JS: helper for Géoportail layer

1 files changed, 43 insertions, 0 deletions

diff --git a/chimere/static/chimere/js/jquery.chimere.js b/chimere/static/chimere/js/jquery.chimere.js
index 39b1abd..4e9e89b 100644
--- a/chimere/static/chimere/js/jquery.chimere.js
+++ b/chimere/static/chimere/js/jquery.chimere.js
@@ -74,6 +74,49 @@ var LayerSwitcher = function(options){
 
 }; // LayerSwitcher
 
+
+// Géoportail (IGN)
+// example: geoportail_layer('2mqbg0z6cx7ube8gsou10nrt', 'GEOGRAPHICALGRIDSYSTEMS.MAPS', 'Géoportail - Plan IGN', 18, 'image/jpeg')
+// geoportail_layer('2mqbg0z6cx7ube8gsou10nrt', 'CADASTRALPARCELS.PARCELS', 'Géoportail - Cadastre', 20, 'image/png')
+function geoportail_layer(key, layer, name, max_zoom, image_format){
+    var resolutions = [];
+    var matrixIds = [];
+    var proj3857 = ol.proj.get('EPSG:3857');
+    var maxResolution = ol.extent.getWidth(proj3857.getExtent()) / 256;
+    for (var i = 0; i < max_zoom; i++) {
+        matrixIds[i] = i.toString();
+        resolutions[i] = maxResolution / Math.pow(2, i);
+    }
+
+    var plan_tileGrid = new ol.tilegrid.WMTS({
+        origin: [-20037508, 20037508],
+        resolutions: resolutions,
+        matrixIds: matrixIds
+    });
+
+    var plan_ign_source = new ol.source.WMTS({
+            url: 'http://wxs.ign.fr/' + key + '/wmts',
+            layer: layer,
+            matrixSet: 'PM',
+            format: image_format,
+            projection: 'EPSG:3857',
+            tileGrid: plan_tileGrid,
+            style: 'normal',
+            attributions: [new ol.Attribution({
+              html: '<a href="http://www.geoportail.fr/" target="_blank">' +
+                  '<img src="http://api.ign.fr/geoportail/api/js/latest/' +
+                  'theme/geoportal/img/logo_gp.gif"></a>'
+            })]
+    });
+
+    return new ol.layer.Tile({
+       baselayer: true,
+       name: name,
+       source: plan_ign_source
+    });
+}
+
+
 function transformExtent(extent) {
   return ol.proj.transformExtent(
     extent, EPSG_DISPLAY_PROJECTION, EPSG_PROJECTION);