Adding point, line, polygon, text, and raster symbolizer constructors. This paves the way for rendering multiple symbolizers per rule. The SLD parser now successfully round-trips documents with multiple symbolizers and multiple FeatureTypeStyle elements (through the symbolizer zIndex property). The Style2 (yes, ack) constructor is used to represent a collection of rules with multiple symbolizers. Style2 objects are currently only used by the SLD parser if the multipleSymbolizer property is set to true. Future enhancements to the renderers can be made to account for multiple symbolizers. r=ahocevar (closes #2760).

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10560 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Symbolizer.js

@@ -0,0 +1,46 @@
+/**
+ * Class: OpenLayers.Symbolizer
+ * Base class representing a symbolizer used for feature rendering.
+ */
+OpenLayers.Symbolizer = OpenLayers.Class({
+    
+
+    /**
+     * APIProperty: zIndex
+     * {Number} The zIndex determines the rendering order for a symbolizer.
+     *     Symbolizers with larger zIndex values are rendered over symbolizers
+     *     with smaller zIndex values.  Default is 0.
+     */
+    zIndex: 0,
+    
+    /**
+     * Constructor: OpenLayers.Symbolizer
+     * Instances of this class are not useful.  See one of the subclasses.
+     *
+     * Parameters:
+     * config - {Object} An object containing properties to be set on the 
+     *     symbolizer.  Any documented symbolizer property can be set at 
+     *     construction.
+     *
+     * Returns:
+     * A new symbolizer.
+     */
+    initialize: function(config) {
+        OpenLayers.Util.extend(this, config);
+    },
+    
+    /** 
+     * APIMethod: clone
+     * Create a copy of this symbolizer.
+     *
+     * Returns a symbolizer of the same type with the same properties.
+     */
+    clone: function() {
+        var Type = eval(this.CLASS_NAME);
+        return new Type(OpenLayers.Util.extend({}, this));
+    },
+    
+    CLASS_NAME: "OpenLayers.Symbolizer"
+    
+});
+