].start_location,legs[i].start_address,markerletter,size);//To display location address on the marker
var routeSegment = i + 1;
var point=+routeSegment+1;
summaryPanel.innerHTML += '<b>Route Segment: ' + routeSegment + '</b><br>';
summaryPanel.innerHTML += '<b>Point '+ routeSegment +' :</b>'+ ' ' +legs[i].start_address + ' <br> ';
summaryPanel.innerHTML += '<b>Point '+ point +' :</b>'+ ' '+legs[i].end_address + '<br>';
summaryPanel.innerHTML += '<b>Distance Covered '+' :</b>'+legs[i].distance.text + '<br><br>';
var test=legs[i].distance.text.split(' ');
var one=parseFloat(test[0]);
if(test[1]=="m"){
var one=parseFloat(test[0]/1000);
}
totdist=parseFloat(totdist)+parseFloat(one);
}
summaryPanel.innerHTML += '<b> Total Distance :'+totdist + 'km'+ '</b><br><br>';
var i=legs.length;
var markerletter = "A".charCodeAt(0);
markerletter += i;
markerletter = String.fromCharCode(markerletter);
createMarker(directionsDisplay.getMap(),legs[legs.length-1].end_location,legs[legs.length-1].end_address,markerletter,size);
}
}
});
})(k);
function delay(ms) {
ms += new Date().getTime();
while (new Date() < ms){}
}
}
}//calculate route end
};
}
//to show information on clicking marker
var infowindow = new google.maps.InfoWindow(
{
size: new google.maps.Size(150,50)
});
var icons = new Array();
icons["red"] = new google.maps.MarkerImage("mapIcons/marker_red.png",
// This marker is 20 pixels wide by 34 pixels tall.
new google.maps.Size(20, 34),
// The origin for this image is 0,0.
new google.maps.Point(0,0),
// The anchor for this image is at 9,34.
new google.maps.Point(9, 34));
function getMarkerImage(iconStr,size) {
counts++;
if(counts==size){
var markerimageLoc = "http://www.maps.google.com/mapfiles/ms/icons/blue.png";
counts = 0;
}else{
if (iconStr=="undefined") {
iconStr = "red";
var markerimageLoc = "http://www.maps.google.com/mapfiles/ms/icons/red.png";
}
else{
var markerimageLoc="http://www.google.com/mapfiles/marker"+ iconStr +".png";
// var markerimageLoc = "http://www.maps.google.com/mapfiles/ms/icons/red.png";
}
}
icons[iconStr] = new google.maps.MarkerImage(markerimageLoc,
// This marker is 20 pixels wide by 34 pixels tall.
new google.maps.Size(25, 34),
// The origin for this image is 0,0.
new google.maps.Point(0,0),
// The anchor for this image is at 6,20.
new google.maps.Point(9, 34));
return icons[iconStr];
}
// Marker sizes are expressed as a Size of X,Y
// where the origin of the image (0,0) is located
// in the top left of the image.
// Origins, anchor positions and coordinates of the marker
// increase in the X direction to the right and in
// the Y direction down.
var iconShadow = new google.maps.MarkerImage('http://www.google.com/mapfiles/shadow50.png',
// The shadow image is larger in the horizontal dimension
// while the position and offset are the same as for the main image.
new google.maps.Size(37, 34),
new google.maps.Point(0,0),
new google.maps.Point(9, 34));
// Shapes define the clickable region of the icon.
// The type defines an HTML <area> element 'poly' which
// traces out a polygon as a series of X,Y points. The final
// coordinate closes the poly by connecting to the first
// coordinate.
var iconShape = {
coord: [9,0,6,1,4,2,2,4,0,8,0,12,1,14,2,16,5,19,7,23,8,26,9,30,9,34,11,34,11,30,12,26,13,24,14,21,16,18,18,16,20,12,20,8,18,4,16,2,15,1,13,0],
type: 'poly'
};
function createMarker(map, latlng, label, character,size) {
var markerletter = character;
var size=size;
if (/[^a-zA-Z]/.test(character)) {
var markerletter = "undefined";
}
var contentString = '<b>' + label + '</b><br>';
var marker = new google.maps.Marker({
position : latlng,
map : map,
shadow : iconShadow,
icon : getMarkerImage(markerletter,size),
shape : iconShape,
title : label,
zIndex : Math.round(latlng.lat() * -100000) << 5
});
marker.myname = label;
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(contentString);
infowindow.open(map, marker);
});
return marker;
}
}
following is Screen shot of my project
click here to show Screen shot
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
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