Develop Reference

How to add a text above a previous added image and center it above this image with pdfbox?

My aim is to add a image to a pdf and write a text above this image. I have centered the image and the text should be center above the image with a little margin to the image.
Currently the image will be added and centered but the text is not centered.
Here my current code. The interesting part is where the method drawTitleAtTop will be called. Here i have added the height of the newly added image to the y postion plus a margin of 3. The x coordinate I calculate depending on the incoming text but there is some miscalculation. Any advice?
private static void addScaledImage(ImageData imgData, PDDocument pdDocument, Dimension thePdfDimension) {
ImageHelper helper = Scalr::resize;
byte[] scaledImage = ImageUtils.resizeImageKeepAspectRatio(helper, imgData.getImageBinary(), thePdfDimension.width);
PDRectangle rectangle = pdDocument.getPage(0).getMediaBox();
PDPage page = new PDPage(rectangle);
pdDocument.addPage(page);
PDImageXObject pdImage = null;
try {
pdImage = PDImageXObject.createFromByteArray(pdDocument, scaledImage, null);
LOG.debug("size of scaled image is x: {0} y {1}", pdImage.getWidth(), pdImage.getHeight());
int xForImage = (thePdfDimension.width - pdImage.getWidth()) / 2 ;
int yForImage = (thePdfDimension.height - pdImage.getHeight()) / 2;
LOG.debug("new x {0} new y {1}", xForImage, yForImage);
try (PDPageContentStream contentStream = new PDPageContentStream(pdDocument, page, AppendMode.APPEND, true, true)) {
if (StringUtils.isNotBlank(imgData.getTitle())) {
yForImage = xForImage - 20;
contentStream.drawImage(pdImage, xForImage, yForImage, pdImage.getWidth(), pdImage.getHeight());
drawTitelAtTop(imgData, page, xForImage , yForImage + pdImage.getHeight() + 3, contentStream);
} else {
contentStream.drawImage(pdImage, xForImage, yForImage, pdImage.getWidth(), pdImage.getHeight());
}
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private static void drawTitelAtTop(ImageData imgData, PDPage page, int x, int y, PDPageContentStream contentStream) throws IOException {
PDFont font = PDType1Font.COURIER;
int fontSize = FONT_SIZE_FOR_TITLE;
float titleWidth = font.getStringWidth(imgData.getTitle()) / 1000 * fontSize;
LOG.debug("title width is " + titleWidth);
contentStream.setFont(font, fontSize);
contentStream.beginText();
float tx = ((x - titleWidth) / 2) + x;
//float tx = x;
//float ty = page.getMediaBox().getHeight() - marginTop + (marginTop / 4);
float ty = y;
LOG.debug("title offset x {0} y {1}", tx, ty);
contentStream.newLineAtOffset(tx,
ty);
contentStream.showText(imgData.getTitle());
contentStream.endText();
}

Itext7 - vertical aligment PdfFormField

Is there a way to edit vertica aligment of the text written in a PdfFormField.
The default seems to be center, I need a bottom.
With normal setValue the text is written at the center. I tried with rectangle/canvas but did not work (here the code)
PdfPage page = form.getField(key).getWidgets().get(0).getPage();
PdfCanvas pdfCanvas = new PdfCanvas(page);
PdfArray position = formFields.get(key).getWidgets().get(0).getRectangle();
double x = position.getAsNumber(0).getValue();
double y = position.getAsNumber(1).getValue();
double xWidth = position.getAsNumber(2).getValue();
double yWidth = position.getAsNumber(3).getValue();
Rectangle rectangle = new Rectangle((float) x, (float) y, (float) xWidth, (float) yWidth);
Canvas canvas = new Canvas(pdfCanvas, pdfDoc, rectangle);
Paragraph paragraph = new Paragraph(valore);
paragraph.setFont(font);
paragraph.setVerticalAlignment(VerticalAlignment.BOTTOM);
canvas.add(paragraph);

