private void RenderTextPath(SvgTextContentElement element, WpfPathTextBuilder pathBuilder,
string text, Point origin, double rotate, WpfTextPlacement placement)
{
if (string.IsNullOrWhiteSpace(text))
{
return;
}
WpfSvgPaint fillPaint = new WpfSvgPaint(_context, element, "fill");
WpfSvgPaint strokePaint = new WpfSvgPaint(_context, element, "stroke");
Brush textBrush = fillPaint.GetBrush();
Pen textPen = strokePaint.GetPen();
if (textBrush == null && textPen == null)
{
return;
}
double emSize = GetComputedFontSize(element);
var fontFamilyInfo = GetTextFontFamilyInfo(element);
WpfTextStringFormat stringFormat = GetTextStringFormat(element);
// Fix the use of Postscript fonts...
WpfFontFamilyVisitor fontFamilyVisitor = _context.FontFamilyVisitor;
if (!string.IsNullOrWhiteSpace(_actualFontName) && fontFamilyVisitor != null)
{
WpfFontFamilyInfo familyInfo = fontFamilyVisitor.Visit(_actualFontName,
fontFamilyInfo, _context);
if (familyInfo != null && !familyInfo.IsEmpty)
{
fontFamilyInfo = familyInfo;
}
}
// Create the text builder object defined by the font family information
WpfTextBuilder textBuilder = WpfTextBuilder.Create(fontFamilyInfo, this.TextCulture, emSize);
textBuilder.TextDecorations = GetTextDecoration(element);
textBuilder.TextAlignment = stringFormat.Alignment;
// This is character-by-character placement, text-alignment will distort the view...
textBuilder.TextAlignment = TextAlignment.Left;
// Create the path-run information holder for this render request...
WpfPathTextRun textPathRun = new WpfPathTextRun(element, textBuilder);
// Finally, register the path-run with path builder...
pathBuilder.AddTextRun(textPathRun, text, origin, textBrush, textPen);
}
private void RenderTextRun(WpfTextTuple textInfo, ref Point ctp,
string text, double rotate, WpfTextPlacement placement)
{
if (string.IsNullOrWhiteSpace(text))
{
return;
}
WpfFontFamilyInfo familyInfo = textInfo.Item1;
double emSize = textInfo.Item2;
WpfTextStringFormat stringFormat = textInfo.Item3;
SvgTextContentElement element = textInfo.Item4;
FontFamily fontFamily = familyInfo.Family;
FontWeight fontWeight = familyInfo.Weight;
FontStyle fontStyle = familyInfo.Style;
FontStretch fontStretch = familyInfo.Stretch;
WpfSvgPaint fillPaint = new WpfSvgPaint(_context, element, "fill");
Brush textBrush = fillPaint.GetBrush();
WpfSvgPaint strokePaint = new WpfSvgPaint(_context, element, "stroke");
Pen textPen = strokePaint.GetPen();
if (textBrush == null && textPen == null)
{
return;
}
if (textBrush == null)
{
// If here, then the pen is not null, and so the fill cannot be null.
// We set this to transparent for stroke only text path...
textBrush = Brushes.Transparent;
}
if (textPen != null)
{
textPen.LineJoin = PenLineJoin.Miter; // Better for text rendering
textPen.MiterLimit = 1;
}
TextDecorationCollection textDecors = GetTextDecoration(element);
if (textDecors == null)
{
SvgTextElement textElement = element.ParentNode as SvgTextElement;
if (textElement != null)
{
textDecors = GetTextDecoration(textElement);
}
}
TextAlignment alignment = stringFormat.Alignment;
bool hasWordSpacing = false;
string wordSpaceText = element.GetAttribute("word-spacing");
double wordSpacing = 0;
if (!string.IsNullOrWhiteSpace(wordSpaceText) &&
double.TryParse(wordSpaceText, out wordSpacing) && !wordSpacing.Equals(0))
{
hasWordSpacing = true;
}
bool hasLetterSpacing = false;
string letterSpaceText = element.GetAttribute("letter-spacing");
double letterSpacing = 0;
if (!string.IsNullOrWhiteSpace(letterSpaceText) &&
double.TryParse(letterSpaceText, out letterSpacing) && !letterSpacing.Equals(0))
{
hasLetterSpacing = true;
}
bool isRotatePosOnly = false;
IList <WpfTextPosition> textPositions = null;
int textPosCount = 0;
if ((placement != null && placement.HasPositions))
{
textPositions = placement.Positions;
textPosCount = textPositions.Count;
isRotatePosOnly = placement.IsRotateOnly;
}
WpfTextBuilder textBuilder = WpfTextBuilder.Create(familyInfo, this.TextCulture, emSize);
this.IsTextPath = true;
if (textPositions != null && textPositions.Count != 0)
{
if (textPositions.Count == text.Trim().Length) //TODO: Best way to handle this...
