Merge pull request #3722 from ahocevar/tilejson-tilegrid

Use the correct TileCoord transform function

src/ol/source/tilejsonsource.js

@@ -76,7 +76,7 @@ ol.source.TileJSON.prototype.handleTileJSONResponse = function(tileJSON) {
   this.tileGrid = tileGrid;
 
   this.tileUrlFunction = ol.TileUrlFunction.withTileCoordTransform(
-      tileGrid.createTileCoordTransform({extent: extent}),
+      ol.tilegrid.createOriginTopLeftTileCoordTransform(tileGrid),
       ol.TileUrlFunction.createFromTemplates(tileJSON.tiles));
 
   if (goog.isDef(tileJSON.attribution) &&

src/ol/source/tileutfgridsource.js

@@ -137,9 +137,7 @@ ol.source.TileUTFGrid.prototype.handleTileJSONResponse = function(tileJSON) {
   }
 
   this.tileUrlFunction_ = ol.TileUrlFunction.withTileCoordTransform(
-      tileGrid.createTileCoordTransform({
-        extent: extent
-      }),
+      ol.tilegrid.createOriginTopLeftTileCoordTransform(tileGrid),
       ol.TileUrlFunction.createFromTemplates(grids));
 
   if (goog.isDef(tileJSON.attribution)) {

src/ol/tilegrid/tilegrid.js

@@ -2,7 +2,6 @@ goog.provide('ol.tilegrid.TileGrid');
 
 goog.require('goog.array');
 goog.require('goog.asserts');
-goog.require('goog.functions');
 goog.require('goog.math');
 goog.require('goog.object');
 goog.require('ol');
@@ -165,15 +164,13 @@ ol.tilegrid.TileGrid.tmpTileCoord_ = [0, 0, 0];
 
 
 /**
- * Returns the identity function. May be overridden in subclasses.
+ * Source specific TileCoord transform function. May be implemented by
+ * subclasses.
  * @param {{extent: (ol.Extent|undefined)}=} opt_options Options.
  * @return {function(ol.TileCoord, ol.proj.Projection, ol.TileCoord=):
  *     ol.TileCoord} Tile coordinate transform.
  */
-ol.tilegrid.TileGrid.prototype.createTileCoordTransform =
-    function(opt_options) {
-  return goog.functions.identity;
-};
+ol.tilegrid.TileGrid.prototype.createTileCoordTransform = goog.abstractMethod;
 
 
 /**

test/spec/ol/source/tilejsonsource.test.js

@@ -0,0 +1,64 @@
+goog.provide('ol.test.source.TileJSON');
+
+
+describe('ol.source.TileJSON', function() {
+
+  describe('tileUrlFunction', function() {
+
+    var source, tileGrid;
+
+    beforeEach(function(done) {
+      source = new ol.source.TileJSON({
+        url: 'http://api.tiles.mapbox.com/v3/mapbox.geography-class.jsonp'
+      });
+      var key = source.on('change', function() {
+        if (source.getState() === 'ready') {
+          source.unByKey(key);
+          tileGrid = source.getTileGrid();
+          done();
+        }
+      });
+    });
+
+    it('uses the correct tile coordinates', function() {
+
+      var coordinate = [829330.2064098881, 5933916.615134273];
+      var regex = /\/([0-9]*\/[0-9]*\/[0-9]*)\.png$/;
+      var tileUrl;
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 0));
+      expect(tileUrl.match(regex)[1]).to.eql('0/0/0');
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 1));
+      expect(tileUrl.match(regex)[1]).to.eql('1/1/0');
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 2));
+      expect(tileUrl.match(regex)[1]).to.eql('2/2/1');
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 3));
+      expect(tileUrl.match(regex)[1]).to.eql('3/4/2');
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 4));
+      expect(tileUrl.match(regex)[1]).to.eql('4/8/5');
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 5));
+      expect(tileUrl.match(regex)[1]).to.eql('5/16/11');
+
+      tileUrl = source.tileUrlFunction(
+          tileGrid.getTileCoordForCoordAndZ(coordinate, 6));
+      expect(tileUrl.match(regex)[1]).to.eql('6/33/22');
+
+    });
+
+  });
+
+});
+
+goog.require('ol.TileCoord');
+goog.require('ol.source.TileJSON');