mirror of
https://github.com/Viglino/ol-ext.git
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120 lines
4.1 KiB
HTML
120 lines
4.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<!--
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Copyright (c) 2016-2018 Jean-Marc VIGLINO,
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released under CeCILL-B (french BSD like) licence: http://www.cecill.info/
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-->
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<title>ol-ext: Snap guides interaction</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="description" content="an Openlayers interaction to draw regular polygon" />
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<meta name="keywords" content="openlayers, interaction, draw, regular, polygon, snap, guide, square" />
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<link rel="stylesheet" href="../style.css" />
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<!-- jQuery -->
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<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.0.min.js"></script>
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<!-- FontAwesome -->
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
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<!-- Openlayers -->
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@latest/ol.css" />
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<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/ol@latest/dist/ol.js"></script>
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<!-- ol-ext -->
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<link rel="stylesheet" href="../../dist/ol-ext.css" />
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<script type="text/javascript" src="../../dist/ol-ext.js"></script>
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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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</head>
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<body >
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<a href="https://github.com/Viglino/ol-ext" class="icss-github-corner"><i></i></a>
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<a href="../../index.html">
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<h1>ol-ext: Snap guides interaction</h1>
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</a>
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<div class="info">
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<b>ol.interaction.SnapGuide</b> handles snapping of vector features using guides lines while modifying or drawing them.
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<br/>
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The snap interaction modifies map browser event coordinate and pixel properties to force the snap to occur
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to any interaction that them.
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<ul>
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<li>
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You can add guidelines to snap to.
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</li><li>
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You can set an <i>ol.interaction.Draw</i> (setDrawInteraction)to control orthogonal drawing (similar to <a href="https://github.com/geops/ole">OLE snapping</a> with OL2).
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</li><li>
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You can also set an <i>ol.interaction.Modify</i> (setModifyInteraction) to control orthogonal drawing while modifying.
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</li><li>
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<b>With ol6</b> use <i>ol/layer/VectorImage</i> class as <i>vectorClass</i> options to enhance drawing performances.
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</li>
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</ul>
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</div>
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<!-- Map div -->
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<div id="map" style="width:600px; height:400px;"></div>
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<div class="options" >
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<h2>Options:</h2>
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<ul><li>
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<label><input type="checkbox" onchange="setInitial(this.checked)" /> use initial guides</label>
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</li></ul>
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<button onclick="addMeridian(0)">Add a Greenwich origin guideline</button>
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</div>
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<script type="text/javascript">
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// Layers
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var layers = [ new ol.layer.Tile({ source: new ol.source.OSM() }) ];
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// The map
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var map = new ol.Map ({
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target: 'map',
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view: new ol.View ({
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zoom: 17,
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center: [0, 6713891]
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}),
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layers: layers
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});
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// New vector layer
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var vector = new ol.layer.Vector({
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name: 'Vecteur',
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source: new ol.source.Vector({ features: new ol.Collection() }),
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})
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map.addLayer(vector);
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var drawi = new ol.interaction.Draw({
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source: vector.getSource(),
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//type: "LineString"
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type: "Polygon"
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});
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map.addInteraction(drawi);
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var modi = new ol.interaction.ModifyFeature({ source: vector.getSource() });
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map.addInteraction(modi);
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var snapi = new ol.interaction.SnapGuides({
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vectorClass: ol.layer.VectorImage
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});
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snapi.setDrawInteraction(drawi);
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snapi.setModifyInteraction(modi);
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map.addInteraction(snapi);
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// New guide on meridian (default Greenwich)
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function addMeridian (x) {
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var p1 = ol.proj.transform([x||0,1], 'EPSG:4326', map.getView().getProjection());
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var p2 = ol.proj.transform([x||0,-1], 'EPSG:4326', map.getView().getProjection());
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snapi.addGuide([ p1, p2 ]);
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};
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// Switch initial condition
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function setInitial (b) {
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snapi.enableInitialGuides_ = b;
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};
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</script>
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</body>
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</html> |