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628 lines
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628 lines
19 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Leaflet.VectorGrid API reference</title>
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<meta charset="utf-8">
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<!-- <link rel="stylesheet" href="http://www.leafletjs.com/docs/css/normalize.css" /> -->
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<link rel="stylesheet" href="main.css" />
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<script src="https://unpkg.com/highlight"></script>
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<!-- <link rel="stylesheet" href="http://www.leafletjs.com/docs/highlight/styles/github-gist.css" /> -->
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<!-- <link rel="stylesheet" href="http://www.leafletjs.com/docs/leaflet.css" /> -->
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<script src="leaflet.js"></script>
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</head>
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<body class='api-page'>
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<div class='container'>
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<h2>Leaflet.VectorGrid API reference</h2>
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<div id="toc" class="clearfix">
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<div class="toc-col map-col">
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<ul>
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<li><a href="#vectorgrid">VectorGrid</a></li>
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<li><a href="#vectorgrid-slicer">VectorGrid.Slicer</a></li>
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<li><a href="#vectorgrid-protobuf">VectorGrid.Protobuf</a></li>
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</ul>
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</div>
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<div class="toc-col map-col">
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<ul>
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<li><a href="#styling-vectorgrids">Styling VectorGrids</a></li>
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<li><a href="#updating-styles">Updating Styles</a></li>
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<li><a href="#interactivity">Interactivity</a></li>
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<li><a href="#svg-vs-canvas">SVG vs <code><canvas></code></a></li>
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</ul>
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</div>
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</div>
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<h2 id='vectorgrid-slicer'>VectorGrid.Slicer</h2><p>A <a href="#vectorgrid"><code>VectorGrid</code></a> for slicing up big GeoJSON or TopoJSON documents in vector
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tiles, leveraging <a href="https://github.com/mapbox/geojson-vt"><code>geojson-vt</code></a>.</p>
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<section>
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<h3 id='vectorgrid-slicer-example'>Usage example</h3>
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<section >
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<pre><code>var geoJsonDocument = {
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type: 'FeatureCollection',
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features: [ ... ]
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};
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L.vectorGrid.slicer(geoJsonDocument, {
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vectorTileLayerStyles: {
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sliced: { ... }
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}
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}).addTo(map);
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</code></pre><p><a href="#vectorgrid-slicer"><code>VectorGrid.Slicer</code></a> can also handle <a href="https://github.com/mbostock/topojson">TopoJSON</a> transparently:</p>
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<pre><code class="lang-js">var layer = L.vectorGrid.slicer(topojson, options);
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</code></pre>
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<p>The TopoJSON format <a href="https://github.com/mbostock/topojson-specification/blob/master/README.md#215-objects">implicitly groups features into "objects"</a>.
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These will be transformed into vector tile layer names when styling (the
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<code>vectorTileLayerName</code> option is ignored when using TopoJSON).</p>
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</section>
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</section><section>
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<h3 id='vectorgrid-slicer-option'>Options</h3>
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<section >
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<div class='section-comments'>Additionally to these options, <a href="#vectorgrid-slicer"><code>VectorGrid.Slicer</code></a> can take in any
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of the <a href="https://github.com/mapbox/geojson-vt#options"><code>geojson-vt</code> options</a>.</div>
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<table><thead>
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<tr>
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<th>Option</th>
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<th>Type</th>
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<th>Default</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='vectorgrid-slicer-vectortilelayername'>
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<td><code><b>vectorTileLayerName</b></code></td>
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<td><code>String</code>
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<td><code>'sliced'</code></td>
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<td>Vector tiles contain a set of <em>data layers</em>, and those data layers
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contain features. Thus, the slicer creates one data layer, with
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the name given in this option. This is important for symbolizing the data.</td>
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</tr>
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</tbody></table>
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</section>
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</section><h2 id='vectorgrid'>VectorGrid</h2><p>A <a href="#vectorgrid"><code>VectorGrid</code></a> is a generic, abstract class for displaying tiled vector data.
