Improved dateline handling for Grid layers. r=bartvde (closes #3521)

2011-09-28 07:43:58 -06:00
parent 8edb26d579 dfdcdb8d33
commit 949a5db60e
4 changed files with 116 additions and 7 deletions
@@ -403,6 +403,18 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
     * tileoffsetlat, tileoffsetx, tileoffsety
     */
    calculateGridLayout: function(bounds, origin, resolution) {
+        bounds = bounds.clone();
+        if (this.map.baseLayer.wrapDateLine) {
+            var maxExtent = this.map.getMaxExtent(),
+                width = maxExtent.getWidth();
+            // move the bounds one world width to the right until the origin is
+            // within the world extent
+            while (bounds.left < maxExtent.left) {
+                bounds.left += width;
+                bounds.right += width;
+            } 
+        }
+        
        var tilelon = resolution * this.tileSize.w;
        var tilelat = resolution * this.tileSize.h;