Ticket #1302: gridOrigin.patch

lib/OpenLayers/Layer/Grid.js

@@ -59 +59 @@
-     */
-    numLoadingTiles: 0,
-
+     /**                                                 
+     * APIProperty: gridOrigin                              
+     * {LongLat} origin of the grid tiles for all resolution. Usefull for WMSC
+     * layers which requested tiles must be stricly aligned to the server grid
+     * If not specified : bottom left corner of the map.maxExtent
+     */                                                
+    gridOrigin: null, 
+
-    /**
-     * Constructor: OpenLayers.Layer.Grid
-     * Create a new grid layer
@@ -316 +324 @@
-        var minCols = Math.ceil(viewSize.w/this.tileSize.w) +
-                      Math.max(1, 2 * this.buffer);
-        
-
+
+
+
-        var resolution = this.map.getResolution();
-        var tilelon = resolution * this.tileSize.w;
-        var tilelat = resolution * this.tileSize.h;
-        
-extent.left
+this.gridOrigin.lon
-        var tilecol = Math.floor(offsetlon/tilelon) - this.buffer;
-        var tilecolremain = offsetlon/tilelon - tilecol;
-        var tileoffsetx = -tilecolremain * this.tileSize.w;
-extent.left
+this.gridOrigin.lon
-        
-extent.bottom
+this.gridOrigin.lat
-        var tilerow = Math.ceil(offsetlat/tilelat) + this.buffer;
-        var tilerowremain = tilerow - offsetlat/tilelat;
-        var tileoffsety = -tilerowremain * this.tileSize.h;
-extent.bottom
+this.gridOrigin.lat
-        
-        tileoffsetx = Math.round(tileoffsetx); // heaven help us
-        tileoffsety = Math.round(tileoffsety);