public static float CalculateHeightForLinesNumKeepTogetherCaseSpecific(Document doc, Paragraph p, float width
, float height, float linesNum)
{
ParagraphRenderer renderer = (ParagraphRenderer)p.CreateRendererSubTree().SetParent(doc.GetRenderer());
LayoutResult layoutRes = renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, 10000)))
);
int allLinesCount = renderer.GetLines().Count;
float lineHeight = layoutRes.GetOccupiedArea().GetBBox().GetHeight() / allLinesCount;
renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, height))));
int linesWithinOnePageCount = renderer.GetLines().Count;
return((allLinesCount - linesWithinOnePageCount - linesNum) * lineHeight);
}
/// <summary>Writes a log message reporting that orphans constraint is violated.</summary>
/// <remarks>
/// Writes a log message reporting that orphans constraint is violated.
/// This method is to be overridden if violation scenarios need to be handled in some other way.
/// </remarks>
/// <param name="renderer">a renderer processing orphans</param>
/// <param name="message">
///
/// <see cref="System.String"/>
/// explaining the reason for violation
/// </param>
public virtual void HandleViolatedOrphans(ParagraphRenderer renderer, String message)
{
ILog logger = LogManager.GetLogger(typeof(iText.Layout.Properties.ParagraphOrphansControl));
if (renderer.GetOccupiedArea() != null && renderer.GetLines() != null)
{
int pageNumber = renderer.GetOccupiedArea().GetPageNumber();
String warnText = MessageFormatUtil.Format(iText.IO.LogMessageConstant.ORPHANS_CONSTRAINT_VIOLATED, pageNumber
, minOrphans, renderer.GetLines().Count, message);
logger.Warn(warnText);
}
else
{
logger.Warn(iText.IO.LogMessageConstant.PREMATURE_CALL_OF_HANDLE_VIOLATION_METHOD);
}
}
/// <summary>Updates the font.</summary>
/// <param name="renderer">the renderer</param>
internal virtual void UpdatePdfFont(ParagraphRenderer renderer)
{
Object retrievedFont;
if (renderer != null)
{
IList <LineRenderer> lines = renderer.GetLines();
if (lines != null)
{
foreach (LineRenderer line in lines)
{
foreach (IRenderer child in line.GetChildRenderers())
{
retrievedFont = child.GetProperty <Object>(Property.FONT);
if (retrievedFont is PdfFont)
{
font = (PdfFont)retrievedFont;
return;
}
}
}
}
retrievedFont = renderer.GetProperty <Object>(Property.FONT);
if (retrievedFont is PdfFont)
{
font = (PdfFont)retrievedFont;
}
}
}
/// <summary>
/// Calculates font size according to given bbox height, width and selected
/// font.
/// </summary>
/// <param name="document">
/// PDF document as a
/// <see cref="iText.Layout.Document"/>
/// object
/// </param>
/// <param name="line">text line</param>
/// <param name="fontFamily">default font family</param>
/// <param name="bboxHeightPt">height of bbox calculated by OCR Reader</param>
/// <param name="bboxWidthPt">width of bbox calculated by OCR Reader</param>
/// <returns>font size</returns>
internal static float CalculateFontSize(Document document, String line, String fontFamily, float bboxHeightPt
, float bboxWidthPt)
{
Rectangle bbox = new Rectangle(bboxWidthPt * 1.5f, bboxHeightPt * 1.5f);
// setting minimum and maximum (approx.) values for font size
float fontSize = 1;
float maxFontSize = bbox.GetHeight();
try {
Paragraph paragraph = new Paragraph(line);
paragraph.SetWidth(bbox.GetWidth());
paragraph.SetFontFamily(fontFamily);
while (Math.Abs(fontSize - maxFontSize) > 1e-1)
{
float curFontSize = (fontSize + maxFontSize) / 2;
paragraph.SetFontSize(curFontSize);
ParagraphRenderer renderer = (ParagraphRenderer)paragraph.CreateRendererSubTree().SetParent(document.GetRenderer
());
LayoutContext context = new LayoutContext(new LayoutArea(1, bbox));
if (renderer.Layout(context).GetStatus() == LayoutResult.FULL && renderer.GetLines().Count == 1)
{
fontSize = curFontSize;
}
else
{
maxFontSize = curFontSize;
}
}
}
catch (InvalidOperationException e) {
LOGGER.Error(PdfOcrLogMessageConstant.PROVIDED_FONT_PROVIDER_IS_INVALID);
throw new OcrException(OcrException.CANNOT_RESOLVE_PROVIDED_FONTS, e);
}
return(fontSize);
}
public static float CalculateHeightForLinesNum(Document doc, Paragraph p, float width, float linesNum, bool
orphans)
{
ParagraphRenderer renderer = (ParagraphRenderer)p.CreateRendererSubTree().SetParent(doc.GetRenderer());
LayoutResult layoutRes = renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, 100000))
));
float lineHeight = layoutRes.GetOccupiedArea().GetBBox().GetHeight() / renderer.GetLines().Count;
float height = lineHeight * linesNum;
if (orphans)
{
return(height);
}
else
{
return(layoutRes.GetOccupiedArea().GetBBox().GetHeight() - height);
}
}
