Added a RadialGradient

Xwt.Gtk/Xwt.CairoBackend/CairoGradientBackendHandler.cs

@@ -36,6 +36,11 @@ namespace Xwt.CairoBackend
 			return new Cairo.LinearGradient (x0, y0, x1, y1);
 		}
 
+		public object CreateRadial (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
+		{
+			return new Cairo.RadialGradient (cx0, cy0, radius0, cx1, cy1, radius1);
+		}
+
 		public void AddColorStop (object backend, double position, Xwt.Drawing.Color color)
 		{
 			Cairo.Gradient g = (Cairo.Gradient) backend;

Xwt.Mac/Xwt.Mac/GradientBackendHandler.cs

@@ -38,6 +38,11 @@ namespace Xwt.Mac
 		{
 			return new GradientInfo () { Linear = true, Start = new Point (x0, y0), End = new Point (x1, y1) };
 		}
+
+		public object CreateRadial (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
+		{
+			throw new NotImplementedException ();
+		}
 	
 		public void AddColorStop (object backend, double position, Xwt.Drawing.Color color)
 		{

Xwt.WPF/Xwt.WPFBackend/GradientBackendHandler.cs

@@ -44,6 +44,11 @@ namespace Xwt.WPFBackend
 				new PointF ((float) x1, (float) y1));
 		}
 
+		public object CreateRadial (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
+		{
+			throw new NotImplementedException ();
+		}
+
 		public void AddColorStop (object backend, double position, Color color)
 		{
 			((GradientBase)backend).ColorStops.Add (new Tuple<double, Color> (position, color));

Xwt/Xwt.Backends/IGradientBackendHandler.cs

@@ -32,6 +32,7 @@ namespace Xwt.Backends
 	public interface IGradientBackendHandler: IBackendHandler
 	{
 		object CreateLinear (double x0, double y0, double x1, double y1);
+		object CreateRadial (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1);
 		void AddColorStop (object backend, double position, Color color);
 	}
 }

Xwt/Xwt.Drawing/RadialGradient.cs

@@ -0,0 +1,40 @@
+//
+// RadialGradient.cs
+//
+// Author: Jeffrey Stedfast <jeff@xamarin.com>
+//
+// Copyright (c) 2012 Jeffrey Stedfast
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+using System;
+using Xwt.Backends;
+
+namespace Xwt.Drawing
+{
+	public sealed class RadialGradient: Gradient
+	{
+		public RadialGradient (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
+		{
+			Backend = ((IGradientBackendHandler)BackendHandler).CreateRadial (cx0, cy0, radius0, cx1, cy1, radius1);
+		}
+	}
+}
+

Xwt/Xwt.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -133,6 +133,7 @@
     <Compile Include="Xwt.Drawing\LinearGradient.cs" />
     <Compile Include="Xwt.Drawing\Pattern.cs" />
     <Compile Include="Xwt.Drawing\Gradient.cs" />
+    <Compile Include="Xwt.Drawing\RadialGradient.cs" />
     <Compile Include="Xwt.Drawing\TextLayout.cs" />
     <Compile Include="Xwt.Drawing\Font.cs" />
     <Compile Include="Xwt.Backends\IGradientBackendHandler.cs" />