some OnAttributeChanged events would not be fired, added changed check for some attributes

Source/Basic Shapes/SvgCircle.cs

@@ -35,9 +35,13 @@ namespace Svg
         {
             get { return this._centerX; }
             set
+            {
+            	if(_centerX != value)
             	{
             		this._centerX = value;
             		this.IsPathDirty = true;
+            		OnAttributeChanged(new AttributeEventArgs{ Attribute = "cx", Value = value });
+            	}
             }
         }
 
@@ -46,9 +50,13 @@ namespace Svg
         {
         	get { return this._centerY; }
         	set
+        	{
+        		if(_centerY != value)
         		{
         			this._centerY = value;
         			this.IsPathDirty = true;
+        			OnAttributeChanged(new AttributeEventArgs{ Attribute = "cy", Value = value });
+        		}
         	}
         }
 
@@ -56,7 +64,15 @@ namespace Svg
         public virtual SvgUnit Radius
         {
         	get { return this._radius; }
-            set { this._radius = value; this.IsPathDirty = true; }
+        	set
+        	{
+        		if(_radius != value)
+        		{
+        			this._radius = value;
+        			this.IsPathDirty = true;
+        			OnAttributeChanged(new AttributeEventArgs{ Attribute = "r", Value = value });
+        		}
+        	}
         }
 
         /// <summary>

Source/Basic Shapes/SvgRectangle.cs

@@ -48,12 +48,15 @@ namespace Svg
         {
         	get { return _x; }
         	set
+        	{
+        		if(_x != value)
         		{
         			_x = value;
         			OnAttributeChanged(new AttributeEventArgs{ Attribute = "x", Value = value });
         			IsPathDirty = true;
         		}
         	}
+        }
 
         /// <summary>
         /// Gets or sets the position where the top point of the rectangle should start.
@@ -63,12 +66,15 @@ namespace Svg
         {
         	get { return _y; }
         	set
+        	{
+        		if(_y != value)
         		{
         			_y = value;
         			OnAttributeChanged(new AttributeEventArgs{ Attribute = "y", Value = value });
         			IsPathDirty = true;
         		}
         	}
+        }
 
         /// <summary>
         /// Gets or sets the width of the rectangle.
@@ -78,12 +84,15 @@ namespace Svg
         {
         	get { return _width; }
         	set
+        	{
+        		if(_width != value)
         		{
         			_width = value;
         			OnAttributeChanged(new AttributeEventArgs{ Attribute = "width", Value = value });
         			IsPathDirty = true;
         		}
         	}
+        }
 
         /// <summary>
         /// Gets or sets the height of the rectangle.
@@ -93,12 +102,15 @@ namespace Svg
         {
         	get { return _height; }
         	set
+        	{
+        		if(_height != value)
         		{
         			_height = value;
         			OnAttributeChanged(new AttributeEventArgs{ Attribute = "height", Value = value });
         			IsPathDirty = true;
         		}
         	}
+        }
 
         /// <summary>
         /// Gets or sets the X-radius of the rounded edges of this rectangle.

Source/Paths/SvgPath.cs

@@ -18,7 +18,6 @@ namespace Svg
     public class SvgPath : SvgVisualElement
     {
         private GraphicsPath _path;
-        private int _pathLength;
 
         /// <summary>
         /// Gets or sets a <see cref="SvgPathSegmentList"/> of path data.
@@ -41,8 +40,8 @@ namespace Svg
         [SvgAttribute("pathLength")]
         public int PathLength
         {
-            get { return this._pathLength; }
-            set { this._pathLength = value; }
+        	get { return this.Attributes.GetAttribute<int>("pathLength"); }
+            set { this.Attributes["pathLength"] = value; }
         }
 
 		

Source/Text/SvgText.cs

@@ -87,12 +87,15 @@ namespace Svg
         {
         	get { return this._x; }
         	set
+        	{
+        		if(_x != value)
         		{
         			this._x = value;
         			this.IsPathDirty = true;
         			OnAttributeChanged(new AttributeEventArgs{ Attribute = "x", Value = value });
         		}
         	}
+        }
 
         /// <summary>
         /// Gets or sets the Y.
@@ -103,12 +106,15 @@ namespace Svg
         {
         	get { return this._y; }
         	set
+        	{
+        		if(_y != value)
         		{
         			this._y = value;
         			this.IsPathDirty = true;
         			OnAttributeChanged(new AttributeEventArgs{ Attribute = "y", Value = value });
         		}
         	}
+        }
 
         /// <summary>
         /// Specifies spacing behavior between text characters.