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it provides facilities for symbolizing and rendering the data in the vector
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tiles, but lacks the functionality to fetch the vector tiles from wherever
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they are.
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Extends Leaflet's <code>L.GridLayer</code>.</p>
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<section>
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<h3 id='vectorgrid-option'>Options</h3>
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<section >
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<table><thead>
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<tr>
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<th>Option</th>
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<th>Type</th>
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<th>Default</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='vectorgrid-rendererfactory'>
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<td><code><b>rendererFactory</b></code></td>
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<td><code></code>
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<td><code>L.svg.tile</code></td>
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<td>A factory method which will be used to instantiate the per-tile renderers.</td>
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</tr>
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<tr id='vectorgrid-vectortilelayerstyles'>
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<td><code><b>vectorTileLayerStyles</b></code></td>
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<td><code>Object</code>
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<td><code>{}</code></td>
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<td>A data structure holding initial symbolizer definitions for the vector features.</td>
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</tr>
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<tr id='vectorgrid-interactive'>
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<td><code><b>interactive</b></code></td>
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<td><code>Boolean</code>
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<td><code>false</code></td>
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<td>Whether this <a href="#vectorgrid"><code>VectorGrid</code></a> fires <code>Interactive Layer</code> events.</td>
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</tr>
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<tr id='vectorgrid-getfeatureid'>
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<td><code><b>getFeatureId</b></code></td>
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<td><code>Function</code>
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<td><code>undefined</code></td>
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<td>A function that, given a vector feature, returns an unique identifier for it, e.g.
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<code>function(feat) { return feat.properties.uniqueIdField; }</code>.
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Must be defined for <code>setFeatureStyle</code> to work.</td>
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</tr>
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</tbody></table>
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</section>
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</section><section>
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<h3 id='vectorgrid-method'>Methods</h3>
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<section >
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<table><thead>
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<tr>
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<th>Method</th>
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<th>Returns</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='vectorgrid-setfeaturestyle'>
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<td><code><b>setFeatureStyle</b>(<nobr><Number></nobr> <i>id</i>, <nobr><L.Path Options></nobr> <i>layerStyle</i>)</nobr></code></td>
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<td><code>this</code></td>
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<td><p>Given the unique ID for a vector features (as per the <code>getFeatureId</code> option),
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re-symbolizes that feature across all tiles it appears in.
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Reverts the effects of a previous <code>setFeatureStyle</code> call.</p>
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</td>
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</tr>
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<tr id='vectorgrid-getdatalayernames'>
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<td><code><b>getDataLayerNames</b>()</nobr></code></td>
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<td><code>Array</code></td>
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<td><p>Returns an array of strings, with all the known names of data layers in
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the vector tiles displayed. Useful for introspection.</p>
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</td>
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</tr>
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</tbody></table>
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</section><section class='collapsable'>
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<h4 id='vectorgrid-extension-methods'>Extension methods</h4>
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<div class='section-comments'>Classes inheriting from <a href="#vectorgrid"><code>VectorGrid</code></a> <strong>must</strong> define the <code>_getVectorTilePromise</code> private method.</div>
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<table><thead>
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<tr>
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<th>Method</th>
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<th>Returns</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='vectorgrid-getvectortilepromise'>
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<td><code><b>getVectorTilePromise</b>(<nobr><Object></nobr> <i>coords</i>)</nobr></code></td>
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<td><code>Promise</code></td>
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<td><p>Given a <code>coords</code> object in the form of <code>{x: Number, y: Number, z: Number}</code>,
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this function must return a <code>Promise</code> for a vector tile.</p>
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</td>
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</tr>
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</tbody></table>
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</section>
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</section><h2 id='fillsymbolizer'>FillSymbolizer</h2><p>A symbolizer for filled areas. Applies only to polygon features.</p>
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<h2 id='vectorgrid-protobuf'>VectorGrid.Protobuf</h2><p>A <a href="#vectorgrid"><code>VectorGrid</code></a> for vector tiles fetched from the internet.
