Add working code for Markers -- marker layer and marker object. Also add markers.html to demo use of markers functionality.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@107 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Marker.js

@@ -3,25 +3,35 @@ OpenLayers.Layer.Marker.prototype =
   Object.extend( new OpenLayers.Layer(), {
     
     // markers: store internal marker list
-    markers:null,
+    markers: [],
     
     initialize: function(name) {
         OpenLayers.Layer.prototype.initialize.apply(this, arguments);
     },
     
     // Implement this. It may not need to do anything usually.
-    moveTo:function(bounds,zoomChanged) {
-    
+    moveTo: function(bounds,zoomChanged) {
+        if (zoomChanged) {
+            this.div.innerHTML="";
+            for(i=0; i < this.markers.length; i++) {
+                this.drawMarker(this.markers[i]);
+            }
+        }
     },
-    addMarker:function(marker) {
+    addMarker: function(marker) {
         this.markers.append(marker);
+        if (this.map && this.map.getExtent()) {
+            this.drawMarker(marker);
+        }
+    },
+    drawMarker: function(marker) {
         var resolution = this.map.getResolution();
         var extent = this.map.getExtent();
         var pixel = new OpenLayers.Pixel(
-                       resolution * (this.lonlat.lon - extent.minlon),
-                       resolution * (extent.maxlat - this.lonlat.lat)
+                       1/resolution * (marker.lonlat.lon - extent.minlon),
+                       1/resolution * (extent.maxlat - marker.lonlat.lat)
                        );
         var m = marker.generateMarker(pixel);
         this.div.appendChild(m);
-    },
+    }
 });