How to create a grid in Google Maps api v3
I am new to this. What I am trying to do is create 2 markers (they are draggable), there will be a grid between them, like http://prntscr.com/4nx9f3 . When I change one of the markers, the grid needs to be changed. I am trying to draw with polylines. By the way, I cannot get latitude or longitude with marker1.getPosition().lat()
. thanks for any help ...
all my code:
<!DOCTYPE html>
<html>
<head>
<title>Simple 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>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
var map;
var marker1;
var marker2;
function initialize() {
var mapOptions = {
zoom: 10,
center: new google.maps.LatLng(50.3, 44.3)
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
marker1 = new google.maps.Marker({
position: new google.maps.LatLng(50.1, 44.1),
map: map,
draggable: true,
title: 'marker1 '
});
marker2 = new google.maps.Marker({
position: new google.maps.LatLng(50.5, 44.5),
map: map,
draggable: true,
title: 'marker2'
});
var flightPlanCoordinates = [
marker1.getPosition(),
marker2.getPosition(),
];
// code below is not working
/*
google.maps.event.addListener(marker1, 'dragend', function () {
polyline.LatLngBounds(new google.maps.LatLng(marker1.getPosition(), marker2.getPosition()));
});
google.maps.event.addListener(marker2, 'dragend', function () {
polyline.LatLngBounds(new google.maps.LatLng(marker1.getPosition(), marker2.getPosition()));
*/
var polyline = new google.maps.Polyline(
{ path: flightPlanCoordinates,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
var lat1 = marker1.getPosition().lat();
var lng1 = marker1.getPosition().lng();
var lat2 = marker2.getPosition().lat();
var lng2 = marker2.getPosition().lng();
// I tried to get distance between 2 markers but it did not work either
/* function distance(
lat1,
lng1,
lat2,
lng2
) {
var R = 6371;
var a =
0.5 - Math.cos((lat2 - lat1) * Math.PI / 180) / 2 +
Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
(1 - Math.cos((lon2 - lon1) * Math.PI / 180)) / 2;
return R * 2 * Math.asin(Math.sqrt(a));
}
*/
polyline.setMap(map);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>
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3 answers
I think this is what you are trying to do. Changed your rectangleLng array to a 2D array and changed the excLat / excLng variables so they are not rounded (they are backward, and extLat wants to be up / down, excLng needs to be side by side).
snippet of code:
var map;
var marker1;
var marker2;
var rectangle;
var infowindow = new google.maps.InfoWindow();
function initialize() {
var mapOptions = {
zoom: 11,
center: new google.maps.LatLng(38.4, 26.7)
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
marker1 = new google.maps.Marker({
position: new google.maps.LatLng(38.3, 26.6),
map: map,
draggable: true,
title: 'marker1'
});
google.maps.event.addListener(marker1, 'click', function(evt) {
infowindow.setContent(marker1.getPosition().toUrlValue(6));
infowindow.open(map, this);
});
marker2 = new google.maps.Marker({
position: new google.maps.LatLng(38.5, 26.8),
map: map,
draggable: true,
title: 'marker2'
});
google.maps.event.addListener(marker2, 'click', function(evt) {
infowindow.setContent(marker1.getPosition().toUrlValue(6));
infowindow.open(map, this);
});
rectangle = new google.maps.Rectangle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
bounds: new google.maps.LatLngBounds(
marker1.getPosition(),
marker2.getPosition())
});
var leftSideDist = Math.round((marker2.getPosition().lng() - marker1.getPosition().lng()) * 10000) / 100;
var belowSideDist = Math.round((marker2.getPosition().lat() - marker1.getPosition().lat()) * 10000) / 100;
google.maps.event.addListener(marker1, 'dragend', function() {
rectangle.setBounds(new google.maps.LatLngBounds(marker1.getPosition(), marker2.getPosition()));
leftSideDist = Math.round((marker2.getPosition().lng() - marker1.getPosition().lng()) * 10000) / 100;
makeGrid();
});
google.maps.event.addListener(marker2, 'dragend', function() {
rectangle.setBounds(new google.maps.LatLngBounds(marker1.getPosition(), marker2.getPosition()));
belowSideDist = Math.round((marker2.getPosition().lat() - marker1.getPosition().lat()) * 10000) / 100;
makeGrid();
});
makeGrid();
}
var rectangleLat = [];
var rectangleLng = [];
function makeGrid() {
for (x in rectangleLng) {
for (y in rectangleLng[x]) {
if (rectangleLng[x][y].setMap) {
rectangleLng[x][y].setMap(null)
rectangleLng[x][y] = null;
}
}
}
var leftSideDist = marker2.getPosition().lng() - marker1.getPosition().lng();
var belowSideDist = marker2.getPosition().lat() - marker1.getPosition().lat();
var dividerLat = 5;
var dividerLng = 5; //ilerde kullanıcıdan alınacak
var excLat = belowSideDist / dividerLat;
var excLng = leftSideDist / dividerLng;
var m1Lat = marker1.getPosition().lat();
var m1Lng = marker1.getPosition().lng();
var m2Lat = marker2.getPosition().lat();
var m2Lng = marker2.getPosition().lng();
