Merge pull request #1342 from AvaloniaUI/fixes/1341-transformed-geometry

Preserve Shape's defining geometry transform.

src/Avalonia.Controls/Shapes/Shape.cs

@@ -61,12 +61,26 @@ namespace Avalonia.Controls.Shapes
         {
             get
             {
-                if (_renderedGeometry == null)
+                if (_renderedGeometry == null && DefiningGeometry != null)
                 {
-                    if (DefiningGeometry != null)
+                    if (_transform == Matrix.Identity)
+                    {
+                        _renderedGeometry = DefiningGeometry;
+                    }
+                    else
                     {
                         _renderedGeometry = DefiningGeometry.Clone();
-                        _renderedGeometry.Transform = new MatrixTransform(_transform);
+
+                        if (_renderedGeometry.Transform == null ||
+                            _renderedGeometry.Transform.Value == Matrix.Identity)
+                        {
+                            _renderedGeometry.Transform = new MatrixTransform(_transform);
+                        }
+                        else
+                        {
+                            _renderedGeometry.Transform = new MatrixTransform(
+                                _renderedGeometry.Transform.Value * _transform);
+                        }
                     }
                 }
 
@@ -193,6 +207,7 @@ namespace Avalonia.Controls.Shapes
 
             return finalSize;
         }
+
         private Size CalculateShapeSizeAndSetTransform(Size availableSize)
         {
             // This should probably use GetRenderBounds(strokeThickness) but then the calculations

tests/Avalonia.RenderTests/Shapes/PathTests.cs

@@ -362,5 +362,28 @@ namespace Avalonia.Direct2D1.RenderTests.Shapes
             await RenderToFile(target);
             CompareImages();
         }
+
+        [Fact]
+        public async Task Path_With_Rotated_Geometry()
+        {
+            var target = new Border
+            {
+                Width = 200,
+                Height = 200,
+                Background = Brushes.White,
+                Child = new Path
+                {
+                    Fill = Brushes.Red,
+                    Data = new RectangleGeometry
+                    {
+                        Rect = new Rect(50, 50, 100, 100),
+                        Transform = new RotateTransform(45),
+                    }
+                }
+            };
+
+            await RenderToFile(target);
+            CompareImages();
+        }
     }
 }