public override void BeforeRender(WpfDrawingRenderer renderer) { base.BeforeRender(renderer); _idElement = string.Empty; WpfDrawingContext context = renderer.Context; DrawingGroup currentGroup = context.Peek(); if (currentGroup == null) { throw new InvalidOperationException("An existing group is expected."); } if (currentGroup == context.Root) { if (context.IsFragment) { // Do not add extra layer to fragments... _drawGroup = currentGroup; } else { _drawGroup = new DrawingGroup(); SvgObject.SetName(_drawGroup, SvgObject.DrawLayer); if (context.IncludeRuntime) { SvgLink.SetKey(_drawGroup, SvgObject.DrawLayer); } currentGroup.Children.Add(_drawGroup); context.Push(_drawGroup); } } else { _drawGroup = new DrawingGroup(); currentGroup.Children.Add(_drawGroup); context.Push(_drawGroup); } SvgPatternElement svgElm = (SvgPatternElement)_svgElement; _idElement = svgElm.Id; if (!string.IsNullOrWhiteSpace(_idElement)) { context.AddUrl(_idElement); } double x = Math.Round(svgElm.X.AnimVal.Value, 4); double y = Math.Round(svgElm.Y.AnimVal.Value, 4); double width = Math.Round(svgElm.Width.AnimVal.Value, 4); double height = Math.Round(svgElm.Height.AnimVal.Value, 4); if (width < 0 || height < 0) { // For invalid dimension, prevent the drawing of the children... _isRecursive = true; return; } Rect elmRect = new Rect(x, y, width, height); // XmlNode parentNode = _svgElement.ParentNode; ISvgFitToViewBox fitToView = svgElm as ISvgFitToViewBox; ISvgAnimatedPreserveAspectRatio preserveAspectRatio = null; if (fitToView != null && fitToView.PreserveAspectRatio != null) { preserveAspectRatio = fitToView.PreserveAspectRatio; ISvgAnimatedRect animRect = fitToView.ViewBox; if (animRect != null) { ISvgRect viewRect = animRect.AnimVal; if (viewRect != null) { Rect wpfViewRect = WpfConvert.ToRect(viewRect); if (!wpfViewRect.IsEmpty && wpfViewRect.Width > 0 && wpfViewRect.Height > 0) { elmRect = wpfViewRect; } } } } Transform transform = null; var aspectRatio = (preserveAspectRatio != null) ? preserveAspectRatio.AnimVal : null; if (aspectRatio != null /* && aspectRatio.Align == SvgPreserveAspectRatioType.None*/) { FitToViewbox(context, elmRect); transform = this.Transform; if (transform != null) { _drawGroup.Transform = transform; } } }