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;
}
}
}