My question is very simple: how can I center a text on a PDF, using PDFBox
?
I don't know the string in advance, I can't find the middle by trial. The string doesn't always have the same width.
I need either:
addCenteredString(myString)
Any help is welcome!
Ok, I found the answer myself. Here is how to center some text on a page:
String title = "This is my wonderful title!"; // Or whatever title you want.
int marginTop = 30; // Or whatever margin you want.
PDDocument document = new PDDocument();
PDPage page = new PDPage()
PDPageStreamContent stream = new PDPageContentStream(document, page);
PDFont font = PDType1Font.HELVETICA_BOLD; // Or whatever font you want.
int fontSize = 16; // Or whatever font size you want.
float titleWidth = font.getStringWidth(title) / 1000 * fontSize;
float titleHeight = font.getFontDescriptor().getFontBoundingBox().getHeight() / 1000 * fontSize;
stream.beginText();
stream.setFont(font, fontSize);
// Deprecated, only before 2.0:
// stream.moveTextPositionByAmount((page.getMediaBox().getWidth() - titleWidth) / 2, page.getMediaBox().getHeight() - marginTop - titleheight);
// From 2.0 and beyond:
stream.newLineAtOffset((page.getMediaBox().getWidth() - titleWidth) / 2, page.getMediaBox().getHeight() - marginTop - titleheight);
stream.drawString(title);
stream.endText();
stream.close();