107 lines
4.3 KiB
HTML
107 lines
4.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>OpenLayers BBOX Strategy Example</title>
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
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<link rel="stylesheet" href="style.css" type="text/css">
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<script src="../lib/OpenLayers.js"></script>
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<script type="text/javascript">
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var map, photos;
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/**
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* A specific format for parsing Flickr API JSON responses.
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*/
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OpenLayers.Format.Flickr = OpenLayers.Class(OpenLayers.Format, {
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read: function(obj) {
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if(obj.stat === 'fail') {
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throw new Error(
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['Flickr failure response (',
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obj.code,
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'): ',
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obj.message].join(''));
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}
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if(!obj || !obj.photos ||
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!OpenLayers.Util.isArray(obj.photos.photo)) {
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throw new Error(
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'Unexpected Flickr response');
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}
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var photos = obj.photos.photo, photo,
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x, y, point,
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feature, features = [];
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for(var i=0,l=photos.length; i<l; i++) {
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photo = photos[i];
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x = photo.longitude;
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y = photo.latitude;
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point = new OpenLayers.Geometry.Point(x, y);
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feature = new OpenLayers.Feature.Vector(point, {
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title: photo.title,
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img_url: photo.url_s
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});
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features.push(feature);
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}
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return features;
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}
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});
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function init() {
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map = new OpenLayers.Map('map');
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var base = new OpenLayers.Layer.OSM();
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var style = new OpenLayers.Style({
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externalGraphic: "${img_url}",
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pointRadius: 30
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});
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photos = new OpenLayers.Layer.Vector("Photos", {
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projection: "EPSG:4326",
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strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1})],
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protocol: new OpenLayers.Protocol.Script({
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url: "http://api.flickr.com/services/rest",
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params: {
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api_key: 'b5e8c0e287e678671c3d8b2c0f3ced85',
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format: 'json',
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method: 'flickr.photos.search',
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extras: 'geo,url_s',
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per_page: 10,
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page: 1
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},
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callbackKey: 'jsoncallback',
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format: new OpenLayers.Format.Flickr()
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}),
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styleMap: new OpenLayers.StyleMap(style)
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});
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map.addLayers([base, photos]);
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map.setCenter(
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new OpenLayers.LonLat(-567468.5392481,
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4950672.5471436), 5);
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}
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</script>
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</head>
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<body onload="init()">
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<h1 id="title">BBOX Strategy Example</h1>
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<div id="tags">
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vector, feature, stylemap, bbox, strategy, script, flickr
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</div>
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<p id="shortdesc">
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Uses a BBOX strategy to request features within a bounding box.
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</p>
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<div id="map" class="smallmap"></div>
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<div id="docs">
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<p>The BBOX strategy requests data within a bounding box. When the
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previously requested data bounds are invalidated (by browsing to
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some area not covered by those bounds), another request for data
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is issued.</p>
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<p>This particular example uses the <a
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href="http://www.flickr.com/services/api/">Flickr API.</a></p>
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</div>
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</body>
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</html>
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