protected internal override void DoDraw(SvgDrawContext context)
{
if (this.attributesAndStyles != null)
{
String elementToReUse = this.attributesAndStyles.Get(SvgConstants.Attributes.XLINK_HREF);
if (elementToReUse == null)
{
elementToReUse = this.attributesAndStyles.Get(SvgConstants.Attributes.HREF);
}
if (elementToReUse != null && !String.IsNullOrEmpty(elementToReUse) && IsValidHref(elementToReUse))
{
String normalizedName = SvgTextUtil.FilterReferenceValue(elementToReUse);
if (!context.IsIdUsedByUseTagBefore(normalizedName))
{
ISvgNodeRenderer template = context.GetNamedObject(normalizedName);
//Clone template
ISvgNodeRenderer namedObject = template == null ? null : template.CreateDeepCopy();
//Resolve parent inheritance
SvgNodeRendererInheritanceResolver iresolver = new SvgNodeRendererInheritanceResolver();
iresolver.ApplyInheritanceToSubTree(this, namedObject);
if (namedObject != null)
{
if (namedObject is AbstractSvgNodeRenderer)
{
((AbstractSvgNodeRenderer)namedObject).SetPartOfClipPath(partOfClipPath);
}
PdfCanvas currentCanvas = context.GetCurrentCanvas();
float x = 0f;
float y = 0f;
if (this.attributesAndStyles.ContainsKey(SvgConstants.Attributes.X))
{
x = CssUtils.ParseAbsoluteLength(this.attributesAndStyles.Get(SvgConstants.Attributes.X));
}
if (this.attributesAndStyles.ContainsKey(SvgConstants.Attributes.Y))
{
y = CssUtils.ParseAbsoluteLength(this.attributesAndStyles.Get(SvgConstants.Attributes.Y));
}
AffineTransform inverseMatrix = null;
if (!CssUtils.CompareFloats(x, 0) || !CssUtils.CompareFloats(y, 0))
{
AffineTransform translation = AffineTransform.GetTranslateInstance(x, y);
currentCanvas.ConcatMatrix(translation);
if (partOfClipPath)
{
try {
inverseMatrix = translation.CreateInverse();
}
catch (NoninvertibleTransformException ex) {
LogManager.GetLogger(typeof(UseSvgNodeRenderer)).Warn(SvgLogMessageConstant.NONINVERTIBLE_TRANSFORMATION_MATRIX_USED_IN_CLIP_PATH
, ex);
}
}
}
// setting the parent of the referenced element to this instance
namedObject.SetParent(this);
namedObject.Draw(context);
// unsetting the parent of the referenced element
namedObject.SetParent(null);
if (inverseMatrix != null)
{
currentCanvas.ConcatMatrix(inverseMatrix);
}
}
}
}
}
}