Added Line and LineGeometry for line drawing.

samples/TestApplicationShared/MainWindow.cs

@@ -688,6 +688,15 @@ namespace TestApplication
                                         [Canvas.LeftProperty] = 130,
                                         [Canvas.TopProperty] = 79,
                                     },
+                                    new Line
+                                    {
+                                        Width = 90,
+                                        Height = 70,
+                                        Stroke = Brushes.Red,
+                                        StrokeThickness = 2,
+                                        [Canvas.LeftProperty] = 30,
+                                        [Canvas.TopProperty] = 120
+                                    }
                                 }
                             },
                         }

src/Perspex.Controls/Perspex.Controls.csproj

@@ -47,6 +47,7 @@
     <Compile Include="Platform\PlatformManager.cs" />
     <Compile Include="SelectionMode.cs" />
     <Compile Include="Separator.cs" />
+    <Compile Include="Shapes\Line.cs" />
     <Compile Include="SystemDialog.cs" />
     <Compile Include="Generators\ITreeItemContainerGenerator.cs" />
     <Compile Include="Generators\ItemContainers.cs" />

src/Perspex.Controls/Shapes/Line.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Perspex.Media;
+
+namespace Perspex.Controls.Shapes
+{
+    public class Line : Shape
+    {
+        private Geometry _geometry;
+
+        private Size _geometrySize;
+
+        public override Geometry DefiningGeometry
+        {
+            get
+            {
+                if (_geometry == null || _geometrySize != Bounds.Size)
+                {
+                    var rect = new Rect(Bounds.Size).Deflate(StrokeThickness);
+                    _geometry = new LineGeometry(rect.TopLeft, rect.BottomRight);
+                    _geometrySize = Bounds.Size;
+                }
+
+                return _geometry;
+            }
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            return new Size(StrokeThickness, StrokeThickness);
+        }
+    }
+}

src/Perspex.SceneGraph/Media/LineGeometry.cs

@@ -0,0 +1,42 @@
+// Copyright (c) The Perspex Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using Perspex.Platform;
+
+namespace Perspex.Media
+{
+    /// <summary>
+    /// Represents the geometry of a line.
+    /// </summary>
+    public class LineGeometry : Geometry
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LineGeometry"/> class.
+        /// </summary>
+        /// <param name="startPoint">The start point.</param>
+        /// <param name="endPoint">The end point.</param>
+        public LineGeometry(Point startPoint, Point endPoint)
+        {
+            IPlatformRenderInterface factory = PerspexLocator.Current.GetService<IPlatformRenderInterface>();
+            IStreamGeometryImpl impl = factory.CreateStreamGeometry();
+
+            using (IStreamGeometryContextImpl context = impl.Open())
+            {
+                context.BeginFigure(startPoint, true);
+                context.LineTo(endPoint);
+                context.EndFigure(true);
+            }
+
+            PlatformImpl = impl;
+        }
+
+        /// <inheritdoc/>
+        public override Rect Bounds => PlatformImpl.Bounds;
+
+        /// <inheritdoc/>
+        public override Geometry Clone()
+        {
+            return new LineGeometry(Bounds.TopLeft, Bounds.BottomRight);
+        }
+    }
+}

src/Perspex.SceneGraph/Perspex.SceneGraph.csproj

@@ -70,6 +70,7 @@
     <Compile Include="Media\GradientBrush.cs" />
     <Compile Include="Media\GradientSpreadMethod.cs" />
     <Compile Include="Media\GradientStop.cs" />
+    <Compile Include="Media\LineGeometry.cs" />
     <Compile Include="Media\RadialGradientBrush.cs" />
     <Compile Include="Media\LinearGradientBrush.cs" />
     <Compile Include="Media\MediaExtensions.cs" />

tests/Perspex.RenderTests/Perspex.Direct2D1.RenderTests.csproj

@@ -76,6 +76,7 @@
     <Compile Include="Controls\ImageTests.cs" />
     <Compile Include="Controls\BorderTests.cs" />
     <Compile Include="Media\LinearGradientBrushTests.cs" />
+    <Compile Include="Shapes\LineTests.cs" />
     <Compile Include="Shapes\PathTests.cs" />
     <Compile Include="Shapes\EllipseTests.cs" />
     <Compile Include="Shapes\RectangleTests.cs" />

tests/Perspex.RenderTests/Shapes/LineTests.cs

@@ -0,0 +1,43 @@
+// Copyright (c) The Perspex Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using Perspex.Controls;
+using Perspex.Controls.Shapes;
+using Perspex.Media;
+using Xunit;
+
+#if PERSPEX_CAIRO
+namespace Perspex.Cairo.RenderTests.Shapes
+#elif PERSPEX_SKIA
+namespace Perspex.Skia.RenderTests
+#else
+namespace Perspex.Direct2D1.RenderTests.Shapes
+#endif
+{
+    public class LineTests : TestBase
+    {
+        public LineTests()
+            : base(@"Shapes\Line")
+        {
+        }
+
+        [Fact]
+        public void Circle_1px_Stroke()
+        {
+            Decorator target = new Decorator
+            {
+                Padding = new Thickness(8),
+                Width = 200,
+                Height = 200,
+                Child = new Line
+                {
+                    Stroke = Brushes.Black,
+                    StrokeThickness = 1,
+                }
+            };
+
+            RenderToFile(target);
+            CompareImages();
+        }
+    }
+}