private DrawingGroup CreateOuterGroup()
{
DrawingGroup drawGroup = null;
SvgSymbolElement svgElm = (SvgSymbolElement)_svgElement;
ISvgAnimatedPreserveAspectRatio animatedAspectRatio = svgElm.PreserveAspectRatio;
if (animatedAspectRatio == null || animatedAspectRatio.AnimVal == null)
{
return(drawGroup);
}
double x = svgElm.X.AnimVal.Value;
double y = svgElm.Y.AnimVal.Value;
double width = svgElm.Width.AnimVal.Value;
double height = svgElm.Height.AnimVal.Value;
Rect clipRect = new Rect(x, y, width, height);
if (!clipRect.IsEmpty)
{
drawGroup = new DrawingGroup();
drawGroup.ClipGeometry = new RectangleGeometry(clipRect);
}
return(drawGroup);
}
public virtual void VisitSymbolElement(SvgSymbolElement element) => DefaultVisit(element);
public override void BeforeRender(WpfDrawingRenderer renderer)
{
base.BeforeRender(renderer);
WpfDrawingContext context = renderer.Context;
Geometry clipGeom = this.ClipGeometry;
Transform transform = this.Transform;
if (transform == null &&
(_svgElement.FirstChild != null && _svgElement.FirstChild == _svgElement.LastChild))
{
try
{
SvgUseElement useElement = (SvgUseElement)_svgElement;
// If none of the following attribute exists, an exception is thrown...
double x = useElement.X.AnimVal.Value;
double y = useElement.Y.AnimVal.Value;
double width = useElement.Width.AnimVal.Value;
double height = useElement.Height.AnimVal.Value;
if (width > 0 && height > 0)
{
Rect elementBounds = new Rect(x, y, width, height);
// Try handling the cases of "symbol" and "svg" sources within the "use"...
XmlNode childNode = _svgElement.FirstChild;
string childName = childNode.Name;
if (String.Equals(childName, "symbol", StringComparison.OrdinalIgnoreCase))
{
SvgSymbolElement symbolElement = (SvgSymbolElement)childNode;
this.FitToViewbox(context, symbolElement, elementBounds);
}
}
transform = this.Transform;
}
catch
{
}
}
if (transform != null)
{
try
{
SvgUseElement useElement = (SvgUseElement)_svgElement;
// If none of the following attribute exists, an exception is thrown...
double x = useElement.X.AnimVal.Value;
double y = useElement.Y.AnimVal.Value;
double width = useElement.Width.AnimVal.Value;
double height = useElement.Height.AnimVal.Value;
if (width > 0 && height > 0)
{
Rect elementBounds = new Rect(x, y, width, height);
// Try handling the cases of "symbol" and "svg" sources within the "use"...
XmlNode childNode = _svgElement.FirstChild;
string childName = childNode.Name;
if (String.Equals(childName, "symbol", StringComparison.OrdinalIgnoreCase))
{
SvgSymbolElement symbolElement = (SvgSymbolElement)childNode;
this.FitToViewbox(context, symbolElement, elementBounds);
}
}
Transform symbolTransform = this.Transform;
if (symbolTransform != null && !symbolTransform.Value.IsIdentity)
{
TransformGroup combinedTransform = new TransformGroup();
combinedTransform.Children.Add(transform);
combinedTransform.Children.Add(symbolTransform);
transform = combinedTransform;
}
}
catch
{
}
}
if (clipGeom != null || transform != null)
{
_drawGroup = new DrawingGroup();
DrawingGroup currentGroup = context.Peek();
if (currentGroup == null)
{
throw new InvalidOperationException("An existing group is expected.");
}
currentGroup.Children.Add(_drawGroup);
context.Push(_drawGroup);
if (clipGeom != null)
{
_drawGroup.ClipGeometry = clipGeom;
}
if (transform != null)
{
_drawGroup.Transform = transform;
}
}
}
public override void BeforeRender(WpfDrawingRenderer renderer)
{
base.BeforeRender(renderer);
WpfDrawingContext context = renderer.Context;
_drawGroup = new DrawingGroup();
