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RiverRegulation/common/plugin/map/ol/v6.12.0/examples/measure.html

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<!DOCTYPE html>
<html lang="en-US">
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<meta charset="UTF-8">
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<script>
window.addEventListener("load", function() {
window.cookieconsent.initialise({
'palette': {
'popup': {
'background': '#eaf7f7',
'text': '#5c7291'
},
'button': {
'background': '#56cbdb',
'text': '#ffffff'
}
},
'theme': 'edgeless',
'type': 'opt-out',
'onInitialise': function (status) {
if (!this.hasConsented()) {
gaOptout()
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if (!this.hasConsented()) {
gaOptout()
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</script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
<link rel="stylesheet" href="./css/ol.css" type="text/css">
<link rel="stylesheet" href="./resources/layout.css" type="text/css">
<script src="https://unpkg.com/elm-pep"></script>
<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
<link rel="stylesheet" href="measure.css">
<title>Measure</title>
</head>
<body>
<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt="">&nbsp;OpenLayers</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<!-- menu items that get hidden below 768px width -->
<nav class="collapse navbar-collapse" id="olmenu">
<ul class="nav navbar-nav ml-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="docdropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Docs</a>
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<li class="nav-item"><a class="nav-link" href="../apidoc/"><i class="fa fa-sitemap mr-1"></i>API</a></li>
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<a class="nav-link dropdown-toggle" href="#" id="codedropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Code</a>
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</ul>
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</header>
<div class="container-fluid line-numbers">
<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
This example uses OpenLayers v<span>6.12.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
</div>
<div class="row-fluid">
<a href="#" id="codepen-button" class="btn btn-link float-right">
<i class="fa fa-codepen fa-lg"></i> Edit
</a>
<div class="span12">
<h4 id="title">Measure</h4>
<p class="tags">
<span class="badge-group">
<a
href="./index.html?q=draw" class="badge badge-info">draw</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="draw"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-features.html&quot;&gt;Draw and Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-geodesic.html&quot;&gt;Draw and Modify Geodesic Circles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-features.html&quot;&gt;Draw Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-shapes.html&quot;&gt;Draw Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-freehand.html&quot;&gt;Freehand Drawing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./line-arrows.html&quot;&gt;LineString Arrows&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./measure.html&quot;&gt;Measure&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-scale-and-rotate.html&quot;&gt;Scale and Rotate using Modify Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./snap.html&quot;&gt;Snap Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topolis.html&quot;&gt;topolis integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./tracing.html&quot;&gt;Tracing around a polygon&lt;/a&gt;"
tabindex="0"
>12</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=edit" class="badge badge-info">edit</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="edit"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-features.html&quot;&gt;Draw and Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-geodesic.html&quot;&gt;Draw and Modify Geodesic Circles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-features.html&quot;&gt;Draw Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-shapes.html&quot;&gt;Draw Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-freehand.html&quot;&gt;Freehand Drawing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./measure.html&quot;&gt;Measure&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-features.html&quot;&gt;Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-test.html&quot;&gt;Modify Features Test&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-scale-and-rotate.html&quot;&gt;Scale and Rotate using Modify Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./snap.html&quot;&gt;Snap Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topolis.html&quot;&gt;topolis integration&lt;/a&gt;"
tabindex="0"
>13</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=measure" class="badge badge-info">measure</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="measure"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./measure.html&quot;&gt;Measure&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;"
tabindex="0"
>2</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=vector" class="badge badge-info">vector</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="vector"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-vector-tiles-advanced.html&quot;&gt;Advanced Mapbox Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri.html&quot;&gt;ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cluster.html&quot;&gt;Clustered Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-animation.html&quot;&gt;Custom Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-circle-render.html&quot;&gt;Custom Circle Render&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-hit-detection-renderer.html&quot;&gt;Custom Hit Detection Render&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-interactions.html&quot;&gt;Custom Interactions&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./polygon-styles.html&quot;&gt;Custom Polygon Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./drag-and-drop-image-vector.html&quot;&gt;Drag-and-Drop Image Vector&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-features.html&quot;&gt;Draw and Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-geodesic.html&quot;&gt;Draw and Modify Geodesic Circles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-features.html&quot;&gt;Draw Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-shapes.html&quot;&gt;Draw Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-clusters.html&quot;&gt;Earthquake Clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-earthquakes.html&quot;&gt;Earthquakes