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Dashed Line Symbols (Polyline)

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Page Summary

This example demonstrates how to create a dashed polyline on a map using the Google Maps JavaScript API.
It achieves the dashed effect by using a symbol with an SVG path, repeated at intervals along the polyline.
The polyline's opacity is set to 0, making it invisible, while the symbol provides the visible dashed line.
You can adjust the appearance of the dashed line by modifying the symbol's properties, such as strokeOpacity, scale, and repeat.

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.

Read the documentation.

[フレーム]

TypeScript

// 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.
functioninitMap():void{
constmap=newgoogle.maps.Map(
document.getElementById("map")asHTMLElement,
{
zoom:6,
center:{lat:20.291,lng:153.027},
mapTypeId:"terrain",
}
);
// Define a symbol using SVG path notation, with an opacity of 1.
constlineSymbol={
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.
constline=newgoogle.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,
});
}
declareglobal{
interfaceWindow{
initMap:()=>void;
}
}
window.initMap=initMap;index.ts

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.
functioninitMap(){
constmap=newgoogle.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.
constlineSymbol={
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.
constline=newgoogle.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;index.js

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;
}
style.css

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>index.html

Try Sample

JSFiddle.net Google Cloud Shell

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclone-bsample-overlay-symbol-dashedhttps://github.com/googlemaps/js-samples.git
cdjs-samples
npmi
npmstart

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAME
npmi
npmstart