Rotating PDFContentByte Overlay Content

I have created a watermark text that is vertically centered.
This is the line I used
PdfPatternPainter.showTextAlignedKerned(Element.ALIGN_MIDDLE,
string, x, y, -90);
What i want to do now is to make the watermark diagonal. changing the angle value will make it diagonal, but then its x,y position is not centered anymore.
this is my current method
public static void createWaterMarkPDF(ArrayList<String> watermark, PdfReader reader, PdfStamper stamper) throws Exception {
Rectangle pageSize = reader.getPageSize(1);
final float WATERMARK_PAGE_ANGLE = 270;
BaseFont font = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED);
PdfPatternPainter painter = stamper.getOverContent(1).createPattern(pageSize.getWidth(), pageSize.getHeight());
painter.setColorStroke(new BaseColor(192, 192, 192));
int FONT_SIZE = 80;
painter.beginText();
painter.setTextRenderingMode(PdfPatternPainter.TEXT_RENDER_MODE_FILL);
painter.setFontAndSize(font, FONT_SIZE);
for (int i=0; i<watermark.size(); i++) {
String string = watermark.get(i);
// Values are opposite since we are doing a vertical alignment angle
float width = font.getAscentPoint(string, FONT_SIZE) + font.getDescentPoint(string, FONT_SIZE);
float height = painter.getEffectiveStringWidth(string, true);
float x = (pageSize.getWidth() - width) / 2;
if (i == 0)
x += (width * 3);
else if (i == 2)
x -= (width * 3);
painter.showTextAlignedKerned(Element.ALIGN_MIDDLE,
string, x,
Util.transformY(pageSize, (pageSize.getHeight() - height) / 2),
WATERMARK_PAGE_ANGLE);
}
painter.endText();
// Transparency of watermark
PdfGState state = new PdfGState();
state.setFillOpacity(0.1f);
for (int i=reader.getNumberOfPages(); i>0; i--) {
Rectangle thisPageSize = reader.getPageSize(i);
PdfContentByte overContent = stamper.getOverContent(i);
overContent.setColorFill(new PatternColor(painter));
overContent.setGState(state);
overContent.rectangle(thisPageSize.getLeft(), thisPageSize.getBottom(), thisPageSize.getWidth(), thisPageSize.getHeight());
overContent.fill();
}
}
it draws vertical lines and centered. watermark is an ArrayList. you can add 3 strings.
if i change the angle to , say 300 (or -60) to make it diagonal, the positioning is whacked. do i need to use an AffineTransform here? although i already tried, didnt work for me unless i lacked something here?

How do you track the location of PDPageContentStream's text output?

I am using Java to write output to a PDDocument, then appending that document to an existing one before serving it to the client.
Most of it is working well. I only have a small problem trying to handle content overflow while writing to that PDDocument.
I want to keep track of where text is being inserted into the document so that when the "cursor" so to speak goes past a certain point, I'll create a new page, add it to the document, create a new content stream, and continue as normal.
Here is some code that shows what I'd like to do:
// big try block
PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage(page);
PDPageContentStream content = new PDPageContentStream(doc, page);
int fontSize = 12;
content.beginText();
content.setFont(...);
content.moveTextPositionByAmount(margin, pageHeight-margin);
for ( each element in a collection of values ) {
content.moveTextPositionByAmount(0, -fontSize); // only moves down in document
// at this point, check if past the end of page, if so add a new page
if (content.getTextYPosition(...) < margin) { // wishful thinking, doesn't exist
content.endText();
content.close();
page = new PDPage();
doc.addPage(page);
content = new PDPageContentStream(doc, page);
content.beginText();
content.setFont(...);
content.moveTextPositionByAmount(margin, pageHeight-(margin+fontSize));
}
content.drawString(...);
}
content.endText();
content.close();
The important bit is the content.getTextYPosition(). It doesn't actually exist, but I'm sure PDPageContentStream must be keeping track of a similar value. Is there any way to access this value?
Thanks.