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Tiles are supposed to be protobufs (AKA "protobuffer" or "Protocol Buffers"),
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containing data which complies with the
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<a href="https://github.com/mapbox/vector-tile-spec/tree/master/2.1">MapBox Vector Tile Specification</a>.
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This is the format used by:</p>
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<ul>
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<li>Mapbox Vector Tiles</li>
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<li>Mapzen Vector Tiles</li>
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<li>ESRI Vector Tiles</li>
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<li><a href="https://openmaptiles.com/hosting/">OpenMapTiles hosted Vector Tiles</a></li>
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</ul>
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<section>
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<h3 id='vectorgrid-protobuf-example'>Usage example</h3>
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<section >
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<p>You must initialize a <a href="#vectorgrid-protobuf"><code>VectorGrid.Protobuf</code></a> with a URL template, just like in
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<code>L.TileLayer</code>s. The difference is that the template must point to vector tiles
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(usually <code>.pbf</code> or <code>.mvt</code>) instead of raster (<code>.png</code> or <code>.jpg</code>) tiles, and that
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you should define the styling for all the features.
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<br><br>
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For OpenMapTiles, with a key from <a href="https://openmaptiles.org/docs/host/use-cdn/">https://openmaptiles.org/docs/host/use-cdn/</a>,
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initialization looks like this:</p>
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<pre><code>L.vectorGrid.protobuf("https://free-{s}.tilehosting.com/data/v3/{z}/{x}/{y}.pbf.pict?key={key}", {
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vectorTileLayerStyles: { ... },
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subdomains: "0123",
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key: 'abcdefghi01234567890',
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maxNativeZoom: 14
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}).addTo(map);
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</code></pre><p>And for Mapbox vector tiles, it looks like this:</p>
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<pre><code>L.vectorGrid.protobuf("https://{s}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/{z}/{x}/{y}.vector.pbf?access_token={token}", {
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vectorTileLayerStyles: { ... },
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subdomains: "abcd",
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token: "pk.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRTS.TUVWXTZ0123456789abcde"
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}).addTo(map);
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</code></pre>
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</section>
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</section><section>
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<h3 id='vectorgrid-protobuf-factory'>Creation</h3>
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<section >
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<table><thead>
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<tr>
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<th>Factory</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='vectorgrid-protobuf-l-vectorgrid-protobuf'>
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<td><code><b>L.vectorGrid.protobuf</b>(<nobr><String></nobr> <i>url</i>, <i>options</i>)</nobr></code></td>
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<td>Instantiates a new protobuf VectorGrid with the given URL template and options</td>
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</tr>
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</tbody></table>
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</section>
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</section><section>
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<h3 id='vectorgrid-protobuf-option'>Options</h3>
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<section >
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<div class='section-comments'>As with <code>L.TileLayer</code>, the URL template might contain a reference to
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any option (see the example above and note the <code>{key}</code> or <code>token</code> in the URL
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template, and the corresponding option).</div>
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<table><thead>
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<tr>
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<th>Option</th>
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<th>Type</th>
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<th>Default</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='vectorgrid-protobuf-subdomains'>
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<td><code><b>subdomains</b></code></td>
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<td><code>String</code>
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<td><code>'abc'</code></td>
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<td>Akin to the <code>subdomains</code> option for <code>L.TileLayer</code>.</td>
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</tr>
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</tbody></table>
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</section>
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</section><h2 id='linesymbolizer'>LineSymbolizer</h2><p>A symbolizer for lines. Can be applied to line and polygon features.</p>
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<h2 id='pointsymbolizer'>PointSymbolizer</h2><p>A symbolizer for points.</p>
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<h2 id='symbolizer'>Symbolizer</h2><p>The abstract Symbolizer class is mostly equivalent in concept to a <code>L.Path</code> - it's an interface for
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polylines, polygons and circles. But instead of representing leaflet Layers,
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it represents things that have to be drawn inside a vector tile.</p>
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<section>
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<h3 id='symbolizer-method'>Methods</h3>
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<section >
