Documenting the featureDx, xOffset and rightOfDateLine member variables.

lib/OpenLayers/Renderer.js

@@ -73,6 +73,17 @@ OpenLayers.Renderer = OpenLayers.Class({
      */
     map: null,
     
+    /**
+     * Property: featureDx
+     * {Number} Feature offset in x direction. Will be calculated for and
+     * applied to the current feature while rendering. Looking at the center of
+     * the feature bounds and the renderer extent, we calculate how many world
+     * widths the two are away from each other. This value is used to shift the
+     * feature as close as possible to the center of the current renderer
+     * extent. This ensures that the feature is visible in the current
+     * viewport.
+     */
+    
     /**
      * Constructor: OpenLayers.Renderer 
      *