Add EPSG:4326 example

2013-02-21 20:22:46 +01:00
parent 17bd715495
commit f6575f3195
2 changed files with 103 additions and 0 deletions
--- a/examples/epsg-4326.html
+++ b/examples/epsg-4326.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="X-UA-Compatible" content="chrome=1">
+    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
+    <link rel="stylesheet" href="style.css" type="text/css">
+    <style type="text/css">
+      html, body, #map {
+        margin: 0;
+        padding: 0;
+        width: 100%;
+        height: 100%;
+      }
+      #text {
+          position: absolute;
+          top: 8px;
+          right: 8px;
+          z-index: 20000;
+          background-color: white;
+          padding: 0 0.5em 0.5em 0.5em;
+          border-radius: 4px;
+      }
+      @media only screen and (max-width: 600px) {
+        #text {
+          display: none;
+        }
+      }
+    </style>
+    <title>EPSG:4326 example</title>
+  </head>
+  <body>
+    <div id="map">
+      <div id="text">
+        <h1 id="title">EPSG:4326 example</h1>
+        <div id="shortdesc">Example of a epsg-4326 map.</div>
+        <div id="docs">
+          <p>See the
+          <a href="epsg-4326.js" target="_blank">epsg-4326.js source</a>
+          to see how this is done.</p>
+        </div>
+      </div>
+    </div>
+    <div id="tags">epsg4326</div>
+    <script src="loader.js?id=epsg-4326" type="text/javascript"></script>
+  </body>
+</html>
--- a/examples/epsg-4326.js
+++ b/examples/epsg-4326.js
@@ -0,0 +1,56 @@
+goog.require('goog.debug.Console');
+goog.require('goog.debug.Logger');
+goog.require('goog.debug.Logger.Level');
+goog.require('ol.Collection');
+goog.require('ol.Coordinate');
+goog.require('ol.Map');
+goog.require('ol.Projection');
+goog.require('ol.RendererHint');
+goog.require('ol.View2D');
+goog.require('ol.layer.TileLayer');
+goog.require('ol.source.TiledWMS');
+
+
+if (goog.DEBUG) {
+  goog.debug.Console.autoInstall();
+  goog.debug.Logger.getLogger('ol').setLevel(goog.debug.Logger.Level.INFO);
+}
+
+var epsg4326 = ol.Projection.getFromCode('EPSG:4326');
+
+// We give the single image source a set of resolutions. This prevents the
+// source from requesting images of arbitrary resolutions.
+var projectionExtent = epsg4326.getExtent();
+var maxResolution = Math.max(
+    projectionExtent.maxX - projectionExtent.minX,
+    projectionExtent.maxY - projectionExtent.minY) / 256;
+var resolutions = new Array(10);
+for (var i = 0; i < 10; ++i) {
+  resolutions[i] = maxResolution / Math.pow(2.0, i);
+}
+
+var layers = new ol.Collection([
+  new ol.layer.TileLayer({
+    source: new ol.source.TiledWMS({
+      url: 'http://vmap0.tiles.osgeo.org/wms/vmap0',
+      crossOrigin: null,
+      params: {
+        'LAYERS': 'basic',
+        'FORMAT': 'image/jpeg'
+      },
+      projection: epsg4326
+    })
+  })
+]);
+
+var map = new ol.Map({
+  layers: layers,
+  // The OSgeo server does not set cross origin headers, so we cannot use WebGL
+  renderers: [ol.RendererHint.CANVAS, ol.RendererHint.DOM],
+  target: 'map',
+  view: new ol.View2D({
+    projection: epsg4326,
+    center: new ol.Coordinate(0, 0),
+    zoom: 2
+  })
+});