* added stroke, fill and graphic symbolizer properties (all boolean) to

control whether or not to render a stroke, fill and graphic.
 * added a defaultsPerSymbolizer property to OpenLayers.Style to allow 
for extending incomplete symbolizers with defaults for stroke, fill or 
graphic. This also makes Format.SLD read/write round trips possible 
without modifying empty or incomplete <Stroke/>, <Fill/> and <Graphic/> 
constructs. r=tschaub (closes #1876)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@9278 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/Elements.js

@@ -661,12 +661,20 @@ OpenLayers.Renderer.Elements = OpenLayers.Class(OpenLayers.Renderer, {
         OpenLayers.Util.applyDefaults(style, this.minimumSymbolizer);
 
         var options = {
-            'isFilled': true,
-            'isStroked': !!style.strokeWidth
+            'isFilled': style.fill === undefined ?
+                true :
+                style.fill,
+            'isStroked': style.stroke === undefined ?
+                !!style.strokeWidth :
+                style.stroke
         };
         var drawn;
         switch (geometry.CLASS_NAME) {
             case "OpenLayers.Geometry.Point":
+                if(style.graphic === false) {
+                    options.isFilled = false;
+                    options.isStroked = false;
+                }
                 drawn = this.drawPoint(node, geometry);
                 break;
             case "OpenLayers.Geometry.LineString":