Google maps - draw multiple separate polylines - google-maps

Question

So I am trying to draw multiple separated polylines on google map.
So far I don't have so much:
<script>
var center = new google.maps.LatLng(51.97559, 4.12565);
var map = new google.maps.Map(document.getElementById('map'), {
center: center,
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var infowindow = new google.maps.InfoWindow({
map: map
});
var bounds = new google.maps.LatLngBounds();
// start coordinates
var start = ['51.97559, 4.12565',
'55.46242, 8.43872',
'49.49259, 0.1065',
'50.36862, -4.13412']
// end coordinates
var end = ['51.94784, 1.2539',
'51.74784, 1.2539',
'50.79726, -1.11048',
'43.45846, -3.80685']
function initialize() {
for (var i=0; i < end.length; i++){
calcRoute(start[i], end [i]);
}
}
function calcRoute(source,destination){
var polyline = new google.maps.Polyline({
path: [],
strokeColor: 'red',
strokeWeight: 2,
strokeOpacity: 1
});
polyline.setMap(map);
}
</script>
I found here an interesting example, but it has DirectionsTravelMode, and I want only a straight line between two points.
So in my example I would like to have 4 not connected straight lines drawn on the map.

Answer 1

a google.maps.LatLng object is two numbers; or a google.maps.LatLngLiteral is a javascript object with a lat and a lng property, neither is a string.
for (var i=0; i < end.length; i++){
var startCoords = start[i].split(",");
var startPt = new google.maps.LatLng(startCoords[0],startCoords[1]);
var endCoords = end[i].split(",");
var endPt = new google.maps.LatLng(endCoords[0],endCoords[1]);
calcRoute(startPt, endPt);
bounds.extend(startPt);
bounds.extend(endPt);
}
map.fitBounds(bounds);
you need to add those to the polyline's path:
function calcRoute(source,destination){
var polyline = new google.maps.Polyline({
path: [source, destination],
strokeColor: 'red',
strokeWeight: 2,
strokeOpacity: 1
});
polyline.setMap(map);
}
proof of concept fiddle
code snippet:
var map;
function initialize() {
var center = new google.maps.LatLng(51.97559, 4.12565);
map = new google.maps.Map(document.getElementById('map'), {
center: center,
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var infowindow = new google.maps.InfoWindow({});
var bounds = new google.maps.LatLngBounds();
// start coordinates
var start = ['51.97559, 4.12565',
'55.46242, 8.43872',
'49.49259, 0.1065',
'50.36862, -4.13412'
]
// end coordinates
var end = ['51.94784, 1.2539',
'51.74784, 1.2539',
'50.79726, -1.11048',
'43.45846, -3.80685'
]
for (var i = 0; i < end.length; i++) {
var startCoords = start[i].split(",");
var startPt = new google.maps.LatLng(startCoords[0], startCoords[1]);
var endCoords = end[i].split(",");
var endPt = new google.maps.LatLng(endCoords[0], endCoords[1]);
calcRoute(startPt, endPt);
bounds.extend(startPt);
bounds.extend(endPt);
}
map.fitBounds(bounds);
}
function calcRoute(source, destination) {
var polyline = new google.maps.Polyline({
path: [source, destination],
strokeColor: 'red',
strokeWeight: 2,
strokeOpacity: 1
});
polyline.setMap(map);
}
google.maps.event.addDomListener(window, "load", initialize);
html,
body,
#map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>

Answer 2

Nice answer by geocodezip !
A small improvement, instead of adding many polyline elements to your map (which could later require you to keep track of them & iterate over all of them in order to remove or change them), you can put all paths in one Polygon object.
working fiddle: http://jsfiddle.net/syoels/hyh81jfz/1/
(i took geocodezip's fiddle and made small changes)
var geocoder;
var map;
function initialize() {
var center = new google.maps.LatLng(51.97559, 4.12565);
map = new google.maps.Map(document.getElementById('map'), {
center: center,
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var bounds = new google.maps.LatLngBounds();
// start coordinates
var start = ['51.97559, 4.12565',
'55.46242, 8.43872',
'49.49259, 0.1065',
'50.36862, -4.13412'
];
// end coordinates
var end = ['51.94784, 1.2539',
'51.74784, 1.2539',
'50.79726, -1.11048',
'43.45846, -3.80685'
];
var paths = [];
for (var i = 0; i < end.length; i++) {
var startCoords = start[i].split(",");
var startPt = new google.maps.LatLng(startCoords[0], startCoords[1]);
var endCoords = end[i].split(",");
var endPt = new google.maps.LatLng(endCoords[0], endCoords[1]);
paths.push([startPt, endPt]);
bounds.extend(startPt);
bounds.extend(endPt);
}
map.fitBounds(bounds);
var polyline = new google.maps.Polygon({
paths: paths,
strokeColor: 'red',
strokeWeight: 2,
strokeOpacity: 1
});
polyline.setMap(map);
}
google.maps.event.addDomListener(window, "load", initialize);
html,
body,
#map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=geometry,places&ext=.js"></script>
<div id="map"></div>