Add an example for using an Esri 512x512 tile server in EPSG:4326

2014-09-26 15:37:47 +02:00
parent d03755859f
commit 2321ed64bc
2 changed files with 104 additions and 0 deletions
@@ -0,0 +1,53 @@
+goog.require('ol.Attribution');
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.extent');
+goog.require('ol.layer.Tile');
+goog.require('ol.proj');
+goog.require('ol.source.TileImage');
+goog.require('ol.tilegrid.TileGrid');
+
+var attribution = new ol.Attribution({
+  html: 'Copyright:&copy; 2013 ESRI, i-cubed, GeoEye'
+});
+
+var projection = ol.proj.get('EPSG:4326');
+var projectionExtent = projection.getExtent();
+
+var size = ol.extent.getWidth(projectionExtent) / 256;
+var resolutions = new Array(16);
+for (var z = 2; z < 18; ++z) {
+  resolutions[z - 2] = size / Math.pow(2, z);
+}
+
+var url = 'http://services.arcgisonline.com/arcgis/rest/services/' +
+    'ESRI_Imagery_World_2D/MapServer/tile/';
+
+var map = new ol.Map({
+  target: 'map',
+  layers: [
+    new ol.layer.Tile({
+      extent: projectionExtent,
+      /* ol.source.XYZ and ol.tilegrid.XYZ have nu resolutions config */
+      source: new ol.source.TileImage({
+        attributions: [attribution],
+        tileUrlFunction: function(tileCoord, pixelRatio, projection) {
+          return url + tileCoord[0] + '/' + (-tileCoord[2] - 1) + '/' +
+              tileCoord[1];
+        },
+        projection: projection,
+        tileGrid: new ol.tilegrid.TileGrid({
+          origin: ol.extent.getTopLeft(projectionExtent),
+          resolutions: resolutions,
+          tileSize: 512
+        })
+      })
+    })
+  ],
+  view: new ol.View({
+    center: [0, 0],
+    projection: projection,
+    zoom: 2,
+    minZoom: 2
+  })
+});