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<table><thead>
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<tr>
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<th>Method</th>
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<th>Returns</th>
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<th>Description</th>
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</tr>
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</thead><tbody>
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<tr id='symbolizer-initialize'>
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<td><code><b>initialize</b>(<nobr><GeoJSON></nobr> <i>feature</i>, <nobr><Number></nobr> <i>pxPerExtent</i>)</nobr></code></td>
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<td><code></code></td>
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<td><p>Initializes a new Line Symbolizer given a GeoJSON feature and the
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pixel-to-coordinate-units ratio. Internal use only.</p>
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</td>
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</tr>
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<tr id='symbolizer-render'>
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<td><code><b>render</b>(<i>renderer</i>, <i>style</i>)</nobr></code></td>
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<td><code></code></td>
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<td><p>Renders this symbolizer in the given tiled renderer, with the given
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<code>L.Path</code> options. Internal use only.
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Updates the <code>L.Path</code> options used to style this symbolizer, and re-renders it.
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Internal use only.</p>
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</td>
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</tr>
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</tbody></table>
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</section>
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</section><h2 id='styling-vectorgrids'>Styling VectorGrids</h2><p>Vector tiles have a concept of "layer" different from the Leaflet concept of "layer".
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<br>
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In Leaflet, a "layer" is something that can be atomically added or removed from the map. In vector tiles, a "layer" is a named set of features (points, lines or polygons) which share a common theme.
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<br>
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A vector tile layer¹ can have several layers². In the <code>mapbox-streets-v6</code> vector tiles layer¹ above, there are named layers² like <code>admin</code>, <code>water</code> or <code>roads</code>.
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<br>
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(¹ In Leaflet)
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<br>
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(² Groups of themed features)
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<br>
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Styling is done via per-layer² sets of <code>L.Path</code> options in the <code>vectorTileLayerStyles</code> layer¹ option:</p>
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<pre><code class="lang-js">var vectorTileOptions = {
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vectorTileLayerStyles: {
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// A plain set of L.Path options.
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water: {
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weight: 0,
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fillColor: '#9bc2c4',
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fillOpacity: 1,
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fill: true
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},
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// A function for styling features dynamically, depending on their
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// properties and the map's zoom level
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admin: function(properties, zoom) {
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var level = properties.admin_level;
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var weight = 1;
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if (level == 2) {weight = 4;}
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return {
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weight: weight,
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color: '#cf52d3',
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dashArray: '2, 6',
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fillOpacity: 0
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}
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},
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// An 'icon' option means that a L.Icon will be used
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place: {
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icon: new L.Icon.Default()
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},
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road: []
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}
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};
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var pbfLayer = L.vectorGrid.protobuf(url, vectorTileOptions).addTo(map);
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</code></pre>
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<p>A layer² style can be either:</p>
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<ul>
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<li>A set of <code>L.Path</code> options</li>
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<li>An array of sets of <code>L.Path</code> options</li>
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<li>A function that returns a set of <code>L.Path</code> options</li>
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<li>A function that returns an array of sets of <code>L.Path</code> options
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<br>
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Layers² with no style specified will use the default <code>L.Path</code> options.
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<br>
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Polylines and polygons can be styled exactly like normal Leaflet <code>L.Path</code>s, points can be styled like polygons using <code>L.CircleMarker</code>s or <code>L.Icon</code>s.</li>
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</ul>
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<h2 id='updating-styles'>Updating Styles</h2><p>In some cases it can be desirable to change the style of a feature on screen, for example for highlighting when a feature is clicked.
