Refactored shape data property

Spiro/PathShape.cs

@@ -49,15 +49,10 @@ namespace SpiroNet
         public bool IsTagged { get; set; }
 
         /// <summary>
-        /// The generated Path data.
+        /// Try to generate Path shape data from Points using path bezier context implementation.
         /// </summary>
-        public string Data { get; set; }
-
-        /// <summary>
-        /// Generate Path shape data using path bezier context implementation.
-        /// </summary>
-        /// <returns>True when Data was generated successfully.</returns>
-        public bool UpdateData()
+        /// <returns>True when output data was generated successfully.</returns>
+        public bool TryGetData(out string data)
         {
             var points = this.Points.ToArray();
             var bc = new PathBezierContext();
@@ -66,9 +61,9 @@ namespace SpiroNet
             {
                 var success = Spiro.TaggedSpiroCPsToBezier0(points, bc);
                 if (success)
-                    this.Data = bc.ToString();
+                    data = bc.ToString();
                 else
-                    this.Data = string.Empty;
+                    data = null;
 
                 return success;
             }
@@ -76,9 +71,9 @@ namespace SpiroNet
             {
                 var success = Spiro.SpiroCPsToBezier0(points, points.Length, this.IsClosed, bc);
                 if (success)
-                    this.Data = bc.ToString();
+                    data = bc.ToString();
                 else
-                    this.Data = string.Empty;
+                    data = null;
 
                 return success;
             }

Wpf/SpiroCanvas.cs

@@ -32,6 +32,7 @@ namespace SpiroNet.Wpf
     public class SpiroCanvas : Canvas
     {
         public IList<PathShape> Shapes { get; set; }
+        public IDictionary<PathShape, string> Data { get; set; }
 
         private Brush _geometryBrush;
         private Brush _geometryPenBrush;
@@ -78,18 +79,19 @@ namespace SpiroNet.Wpf
             if (shape == null)
                 return;
 
-            if (!string.IsNullOrEmpty(shape.Data))
+            string data;
+            if (Data.TryGetValue(shape, out data) && !string.IsNullOrEmpty(data))
             {
-                var geometry = Geometry.Parse(shape.Data);
+                var geometry = Geometry.Parse(data);
                 dc.DrawGeometry(shape.IsClosed ? _geometryBrush : null, _geometryPen, geometry);
             }
 
-            if (shape.Points == null)
-                return;
-
-            foreach (var point in shape.Points)
+            if (shape.Points != null)
             {
-                dc.DrawEllipse(_pointBrush, null, new Point(point.X, point.Y), 4.0, 4.0);
+                foreach (var point in shape.Points)
+                {
+                    dc.DrawEllipse(_pointBrush, null, new Point(point.X, point.Y), 4.0, 4.0);
+                }
             }
         }
     }