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378 lines
15 KiB
HTML
378 lines
15 KiB
HTML
<!DOCTYPE html>
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<html lang="en-US">
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<head>
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<meta charset="UTF-8">
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</script>
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<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
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<script src="https://unpkg.com/lz-string@1.4.4/libs/lz-string.min.js"></script>
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window.cookieconsent.initialise({
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'button': {
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'background': '#56cbdb',
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'text': '#ffffff'
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}
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},
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'theme': 'edgeless',
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'type': 'opt-out',
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'onInitialise': function (status) {
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}
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})
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});
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</script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
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<link rel="stylesheet" href="./css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<script src="https://unpkg.com/elm-pep"></script>
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<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder"></script>
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<title>Hit Tolerance</title>
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</head>
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<body>
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<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
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<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt=""> OpenLayers</a>
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<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
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<span class="navbar-toggler-icon"></span>
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</button>
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<!-- menu items that get hidden below 768px width -->
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<nav class="collapse navbar-collapse" id="olmenu">
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<ul class="nav navbar-nav ml-auto">
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<li class="nav-item dropdown">
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<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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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="docdropdown">
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<a class="dropdown-item" href="../doc/">Docs</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
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<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
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<a class="dropdown-item" href="../doc/tutorials/"><i class="fa fa-book fa-fw mr-2 fa-lg"></i>Tutorials</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="https://stackoverflow.com/questions/tagged/openlayers"><i class="fa fa-stack-overflow fa-fw mr-2"></i>Ask a Question</a>
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<li class="nav-item active"><a class="nav-link" href="../examples/">Examples</a></li>
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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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<li class="nav-item dropdown">
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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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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="codedropdown">
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<a class="dropdown-item" href="https://github.com/openlayers/openlayers"><i class="fa fa-github fa-fw mr-2 fa-lg"></i>Repository</a>
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<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
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<div class="container-fluid line-numbers">
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<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
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<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
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This example uses OpenLayers v<span>6.5.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
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</div>
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<div class="row-fluid">
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<a href="#" id="codepen-button" class="btn btn-link float-right">
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<i class="fa fa-codepen fa-lg"></i> Edit
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</a>
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<div class="span12">
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<h4 id="title">Hit Tolerance</h4>
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<p class="tags">
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<span class="badge-group">
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<a
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href="./index.html?q=hitTolerance" class="badge badge-info">hitTolerance</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="hitTolerance"
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data-content="
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<a class="list-group-item list-group-item-action active" href="./hit-tolerance.html">Hit Tolerance</a>"
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tabindex="0"
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>1</a>
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</span>
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</p>
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<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
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<div class="modal-dialog modal-dialog-scrollable" role="document">
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<div class="modal-content">
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<div class="modal-header">
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<h5 class="modal-title" id="tag-example-title"></h5>
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<button type="button" class="close" data-dismiss="modal" aria-label="Close">
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<span aria-hidden="true">×</span>
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</button>
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</div>
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<div class="modal-body">
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<div class="list-group"></div>
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</div>
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</div>
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</div>
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</div>
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<div id="map" class="map"></div>
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<span id="status">Try to click the line in the map.</span>
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<form class="form-inline">
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<label for="hitTolerance">Hit tolerance for selecting features: </label>
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<select id="hitTolerance" class="form-control">
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<option value="0" selected>0 Pixels</option>
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<option value="5">5 Pixels</option>
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<option value="10">10 Pixels</option>
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</select>
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Area:
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<canvas id="circle" style="vertical-align: middle" />
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</form>
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</div>
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<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
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<input id="codesandbox-params" type="hidden" name="parameters">
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</form>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<p id="shortdesc">Example using the hitTolerance parameter.</p>
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<div id="docs"><p>By default, the map.forEachFeatureAtPixel() function only considers features that are directly under the provided pixel. This can make it difficult to interact with features on touch devices. To consider features within some distance of the provided pixel, use the hitTolerance option. For example, map.forEachFeatureAtPixel(pixel, callback, {hitTolerance: 3}) will call the callback with all features that are within three pixels of the provided pixel.</p>
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</div>
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</div>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">main.js</h5>
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<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
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import Feature from 'ol/Feature';
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import LineString from 'ol/geom/LineString';
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import Map from 'ol/Map';
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import View from 'ol/View';
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import {OSM, Vector as VectorSource} from 'ol/source';
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import {Stroke, Style} from 'ol/style';
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import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
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var raster = new TileLayer({
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source: new OSM(),
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});
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var style = new Style({
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stroke: new Stroke({
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color: 'black',
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width: 1,
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}),
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});
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var feature = new Feature(
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new LineString([
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[-4000000, 0],
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[4000000, 0] ])