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<br>
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To do this, VectorGrid needs to know how to identify a feature. This is done through the <code>getFeatureId</code> option, which should be set to a function
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that returns an id given a feature as argument. For example:</p>
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<pre><code class="lang-js">var vectorGrid = L.vectorGrid.slicer(url, {
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...
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getFeatureId: function(f) {
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return f.properties.osm_id;
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}
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}
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</code></pre>
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<p>Note that features with the same id will be treated as one when changing style, this happens normally when for example a polygon spans more than one tile.
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<br>
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To update the style of a feature, use <code>setFeatureStyle</code>:</p>
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<pre><code class="lang-js">vectorGrid.setFeatureStyle(id, style);
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</code></pre>
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<p>The styling follows the same rules as described above, it accepts a single style, an array, or a function that returns styling.
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<br>
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To revert the style to the layer's default, use the <code>resetFeatureStyle</code> method:</p>
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<pre><code class="lang-js">vectorGrid.resetFeatureStyle(id);
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</code></pre>
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<h2 id='interactivity'>Interactivity</h2><p>You can enable interacting (click, mouseover, etc.) with layer features if you pass the option <code>interactive: true</code>; you can then add listeners to the VectorGrid layer. When
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an event fires, it will include the <code>layer</code> property, containing information about the feature.</p>
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<h2 id='svg-vs-canvas'>SVG vs canvas</h2><p>Leaflet.VectorGrid is able to render vector tiles with both SVG and <code><canvas></code>, in the same way that vanilla Leaflet can use SVG and <code><canvas></code> to draw lines and polygons.
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<br>
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To switch between the two, use the <code>rendererFactory</code> option for any <code>L.VectorGrid</code> layer, e.g.:</p>
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<pre><code class="lang-js">var sliced = L.vectorGrid.slicer(geojson, {
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rendererFactory: L.svg.tile,
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attribution: 'Something',
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vectorTileLayerStyles: { ... }
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|
});
|
|
var pbf = L.vectorGrid.protobuf(url, {
|
|
rendererFactory: L.canvas.tile,
|
|
attribution: 'Something',
|
|
vectorTileLayerStyles: { ... }
|
|
});
|
|
</code></pre>
|
|
<p>Internally, Leaflet.VectorGrid uses two classes named <code>L.SVG.Tile</code> and <code>L.Canvas.Tile</code>, with factory methods <code>L.svg.tile</code> and <code>L.canvas.tile</code> - a <code>L.VectorGrid</code> needs to be passed one of those factory methods.</p>
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|
|
|
|
|
|
|
<div class="footer">
|
|
<p>© 2016-2017 Iván Sánchez Ortega, Per Liedman.</p>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
<!-- <script src="http://leafletjs.com/docs/js/docs.js"></script> -->
|
|
<script>
|
|
hljs.configure({tabReplace: ' '});
|
|
hljs.initHighlightingOnLoad();
|
|
|
|
var elems = document.querySelectorAll('h2, h3, h4, tr');
|
|
|
|
for (var i = 0, len = elems.length; i < len; i++) {
|
|
var el = elems[i];
|
|
|
|
if (el.id) {
|
|
var anchor = document.createElement('a');
|
|
anchor.setAttribute('anchor', el.id);
|
|
if (!el.children.length) {
|
|
// For headers, insert the anchor before.
