Create EllipseTool.cs

VectorPaint/ViewModels/Tools/EllipseTool.cs

@@ -0,0 +1,62 @@
+using Avalonia.Input;
+using VectorPaint.ViewModels.Drawables;
+
+namespace VectorPaint.ViewModels.Tools;
+
+public class EllipseTool : Tool
+{
+    private EllipseDrawable? _ellipse;
+
+    public override string Title => "Ellipse";
+
+    public override void OnPointerPressed(IDrawing drawing, PointerPressedEventArgs e)
+    {
+        var point = e.GetCurrentPoint(drawing.Input).Position;
+
+        _ellipse = new EllipseDrawable()
+        {
+            TopLeft = new PointDrawable(point.X, point.Y),
+            BottomRight = new PointDrawable(point.X, point.Y)
+        };
+        drawing.Drawables.Add(_ellipse);
+
+        e.Pointer.Capture(drawing.Input);
+        e.Handled = true;
+
+        drawing.Invalidate();
+    }
+
+    public override void OnPointerReleased(IDrawing drawing, PointerReleasedEventArgs e)
+    {
+        if (!Equals(e.Pointer.Captured, drawing.Input))
+        {
+            return;
+        }
+
+        if (_ellipse is { })
+        {
+            e.Pointer.Capture(null);
+            _ellipse = null;
+        }
+    }
+
+    public override void OnPointerMoved(IDrawing drawing, PointerEventArgs e)
+    {
+        if (!Equals(e.Pointer.Captured, drawing.Input))
+        {
+            return;
+        }
+
+        if (_ellipse?.BottomRight is { })
+        {
+            var point = e.GetCurrentPoint(drawing.Input).Position;
+
+            _ellipse.BottomRight.X = point.X;
+            _ellipse.BottomRight.Y = point.Y;
+            _ellipse.Invalidate();
+
+            drawing.Invalidate();
+            e.Handled = true;
+        }
+    }
+}