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);
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var vector = new VectorLayer({
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source: new VectorSource({
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features: [feature],
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}),
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style: style,
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});
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var map = new Map({
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layers: [raster, vector],
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target: 'map',
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view: new View({
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center: [0, 0],
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zoom: 2,
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}),
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});
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var hitTolerance;
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var statusElement = document.getElementById('status');
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map.on('singleclick', function (e) {
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var hit = false;
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map.forEachFeatureAtPixel(
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e.pixel,
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function () {
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hit = true;
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},
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{
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hitTolerance: hitTolerance,
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}
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);
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if (hit) {
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style.getStroke().setColor('green');
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statusElement.innerHTML = 'A feature got hit!';
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} else {
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style.getStroke().setColor('black');
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statusElement.innerHTML = 'No feature got hit.';
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}
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feature.changed();
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});
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var selectHitToleranceElement = document.getElementById('hitTolerance');
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var circleCanvas = document.getElementById('circle');
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var changeHitTolerance = function () {
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hitTolerance = parseInt(selectHitToleranceElement.value, 10);
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var size = 2 * hitTolerance + 2;
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circleCanvas.width = size;
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circleCanvas.height = size;
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var ctx = circleCanvas.getContext('2d');
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ctx.clearRect(0, 0, size, size);
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ctx.beginPath();
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ctx.arc(
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hitTolerance + 1,
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hitTolerance + 1,
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hitTolerance + 0.5,
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0,
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2 * Math.PI
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);
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ctx.fill();
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ctx.stroke();
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};
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selectHitToleranceElement.onchange = changeHitTolerance;
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changeHitTolerance();
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</code></pre>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">index.html</h5>
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<pre><code id="example-html-source" class="language-markup"><!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Hit Tolerance</title>
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<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
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<script src="https://unpkg.com/elm-pep"></script>
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<style>
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.map {
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width: 100%;
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height:400px;
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}
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</style>
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</head>
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<body>
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<div id="map" class="map"></div>
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<span id="status">Try to click the line in the map.</span>
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<form class="form-inline">
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<label for="hitTolerance">Hit tolerance for selecting features: &nbsp;</label>
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<select id="hitTolerance" class="form-control">
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<option value="0" selected>0 Pixels</option>
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<option value="5">5 Pixels</option>
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<option value="10">10 Pixels</option>
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</select>
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&nbsp; Area: &nbsp;
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<canvas id="circle" style="vertical-align: middle" />
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</form>
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<script src="main.js"></script>
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</body>
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</html></code></pre>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">package.json</h5>
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<pre><code id="example-pkg-source" class="language-json">{
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"name": "hit-tolerance",
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"dependencies": {
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"ol": "6.5.0"
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},
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"devDependencies": {
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"parcel": "^2.0.0-beta.1"
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},
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"scripts": {
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"start": "parcel index.html",
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"build": "parcel build --public-url . index.html"
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}
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}</code></pre>
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</div>
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</div>
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<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
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<script src="./resources/prism/prism-1.20.0.min.js"></script>
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<script src="./resources/common.js"></script>
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<script src="common.js"></script>
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<script src="hit-tolerance.js"></script>
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<script>
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$('#tag-example-list').on('show.bs.modal', function (event) {
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const button = $(event.relatedTarget); // Button that triggered the modal
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const title = button.data('title');
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const content = button.data('content');
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const modal = $(this)
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modal.find('.modal-title').text(title);
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modal.find('.modal-body').html(content);
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});
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var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
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fetch(packageUrl).then(function(response) {
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return response.json();
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}).then(function(json) {
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var latestVersion = json.version;
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document.getElementById('latest-version').innerHTML = latestVersion;
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var url = window.location.href;
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var branchSearch = url.match(/\/([^\/]*)\/examples\//);
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var cookieText = 'dismissed=-' + latestVersion + '-';
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var dismissed = document.cookie.indexOf(cookieText) != -1;
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if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.5.0' != latestVersion) {
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var link = url.replace(branchSearch[0], '/latest/examples/');
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fetch(link, {method: 'head'}).then(function(response) {
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var a = document.getElementById('latest-link');
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a.href = response.status == 200 ? link : '../../latest/examples/';
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});
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var latestCheck = document.getElementById('latest-check');
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latestCheck.style.display = '';
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document.getElementById('latest-dismiss').onclick = function() {
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latestCheck.style.display = 'none';
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document.cookie = cookieText;
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}
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}
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});
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</script>
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</body>
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</html>
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