| 1 | <!DOCTYPE html> |
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| 2 | <html> |
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| 3 | <head> |
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| 4 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
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| 5 | <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> |
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| 6 | <meta name="apple-mobile-web-app-capable" content="yes"> |
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| 7 | <title>OpenLayers BBOX Strategy Example</title> |
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| 8 | <link rel="stylesheet" href="../theme/default/style.css" type="text/css"> |
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| 9 | <link rel="stylesheet" href="style.css" type="text/css"> |
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| 10 | <script src="../lib/OpenLayers.js"></script> |
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| 11 | <script type="text/javascript"> |
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| 12 | var map, photos; |
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| 13 | |
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| 14 | /** |
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| 15 | * A specific format for parsing Flickr API JSON responses. |
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| 16 | */ |
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| 17 | OpenLayers.Format.Flickr = OpenLayers.Class(OpenLayers.Format, { |
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| 18 | read: function(obj) { |
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| 19 | if(obj.stat === 'fail') { |
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| 20 | throw new Error( |
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| 21 | ['Flickr failure response (', |
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| 22 | obj.code, |
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| 23 | '): ', |
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| 24 | obj.message].join('')); |
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| 25 | } |
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| 26 | if(!obj || !obj.photos || |
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| 27 | !OpenLayers.Util.isArray(obj.photos.photo)) { |
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| 28 | throw new Error( |
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| 29 | 'Unexpected Flickr response'); |
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| 30 | } |
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| 31 | var photos = obj.photos.photo, photo, |
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| 32 | x, y, point, |
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| 33 | feature, features = []; |
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| 34 | for(var i=0,l=photos.length; i<l; i++) { |
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| 35 | photo = photos[i]; |
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| 36 | x = photo.longitude; |
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| 37 | y = photo.latitude; |
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| 38 | point = new OpenLayers.Geometry.Point(x, y); |
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| 39 | feature = new OpenLayers.Feature.Vector(point, { |
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| 40 | title: photo.title, |
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| 41 | img_url: photo.url_s |
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| 42 | }); |
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| 43 | features.push(feature); |
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| 44 | } |
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| 45 | return features; |
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| 46 | } |
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| 47 | }); |
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| 48 | |
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| 49 | function init() { |
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| 50 | map = new OpenLayers.Map('map'); |
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| 51 | |
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| 52 | var base = new OpenLayers.Layer.OSM(); |
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| 53 | |
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| 54 | var style = new OpenLayers.Style({ |
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| 55 | externalGraphic: "${img_url}", |
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| 56 | pointRadius: 30 |
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| 57 | }); |
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| 58 | |
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| 59 | photos = new OpenLayers.Layer.Vector("Photos", { |
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| 60 | projection: "EPSG:4326", |
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| 61 | strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1})], |
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| 62 | protocol: new OpenLayers.Protocol.Script({ |
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| 63 | url: "http://api.flickr.com/services/rest", |
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| 64 | params: { |
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| 65 | api_key: 'b5e8c0e287e678671c3d8b2c0f3ced85', |
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| 66 | format: 'json', |
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| 67 | method: 'flickr.photos.search', |
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| 68 | extras: 'geo,url_s', |
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| 69 | per_page: 10, |
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| 70 | page: 1 |
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| 71 | }, |
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| 72 | callbackKey: 'jsoncallback', |
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| 73 | format: new OpenLayers.Format.Flickr() |
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| 74 | }), |
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| 75 | styleMap: new OpenLayers.StyleMap(style) |
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| 76 | }); |
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| 77 | |
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| 78 | map.addLayers([base, photos]); |
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| 79 | map.setCenter( |
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| 80 | new OpenLayers.LonLat(-567468.5392481, |
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| 81 | 4950672.5471436), 5); |
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| 82 | } |
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| 83 | |
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| 84 | </script> |
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| 85 | </head> |
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| 86 | <body onload="init()"> |
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| 87 | <h1 id="title">BBOX Strategy Example</h1> |
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| 88 | <div id="tags"> |
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| 89 | vector, feature, stylemap, bbox, strategy, script, flickr |
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| 90 | </div> |
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| 91 | <p id="shortdesc"> |
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| 92 | Uses a BBOX strategy to request features within a bounding box. |
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| 93 | </p> |
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| 94 | <div id="map" class="smallmap"></div> |
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| 95 | <div id="docs"> |
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| 96 | <p>The BBOX strategy requests data within a bounding box. When the |
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| 97 | previously requested data bounds are invalidated (by browsing to |
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| 98 | some area not covered by those bounds), another request for data |
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| 99 | is issued.</p> |
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| 100 | |
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| 101 | <p>This particular example uses the <a |
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| 102 | href="http://www.flickr.com/services/api/">Flickr API.</a></p> |
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| 103 | |
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| 104 | </div> |
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| 105 | </body> |
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| 106 | </html> |
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