in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-custom-symbol.html&quot;&gt;Earthquakes with custom symbols&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./flight-animation.html&quot;&gt;Flight Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./fractal.html&quot;&gt;Fractal Rendering&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-freehand.html&quot;&gt;Freehand Drawing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./geojson.html&quot;&gt;GeoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./geojson-vt.html&quot;&gt;geojson-vt integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-icon.html&quot;&gt;Icon modification&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./jsts.html&quot;&gt;JSTS Integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./line-arrows.html&quot;&gt;LineString Arrows&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-vector-layer.html&quot;&gt;Mapbox Vector Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-vector-tiles.html&quot;&gt;Mapbox Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-layer.html&quot;&gt;Mapbox-gl Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./measure.html&quot;&gt;Measure&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-features.html&quot;&gt;Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-test.html&quot;&gt;Modify Features Test&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./ogc-vector-tiles.html&quot;&gt;OGC Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./osm-vector-tiles.html&quot;&gt;OSM Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-osm.html&quot;&gt;OSM XML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./regularshape.html&quot;&gt;Regular Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-scale-and-rotate.html&quot;&gt;Scale and Rotate using Modify Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./select-features.html&quot;&gt;Select Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./select-hover-features.html&quot;&gt;Select Features by Hover&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./select-multiple-features.html&quot;&gt;Select multiple Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./snap.html&quot;&gt;Snap Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./street-labels.html&quot;&gt;Street Labels&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./style-renderer.html&quot;&gt;Style renderer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./synthetic-lines.html&quot;&gt;Synthetic Lines&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./synthetic-points.html&quot;&gt;Synthetic Points&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-timezones.html&quot;&gt;Timezones in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topojson.html&quot;&gt;TopoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topolis.html&quot;&gt;topolis integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./tracing.html&quot;&gt;Tracing around a polygon&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./translate-features.html&quot;&gt;Translate Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./turf.html&quot;&gt;turf.js&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-clipping-vector.html&quot;&gt;Vector Clipping Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./image-vector-layer.html&quot;&gt;Vector Image Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-label-decluttering.html&quot;&gt;Vector Label Decluttering&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-labels.html&quot;&gt;Vector Labels&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-layer.html&quot;&gt;Vector Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./hitdetect-vector.html&quot;&gt;Vector Layer Hit Detection&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs.html&quot;&gt;WFS&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-getfeature.html&quot;&gt;WFS - GetFeature&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-geographic.html&quot;&gt;WFS with geographic coordinates&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wind-arrows.html&quot;&gt;Wind Arrows&lt;/a&gt;"
tabindex="0"
>68</a>
</span>
</p>
<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
<div class="modal-dialog modal-dialog-scrollable" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="tag-example-title"></h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
</div>
<div class="modal-body">
<div class="list-group"></div>
</div>
</div>
</div>
</div>
<div id="map" class="map"></div>
<form class="form-inline">
<label for="type">Measurement type &nbsp;</label>
<select id="type">
<option value="length">Length (LineString)</option>
<option value="area">Area (Polygon)</option>
</select>
</form>
</div>
<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
<input id="codesandbox-params" type="hidden" name="parameters">
</form>
</div>
<div class="row-fluid">
<div class="span12">
<p id="shortdesc">Using a draw interaction to measure lengths and areas.</p>
<div id="docs"><p>The <code>getLength()</code> and <code>getArea()</code> functions calculate spherical lengths and areas for geometries. Lengths are calculated by assuming great circle segments between geometry coordinates. Areas are calculated as if edges of polygons were great circle segments.</p> <p>Note that the <code>geometry.getLength()</code> and <code>geometry.getArea()</code> methods return measures of projected (planar) geometries. These can be very different than on-the-ground measures in certain situations — in northern and southern latitudes using Web Mercator for example. For better results, use the functions in the <code>ol/sphere</code> module.</p>
</div>
</div>
</div>
<div class="row-fluid">
<h5 class="source-heading">main.js</h5>
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import Draw from &#x27;ol/interaction/Draw&#x27;;
import Map from &#x27;ol/Map&#x27;;
import Overlay from &#x27;ol/Overlay&#x27;;
import View from &#x27;ol/View&#x27;;
import {Circle as CircleStyle, Fill, Stroke, Style} from &#x27;ol/style&#x27;;
import {LineString, Polygon} from &#x27;ol/geom&#x27;;
import {OSM, Vector as VectorSource} from &#x27;ol/source&#x27;;
import {Tile as TileLayer, Vector as VectorLayer} from &#x27;ol/layer&#x27;;
import {getArea, getLength} from &#x27;ol/sphere&#x27;;
import {unByKey} from &#x27;ol/Observable&#x27;;
const raster &#x3D; new TileLayer({
source: new OSM(),
});
const source &#x3D; new VectorSource();
const vector &#x3D; new VectorLayer({
source: source,
style: new Style({
fill: new Fill({
color: &#x27;rgba(255, 255, 255, 0.2)&#x27;,
}),
stroke: new Stroke({
color: &#x27;#ffcc33&#x27;,
width: 2,
}),
image: new CircleStyle({
radius: 7,
fill: new Fill({
color: &#x27;#ffcc33&#x27;,
}),
}),
}),
});
/**
* Currently drawn feature.
