diff --git a/src/Windows/Avalonia.Direct2D1/Media/GeometryImpl.cs b/src/Windows/Avalonia.Direct2D1/Media/GeometryImpl.cs index d04e2b3110..81c21c8648 100644 --- a/src/Windows/Avalonia.Direct2D1/Media/GeometryImpl.cs +++ b/src/Windows/Avalonia.Direct2D1/Media/GeometryImpl.cs @@ -1,3 +1,4 @@ +using Avalonia.Logging; using Avalonia.Platform; using SharpDX.Direct2D1; @@ -8,6 +9,8 @@ namespace Avalonia.Direct2D1.Media /// public abstract class GeometryImpl : IGeometryImpl { + private const float ContourApproximation = 0.0001f; + public GeometryImpl(Geometry geometry) { Geometry = geometry; @@ -16,6 +19,9 @@ namespace Avalonia.Direct2D1.Media /// public Rect Bounds => Geometry.GetWidenedBounds(0).ToAvalonia(); + /// + public double ContourLength => Geometry.ComputeLength(null, ContourApproximation); + public Geometry Geometry { get; } /// @@ -57,6 +63,24 @@ namespace Avalonia.Direct2D1.Media transform.ToDirect2D()), this); } + + /// + public bool TryGetPointAtDistance(double distance, out Point point) + { + Geometry.ComputePointAtLength((float)distance, ContourApproximation, out var tangentVector); + point = new Point(tangentVector.X, tangentVector.Y); + return true; + } + + /// + public bool TryGetPointAndTangentAtDistance(double distance, out Point point, out Point tangent) + { + // Direct2D doesnt have this sadly. + Logger.TryGet(LogEventLevel.Warning, LogArea.Visual)?.Log(this, "TryGetPointAndTangentAtDistance is not available in Direct2D."); + point = new Point(); + tangent = new Point(); + return false; + } protected virtual Geometry GetSourceGeometry() => Geometry; }