Java PdfContentByte.moveText方法代碼示例

import com.itextpdf.text.pdf.PdfContentByte; //導入方法依賴的package包/類
/**
 * The <code>addImageToPdf</code> method is used to add image to pdf and make it searchable by adding image text in invisible mode
 * w.r.t parameter 'isPdfSearchable' passed.
 * 
 * @param pdfWriter {@link PdfWriter} writer of pdf in which image has to be added
 * @param htmlUrl {@link HocrPage} corresponding html file for fetching text and coordinates
 * @param imageUrl {@link String} url of image to be added in pdf
 * @param isPdfSearchable true for searchable pdf else otherwise
 * @param widthOfLine
 */
private void addImageToPdf(PdfWriter pdfWriter, HocrPage hocrPage, String imageUrl, boolean isPdfSearchable, final int widthOfLine) {
	if (null != pdfWriter && null != imageUrl && imageUrl.length() > 0) {
		try {
			LOGGER.info("Adding image" + imageUrl + " to pdf using iText");
			Image pageImage = Image.getInstance(imageUrl);
			float dotsPerPointX = pageImage.getDpiX() / PDF_RESOLUTION;
			float dotsPerPointY = pageImage.getDpiY() / PDF_RESOLUTION;
			PdfContentByte pdfContentByte = pdfWriter.getDirectContent();

			pageImage.scaleToFit(pageImage.getWidth() / dotsPerPointX, pageImage.getHeight() / dotsPerPointY);

			pageImage.setAbsolutePosition(0, 0);

			// Add image to pdf
			pdfWriter.getDirectContentUnder().addImage(pageImage);
			pdfWriter.getDirectContentUnder().add(pdfContentByte);

			// If pdf is to be made searchable
			if (isPdfSearchable) {
				LOGGER.info("Adding invisible text for image: " + imageUrl);
				float pageImagePixelHeight = pageImage.getHeight();
				Font defaultFont = FontFactory.getFont(FontFactory.HELVETICA, 8, Font.BOLD, CMYKColor.BLACK);

				// Fetch text and coordinates for image to be added
				Map<String, int[]> textCoordinatesMap = getTextWithCoordinatesMap(hocrPage, widthOfLine);
				Set<String> ketSet = textCoordinatesMap.keySet();

				// Add text at specific location
				for (String key : ketSet) {
					int[] coordinates = textCoordinatesMap.get(key);
					float bboxWidthPt = (coordinates[2] - coordinates[0]) / dotsPerPointX;
					float bboxHeightPt = (coordinates[3] - coordinates[1]) / dotsPerPointY;
					pdfContentByte.beginText();

					// To make text added as invisible
					pdfContentByte.setTextRenderingMode(PdfContentByte.TEXT_RENDER_MODE_INVISIBLE);
					pdfContentByte.setLineWidth(Math.round(bboxWidthPt));

					// Ceil is used so that minimum font of any text is 1
					// For exception of unbalanced beginText() and endText()
					if (bboxHeightPt > 0.0) {
						pdfContentByte.setFontAndSize(defaultFont.getBaseFont(), (float) Math.ceil(bboxHeightPt));
					} else {
						pdfContentByte.setFontAndSize(defaultFont.getBaseFont(), 1);
					}
					float xCoordinate = (float) (coordinates[0] / dotsPerPointX);
					float yCoordinate = (float) ((pageImagePixelHeight - coordinates[3]) / dotsPerPointY);
					pdfContentByte.moveText(xCoordinate, yCoordinate);
					pdfContentByte.showText(key);
					pdfContentByte.endText();
				}
			}
			pdfContentByte.closePath();
		} catch (BadElementException badElementException) {
			LOGGER
					.error("Error occurred while adding image" + imageUrl + " to pdf using Itext: "
							+ badElementException.toString());
		} catch (DocumentException documentException) {
			LOGGER.error("Error occurred while adding image" + imageUrl + " to pdf using Itext: " + documentException.toString());
		} catch (MalformedURLException malformedURLException) {
			LOGGER.error("Error occurred while adding image" + imageUrl + " to pdf using Itext: "
					+ malformedURLException.toString());
		} catch (IOException ioException) {
			LOGGER.error("Error occurred while adding image" + imageUrl + " to pdf using Itext: " + ioException.toString());
		}
	}
}
 

import com.itextpdf.text.pdf.PdfContentByte; //導入方法依賴的package包/類
/**
 * <a href="http://stackoverflow.com/questions/34734669/define-background-color-and-transparency-of-link-annotation-in-pdf">
 * Define background color and transparency of link annotation in PDF
 * </a>
 * <p>
 * This test creates a link annotation with custom appearance. Adobe Reader chooses
 * to ignore it but other viewers use it. Interestingly Adobe Acrobat export-as-image
 * does use the custom appearance...
 * </p>
 */
@Test
public void testCreateLinkWithAppearance() throws IOException, DocumentException
{
    Document doc = new Document();
    PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(new File(RESULT_FOLDER, "custom-link.appearance.pdf")));
    writer.setCompressionLevel(0);
    doc.open();

    BaseFont baseFont = BaseFont.createFont();
    int fontSize = 15;
    doc.add(new Paragraph("Hello", new Font(baseFont, fontSize)));
    
    PdfContentByte content = writer.getDirectContent();
    
    String text = "Test";
    content.setFontAndSize(baseFont, fontSize);
    content.beginText();
    content.moveText(100, 500);
    content.showText(text);
    content.endText();
    
    Rectangle linkLocation = new Rectangle(95, 495 + baseFont.getDescentPoint(text, fontSize),
            105 + baseFont.getWidthPoint(text, fontSize), 505 + baseFont.getAscentPoint(text, fontSize));

    PdfAnnotation linkGreen = PdfAnnotation.createLink(writer, linkLocation, PdfName.HIGHLIGHT, "green" );
    PdfTemplate appearance = PdfTemplate.createTemplate(writer, linkLocation.getWidth(), linkLocation.getHeight());
    PdfGState state = new PdfGState();
    //state.FillOpacity = .3f;
    // IMPROVEMENT: Use blend mode Darken instead of transparency; you may also want to try Multiply.
    state.setBlendMode(new PdfName("Darken"));
    appearance.setGState(state);

    appearance.setColorFill(BaseColor.GREEN);
    appearance.rectangle(0, 0, linkLocation.getWidth(), linkLocation.getHeight());
    appearance.fill();
    linkGreen.setAppearance(PdfName.N, appearance);
    writer.addAnnotation(linkGreen);

    doc.open();
    doc.close();
}