document.getElementById('info').innerHTML += "dividerLat=" + dividerLat + ", excLat=" + excLat + "<br>";
document.getElementById('info').innerHTML += "dividerLng=" + dividerLat + ", excLng=" + excLng + "<br>";
document.getElementById('info').innerHTML += "m1=" + marker1.getPosition().toUrlValue(6) + "<br>";
document.getElementById('info').innerHTML += "m2=" + marker2.getPosition().toUrlValue(6) + "<br>";
for (var i = 0; i < dividerLat; i++) {
if (!rectangleLng[i]) rectangleLng[i] = [];
for (var j = 0; j < dividerLng; j++) {
if (!rectangleLng[i][j]) rectangleLng[i][j] = {};
rectangleLng[i][j] = new google.maps.Rectangle({
strokeColor: '#FFFFFF',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.1,
map: map,
bounds: new google.maps.LatLngBounds(
new google.maps.LatLng(m1Lat + (excLat * i), m1Lng + (excLng * j)),
new google.maps.LatLng(m1Lat + (excLat * (i + 1)), m1Lng + (excLng * (j + 1))))
});
document.getElementById('info').innerHTML += "[i=" + i + ",j=" + j + "]:" + rectangleLng[i][j].getBounds() + "<br>";
} //for j Lng
} //for i Lat
document.getElementById('left').value = leftSideDist;
document.getElementById('blw').value = belowSideDist;
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
z-index: 5;
background-color: #fff;
padding: 5px;
/* border: 1px solid #999;*/
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map-canvas"></div>
<div id="panel" style="margin-left:-320px">leftSideDist:
<input type="text" readonly id="left">belowSideDist:
<input type="text" readonly id="blw">
</div>
<div id="info"></div>
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To get the coordinates of the marker after dragging it, change:
google.maps.event.addListener(marker1, 'dragend', function() {
polyline.LatLngBounds(new google.maps.LatLng(marker1.getPosition(), marker2.getPosition()));
});
in
google.maps.event.addListener(marker1, 'dragend', function(event) {
polyline.LatLngBounds(event.latLng);
});
However, there is no function LatLngBounds
for the polyline object.
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As far as i done:
<!DOCTYPE html>
<html>
<head>
<title>Simple 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
}
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=geometry"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?
sensor=false&v=3&libraries=geometry"></script>
<script>
var map;
var marker1;
var marker2;
var rectangle;
function initialize() {
var mapOptions = {
zoom: 11,
center: new google.maps.LatLng(38.4, 26.7)
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
marker1 = new google.maps.Marker({
position: new google.maps.LatLng(38.3, 26.6),
map: map,
draggable: true,
title: 'marker1'
});
marker2 = new google.maps.Marker({
position: new google.maps.LatLng(38.5, 26.8),
map: map,
draggable: true,
title: 'marker2'
});
rectangle = new google.maps.Rectangle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
bounds: new google.maps.LatLngBounds(
marker1.getPosition(),
marker2.getPosition())
});
var leftSideDist = Math.round((marker2.getPosition().lng() - marker1.getPosition().lng()) * 10000) / 100;
var belowSideDist = Math.round((marker2.getPosition().lat() - marker1.getPosition().lat()) * 10000) / 100;
google.maps.event.addListener(marker1, 'dragend', function () {
rectangle.setBounds(new google.maps.LatLngBounds(marker1.getPosition(), marker2.getPosition()));
leftSideDist = Math.round((marker2.getPosition().lng() - marker1.getPosition().lng()) * 10000) / 100;
});
google.maps.event.addListener(marker2, 'dragend', function () {
rectangle.setBounds(new google.maps.LatLngBounds(marker1.getPosition(), marker2.getPosition()));
belowSideDist = Math.round((marker2.getPosition().lat() - marker1.getPosition().lat()) * 10000) / 100;
});
var leftSideDist = Math.round((marker2.getPosition().lng() - marker1.getPosition().lng()) * 10000) / 100;
var belowSideDist = Math.round((marker2.getPosition().lat() - marker1.getPosition().lat()) * 10000) / 100;
var dividerLat = 5;
var dividerLng = 5; //ilerde kullanıcıdan alınacak
var excLat = leftSideDist / dividerLat;
var excLng = belowSideDist / dividerLng;
var rectangleLat[];
var rectangleLng[];
var m1Lat = marker1.getPosition().lat();
var m1Lng = marker1.getPosition().lng();
var m2Lat = marker2.getPosition().lat();
var m2Lng = marker2.getPosition().lng();
for (var i = 0; i < dividerLat; i++) {
for (var j = 0; j < dividerLng; j++) {
rectangleLng[i*5+j] = new google.maps.Rectangle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
bounds: new google.maps.LatLngBounds(
( m1Lat , (excLng*(j+1) ) ),
( m1Lat+excLat, m2Lng+(excLng*(j+1) ) ) )
});
}//for j Lng
}//for i Lat
document.getElementById('left').value = leftSideDist;
document.getElementById('blw').value = belowSideDist;
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
<div id="panel" style="margin-left:-320px">
leftSideDist: <input type="text" readonly id="left">
belowSideDist: <input type="text" readonly id="blw">
</div>
</body>
</html>
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