|
|
el.parentNode.insertBefore(anchor, el);
|
|
} else {
|
|
// For table rows, insert the anchor inside the first <td>
|
|
el.querySelector('td').appendChild(anchor);
|
|
|
|
// Clicking on the row (meaning "the link icon on the ::before)
|
|
// jumps to the item
|
|
el.parentNode.onclick = function(hash){
|
|
return function(ev) {
|
|
if (ev.offsetX < 0) {
|
|
window.location.hash = '#' + ev.target.parentNode.id;
|
|
}
|
|
};
|
|
}(el.id);
|
|
}
|
|
}
|
|
}
|
|
|
|
elems = document.querySelectorAll('div.accordion');
|
|
for (var i = 0, len = elems.length; i < len; i++) {
|
|
var el = elems[i];
|
|
|
|
el.querySelector('label').addEventListener('click', function(c){
|
|
return function() {
|
|
if (c.className === 'accordion expanded') {
|
|
c.className = 'accordion collapsed';
|
|
} else {
|
|
c.className = 'accordion expanded';
|
|
}
|
|
};
|
|
}(el));
|
|
|
|
// el.className = 'accordion collapsed';
|
|
// el.querySelector('.accordion-content').style.display = 'none';
|
|
}
|
|
|
|
</script>
|
|
<style>
|
|
|
|
h2 {
|
|
margin-top: 2em;
|
|
}
|
|
|
|
h3 {
|
|
margin-top: 1em;
|
|
margin-bottom: .5em;
|
|
}
|
|
|
|
div.accordion {
|
|
width: 100%;
|
|
/* overflow: hidden; */
|
|
}
|
|
|
|
div.accordion-overflow {
|
|
width: 100%;
|
|
overflow: hidden;
|
|
}
|
|
|
|
label,
|
|
section > h4 {
|
|
display: block;
|
|
font-weight: 500;
|
|
margin: 1em 0 0.25em;
|
|
}
|
|
|
|
label {
|
|
cursor: pointer;
|
|
}
|
|
|
|
div.accordion > div.accordion-overflow > div.accordion-content {
|
|
max-height: 0;
|
|
display: none;
|
|
}
|
|
|
|
div.accordion.collapsed > div.accordion-overflow > div.accordion-content {
|
|
animation-duration: 0.4s;
|
|
animation-name: collapse;
|
|
/* height: 0; */
|
|
max-height: 0;
|
|
display: block;
|
|
overflow: hidden;
|
|
}
|
|
|
|
div.accordion.expanded > div.accordion-overflow > div.accordion-content {
|
|
animation-duration: 0.4s;
|
|
animation-name: expand;
|
|
/* height: auto; */
|
|
max-height: none;
|
|
display: block;
|
|
}
|
|
|
|
@keyframes collapse {
|
|
0% { max-height: 100vh; }
|
|
100% { max-height: 0; }
|
|
}
|
|
|
|
@keyframes expand {
|
|
0% { max-height: 0; }
|
|
100% { max-height: 100vh; }
|
|
}
|
|
|
|
/* div.accordion > div.accordion-content {
|
|
transition: max-height 0.4s ease-out 0s;
|
|
}*/
|
|
|
|
div.accordion.expanded > label > span.expander {
|
|
transform: rotate(90deg);
|
|
}
|
|
|
|
div.accordion > label > span.expander {
|
|
transition: transform 0.4s ease-out 0s;
|
|
display: inline-block;
|
|
font-size: 12px;
|
|
}
|
|
|
|
|
|
table {
|
|
margin-bottom: 0;
|
|
}
|
|
|
|
/* Markdown renders some spurious <p>s inside the table cells */
|
|
td > p {
|
|
margin:0;
|
|
}
|
|
|
|
/* This just looks bad (with the current grey headers for sections which Vlad doesn't really like, so might have to change this) */
|
|
section.collapsable > div.section-comments > p {
|
|
margin:0;
|
|
}
|
|
|
|
div.section-comments {
|
|
margin-bottom: 0.25em;
|
|
}
|
|
|
|
/* section.collapsable div.section-comments {
|
|
margin: 1em;
|
|
font-size: 12px;
|
|
}*/
|
|
|
|
section.collapsable pre {
|
|
margin:0;
|
|
}
|
|
|
|
section {
|
|
margin-left: 0.5em;
|
|
}
|
|
|
|
section h4, section.collapsable h4 {
|
|
margin-left: -0.5em;
|
|
}
|
|
|
|
|
|
|
|
</style>
|
|
</body></html>
|