added new graphicName symbolizer property, which allows to render well-known graphic symbols named "square", "cross", "x" and "triangle", in addition to the existing "circle". Thanks Tim for the tweaks and the example. r=tschaub,elemoine (closes #1398)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7634 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/Elements.js

@@ -371,6 +371,35 @@ OpenLayers.Renderer.Elements = OpenLayers.Class(OpenLayers.Renderer, {
         }
         return node;
     },
-
+    
+    /**
+     * Method: isComplexSymbol
+     * Determines if a symbol cannot be rendered using drawCircle
+     * 
+     * Parameters:
+     * graphicName - {String}
+     * 
+     * Returns
+     * {Boolean} true if the symbol is complex, false if not
+     */
+    isComplexSymbol: function(graphicName) {
+        return (graphicName != "circle") && !!graphicName;
+    },
+    
     CLASS_NAME: "OpenLayers.Renderer.Elements"
 });
+
+
+/**
+ * Constant: OpenLayers.Renderer.symbol
+ * Coordinate arrays for well known (named) symbols.
+ */
+OpenLayers.Renderer.symbol = {
+    "star": [350,75, 379,161, 469,161, 397,215, 423,301, 350,250, 277,301,
+            303,215, 231,161, 321,161, 350,75],
+    "cross": [4,0, 6,0, 6,4, 10,4, 10,6, 6,6, 6,10, 4,10, 4,6, 0,6, 0,4, 4,4,
+            4,0],
+    "x": [0,0, 25,0, 50,35, 75,0, 100,0, 65,50, 100,100, 75,100, 50,65, 25,100, 0,100, 35,50, 0,0],
+    "square": [0,0, 0,1, 1,1, 1,0, 0,0],
+    "triangle": [0,10, 10,10, 5,0, 0,10]
+}