Implemented CornerRadius for Border

Perspex.Controls/Border.cs

@@ -22,6 +22,9 @@ namespace Perspex.Controls
         public static readonly PerspexProperty<double> BorderThicknessProperty =
             PerspexProperty.Register<Border, double>("BorderThickness");
 
+        public static readonly PerspexProperty<float> CornerRadiusProperty =
+    PerspexProperty.Register<Border, float>("CornerRadius");
+
         static Border()
         {
             Control.AffectsRender(Border.BackgroundProperty);
@@ -46,21 +49,28 @@ namespace Perspex.Controls
             set { this.SetValue(BorderThicknessProperty, value); }
         }
 
+        public float CornerRadius
+        {
+            get { return this.GetValue(CornerRadiusProperty); }
+            set { this.SetValue(CornerRadiusProperty, value); }
+        }
+
         public override void Render(IDrawingContext context)
         {
             Brush background = this.Background;
             Brush borderBrush = this.BorderBrush;
             double borderThickness = this.BorderThickness;
+            float cornerRadius = this.CornerRadius;
             Rect rect = new Rect(this.Bounds.Size).Deflate(this.BorderThickness);
 
             if (background != null)
             {
-                context.FillRectange(background, rect);
+                context.FillRectange(background, rect, cornerRadius);
             }
 
             if (borderBrush != null && borderThickness > 0)
             {
-                context.DrawRectange(new Pen(borderBrush, borderThickness), rect);
+                context.DrawRectange(new Pen(borderBrush, borderThickness), rect, cornerRadius);
             }
         }
 

Perspex.SceneGraph/Media/IDrawingContext.cs

@@ -39,7 +39,7 @@ namespace Perspex.Media
         /// </summary>
         /// <param name="pen">The pen.</param>
         /// <param name="rect">The rectangle bounds.</param>
-        void DrawRectange(Pen pen, Rect rect);
+        void DrawRectange(Pen pen, Rect rect, float cornerRadius = 0.0f);
 
         /// <summary>
         /// Draws text.
@@ -54,7 +54,7 @@ namespace Perspex.Media
         /// </summary>
         /// <param name="brush">The brush.</param>
         /// <param name="rect">The rectangle bounds.</param>
-        void FillRectange(Brush brush, Rect rect);
+        void FillRectange(Brush brush, Rect rect, float cornerRadius = 0.0f);
 
         /// <summary>
         /// Pushes a clip rectange.

Windows/Perspex.Direct2D1/Media/DrawingContext.cs

@@ -125,13 +125,13 @@ namespace Perspex.Direct2D1.Media
         /// </summary>
         /// <param name="pen">The pen.</param>
         /// <param name="rect">The rectangle bounds.</param>
-        public void DrawRectange(Pen pen, Rect rect)
+        public void DrawRectange(Pen pen, Rect rect, float cornerRadius)
         {
             using (var brush = pen.Brush.ToDirect2D(this.renderTarget))
             using (var d2dStroke = pen.ToDirect2DStrokeStyle(this.renderTarget))
             {
-                this.renderTarget.DrawRectangle(
-                    rect.ToDirect2D(),
+                this.renderTarget.DrawRoundedRectangle(
+                    new RoundedRectangle { Rect = rect.ToDirect2D(), RadiusX = cornerRadius, RadiusY = cornerRadius },
                     brush,
                     (float)pen.Thickness,
                     d2dStroke);
@@ -162,16 +162,21 @@ namespace Perspex.Direct2D1.Media
         /// </summary>
         /// <param name="brush">The brush.</param>
         /// <param name="rect">The rectangle bounds.</param>
-        public void FillRectange(Perspex.Media.Brush brush, Rect rect)
+        public void FillRectange(Perspex.Media.Brush brush, Rect rect, float cornerRadius)
         {
             using (var b = brush.ToDirect2D(this.renderTarget))
             {
-                this.renderTarget.FillRectangle(
-                    new RectangleF(
-                        (float)rect.X,
-                        (float)rect.Y,
-                        (float)rect.Width,
-                        (float)rect.Height),
+                this.renderTarget.FillRoundedRectangle(
+                    new RoundedRectangle
+                    {
+                        Rect = new RectangleF(
+                                (float)rect.X,
+                                (float)rect.Y,
+                                (float)rect.Width,
+                                (float)rect.Height),
+                        RadiusX = cornerRadius,
+                        RadiusY = cornerRadius
+                    },
                     b);
             }
         }