Fixes for the WMTS layer to properly update matrix related properties. Determining the best matrix in the set based on current map resolution. Properly parsing TopLeftCorner coordinates and providing a way to specify identifiers for backwards CRS. r=ahocevar (closes #2677)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10570 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/WMTSCapabilities/v1_0_0.js

@@ -33,6 +33,15 @@ OpenLayers.Format.WMTSCapabilities.v1_0_0 = OpenLayers.Class(
         xlink: "http://www.w3.org/1999/xlink"
     },    
     
+    /**
+     * Property: yx
+     * {Object} Members in the yx object are used to determine if a CRS URN
+     *     corresponds to a CRS with y,x axis order.  Member names are CRS URNs
+     *     and values are boolean.  Defaults come from the 
+     *     <OpenLayers.Format.WMTSCapabilities> prototype.
+     */
+    yx: null,
+
     /**
      * Property: defaultPrefix
      * {String} The default namespace alias for creating element nodes.
@@ -50,6 +59,10 @@ OpenLayers.Format.WMTSCapabilities.v1_0_0 = OpenLayers.Class(
     initialize: function(options) {
         OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
         this.options = options;
+        var yx = OpenLayers.Util.extend(
+            {}, OpenLayers.Format.WMTSCapabilities.prototype.yx
+        );
+        this.yx = OpenLayers.Util.extend(yx, this.yx);
     },
 
     /**
@@ -123,8 +136,9 @@ OpenLayers.Format.WMTSCapabilities.v1_0_0 = OpenLayers.Class(
                 // duck type wmts:Contents by looking for layers
                 if (obj.layers) {
                     // TileMatrixSet as object type in schema
-                    var tileMatrixSet = {};
-                    tileMatrixSet.matrixIds = [];
+                    var tileMatrixSet = {
+                        matrixIds: []
+                    };
                     this.readChildNodes(node, tileMatrixSet);
                     obj.tileMatrixSets[tileMatrixSet.identifier] = tileMatrixSet;
                 } else {
@@ -133,7 +147,9 @@ OpenLayers.Format.WMTSCapabilities.v1_0_0 = OpenLayers.Class(
                 }
             },
             "TileMatrix": function(node, obj) {
-                var tileMatrix = {};
+                var tileMatrix = {
+                    supportedCRS: obj.supportedCRS
+                };
                 this.readChildNodes(node, tileMatrix);
                 obj.matrixIds.push(tileMatrix);
             },
@@ -143,7 +159,25 @@ OpenLayers.Format.WMTSCapabilities.v1_0_0 = OpenLayers.Class(
             "TopLeftCorner": function(node, obj) {                
                 var topLeftCorner = this.getChildValue(node);
                 var coords = topLeftCorner.split(" ");
-                obj.topLeftCorner = new OpenLayers.LonLat(parseFloat(coords[1]), parseFloat(coords[0]));
+                // decide on axis order for the given CRS
+                var yx;
+                if (obj.supportedCRS) {
+                    // extract out version from URN
+                    var crs = obj.supportedCRS.replace(
+                        /urn:ogc:def:crs:(\w+):.+:(\w+)$/, 
+                        "urn:ogc:def:crs:$1::$2"
+                    );
+                    yx = !!this.yx[crs];
+                }
+                if (yx) {
+                    obj.topLeftCorner = new OpenLayers.LonLat(
+                        coords[1], coords[0]
+                    );
+                } else {
+                    obj.topLeftCorner = new OpenLayers.LonLat(
+                        coords[0], coords[1]
+                    );
+                }
             },
             "TileWidth": function(node, obj) {
                 obj.tileWidth = parseInt(this.getChildValue(node));