Create EllipseDrawable.cs

VectorPaint/ViewModels/Drawables/EllipseDrawable.cs

@@ -0,0 +1,62 @@
+using Avalonia;
+using Avalonia.Media;
+using Avalonia.Media.Immutable;
+using ReactiveUI;
+
+namespace VectorPaint.ViewModels.Drawables;
+
+public class EllipseDrawable : GeometryDrawable
+{
+    private PointDrawable? _topLeft;
+    private PointDrawable? _bottomRight;
+
+    public PointDrawable? TopLeft
+    {
+        get => _topLeft;
+        set => this.RaiseAndSetIfChanged(ref _topLeft, value);
+    }
+
+    public PointDrawable? BottomRight
+    {
+        get => _bottomRight;
+        set => this.RaiseAndSetIfChanged(ref _bottomRight, value);
+    }
+
+    public EllipseDrawable()
+    {
+        Brush = new ImmutableSolidColorBrush(Colors.Yellow);
+        Pen = new ImmutablePen(new ImmutableSolidColorBrush(Colors.Red), 2, null, PenLineCap.Round, PenLineJoin.Miter, 10D);
+    }
+
+    public override void Move(Vector delta)
+    {
+        if (_topLeft is { } && _bottomRight is { })
+        {
+            _topLeft.Move(delta);
+            _bottomRight.Move(delta);
+            Geometry = CreateGeometry();
+        }
+    }
+
+    private Rect ToRect()
+    {
+        if (_topLeft is null || _bottomRight is null)
+        {
+            return Rect.Empty;
+        }
+
+        return new Rect(
+            new Point(_topLeft.X, _topLeft.Y),
+            new Point(_bottomRight.X, _bottomRight.Y));
+    }
+
+    protected sealed override Geometry? CreateGeometry()
+    {
+        if (_topLeft is null || _bottomRight is null)
+        {
+            return null;
+        }
+
+        return new EllipseGeometry(ToRect());
+    }
+}