in tools/src/main/java/org/apache/pdfbox/tools/TextToPDF.java [250:407]
public void createPDFFromText( PDDocument doc, Reader text ) throws IOException
{
// for some reason the font isn't initialized -> use default font
if (font == null)
{
font = new PDType1Font(standardFont);
}
float fontHeight = font.getBoundingBox().getHeight() / FONTSCALE;
PDRectangle actualMediaBox =
landscape ? new PDRectangle(mediaBox.getHeight(), mediaBox.getWidth()) : mediaBox;
// calculate line height and increase by a factor.
float lineHeight = fontHeight * fontSize * lineSpacing;
BufferedReader data = new BufferedReader(text);
String nextLine;
PDPage page = new PDPage(actualMediaBox);
PDPageContentStream contentStream = null;
float y = -1;
float maxStringLength = page.getMediaBox().getWidth() - leftMargin - rightMargin;
// There is a special case of creating a PDF document from an empty string.
boolean textIsEmpty = true;
StringBuilder nextLineToDraw = new StringBuilder();
while ((nextLine = data.readLine()) != null)
{
// The input text is nonEmpty. New pages will be created and added
// to the PDF document as they are needed, depending on the length of
// the text.
textIsEmpty = false;
String[] lineWords = nextLine.replaceAll("[\\n\\r]+$", "").split(" ", -1);
int lineIndex = 0;
while (lineIndex < lineWords.length)
{
nextLineToDraw.setLength(0);
boolean addSpace = false;
float lengthIfUsingNextWord = 0;
boolean ff = false;
do
{
String word1, word2 = "";
String word = lineWords[lineIndex];
int indexFF = word.indexOf('\f');
if (indexFF == -1)
{
word1 = word;
}
else
{
ff = true;
word1 = word.substring(0, indexFF);
if (indexFF < word.length())
{
word2 = word.substring(indexFF + 1);
}
}
// word1 is the part before ff, word2 after
// both can be empty
// word1 can also be empty without ff, if a line has many spaces
if (!word1.isEmpty() || !ff)
{
if (addSpace)
{
nextLineToDraw.append(' ');
}
else
{
addSpace = true;
}
nextLineToDraw.append(word1);
}
if (!ff || word2.isEmpty())
{
lineIndex++;
}
else
{
lineWords[lineIndex] = word2;
}
if (ff)
{
break;
}
if (lineIndex < lineWords.length)
{
// need cut off at \f in next word to avoid IllegalArgumentException
String nextWord = lineWords[lineIndex];
indexFF = nextWord.indexOf('\f');
if (indexFF != -1)
{
nextWord = nextWord.substring(0, indexFF);
}
String lineWithNextWord = nextLineToDraw + " " + nextWord;
lengthIfUsingNextWord
= (font.getStringWidth(lineWithNextWord) / FONTSCALE) * fontSize;
}
}
while (lineIndex < lineWords.length && lengthIfUsingNextWord < maxStringLength);
if (y - lineHeight < bottomMargin)
{
// We have crossed the end-of-page boundary and need to extend the
// document by another page.
page = new PDPage(actualMediaBox);
doc.addPage(page);
if (contentStream != null)
{
contentStream.endText();
contentStream.close();
}
contentStream = new PDPageContentStream(doc, page);
contentStream.setFont(font, fontSize);
contentStream.beginText();
y = page.getMediaBox().getHeight() - topMargin;
y += lineHeight - fontHeight * fontSize; // adjust for lineSpacing != 1
contentStream.newLineAtOffset(leftMargin, y);
}
if (contentStream == null)
{
throw new IOException("Error:Expected non-null content stream.");
}
contentStream.newLineAtOffset(0, -lineHeight);
y -= lineHeight;
contentStream.showText(nextLineToDraw.toString());
if (ff)
{
page = new PDPage(actualMediaBox);
doc.addPage(page);
contentStream.endText();
contentStream.close();
contentStream = new PDPageContentStream(doc, page);
contentStream.setFont(font, fontSize);
contentStream.beginText();
y = page.getMediaBox().getHeight() - topMargin;
y += lineHeight - fontHeight * fontSize; // adjust for lineSpacing != 1
contentStream.newLineAtOffset(leftMargin, y);
}
}
}
// If the input text was the empty string, then the above while loop will have short-circuited
// and we will not have added any PDPages to the document.
// So in order to make the resultant PDF document readable by Adobe Reader etc, we'll add an empty page.
if (textIsEmpty)
{
doc.addPage(page);
}
if (contentStream != null)
{
contentStream.endText();
contentStream.close();
}
}