Create a heightCounter variable that tracks how far you've moved the text location. It's initial value can be your starting Y position.
PDRectangle mediabox = page.findMediaBox();
float margin = 72;
float width = mediabox.getWidth() - 2 * margin;
float startX = mediabox.getLowerLeftX() + margin;
float startY = mediabox.getUpperRightY() - margin;
float heightCounter = startY;
Every time you move the text position, subtract that from your heightCounter. When heightCounter is less than what you're moving the text position by, then create a new page.

contentStream.beginText();
contentStream.setFont(pdfFont, fontSize);
contentStream.moveTextPositionByAmount(startX, startY);
for (String line : lines) {
if(height>705){ //this is the height of my bottom line where I want cutoff. you can check yours by sysoout the content.
line = line.trim();
float charSpacing = 0;
if (line.length() > 1) {
float size = fontSize * pdfFont.getStringWidth(line) / 1000;
float free = width - size;
if (free > 0) {
charSpacing = free / (line.length() - 1);
}
}
contentStream.drawString(line);
contentStream.moveTextPositionByAmount(0, -leading);
System.out.println("content Stream line :" + line);
height--;
System.out.println("value of height:"+ height);
}
else{
contentStream.endText();
contentStream.close();
page = new PDPage(PDPage.PAGE_SIZE_A4);
doc.addPage(page);
contentStream = new PDPageContentStream(doc, page,false, true, true);
contentStream.beginText();
contentStream.setFont(pdfFont, fontSize);
contentStream.moveTextPositionByAmount(startX, startY);
System.out.println("Height counter value :"+ height);
System.out.println("line insde the second page:" + line);
contentStream.drawString(line);
System.out.println("Output on second page:"+contentStream.toString());
contentStream.moveTextPositionByAmount(0, -leading);
height=mediabox.getHeight() - 2 * margin; //
}
}
contentStream.endText();
contentStream.close();
}

this is my configuration on the top for your reference how I am using.
happy coding ..
PDPageContentStream contentStream = new PDPageContentStream(doc, page,true, true, true);
//PDPage page1 = new PDPage(PDPage.PAGE_SIZE_A4);
PDPageContentStream contentStream1 = new PDPageContentStream(doc, page,true, true, true);
PDFont pdfFont = PDType1Font.COURIER;
PDFont fontBold = PDType1Font.TIMES_BOLD;
float leading = 1.5f * fontSize;
PDRectangle mediabox = page.getMediaBox();
float margin = 45;
float width = mediabox.getWidth() - 2 * margin;
float height = mediabox.getHeight() - 2 * margin;
float startX = mediabox.getLowerLeftX() + margin - statVarX;
float startY = mediabox.getUpperRightY() - margin - statVarY;

Adding page numbers using PDFBox

How can I add page number to a page in a document generated using PDFBox?
Can anybody tell me how to add page numbers to a document after I merge different PDFs? I am using the PDFBox library in Java.
This is my code and it works well but I need to add page number.
PDFMergerUtility ut = new PDFMergerUtility();
ut.addSource("c:\\pdf1.pdf");
ut.addSource("c:\\pdf2.pdf");
ut.addSource("c:\\pdf3.pdf");
ut.mergeDocuments();

