public static Size MeasureString(string text, double fontSize, PdfFont font)
{
var width = font.GetWidth(text, (float)fontSize);
float ascent = font.GetAscent(text, (float)fontSize);
float descent = font.GetDescent(text, (float)fontSize);
var height = ascent - descent;
return(new Size((int)Math.Round(width), (int)Math.Round(height)));
}
protected Rectangle GetTextSize(string text, PdfFont pdfFont, float fontSize)
{
GlyphLine glyphLine = pdfFont.CreateGlyphLine(text);
int width = 0;
for (int i = 0; i < glyphLine.Size(); i++)
{
Glyph glyph = glyphLine.Get(i);
width += glyph.GetWidth();
}
float userSpaceWidth = width * fontSize / 1000.0f;
float ascent = pdfFont.GetAscent(text, fontSize);
float descent = pdfFont.GetDescent(text, fontSize);
float userSpaceHeight = ascent - descent;
return(new Rectangle(userSpaceWidth, userSpaceHeight));
}
public int GetFontSizeFittingMultiLinesInAcroForm(string multiLineString, float targetFieldWidth, float targetFieldHeight, PdfFont pdfFont, int defaultFontSize)
{
if (string.IsNullOrWhiteSpace(multiLineString))
{
return(defaultFontSize);
}
List <string> stringLines = new List <string>(multiLineString.Split(new[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries));
int lineNumRequired = 0;
int targetSize = defaultFontSize;
while (targetSize > 1)
{
foreach (var stringLine in stringLines)
{
float lineWidth = pdfFont.GetWidth(stringLine, targetSize);
int lineNumNeeded = (int)Math.Ceiling(lineWidth / targetFieldWidth);
lineNumRequired += lineNumNeeded;
}
float aboveBaseline = pdfFont.GetAscent(stringLines[0], targetSize);
float underBaseline = pdfFont.GetDescent(stringLines[0], targetSize);
float textHeight = aboveBaseline - underBaseline;
float lineHeight = textHeight * 1.5f;
int lineNumProvided = (int)Math.Floor(targetFieldHeight / lineHeight);
if (lineNumProvided > lineNumRequired)
{
break;
}
lineNumRequired = 0;
targetSize = targetSize - 1;
}
return(targetSize);
}
private void VerticalJustificationInAcroForm <T>(PdfFormField field, T detail, string propertyName, PdfFont pdfFont, PdfFontAttribute pdfFontAttribute)
{
var widgets = field.GetWidgets();
if (widgets == null || widgets.Count == 0)
{
throw new ArgumentNullException($"no widgets to the field");
}
PdfArray position = widgets.First().GetRectangle();
PdfPage page = field.GetWidgets().First().GetPage();
if (page == null)
{
throw new ArgumentNullException(
$"field widget annotation is not associated with any page");
}
int pageNum = _pdfDoc.GetPageNumber(page);
float width = (float)(position.GetAsNumber(2).GetValue() - position.GetAsNumber(0).GetValue());
float height = (float)(position.GetAsNumber(3).GetValue() - position.GetAsNumber(1).GetValue());
float llx = (float)position.GetAsNumber(0).GetValue();
float lly = (float)position.GetAsNumber(1).GetValue();
float urx = (float)position.GetAsNumber(2).GetValue();
float ury = (float)position.GetAsNumber(3).GetValue();
Rectangle rect = new Rectangle(llx, lly, width, height);
PdfCanvas canvas = new PdfCanvas(_pdfDoc, pageNum);
canvas.SetLineWidth(0f).Rectangle(rect);
string textValue = null;
Type type = detail.GetType();
PropertyInfo[] properties = type.GetProperties();
foreach (PropertyInfo property in properties)
{
if (property.Name == propertyName)
{
textValue = property.GetValue(detail, null).ToString();
}
}
if (string.IsNullOrWhiteSpace(textValue))
{
return;
}
float verticalAdjustment = 0;
var text = new Text(textValue);
if (pdfFont != null)
{
text.SetFont(pdfFont);
text.SetFontColor(pdfFontAttribute.Color);
if (pdfFontAttribute.Size != 0)
{
text.SetFontSize(pdfFontAttribute.Size);
}
verticalAdjustment = (pdfFont.GetWidth(textValue, pdfFontAttribute.Size) / (urx - llx)) * pdfFont.GetAscent(textValue, pdfFontAttribute.Size);
}
Paragraph p = new Paragraph(text);
if (pdfFontAttribute.Justification == PdfTextAlignment.CenterLeft ||
pdfFontAttribute.Justification == PdfTextAlignment.BottomLeft)
{
p.SetTextAlignment(iText.Layout.Properties.TextAlignment.LEFT);
}
if (pdfFontAttribute.Justification == PdfTextAlignment.CenterMiddle ||
pdfFontAttribute.Justification == PdfTextAlignment.BottomMiddle)
{
p.SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER);
}
if (pdfFontAttribute.Justification == PdfTextAlignment.CenterRight ||
pdfFontAttribute.Justification == PdfTextAlignment.BottomRight)
{
p.SetTextAlignment(iText.Layout.Properties.TextAlignment.RIGHT);
}
// set line space
p.SetMultipliedLeading(1);
if (pdfFontAttribute.Justification == PdfTextAlignment.CenterLeft ||
pdfFontAttribute.Justification == PdfTextAlignment.CenterMiddle ||
pdfFontAttribute.Justification == PdfTextAlignment.CenterRight)
{
new Canvas(canvas, _pdfDoc, rect)
.Add(p.SetFixedPosition(llx, (ury + lly) / 2 - verticalAdjustment, urx - llx));
}
if (pdfFontAttribute.Justification == PdfTextAlignment.BottomLeft ||
pdfFontAttribute.Justification == PdfTextAlignment.BottomMiddle ||
pdfFontAttribute.Justification == PdfTextAlignment.BottomRight)
{
new Canvas(canvas, _pdfDoc, rect).Add(p);
}
_form.RemoveField(field.GetFieldName().ToString());
}
