Give any item / object that needs to be exported as a definition / symbol its own unique id.

This will be useful in SVG and JSON exporter.

src/color/GradientColor.js

@@ -79,6 +79,8 @@ var GradientColor = this.GradientColor = Color.extend(/** @lends GradientColor#
 	 * path.fillColor = gradientColor;
 	 */
 	initialize: function(gradient, origin, destination, hilite) {
+		// Define this GradientColor's unique id.
+		this._id = ++Base._uid;
 		this.gradient = gradient || new Gradient();
 		this.gradient._addOwner(this);
 		this.setOrigin(origin);

src/core/Base.js

@@ -54,6 +54,11 @@ this.Base = Base.inject(/** @lends Base# */{
 
 		_types: {},
 
+		/**
+		 * A uniqued id number, which when consumed needs to be increased by one
+		 */
+		_uid: 0,
+
 		extend: function(src) {
 			// Override Base.extend() with a version that registers classes that
 			// define #_type inside the Base._types lookup, for deserialization.

src/item/Item.js

@@ -31,7 +31,7 @@ var Item = this.Item = Base.extend(Callback, /** @lends Item# */{
 
 	initialize: function(point) {
 		// Define this Item's unique id.
-		this._id = ++Item._id;
+		this._id = ++Base._uid;
 		// If _project is already set, the item was already moved into the DOM
 		// hierarchy. Used by Layer, where it's added to project.layers instead
 		if (!this._project)
@@ -270,7 +270,7 @@ var Item = this.Item = Base.extend(Callback, /** @lends Item# */{
 		}
 		this._name = name || undefined;
 		this._changed(/*#=*/ ChangeFlag.ATTRIBUTE);
-	},
+	}
 
 	/**
 	 * The path style of the item.
@@ -312,10 +312,6 @@ var Item = this.Item = Base.extend(Callback, /** @lends Item# */{
 	 * var path2 = new Path.Circle(new Point(150, 50), 20);
 	 * path2.style = myStyle;
 	 */
-
-	statics: {
-		_id: 0
-	}
 }, Base.each(['locked', 'visible', 'blendMode', 'opacity', 'guide'],
 	// Produce getter/setters for properties. We need setters because we want to
 	// call _changed() if a property was modified.

src/project/Symbol.js

@@ -57,6 +57,8 @@ var Symbol = this.Symbol = Base.extend(/** @lends Symbol# */{
 	 * }
 	 */
 	initialize: function(item) {
+		// Define this Symbols's unique id.
+		this._id = ++Base._uid;
 		this.project = paper.project;
 		this.project.symbols.push(this);
 		this.setDefinition(item);