You may want to look at the PDFBox sample AddMessageToEachPage.java. The central code is:
try (PDDocument doc = PDDocument.load(new File(file)))
{
PDFont font = PDType1Font.HELVETICA_BOLD;
float fontSize = 36.0f;
for( PDPage page : doc.getPages() )
{
PDRectangle pageSize = page.getMediaBox();
float stringWidth = font.getStringWidth( message )*fontSize/1000f;
// calculate to center of the page
int rotation = page.getRotation();
boolean rotate = rotation == 90 || rotation == 270;
float pageWidth = rotate ? pageSize.getHeight() : pageSize.getWidth();
float pageHeight = rotate ? pageSize.getWidth() : pageSize.getHeight();
float centerX = rotate ? pageHeight/2f : (pageWidth - stringWidth)/2f;
float centerY = rotate ? (pageWidth - stringWidth)/2f : pageHeight/2f;
// append the content to the existing stream
try (PDPageContentStream contentStream = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true))
{
contentStream.beginText();
// set font and font size
contentStream.setFont( font, fontSize );
// set text color to red
contentStream.setNonStrokingColor(255, 0, 0);
if (rotate)
{
// rotate the text according to the page rotation
contentStream.setTextMatrix(Matrix.getRotateInstance(Math.PI / 2, centerX, centerY));
}
else
{
contentStream.setTextMatrix(Matrix.getTranslateInstance(centerX, centerY));
}
contentStream.showText(message);
contentStream.endText();
}
}
doc.save( outfile );
}
The 1.8.x pendant was:
PDDocument doc = null;
try
{
doc = PDDocument.load( file );
List allPages = doc.getDocumentCatalog().getAllPages();
PDFont font = PDType1Font.HELVETICA_BOLD;
float fontSize = 36.0f;
for( int i=0; i<allPages.size(); i++ )
{
PDPage page = (PDPage)allPages.get( i );
PDRectangle pageSize = page.findMediaBox();
float stringWidth = font.getStringWidth( message )*fontSize/1000f;
// calculate to center of the page
int rotation = page.findRotation();
boolean rotate = rotation == 90 || rotation == 270;
float pageWidth = rotate ? pageSize.getHeight() : pageSize.getWidth();
float pageHeight = rotate ? pageSize.getWidth() : pageSize.getHeight();
double centeredXPosition = rotate ? pageHeight/2f : (pageWidth - stringWidth)/2f;
double centeredYPosition = rotate ? (pageWidth - stringWidth)/2f : pageHeight/2f;
// append the content to the existing stream
PDPageContentStream contentStream = new PDPageContentStream(doc, page, true, true,true);
contentStream.beginText();
// set font and font size
contentStream.setFont( font, fontSize );
// set text color to red
contentStream.setNonStrokingColor(255, 0, 0);
if (rotate)
{
// rotate the text according to the page rotation
contentStream.setTextRotation(Math.PI/2, centeredXPosition, centeredYPosition);
}
else
{
contentStream.setTextTranslation(centeredXPosition, centeredYPosition);
}
contentStream.drawString( message );
contentStream.endText();
contentStream.close();
}
doc.save( outfile );
}
finally
{
if( doc != null )
{
doc.close();
}
}
Instead of the message, you can add page numbers. And instead of the center, you can use any position.
(The example can be improved, though: the MediaBox is the wrong choice, the CropBox should be used, and the page rotation handling only appears to properly handle 0° and 90°; 180° and 270° create upside-down writing.)

It is easy, try the following code
public static void addPageNumbers(PDDocument document, String numberingFormat, int offset_X, int offset_Y) throws IOException {
int page_counter = 1;
for(PDPage page : document.getPages()){
PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true, false);
contentStream.beginText();
contentStream.setFont(PDType1Font.TIMES_ITALIC, 10);
PDRectangle pageSize = page.getMediaBox();
float x = pageSize.getLowerLeftX();
float y = pageSize.getLowerLeftY();
contentStream.newLineAtOffset(x+ pageSize.getWidth()-offset_X, y+offset_Y);
String text = MessageFormat.format(numberingFormat,page_counter);
contentStream.showText(text);
contentStream.endText();
contentStream.close();
++page_counter;
}
}
public static void main(String[] args) throws Exception {
File file = new File("your input pdf path");
PDDocument document = PDDocument.load(file);
addPageNumbers(document,"Page {0}",60,18);
document.save(new File("output pdf path"));
document.close();
}