* @type {import(&quot;../src/ol/Feature.js&quot;).default}
*/
let sketch;
/**
* The help tooltip element.
* @type {HTMLElement}
*/
let helpTooltipElement;
/**
* Overlay to show the help messages.
* @type {Overlay}
*/
let helpTooltip;
/**
* The measure tooltip element.
* @type {HTMLElement}
*/
let measureTooltipElement;
/**
* Overlay to show the measurement.
* @type {Overlay}
*/
let measureTooltip;
/**
* Message to show when the user is drawing a polygon.
* @type {string}
*/
const continuePolygonMsg &#x3D; &#x27;Click to continue drawing the polygon&#x27;;
/**
* Message to show when the user is drawing a line.
* @type {string}
*/
const continueLineMsg &#x3D; &#x27;Click to continue drawing the line&#x27;;
/**
* Handle pointer move.
* @param {import(&quot;../src/ol/MapBrowserEvent&quot;).default} evt The event.
*/
const pointerMoveHandler &#x3D; function (evt) {
if (evt.dragging) {
return;
}
/** @type {string} */
let helpMsg &#x3D; &#x27;Click to start drawing&#x27;;
if (sketch) {
const geom &#x3D; sketch.getGeometry();
if (geom instanceof Polygon) {
helpMsg &#x3D; continuePolygonMsg;
} else if (geom instanceof LineString) {
helpMsg &#x3D; continueLineMsg;
}
}
helpTooltipElement.innerHTML &#x3D; helpMsg;
helpTooltip.setPosition(evt.coordinate);
helpTooltipElement.classList.remove(&#x27;hidden&#x27;);
};
const map &#x3D; new Map({
layers: [raster, vector],
target: &#x27;map&#x27;,
view: new View({
center: [-11000000, 4600000],
zoom: 15,
}),
});
map.on(&#x27;pointermove&#x27;, pointerMoveHandler);
map.getViewport().addEventListener(&#x27;mouseout&#x27;, function () {
helpTooltipElement.classList.add(&#x27;hidden&#x27;);
});
const typeSelect &#x3D; document.getElementById(&#x27;type&#x27;);
let draw; // global so we can remove it later
/**
* Format length output.
* @param {LineString} line The line.
* @return {string} The formatted length.
*/
const formatLength &#x3D; function (line) {
const length &#x3D; getLength(line);
let output;
if (length &gt; 100) {
output &#x3D; Math.round((length / 1000) * 100) / 100 + &#x27; &#x27; + &#x27;km&#x27;;
} else {
output &#x3D; Math.round(length * 100) / 100 + &#x27; &#x27; + &#x27;m&#x27;;
}
return output;
};
/**
* Format area output.
* @param {Polygon} polygon The polygon.
* @return {string} Formatted area.
*/
const formatArea &#x3D; function (polygon) {
const area &#x3D; getArea(polygon);
let output;
if (area &gt; 10000) {
output &#x3D; Math.round((area / 1000000) * 100) / 100 + &#x27; &#x27; + &#x27;km&lt;sup&gt;2&lt;/sup&gt;&#x27;;
} else {
output &#x3D; Math.round(area * 100) / 100 + &#x27; &#x27; + &#x27;m&lt;sup&gt;2&lt;/sup&gt;&#x27;;
}
return output;
};
function addInteraction() {
const type &#x3D; typeSelect.value &#x3D;&#x3D; &#x27;area&#x27; ? &#x27;Polygon&#x27; : &#x27;LineString&#x27;;
draw &#x3D; new Draw({
source: source,
type: type,
style: new Style({
fill: new Fill({
color: &#x27;rgba(255, 255, 255, 0.2)&#x27;,
}),
stroke: new Stroke({
color: &#x27;rgba(0, 0, 0, 0.5)&#x27;,
lineDash: [10, 10],
width: 2,
}),
image: new CircleStyle({
radius: 5,
stroke: new Stroke({
color: &#x27;rgba(0, 0, 0, 0.7)&#x27;,
}),
fill: new Fill({
color: &#x27;rgba(255, 255, 255, 0.2)&#x27;,
}),
}),
}),
});
map.addInteraction(draw);
createMeasureTooltip();
createHelpTooltip();
let listener;
draw.on(&#x27;drawstart&#x27;, function (evt) {
// set sketch
sketch &#x3D; evt.feature;
/** @type {import(&quot;../src/ol/coordinate.js&quot;).Coordinate|undefined} */
let tooltipCoord &#x3D; evt.coordinate;
listener &#x3D; sketch.getGeometry().on(&#x27;change&#x27;, function (evt) {
const geom &#x3D; evt.target;
let output;
if (geom instanceof Polygon) {
output &#x3D; formatArea(geom);
tooltipCoord &#x3D; geom.getInteriorPoint().getCoordinates();
} else if (geom instanceof LineString) {
output &#x3D; formatLength(geom);
