Factor out javascript code to support OpenLayers maps into a common file

that is shared by both the (current) pages that display maps.
2007-06-23 18:29:01 +00:00 · 2007-06-23 18:29:01 +00:00 · 9619dfdb4b
commit 9619dfdb4b
parent 9ec1b1bea5
4 changed files with 172 additions and 211 deletions
--- a/public/javascripts/map.js
+++ b/public/javascripts/map.js
@ -0,0 +1,110 @@
+var map;
+var markers;
+var popup;
+
+function createMap(divName, centre, zoom) {
+   OpenLayers.Util.onImageLoadError = function() {
+      this.src = OpenLayers.Util.getImagesLocation() + "404.png";
+   }
+
+   map = new OpenLayers.Map(divName,
+                            { maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
+                              numZoomLevels: 19,
+                              maxResolution: 156543,
+                              units: 'm',
+                              projection: "EPSG:41001" });
+
+   var mapnik = new OpenLayers.Layer.TMS("Mapnik",
+                                         "http://tile.openstreetmap.org/",
+                                         { type: 'png', getURL: getTileURL });
+   map.addLayer(mapnik);
+
+   var osmarender = new OpenLayers.Layer.TMS("Osmarender",
+                                             "http://dev.openstreetmap.org/~ojw/Tiles/tile.php/",
+                                             { type: 'png', getURL: getTileURL });
+   map.addLayer(osmarender);
+
+   map.addControl(new OpenLayers.Control.LayerSwitcher());
+   map.setCenter(centre, zoom);
+
+   return map;
+}
+
+function getTileURL(bounds) {
+   var res = this.map.getResolution();
+   var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
+   var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
+   var z = this.map.getZoom();
+
+   return this.url + z + "/" + x + "/" + y + "." + this.type;
+}
+
+function addMarkerToMap(position, icon, description) {
+   if (markers == null) {
+      markers = new OpenLayers.Layer.Markers("markers");
+      map.addLayer(markers);
+   }
+
+   var marker = new OpenLayers.Marker(position, icon);
+
+   markers.addMarker(marker);
+
+   if (description) {
+      marker.events.register("click", marker, function() { openMapPopup(marker, description) });
+   }
+
+   return marker;
+}
+
+function openMapPopup(marker, description) {
+//   var box = document.createElement("div");
+//   box.innerHTML = description;
+//   box.style.display = 'none';
+//   box.style.width = "200px";
+//   document.body.appendChild(box);
+
+   closeMapPopup();
+
+   popup = new OpenLayers.Popup.AnchoredBubble("popup", marker.lonlat,
+                                               new OpenLayers.Size(200, 50),
+                                               "<p>" + description + "</p>",
+                                               marker.icon, true);
+   popup.setBackgroundColor("#E3FFC5");
+   map.addPopup(popup);
+
+   return popup;
+}
+
+function closeMapPopup() {
+   if (popup) {
+      map.removePopup(popup);
+      delete popup;
+   }
+}
+
+function removeMarkerFromMap(marker){
+   markers.removeMarker(marker);
+}
+
+function mercatorToLonLat(merc) {
+   var lon = (merc.lon / 20037508.34) * 180;
+   var lat = (merc.lat / 20037508.34) * 180;
+   var PI = 3.14159265358979323846;
+
+   lat = 180/PI * (2 * Math.atan(Math.exp(lat * PI / 180)) - PI / 2);
+
+   return new OpenLayers.LonLat(lon, lat);
+}
+
+function lonLatToMercator(ll) {
+   var lon = ll.lon * 20037508.34 / 180;
+   var lat = Math.log(Math.tan((90 + ll.lat) * PI / 360)) / (PI / 180);
+
+   lat = lat * 20037508.34 / 180;
+
+   return new OpenLayers.LonLat(lon, lat);
+}
+
+function scaleToZoom(scale) {
+   return Math.log(360.0/(scale * 512.0)) / Math.log(2.0);
+}