Add a d3 example
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Éric Lemoine
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<!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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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="../resources/layout.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
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<title>d3 integration example</title>
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</head>
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<body>
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<div class="navbar navbar-inverse navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="./">OpenLayers 3 Examples</a>
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<ul class="nav pull-right">
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<li><iframe class="github-watch-button" src="http://ghbtns.com/github-btn.html?user=openlayers&repo=ol3&type=watch&count=true"
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allowtransparency="true" frameborder="0" scrolling="0" height="20" width="90"></iframe></li>
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<li><a href="https://twitter.com/share" class="twitter-share-button" data-count="none" data-hashtags="openlayers"> </a></li>
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<li><div class="g-plusone-wrapper"><div class="g-plusone" data-size="medium" data-annotation="none"></div></div></li>
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</ul>
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</div>
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</div>
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</div>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">d3 integration example</h4>
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<p id="shortdesc">Example of using ol3 and d3 together.</p>
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<div id="docs">
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<p>The example loads TopoJSON geometries and uses d3 (<code>d3.geo.path</code>) to render these geometries to a canvas element that is then used as the image of an ol3 image layer.</p>
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<p>See the <a href="d3.js" target="_blank">d3.js source</a> to see how this is done.</p>
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</div>
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<div id="tags">d3</div>
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</div>
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</div>
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</div>
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<script src="http://d3js.org/d3.v3.min.js"></script>
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<script src="http://d3js.org/topojson.v1.min.js"></script>
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<script src="loader.js?id=d3" type="text/javascript"></script>
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<script src="../resources/social-links.js" type="text/javascript"></script>
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</body>
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</html>
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Vendored
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// NOCOMPILE
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// this example uses d3 for which we don't have an externs file.
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goog.require('ol');
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goog.require('ol.Map');
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goog.require('ol.View2D');
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goog.require('ol.extent');
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goog.require('ol.layer.Image');
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goog.require('ol.layer.Tile');
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goog.require('ol.proj');
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goog.require('ol.source.ImageCanvas');
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goog.require('ol.source.Stamen');
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var map = new ol.Map({
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layers: [
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new ol.layer.Tile({
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source: new ol.source.Stamen({
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layer: 'watercolor'
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})
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})
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],
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renderers: ['canvas'],
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target: 'map',
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view: new ol.View2D({
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center: ol.proj.transform([-97, 38], 'EPSG:4326', 'EPSG:3857'),
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zoom: 4
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})
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});
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/**
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* Load the topojson data and create an ol.layer.Image for that data.
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*/
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d3.json('data/us.json', function(error, us) {
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var features = topojson.feature(us, us.objects.counties);
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/**
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* This function uses d3 to render the topojson features to a canvas.
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* @param {ol.Extent} extent Extent.
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* @param {number} resolution Resolution.
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* @param {ol.Size} size Size.
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* @param {ol.proj.Projection} projection Projection.
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* @return {HTMLCanvasElement}
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*/
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var canvasFunction = function(extent, resolution, size, projection) {
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var canvasWidth = size[0];
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var canvasHeight = size[1];
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var canvas = d3.select(document.createElement('canvas'));
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canvas.attr('width', canvasWidth).attr('height', canvasHeight);
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var context = canvas.node().getContext('2d');
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var d3Projection = d3.geo.mercator().scale(1).translate([0, 0]);
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var d3Path = d3.geo.path().projection(d3Projection);
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var pixelBounds = d3Path.bounds(features);
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var pixelBoundsWidth = pixelBounds[1][0] - pixelBounds[0][0];
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var pixelBoundsHeight = pixelBounds[1][1] - pixelBounds[0][1];
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var geoBounds = d3.geo.bounds(features);
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var geoBoundsLeftBottom = ol.proj.transform(
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geoBounds[0], 'EPSG:4326', projection);
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var geoBoundsRightTop = ol.proj.transform(
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geoBounds[1], 'EPSG:4326', projection);
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var geoBoundsWidth = geoBoundsRightTop[0] - geoBoundsLeftBottom[0];
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if (geoBoundsWidth < 0) {
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geoBoundsWidth += ol.extent.getWidth(projection.getExtent());
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}
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var geoBoundsHeight = geoBoundsRightTop[1] - geoBoundsLeftBottom[1];
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var widthResolution = geoBoundsWidth / pixelBoundsWidth;
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var heightResolution = geoBoundsHeight / pixelBoundsHeight;
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var r = Math.max(widthResolution, heightResolution);
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var scale = r / (resolution / pixelRatio);
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var center = ol.proj.transform(ol.extent.getCenter(extent),
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projection, 'EPSG:4326');
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d3Projection.scale(scale).center(center)
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.translate([canvasWidth / 2, canvasHeight / 2]);
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d3Path = d3Path.projection(d3Projection).context(context);
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d3Path(features);
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context.stroke();
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return canvas[0][0];
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};
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var layer = new ol.layer.Image({
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source: new ol.source.ImageCanvas({
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canvasFunction: canvasFunction,
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projection: 'EPSG:3857'
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})
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});
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map.addLayer(layer);
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});
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