JA:Openlayers Track example

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Contents

はじめに

この例は、一つまたは複数の GPX トラックを OpenLayers 地図に表示する方法を示します。

この例は OpenLayers Simple Example を基にしています。

説明

必要なもの

手順

<html>
<head>
	<title>Simple OSM GPX Track</title>
	<!-- bring in the OpenLayers javascript library
		 (here we bring it from the remote site, but you could
		 easily serve up this javascript yourself) -->
	<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
	<!-- bring in the OpenStreetMap OpenLayers layers.
		 Using this hosted file will make sure we are kept up
		 to date with any necessary changes -->
	<script src="http://www.openstreetmap.org/openlayers/OpenStreetMap.js"></script>
 
	<script type="text/javascript">
		// Start position for the map (hardcoded here for simplicity,
		// but maybe you want to get this from the URL params)
		var lat=47.496792
		var lon=7.571726
		var zoom=13
 
		var map; //complex object of type OpenLayers.Map
 
		function init() {
			map = new OpenLayers.Map ("map", {
				controls:[
					new OpenLayers.Control.Navigation(),
					new OpenLayers.Control.PanZoomBar(),
					new OpenLayers.Control.LayerSwitcher(),
					new OpenLayers.Control.Attribution()],
				maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
				maxResolution: 156543.0399,
				numZoomLevels: 19,
				units: 'm',
				projection: new OpenLayers.Projection("EPSG:900913"),
				displayProjection: new OpenLayers.Projection("EPSG:4326")
			} );
 
			// Define the map layer
			// Here we use a predefined layer that will be kept up to date with URL changes
			layerMapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik");
			map.addLayer(layerMapnik);
// removed		layerTilesAtHome = new OpenLayers.Layer.OSM.Osmarender("Osmarender");
// removed		map.addLayer(layerTilesAtHome);
			layerCycleMap = new OpenLayers.Layer.OSM.CycleMap("CycleMap");
			map.addLayer(layerCycleMap);
			layerMarkers = new OpenLayers.Layer.Markers("Markers");
			map.addLayer(layerMarkers);
 
			// Add the Layer with the GPX Track
			var lgpx = new OpenLayers.Layer.GML("Lakeside cycle ride", "around_lake.gpx", {
				format: OpenLayers.Format.GPX,
				style: {strokeColor: "green", strokeWidth: 5, strokeOpacity: 0.5},
				projection: new OpenLayers.Projection("EPSG:4326")
			});
			map.addLayer(lgpx);
 
			var lonLat = new OpenLayers.LonLat(lon, lat).transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());
			map.setCenter(lonLat, zoom);
 
			var size = new OpenLayers.Size(21, 25);
			var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);
			var icon = new OpenLayers.Icon('http://www.openstreetmap.org/openlayers/img/marker.png',size,offset);
			layerMarkers.addMarker(new OpenLayers.Marker(lonLat,icon));
		}
	</script>
 
</head>
<!-- body.onload is called once the page is loaded (call the 'init' function) -->
<body onload="init();">
	<!-- define a DIV into which the map will appear. Make it take up the whole window -->
	<div style="width:90%; height:90%" id="map"></div>
</body>
</html>

カスタマイズ

基本的な例がブラウザで動作したら、あなたのニーズに適応させるためにウェブページを変更します。

  • HTML ファイルをテキストエディタで開いて、以下の行を変更します:
// Start position for the map (hardcoded here for simplicity
// but maybe you want to get this from the URL params)
var lat=47.496792
var lon=7.571726
var zoom=13
  • HTML ファイルをテキストエディタで開いて、以下の行を変更します:
// Add the Layer with GPX Track
var lgpx = new OpenLayers.Layer.GML("Lakeside cycle ride", "around_lake.gpx", {
      format: OpenLayers.Format.GPX,
      style: {strokeColor: "green", strokeWidth: 5, strokeOpacity: 0.5},
      projection: new OpenLayers.Projection("EPSG:4326")
});

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