if (context.Count == 0)
{
context.Push(_drawGroup);
context.Root = _drawGroup;
}
else if (context.Count == 1)
{
DrawingGroup currentGroup = context.Peek();
if (currentGroup == null)
{
throw new InvalidOperationException("An existing group is expected.");
}
if (currentGroup == context.Root && !context.IsFragment)
{
SvgObject.SetName(_drawGroup, SvgObject.DrawLayer);
if (context.IncludeRuntime)
{
SvgLink.SetKey(_drawGroup, SvgObject.DrawLayer);
}
}
currentGroup.Children.Add(_drawGroup);
context.Push(_drawGroup);
}
else
{
DrawingGroup currentGroup = context.Peek();
if (currentGroup == null)
{
throw new InvalidOperationException("An existing group is expected.");
}
currentGroup.Children.Add(_drawGroup);
context.Push(_drawGroup);
}
SvgSymbolElement svgElm = (SvgSymbolElement)_svgElement;
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);
Rect elmRect = new Rect(x, y, width, height);
XmlNode parentNode = _svgElement.ParentNode;
ISvgFitToViewBox fitToView = svgElm as ISvgFitToViewBox;
if (fitToView != null)
{
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;
}
}
}
}
FitToViewbox(context, elmRect);
Transform transform = this.Transform;
if (transform != null)
{
_drawGroup.Transform = transform;
}
if (!elmRect.IsEmpty && !elmRect.Width.Equals(0) && !elmRect.Height.Equals(0))
{
// Elements such as "pattern" are also rendered by this renderer, so we make sure we are
// dealing with the root SVG element...
if (parentNode != null && parentNode.NodeType == XmlNodeType.Document)
{
_drawGroup.ClipGeometry = new RectangleGeometry(elmRect);
}
else
{
if (transform != null)
{
// We have already applied the transform, which will translate to the start point...
if (transform is TranslateTransform)
{
_drawGroup.ClipGeometry = new RectangleGeometry(
new Rect(0, 0, elmRect.Width, elmRect.Height));
}
else
{
_drawGroup.ClipGeometry = new RectangleGeometry(elmRect);
}
}
else
{
_drawGroup.ClipGeometry = new RectangleGeometry(elmRect);
}
}
}
}
private void OnAfterRender(WpfDrawingRenderer renderer)
{
Debug.Assert(_drawGroup != null);
WpfDrawingContext context = renderer.Context;
DrawingGroup currentGroup = context.Peek();
if (currentGroup == null || currentGroup != _drawGroup)
{
throw new InvalidOperationException("An existing group is expected.");
}
context.Pop();
DrawingGroup drawGroup = CreateOuterGroup();
if (drawGroup == null)
{
return;
}
SvgSymbolElement symbolElement = (SvgSymbolElement)_svgElement;
var transform = _drawGroup.Transform;
Transform useTransform = null;
XmlNode childNode = _svgElement.FirstChild;
string childName = childNode.Name;
try
{
// If none of the following attribute exists, an exception is thrown...
double x = symbolElement.X.AnimVal.Value;
double y = symbolElement.Y.AnimVal.Value;
double width = symbolElement.Width.AnimVal.Value;
double height = symbolElement.Height.AnimVal.Value;
if (width > 0 && height > 0)
{
Rect elementBounds = new Rect(x, y, width, height);
useTransform = this.UseFitToViewbox(symbolElement, elementBounds);
}
}
catch (Exception ex)
{
Trace.TraceError(ex.ToString());
}
if (useTransform != null)
{
if (transform == null)
{
transform = useTransform;
}
else // if (transform != null)
{
transform = Combine(useTransform, transform, true);
}
}
_drawGroup.Transform = transform;
currentGroup = context.Peek();
if (currentGroup == null || currentGroup.Children.Remove(_drawGroup) == false)
{
return;
}
drawGroup.Children.Add(_drawGroup);
currentGroup.Children.Add(drawGroup);
}
public override PageElement VisitSymbolElement(SvgSymbolElement element) => null;
