// This example converts a polyline to a dashed line, by
// setting the opacity of the polyline to 0, and drawing an opaque symbol
// at a regular interval on the polyline.
function initMap(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
zoom: 6,
center: { lat: 20.291, lng: 153.027 },
mapTypeId: "terrain",
}
);
// Define a symbol using SVG path notation, with an opacity of 1.
const lineSymbol = {
path: "M 0,-1 0,1",
strokeOpacity: 1,
scale: 4,
};
// Create the polyline, passing the symbol in the 'icons' property.
// Give the line an opacity of 0.
// Repeat the symbol at intervals of 20 pixels to create the dashed effect.
const line = new google.maps.Polyline({
path: [
{ lat: 22.291, lng: 153.027 },
{ lat: 18.291, lng: 153.027 },
],
strokeOpacity: 0,
icons: [
{
icon: lineSymbol,
offset: "0",
repeat: "20px",
},
],
map: map,
});
}
declare global {
interface Window {
initMap: () => void;
}
}
window.initMap = initMap;Note: Read the guide on using TypeScript and Google Maps. JavaScript
// This example converts a polyline to a dashed line, by
// setting the opacity of the polyline to 0, and drawing an opaque symbol
// at a regular interval on the polyline.
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 6,
center: { lat: 20.291, lng: 153.027 },
mapTypeId: "terrain",
});
// Define a symbol using SVG path notation, with an opacity of 1.
const lineSymbol = {
path: "M 0,-1 0,1",
strokeOpacity: 1,
scale: 4,
};
// Create the polyline, passing the symbol in the 'icons' property.
// Give the line an opacity of 0.
// Repeat the symbol at intervals of 20 pixels to create the dashed effect.
const line = new google.maps.Polyline({
path: [
{ lat: 22.291, lng: 153.027 },
{ lat: 18.291, lng: 153.027 },
],
strokeOpacity: 0,
icons: [
{
icon: lineSymbol,
offset: "0",
repeat: "20px",
},
],
map: map,
});
}
window.initMap = initMap;Note: The JavaScript is compiled from the TypeScript snippet. CSS
/*
* Always set the map height explicitly to define the size of the div element
* that contains the map.
*/
#map {
height: 100%;
}
/*
* Optional: Makes the sample page fill the window.
*/
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
HTML
<html>
<head>
<title>Dashed Line Symbols (Polyline)</title>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="module" src="./index.js"></script>
</head>
<body>
<div id="map"></div>
<!--
The `defer` attribute causes the script to execute after the full HTML
document has been parsed. For non-blocking uses, avoiding race conditions,
and consistent behavior across browsers, consider loading using Promises. See
https://developers.google.com/maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"
defer
></script>
</body>
</html>
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