Some fixes in Drawing

Samples/Samples/DrawingText.cs

@@ -102,11 +102,11 @@ namespace Samples
 			
 			// proofing rotate, and printing size to see the values
 			ctx.Save ();
-			text = new TextLayout (ctx);
+			
 			text.Font = this.Font.WithSize (10);
 			text.Text = string.Format ("Size 1 {0}\r\nSize 2 {1}\r\nSize 3 {2} Scale {3}", 
 			                           size1, size2, size3, scale);
-			//text.Width = -1; // this clears textsize
+			text.Width = -1; // this clears textsize
 			ctx.Rotate (5);
 			// maybe someone knows a formula with angle and textsize to calculyte ty
 			var ty = 30; 

Xwt.WPF/Xwt.WPFBackend/ContextBackendHandler.cs

@@ -63,9 +63,11 @@ namespace Xwt.WPFBackend
 
 		public void Arc (object backend, double xc, double yc, double radius, double angle1, double angle2)
 		{
-			var c = (DrawingContext) backend;
-			c.Path.AddArc ((float) (xc - radius), (float) (yc - radius), (float) radius * 2, (float) radius * 2, (float) angle1,
-			               (float) (angle2 - angle1));
+			var c = (DrawingContext)backend;
+			if (angle1 > 0 && angle2 == 0)
+				angle2 = 360;
+			c.Path.AddArc ((float)(xc - radius), (float)(yc - radius), (float)radius * 2, (float)radius * 2, (float)angle1,
+			               (float)(angle2 - angle1));
 
 			var current = c.Path.GetLastPoint ();
 			c.CurrentX = current.X;
@@ -95,24 +97,13 @@ namespace Xwt.WPFBackend
 
 		public void CurveTo (object backend, double x1, double y1, double x2, double y2, double x3, double y3)
 		{
-			var c = (DrawingContext) backend;
-			bool moved = false;
-			if (c.Path.PointCount != 0) {
-				var lastPoint = c.Path.GetLastPoint ();
-				moved = lastPoint.X != c.CurrentX && lastPoint.Y != c.CurrentY;
-			}
-
-			var path = moved ? new GraphicsPath () : c.Path;
-			path.AddBezier (c.CurrentX, c.CurrentY,
-							(float) x1, (float) y1,
-							(float) x2, (float) y2,
-							(float) x3, (float) y3);
-
-			if (moved)
-				c.Path.AddPath (path, connect: false);
-
-			c.CurrentX = (float) x3;
-			c.CurrentY = (float) y3;
+			var c = (DrawingContext)backend;
+			c.Path.AddBezier (c.CurrentX, c.CurrentY,
+					(float)x1, (float)y1,
+					(float)x2, (float)y2,
+					(float)x3, (float)y3);
+			c.CurrentX = (float)x3;
+			c.CurrentY = (float)y3;
 		}
 
 		public void Fill (object backend)
@@ -165,6 +156,13 @@ namespace Xwt.WPFBackend
 
 		public void RelCurveTo (object backend, double dx1, double dy1, double dx2, double dy2, double dx3, double dy3)
 		{
+			var c = (DrawingContext)backend;
+			c.Path.AddBezier (c.CurrentX, c.CurrentY,
+					(float)(c.CurrentX + dx1), (float)(c.CurrentY + dy1),
+					(float)(c.CurrentX + dx2), (float)(c.CurrentY + dy2),
+					(float)(c.CurrentX + dx3), (float)(c.CurrentY + dy3));
+			c.CurrentX = (float)(c.CurrentX + dx3);
+			c.CurrentY = (float)(c.CurrentX + dy3);
 		}
 
 		public void RelLineTo (object backend, double dx, double dy)
@@ -269,10 +267,10 @@ namespace Xwt.WPFBackend
 		{
 			var c = (DrawingContext) backend;
 			var sfont = layout.Font.ToDrawingFont ();
-			var measure = c.Graphics.MeasureString (layout.Text, sfont);
-
+			var measure = layout.GetSize ();
+			
 			c.Graphics.DrawString (layout.Text, layout.Font.ToDrawingFont (), c.Brush,
-			                       new RectangleF ((float) x, (float) y, (float)layout.Width, measure.Height));
+			                       new RectangleF ((float)x, (float)y, (float)measure.Width, (float)measure.Height), TextLayoutContext.StringFormat);
 		}
 
 		public void DrawImage (object backend, object img, double x, double y, double alpha)

Xwt/Xwt.Drawing/Context.cs

@@ -86,7 +86,7 @@ namespace Xwt.Drawing
 		/// begins at angle1 and proceeds in the direction 
 		/// of increasing angles to end at angle2. 
 		/// If angle2 is less than angle1,
-		/// it will be progressively increased by 2*Math.PI until it is greater than angle1.
+		/// it will be progressively increased by 1 degree until it is greater than angle1.
 		/// If there is a current point, an initial line segment will be added to the path 
 		/// to connect the current point to the beginning of the arc. 
 		/// If this initial line is undesired, 

Xwt/Xwt.Drawing/TextLayout.cs

@@ -71,6 +71,12 @@ namespace Xwt.Drawing
 				handler.SetText (Backend, text); }
 		}
 		
+		/// <summary>
+		/// Gets or sets the desired width.
+		/// </summary>
+		/// <value>
+		/// The width. A value of -1 uses GetSize().Width on drawings
+		/// </value>
 		public double Width {
 			get { return width; }
 			set { width = value; handler.SetWidth (Backend, value); }