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#1 Wed 12 May 2010 17:21
- Squid
- Participant actif
- Date d'inscription: 2 Apr 2010
- Messages: 109
[OpenLayers] Modification script et convertion GML en SVG
Bonjour,
Je suis étudiant. J'ai à réaliser un projet en webmapping qui consiste à convertir les informations d'une carte affichées grâce au webmapping en fichier SVG.
J'ai trouvé un exemple d'openLayers qui possède cette fonction : http://openlayers.org/dev/examples/osm-layer.html
Le script est le suivant :
Code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>OpenLayers: OSM Layer</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
<link rel="stylesheet" href="style.css" type="text/css" />
<style>
#map {
height: 350px;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var lon = 5;
var lat = 40;
var zoom = 5;
var map, layer, gml;
function export_vectors() {
var x = new OpenLayers.Format.XML();
var content = x.write(gml.renderer.rendererRoot);
$("vectors").value = content;
$("vectors").style.display = "block";
$("vectorlink").href = "data:image/svg+xml," + escape(content);
$("vectorlink").style.display="block";
}
function on_feature_hover(feature) {
var text ="<ul>";
var type ="way";
if (feature.geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
type = "node";
}
text += "<li>" + feature.osm_id + ": <a href='http://crschmidt.net/osm/attributes.html?type="+type+"&id="+feature.osm_id+"'>Edit</a>, <a href='http://www.openstreetmap.org/api/0.5/"+type + "/" + feature.osm_id + "'>API</a></li>";
for (var key in feature.attributes) {
text += "<li>" + key + ": " + feature.attributes[key] + "</li>";
}
text += "</ul>";
$("status").innerHTML = text;
}
function clear_data() {
gml.destroyFeatures();
}
function new_data() {
if (!check_zoom()) { return; }
clear_data();
gml.loaded = false;
gml.url = "http://www.openstreetmap.org/api/0.5/map?bbox=" + map.getExtent().toBBOX();
$("status").innerHTML = "Loading more data...";
gml.loadGML();
}
function style_osm_feature(feature) {
feature.style = OpenLayers.Util.extend({'fill':'black'}, OpenLayers.Feature.Vector.style['default']);
if (feature.attributes.highway == "motorway") {
feature.style.strokeColor = "blue";
feature.style.strokeWidth = 5;
} else if (feature.attributes.highway == "primary") {
feature.style.strokeColor = "red";
} else if (feature.attributes.highway == "secondary") {
feature.style.strokeColor = "orange";
} else if (feature.attributes.highway) {
feature.style.strokeColor = "black";
}
}
function check_zoom() {
var zoom = map.getZoom();
if (zoom >= 11) { return true; }
if (zoom >= 9) { return confirm("Loading this amount of data may slow your browser. Are you sure you want to do this?"); }
$("status").innerHTML = "Area too large. Zoom in to load data. (Current zoom level: "+ zoom + ". Must be at zoom 9+.)";
return false;
}
function init(){
OpenLayers.ProxyHost = "proxy.cgi?url=";
OpenLayers.Feature.Vector.style['default'].strokeWidth = 4;
OpenLayers.Feature.Vector.style['default'].cursor = 'pointer';
map = new OpenLayers.Map('map', {'maxResolution': 360/512/16, 'numZoomLevels':15, controls: [ new OpenLayers.Control.Navigation(), new OpenLayers.Control.PanZoomBar() ]});
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.addControl(new OpenLayers.Control.Permalink());
layer = new OpenLayers.Layer.WMS( "OSM",
[
"http://t1.hypercube.telascience.org/tiles?",
"http://t2.hypercube.telascience.org/tiles?",
"http://t3.hypercube.telascience.org/tiles?",
"http://t4.hypercube.telascience.org/tiles?"
],
{layers: 'osm-4326', format: 'image/png' } );
map.addLayer(layer);
if (!map.getCenter()) {
gml = new OpenLayers.Layer.GML("OSM", "osm/sutton_coldfield.osm", {format: OpenLayers.Format.OSM});
map.zoomToExtent(new OpenLayers.Bounds(-1.819072,52.549034,-1.814341,52.551582));
} else {
if (map.getZoom() >= 11) {
gml = new OpenLayers.Layer.GML("OSM", "http://www.openstreetmap.org/api/0.5/map?bbox=" + map.getExtent().toBBOX(), {format: OpenLayers.Format.OSM});
} else {
gml = new OpenLayers.Layer.GML("OSM", "xml/cambridgeport.osm", {format: OpenLayers.Format.OSM});
}
}
gml.events.register("loadstart", null, function() { $("status").innerHTML = "Loading..."; })
gml.events.register("loadend", null, function() { $("status").innerHTML = ""; })
map.addLayer(gml);
gml.preFeatureInsert = style_osm_feature;
var sf = new OpenLayers.Control.SelectFeature(gml, {'onSelect': on_feature_hover});
map.addControl(sf);
sf.activate();
}
</script>
</head>
<body onload="init()">
<h1 id="title">Advanced OSM Layer</h1>
<div id="map" class="smallmap"></div>
<div id="download">
<ul>
<li><a href="javascript:new_data();">Download current view</a></li>
<li><a href="javascript:clear_data();">Clear current data</a></li>
<li><a href="javascript:export_vectors();">Export Vector Data</a></li>
</ul>
<div id="status">Loading...</div>
</div>
<a id="vectorlink" href="" style="display:none">Display via data: URL (FF Only)</a>
<textarea id="vectors" style="display:none;width:100%" rows="10"></textarea>
</body>
</html>Je suis débutant en la matière et je n'arrive pas à modifier le code afin d'afficher d'autre données malgré les tutoriaux déjà lu.
Auriez-vous des suggestions pour obtenir les données de ce site: http://carto.ecologie.gouv.fr/HTML_PRIV … ce_idx=29W
Merci,
Squid
Hors ligne
#2 Wed 12 May 2010 18:37
- Squid
- Participant actif
- Date d'inscription: 2 Apr 2010
- Messages: 109
Re: [OpenLayers] Modification script et convertion GML en SVG
Il semble y avoir aussi la piste du XSLT pour convertir du GML en SVG. Connaissez-vous?
Hors ligne
#3 Wed 12 May 2010 23:14
Re: [OpenLayers] Modification script et convertion GML en SVG
Bonsoir,
Je me permets de déplacer le sujet ici.
Bruno
Hors ligne
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