Ticket #482: tile_bounds.patch

Grid.js

@@ -434 +434 @@
-        }
-    },
-    
+    /**
+     *
+     * @param {OpenLayers.Pixel} viewPortPx The location in the viewport
+     *
+     * @returns The tile bounds for a layer given a pixel location
+     * @type OpenLayers.Bounds
+     */
+    getTileBounds: function(viewPortPx) {
+        var maxExtent = this.map.getMaxExtent();
+        var resolution = this.getResolution();
+        var tileMapWidth = resolution * this.tileSize.w;
+        var tileMapHeight = resolution * this.tileSize.h;
+        var mapPoint = this.getLonLatFromViewPortPx(viewPortPx);
+        var tileLeft = maxExtent.left + (tileMapWidth *
+                                         Math.floor((mapPoint.lon -
+                                                     maxExtent.left) /
+                                                    tileMapWidth));
+        var tileBottom = maxExtent.bottom + (tileMapHeight *
+                                             Math.floor((mapPoint.lat -
+                                                         maxExtent.bottom) /
+                                                        tileMapHeight));
+        return new OpenLayers.Bounds(tileLeft, tileBottom,
+                                     tileLeft + tileMapWidth,
+                                     tileBottom + tileMapHeight);
+    },
+    
-    /** @final @type String */
-    CLASS_NAME: "OpenLayers.Layer.Grid"
-});