From e140a5d84375b4b917eb0dfea6279527241ee9e8 Mon Sep 17 00:00:00 2001
From: pgiraud <pierre.giraud@camptocamp.com>
Date: Mon, 4 Apr 2011 07:20:48 +0000
Subject: [PATCH] Adding wrapDateLine support for XYZ layers. The OSM layer now
 wraps the date line by default. p=tomh, r=me (Closes #2246)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11864 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 examples/mobile-drawing.js  |  5 ++++-
 lib/OpenLayers/Layer/XYZ.js |  7 +++++++
 tests/Layer/XYZ.html        | 13 ++++++++++++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/examples/mobile-drawing.js b/examples/mobile-drawing.js
index c4083e8a7b..98998d0072 100644
--- a/examples/mobile-drawing.js
+++ b/examples/mobile-drawing.js
@@ -35,6 +35,9 @@ function init() {
         })
     ]);
 
+    var osm = new OpenLayers.Layer.OSM();
+    osm.wrapDateLine = false;
+
     map = new OpenLayers.Map({
         div: 'map',
         projection: 'EPSG:900913',
@@ -53,7 +56,7 @@ function init() {
             new OpenLayers.Control.ZoomPanel(),
             toolbar
         ],
-        layers: [new OpenLayers.Layer.OSM(), vector],
+        layers: [osm, vector],
         center: new OpenLayers.LonLat(0, 0),
         zoom: 1,
         theme: null
diff --git a/lib/OpenLayers/Layer/XYZ.js b/lib/OpenLayers/Layer/XYZ.js
index d8cbf53716..4689f9c9f0 100644
--- a/lib/OpenLayers/Layer/XYZ.js
+++ b/lib/OpenLayers/Layer/XYZ.js
@@ -148,6 +148,12 @@ OpenLayers.Layer.XYZ = OpenLayers.Class(OpenLayers.Layer.Grid, {
             OpenLayers.Util.indexOf(this.serverResolutions, res) :
             this.map.getZoom() + this.zoomOffset;
 
+        var limit = Math.pow(2, z);
+        if (this.wrapDateLine)
+        {
+           x = ((x % limit) + limit) % limit;
+        }
+
         return {'x': x, 'y': y, 'z': z};
     },
     
@@ -199,5 +205,6 @@ OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.XYZ, {
          obj = OpenLayers.Layer.XYZ.prototype.clone.apply(this, [obj]);
          return obj;
      },
+     wrapDateLine: true,
      CLASS_NAME: "OpenLayers.Layer.OSM"
 });
diff --git a/tests/Layer/XYZ.html b/tests/Layer/XYZ.html
index dd15b56d7d..a13ee845c3 100644
--- a/tests/Layer/XYZ.html
+++ b/tests/Layer/XYZ.html
@@ -108,7 +108,7 @@
      */
     function test_Layer_XYZ_getURL(t) {
 
-        t.plan(2);
+        t.plan(6);
         
         var map = new OpenLayers.Map('map');
         layer = new OpenLayers.Layer.XYZ(name, url);
@@ -120,6 +120,17 @@
         layer.url = ["http://tilecache1/", "http://tilecache2/", "http://tilecache3/"];
         tileurl = layer.getURL(new OpenLayers.Bounds(3.515625,45,4.21875,45.703125));
         t.eq(tileurl, "http://tilecache1/", "Tile URL is deterministic");
+
+        layer.url = url;
+        tileurl = layer.getURL(new OpenLayers.Bounds(180.515625,45,181.21875,45.703125));
+        t.eq(tileurl, "http://labs.metacarta.com/wms-c/Basic.py/1.0.0/basic/9/513/63.png", "Tile URL is correct");
+        tileurl = layer.getURL(new OpenLayers.Bounds(-181.515625,45,-180.21875,45.703125));
+        t.eq(tileurl, "http://labs.metacarta.com/wms-c/Basic.py/1.0.0/basic/9/-2/63.png", "Tile URL is correct");
+        layer.wrapDateLine = true;
+        tileurl = layer.getURL(new OpenLayers.Bounds(180.515625,45,181.21875,45.703125));
+        t.eq(tileurl, "http://labs.metacarta.com/wms-c/Basic.py/1.0.0/basic/9/1/63.png", "Tile URL is correct");
+        tileurl = layer.getURL(new OpenLayers.Bounds(-181.515625,45,-180.21875,45.703125));
+        t.eq(tileurl, "http://labs.metacarta.com/wms-c/Basic.py/1.0.0/basic/9/510/63.png", "Tile URL is correct");
         map.destroy();
     }
     function test_Layer_XYZ_Rounding(t) {