public WpfTextRendering(SvgElement element)
: base(element)
{
_textElement = element as SvgTextElement;
if (_textElement == null)
{
throw new InvalidOperationException();
}
_horzRenderer = new WpfHorzTextRenderer(_textElement, this);
_vertRenderer = new WpfVertTextRenderer(_textElement, this);
_pathRenderer = new WpfPathTextRenderer(_textElement, this);
}
protected WpfTextRenderer(SvgTextElement textElement, WpfTextRendering textRendering)
{
if (textElement == null)
{
throw new ArgumentNullException("textElement",
"The SVG text element is required, and cannot be null (or Nothing).");
}
if (textRendering == null)
{
throw new ArgumentNullException("textRendering",
"The text rendering object is required, and cannot be null (or Nothing).");
}
_textElement = textElement;
_textRendering = textRendering;
}
public WpfVertTextRenderer(SvgTextElement textElement, WpfTextRendering textRendering)
: base(textElement, textRendering)
{
}
private void RenderTextPath(SvgTextElement element, SvgTextPathElement textPath,
ref Point ctp, double rotate, WpfTextPlacement placement)
{
if (_pathRenderer == null)
{
return;
}
_pathRenderer.RenderSingleLineText(textPath, ref ctp, String.Empty, rotate, placement);
}
protected virtual void GetGraphicsPath(ref PointF ctp)
{
gp = new GraphicsPath();
if (this is SvgTextPositioningElement)
{
SvgTextPositioningElement tpElm = (SvgTextPositioningElement)this;
ctp = this.GetCurrentTextPosition(tpElm, ctp);
}
string sBaselineShift = GetPropertyValue("baseline-shift").Trim();
double shiftBy = 0;
if (sBaselineShift.Length > 0)
{
SvgTextElement textElement = this as SvgTextElement;
if (textElement == null)
{
textElement = (SvgTextElement)this.SelectSingleNode("ancestor::svg:text", this.OwnerDocument.NamespaceManager);
}
float textFontSize = textElement._getComputedFontSize();
if (sBaselineShift.EndsWith("%"))
{
shiftBy = SvgNumber.ParseToFloat(sBaselineShift.Substring(0, sBaselineShift.Length - 1)) / 100 * textFontSize;
}
else if (sBaselineShift == "sub")
{
shiftBy = -0.6F * textFontSize;
}
else if (sBaselineShift == "super")
{
shiftBy = 0.6F * textFontSize;
}
else if (sBaselineShift == "baseline")
{
shiftBy = 0;
}
else
{
shiftBy = SvgNumber.ParseToFloat(sBaselineShift);
}
}
foreach (XmlNode child in this.ChildNodes)
{
gp.StartFigure();
if (child.NodeType == XmlNodeType.Text)
{
ctp.Y -= (float)shiftBy;
this.AddGraphicsPath(ref ctp, GetText(child));
ctp.Y += (float)shiftBy;
}
else if (child is SvgTRefElement)
{
SvgTRefElement trChild = (SvgTRefElement)child;
trChild.GetGraphicsPath(ref ctp);
}
else if (child is SvgTextContentElement)
{
SvgTextContentElement tcChild = (SvgTextContentElement)child;
tcChild.GetGraphicsPath(ref ctp);
}
}
}