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);
}
private static void AddSection(PdfDocument pdfDoc, Paragraph paragraph, int pageNumber, int sectionNumber)
{
Document doc = new Document(pdfDoc);
ParagraphRenderer renderer = (ParagraphRenderer)paragraph.CreateRendererSubTree();
renderer.SetParent(new DocumentRenderer(doc));
float pageHeight = pdfDoc.GetDefaultPageSize().GetHeight();
float pageWidth = pdfDoc.GetDefaultPageSize().GetWidth();
Rectangle textSectionRectangle = new Rectangle(
doc.GetLeftMargin(),
doc.GetBottomMargin() + ((pageHeight - doc.GetTopMargin() - doc.GetBottomMargin()) / 3) * sectionNumber,
pageWidth - doc.GetLeftMargin() - doc.GetRightMargin(),
(pageHeight - doc.GetTopMargin() - doc.GetBottomMargin()) / 3);
// Simulate the positioning of the renderer to find out how much space the text section will occupy.
LayoutResult layoutResult = renderer
.Layout(new LayoutContext(new LayoutArea(pageNumber, textSectionRectangle)));
/* Fill the current page section with the content.
* If the content isn't fully placed in the current page section,
* it will be split and drawn in the next page section.
*/
while (layoutResult.GetStatus() != LayoutResult.FULL)
{
if (pdfDoc.GetNumberOfPages() < pageNumber)
{
pdfDoc.AddNewPage();
}
pageNumber++;
layoutResult.GetSplitRenderer().Draw(new DrawContext(pdfDoc,
new PdfCanvas(pdfDoc.GetPage(pageNumber - 1)), false));
renderer = (ParagraphRenderer)layoutResult.GetOverflowRenderer();
layoutResult = renderer
.Layout(new LayoutContext(new LayoutArea(pageNumber, textSectionRectangle)));
}
if (pdfDoc.GetNumberOfPages() < pageNumber)
{
pdfDoc.AddNewPage();
}
renderer.Draw(new DrawContext(pdfDoc, new PdfCanvas(pdfDoc.GetPage(pageNumber)), false));
}
/// <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);
}
protected void ManipulatePdf(string dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
Document doc = new Document(pdfDoc);
PdfCanvas canvas = new PdfCanvas(pdfDoc.GetFirstPage());
Paragraph p = new Paragraph("This is a long paragraph that doesn't"
+ "fit the width we defined for the simple column of the"
+ "ColumnText object, so it will be distributed over several"
+ "lines (and we don't know in advance how many).");
Rectangle firstRect = new Rectangle(120, 500, 130, 280);
new Canvas(canvas, firstRect)
.Add(p);
canvas.Rectangle(firstRect);
canvas.Stroke();
// In the lines below the comment we try to reproduce the iText5 method to achieve the result
// However it's much more simple to use the next line
// p.SetBorder(new SolidBorder(1));
// Or you can implement your own ParagraphRenderer and change the behaviour of drawBorder(DrawContext)
// or draw(DrawContext)
Rectangle secRect = new Rectangle(300, 500, 130, 280);
ParagraphRenderer renderer = (ParagraphRenderer)p.CreateRendererSubTree().SetParent(doc.GetRenderer());
float height = renderer.Layout(new LayoutContext(new LayoutArea(0, secRect)))
.GetOccupiedArea().GetBBox().GetHeight();
new Canvas(canvas, secRect)
.Add(p);
canvas.Rectangle(secRect.GetX(), secRect.GetY() + secRect.GetHeight() - height, secRect.GetWidth(), height);
canvas.Stroke();
doc.Close();
}
public static void ProduceOrphansAndWidowsTestCase(String outPdf, Paragraph testPara)
{
Document doc = new Document(new PdfDocument(new PdfWriter(outPdf)));
PageSize pageSize = new PageSize(PageSize.A4.GetWidth(), PageSize.A5.GetHeight());
doc.GetPdfDocument().SetDefaultPageSize(pageSize);
Rectangle[] columns = InitUniformColumns(pageSize, 2);
doc.SetRenderer(new ColumnDocumentRenderer(doc, columns));
String paraText = "A one line string\n";
testPara.SetMargin(0).SetBackgroundColor(new DeviceRgb(232, 232, 232));
testPara.Add(paraText);
float linesHeight = CalculateHeightForLinesNum(doc, testPara, columns[1].GetWidth(), 1, true);
float adjustmentHeight = columns[0].GetHeight() - linesHeight - LINES_SPACE_EPS;
String description = "Test orphans and widows case at once. This block height" + " is adjusted in such way that both orphans and widows cases occur.\n "
+ "The following paragraph contains as many fitting in one line text strings as needed" + " to reproduce the case with both orphans and widows\n"
+ "Reference example without orphans and widows" + " control can be found on the next page";
doc.Add(new Paragraph(description).SetMargin(0).SetBorder(new SolidBorder(1)).SetHeight(adjustmentHeight));
Paragraph tempPara = new Paragraph().SetMargin(0);
for (int i = 0; i < 50; i++)
{
tempPara.Add(paraText);
}
ParagraphRenderer renderer = (ParagraphRenderer)tempPara.CreateRendererSubTree().SetParent(doc.GetRenderer
());
LayoutResult layoutRes = renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(columns[1].GetWidth
(), columns[1].GetHeight()))));
int numberOfLines = ((ParagraphRenderer)layoutRes.GetSplitRenderer()).GetLines().Count;
for (int i = 0; i <= numberOfLines; i++)
{
testPara.Add(paraText);
}
doc.Add(testPara);
doc.Add(new AreaBreak(AreaBreakType.NEXT_PAGE));
doc.Add(new Paragraph("Reference example without orphans and widows control.").SetMargin(0).SetBorder(new
SolidBorder(1)).SetHeight(adjustmentHeight));
Paragraph paragraph = new Paragraph();
for (int i = 0; i <= numberOfLines + 1; i++)
{
paragraph.Add(paraText);
}
paragraph.SetMargin(0).SetBackgroundColor(new DeviceRgb(232, 232, 232));
doc.Add(paragraph);
doc.Add(new Paragraph(paraText).SetMargin(0).SetBackgroundColor(new DeviceRgb(232, 232, 232)));
doc.Close();
}
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);
}
}