{
text = text.Trim();
}
}
if (hasLetterSpacing || hasWordSpacing || textPositions != null)
{
double spacing = Convert.ToDouble(letterSpacing);
int startSpaces = 0;
for (int i = 0; i < text.Length; i++)
{
if (char.IsWhiteSpace(text[i]))
{
startSpaces++;
}
else
{
break;
}
}
int j = 0;
string inputText = string.Empty;
for (int i = 0; i < text.Length; i++)
{
// Avoid rendering only spaces at the start of text run...
if (i == 0 && startSpaces != 0)
{
inputText = text.Substring(0, startSpaces + 1);
i += startSpaces;
}
else
{
inputText = new string(text[i], 1);
}
if (this.IsMeasuring)
{
var textSize = textBuilder.MeasureText(element, inputText);
this.AddTextWidth(ctp, textSize.Width);
continue;
}
textBuilder.Trimming = stringFormat.Trimming;
textBuilder.TextAlignment = stringFormat.Alignment;
if (textDecors != null && textDecors.Count != 0)
{
textBuilder.SetTextDecorations(textDecors);
}
WpfTextPosition?textPosition = null;
if (textPositions != null && j < textPosCount)
{
textPosition = textPositions[j];
}
//float xCorrection = 0;
//if (alignment == TextAlignment.Left)
// xCorrection = emSize * 1f / 6f;
//else if (alignment == TextAlignment.Right)
// xCorrection = -emSize * 1f / 6f;
double yCorrection = textBuilder.Baseline;
float rotateAngle = (float)rotate;
if (textPosition != null)
{
if (!isRotatePosOnly)
{
Point pt = textPosition.Value.Location;
ctp.X = pt.X;
ctp.Y = pt.Y;
}
rotateAngle = (float)textPosition.Value.Rotation;
}
Point textStart = ctp;
RotateTransform rotateAt = null;
if (!rotateAngle.Equals(0))
{
rotateAt = new RotateTransform(rotateAngle, textStart.X, textStart.Y);
_drawContext.PushTransform(rotateAt);
}
Point textPoint = new Point(ctp.X, ctp.Y - yCorrection);
Geometry textGeometry = textBuilder.Build(element, inputText, textPoint.X, textPoint.Y);
if (textGeometry != null && !textGeometry.IsEmpty())
{
_drawContext.DrawGeometry(textBrush, textPen,
ExtractTextPathGeometry(textGeometry));
this.IsTextPath = true;
}
//float bboxWidth = (float)formattedText.Width;
double bboxWidth = textGeometry.Bounds.Width;
if (alignment == TextAlignment.Center)
{
bboxWidth /= 2f;
}
else if (alignment == TextAlignment.Right)
{
bboxWidth = 0;
}
//ctp.X += bboxWidth + emSize / 4 + spacing;
if (hasLetterSpacing)
{
ctp.X += bboxWidth + letterSpacing;
}
if (hasWordSpacing && char.IsWhiteSpace(text[i]))
{
if (hasLetterSpacing)
{
ctp.X += wordSpacing;
}
else
{
ctp.X += bboxWidth + wordSpacing;
}
}
else
{
if (!hasLetterSpacing)
{
ctp.X += bboxWidth;
}
}
if (rotateAt != null)
{
_drawContext.Pop();
}
j++;
}
}
else
{
if (this.IsMeasuring)
{
var textSize = textBuilder.MeasureText(element, text);
this.AddTextWidth(ctp, textSize.Width);
return;
}
var textContext = this.TextContext;
if (textContext != null && textContext.IsPositionChanged(element) == false)
{
if (alignment == TextAlignment.Center && this.TextWidth > 0)
{
alignment = TextAlignment.Left;
}
}
textBuilder.TextAlignment = alignment;
textBuilder.Trimming = stringFormat.Trimming;
if (textDecors != null && textDecors.Count != 0)
{
textBuilder.SetTextDecorations(textDecors);
}
//float xCorrection = 0;
//if (alignment == TextAlignment.Left)
// xCorrection = emSize * 1f / 6f;
//else if (alignment == TextAlignment.Right)
// xCorrection = -emSize * 1f / 6f;
double yCorrection = textBuilder.Baseline;
float rotateAngle = (float)rotate;
Point textPoint = new Point(ctp.X, ctp.Y - yCorrection);
RotateTransform rotateAt = null;
if (!rotateAngle.Equals(0))
{
rotateAt = new RotateTransform(rotateAngle, ctp.X, ctp.Y);
_drawContext.PushTransform(rotateAt);
}
Geometry textGeometry = textBuilder.Build(element, text, textPoint.X, textPoint.Y);
if (textGeometry != null && !textGeometry.IsEmpty())
{
_drawContext.DrawGeometry(textBrush, textPen,
ExtractTextPathGeometry(textGeometry));
}
//float bboxWidth = (float)formattedText.Width;
// double bboxWidth = textGeometry.Bounds.Width;
double bboxWidth = textBuilder.Width;
if (alignment == TextAlignment.Center)
{
bboxWidth /= 2f;
}
else if (alignment == TextAlignment.Right)
{
bboxWidth = 0;
}
//ctp.X += bboxWidth + emSize / 4;
ctp.X += bboxWidth;
if (rotateAt != null)
{
_drawContext.Pop();
}
}
}