1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>OpenLayers Layer Load Monitoring Example</title> <link rel="stylesheet" href="../theme/default/style.css" type="text/css" /> <link rel="stylesheet" href="style.css" type="text/css" /> <style type="text/css"> #controls { float: left; text-align: right; } #eventsLogID { text-align: left; width: 350px; height: 475px; overflow: auto; border: 1px solid black; } </style> <script src="../lib/Firebug/firebug.js"></script> <script src="../lib/OpenLayers.js"></script> <script type="text/javascript"> var lon = 5; var lat = 40; var zoom = 5; var map, layer; function init(){ eventsLog = OpenLayers.Util.getElement("eventsLogID"); map = new OpenLayers.Map( 'map' ); map.addControl(new OpenLayers.Control.LayerSwitcher()); buffer0 = new OpenLayers.Layer.WMS( "WMS Buffer 0", "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} , { singleTile: false, buffer:0} ); registerEvents(buffer0); buffer1 = new OpenLayers.Layer.WMS( "WMS Buffer 1", "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} , { singleTile: false, buffer:1} ); registerEvents(buffer1); buffer2 = new OpenLayers.Layer.WMS( "WMS Buffer 2", "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} , { singleTile: false, buffer:2 } ); registerEvents(buffer2); singleTileLayer = new OpenLayers.Layer.WMS( "Single Tile Layer", "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} , { singleTile: true} ); registerEvents(singleTileLayer); map.setCenter(new OpenLayers.LonLat(lon, lat), zoom); } function registerEvents(layer) { layer.logEvent = function(event) { eventsLog.innerHTML += "<br>(" + getTimeStamp() + ") " + this.name + ": " + event; } layer.events.register("loadstart", layer, function() { this.logEvent("Load Start"); }); layer.events.register("tileloaded", layer, function() { this.logEvent("Tile loaded. " + this.numLoadingTiles + " left."); }); layer.events.register("loadend", layer, function() { this.logEvent("Load End. Grid:" + this.grid.length + "x" + this.grid[0].length); }); map.addLayer(layer); } function getTimeStamp() { var date = new Date(); var timeParts = [ date.getHours(), date.getMinutes(), date.getSeconds() ]; var timeStamp = timeParts.join(":"); return timeStamp; } function clearLog() { eventsLog.innerHTML = "<b>Events Log:</b>"; } </script> </head> <body onload="init()"> <h1 id="title">Layer Load Monitoring Example</h1> <div id="tags"></div> <p id="shortdesc"> Demonstrate a method for monitoring tile loading performance. </p> <div id="map" style="float:left;"></div> <div id="controls"> <div id="eventsLogID"> <b>Events Log:</b> </div> <input type="button" value="Clear" onclick="clearLog()"/> </div> <div id="docs"> </div> </body> </html> |