/// <summary>Gets the ascentline for the text (i.e.</summary>
/// <remarks>
/// Gets the ascentline for the text (i.e. the line that represents the topmost extent that a string of the current font could have)
/// This value includes the Rise of the draw operation - see
/// <see cref="GetRise()"/>
/// for the amount added by Rise
/// </remarks>
/// <returns>the ascentline line segment</returns>
public virtual LineSegment GetAscentLine()
{
float ascent = gs.GetFont().GetFontProgram().GetFontMetrics().GetTypoAscender() * gs.GetFontSize() / 1000f;
return(GetUnscaledBaselineWithOffset(ascent + gs.GetTextRise()).TransformBy(textToUserSpaceTransformMatrix
));
}
private void WriteText(String @operator, IList <PdfObject> operands, PdfArray cleanedText, PdfCanvas canvas
)
{
CanvasGraphicsState canvasGs = canvas.GetGraphicsState();
bool newLineShowText = "'".Equals(@operator) || "\"".Equals(@operator);
if (newLineShowText)
{
if (canvasGs.GetLeading() != currLeading)
{
canvas.SetLeading((float)currLeading);
}
// after new line operator, removed text shift doesn't matter
removedTextShift = null;
}
PdfTextArray tjShiftArray = null;
if (removedTextShift != null)
{
float tjShift = (float)removedTextShift * 1000 / (canvasGs.GetFontSize() * canvasGs.GetHorizontalScaling()
/ 100);
tjShiftArray = new PdfTextArray();
tjShiftArray.Add(new PdfNumber(tjShift));
}
if (cleanedText != null)
{
if (newLineShowText)
{
// char spacing and word spacing are set via writeNotAppliedTextStateParams() method
canvas.NewlineText();
}
if (removedTextShift != null)
{
tjShiftArray.AddAll(cleanedText);
cleanedText = tjShiftArray;
}
canvas.ShowText(cleanedText);
}
else
{
if (removedTextShift != null)
{
canvas.ShowText(tjShiftArray);
}
PdfCleanUpProcessor.WriteOperands(canvas, operands);
}
}
/// <summary>Provides detail useful if a listener needs access to the position of each individual glyph in the text render operation
/// </summary>
/// <returns>
/// A list of
/// <see cref="TextRenderInfo"/>
/// objects that represent each glyph used in the draw operation. The next effect is if there was a separate Tj opertion for each character in the rendered string
/// </returns>
public virtual IList <iText.Kernel.Pdf.Canvas.Parser.Data.TextRenderInfo> GetCharacterRenderInfos()
{
IList <iText.Kernel.Pdf.Canvas.Parser.Data.TextRenderInfo> rslt = new List <iText.Kernel.Pdf.Canvas.Parser.Data.TextRenderInfo
>(@string.GetValue().Length);
PdfString[] strings = SplitString(@string);
float totalWidth = 0;
foreach (PdfString str in strings)
{
float[] widthAndWordSpacing = GetWidthAndWordSpacing(str);
iText.Kernel.Pdf.Canvas.Parser.Data.TextRenderInfo subInfo = new iText.Kernel.Pdf.Canvas.Parser.Data.TextRenderInfo
(this, str, totalWidth);
rslt.Add(subInfo);
totalWidth += (widthAndWordSpacing[0] * gs.GetFontSize() + gs.GetCharSpacing() + widthAndWordSpacing[1]) *
(gs.GetHorizontalScaling() / 100f);
}
foreach (iText.Kernel.Pdf.Canvas.Parser.Data.TextRenderInfo tri in rslt)
{
tri.GetUnscaledWidth();
}
return(rslt);
}