tooltipCoord &#x3D; geom.getLastCoordinate();
}
measureTooltipElement.innerHTML &#x3D; output;
measureTooltip.setPosition(tooltipCoord);
});
});
draw.on(&#x27;drawend&#x27;, function () {
measureTooltipElement.className &#x3D; &#x27;ol-tooltip ol-tooltip-static&#x27;;
measureTooltip.setOffset([0, -7]);
// unset sketch
sketch &#x3D; null;
// unset tooltip so that a new one can be created
measureTooltipElement &#x3D; null;
createMeasureTooltip();
unByKey(listener);
});
}
/**
* Creates a new help tooltip
*/
function createHelpTooltip() {
if (helpTooltipElement) {
helpTooltipElement.parentNode.removeChild(helpTooltipElement);
}
helpTooltipElement &#x3D; document.createElement(&#x27;div&#x27;);
helpTooltipElement.className &#x3D; &#x27;ol-tooltip hidden&#x27;;
helpTooltip &#x3D; new Overlay({
element: helpTooltipElement,
offset: [15, 0],
positioning: &#x27;center-left&#x27;,
});
map.addOverlay(helpTooltip);
}
/**
* Creates a new measure tooltip
*/
function createMeasureTooltip() {
if (measureTooltipElement) {
measureTooltipElement.parentNode.removeChild(measureTooltipElement);
}
measureTooltipElement &#x3D; document.createElement(&#x27;div&#x27;);
measureTooltipElement.className &#x3D; &#x27;ol-tooltip ol-tooltip-measure&#x27;;
measureTooltip &#x3D; new Overlay({
element: measureTooltipElement,
offset: [0, -15],
positioning: &#x27;bottom-center&#x27;,
stopEvent: false,
insertFirst: false,
});
map.addOverlay(measureTooltip);
}
/**
* Let user change the geometry type.
*/
typeSelect.onchange &#x3D; function () {
map.removeInteraction(draw);
addInteraction();
};
addInteraction();
</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">index.html</h5>
<pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
&lt;meta charset="UTF-8"&gt;
&lt;title&gt;Measure&lt;/title&gt;
&lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
&lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
&lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
&lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
&lt;style&gt;
.map {
width: 100%;
height:400px;
}
.ol-tooltip {
position: relative;
background: rgba(0, 0, 0, 0.5);
border-radius: 4px;
color: white;
padding: 4px 8px;
opacity: 0.7;
white-space: nowrap;
font-size: 12px;
cursor: default;
user-select: none;
}
.ol-tooltip-measure {
opacity: 1;
font-weight: bold;
}
.ol-tooltip-static {
background-color: #ffcc33;
color: black;
border: 1px solid white;
}
.ol-tooltip-measure:before,
.ol-tooltip-static:before {
border-top: 6px solid rgba(0, 0, 0, 0.5);
border-right: 6px solid transparent;
border-left: 6px solid transparent;
content: &quot;&quot;;
position: absolute;
bottom: -6px;
margin-left: -7px;
left: 50%;
}
.ol-tooltip-static:before {
border-top-color: #ffcc33;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;form class&#x3D;&quot;form-inline&quot;&gt;
&lt;label for&#x3D;&quot;type&quot;&gt;Measurement type &amp;nbsp;&lt;/label&gt;
&lt;select id&#x3D;&quot;type&quot;&gt;
&lt;option value&#x3D;&quot;length&quot;&gt;Length (LineString)&lt;/option&gt;
&lt;option value&#x3D;&quot;area&quot;&gt;Area (Polygon)&lt;/option&gt;
&lt;/select&gt;
&lt;/form&gt;
&lt;script src="main.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">package.json</h5>
<pre><code id="example-pkg-source" class="language-json">{
&quot;name&quot;: &quot;measure&quot;,
&quot;dependencies&quot;: {
&quot;ol&quot;: &quot;6.12.0&quot;
},
&quot;devDependencies&quot;: {
&quot;parcel&quot;: &quot;^2.0.0&quot;
},
&quot;scripts&quot;: {
&quot;start&quot;: &quot;parcel index.html&quot;,
&quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
}
}</code></pre>
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<script src="./resources/common.js"></script>
<script src="common.js"></script>
<script src="measure.js"></script>
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