Java Code Examples for com.itextpdf.text.pdf.PdfContentByte#saveState()

void split(PdfReader reader, int page) throws IOException {
    PdfImportedPage importedPage = writer.getImportedPage(reader, page);

    Rectangle pageSizeToImport = reader.getPageSize(page);
    Iterable<Rectangle> rectangles = determineSplitRectangles(reader, page);

    for (Rectangle rectangle : rectangles) {
        newPage(rectangle);
        PdfContentByte directContent = writer.getDirectContent();
        directContent.saveState();
        directContent.rectangle(rectangle.getLeft(), rectangle.getBottom(), rectangle.getWidth(), rectangle.getHeight());
        directContent.clip();
        directContent.newPath();

        writer.getDirectContent().addTemplate(importedPage, -pageSizeToImport.getLeft(), -pageSizeToImport.getBottom());

        directContent.restoreState();
    }
}
 

@Override
    public void cellLayout(PdfPCell cell, Rectangle position, PdfContentByte[] canvases) {
        PdfContentByte canvas = canvases[PdfPTable.BACKGROUNDCANVAS];

        float xTransition = position.getLeft() + (position.getRight() - position.getLeft()) * (percent/100.0f);
        float yTransition = (position.getTop() + position.getBottom()) / 2f;
        float radius = (position.getRight() - position.getLeft()) * 0.025f;
        PdfShading axial = PdfShading.simpleAxial(canvas.getPdfWriter(),
                xTransition - radius, yTransition, xTransition + radius, yTransition, leftColor, rightColor);
        PdfShadingPattern shading = new PdfShadingPattern(axial);

        canvas.saveState();
        canvas.setShadingFill(shading);
        canvas.rectangle(position.getLeft(), position.getBottom(), position.getWidth(), position.getHeight());
//        canvas.clip();
        canvas.fill();
        canvas.restoreState();
    }
 

void split(PdfReader reader, int page) throws IOException {
    PdfImportedPage importedPage = writer.getImportedPage(reader, page);
    PdfContentByte directContent = writer.getDirectContent();
    yPosition = pageSize.getTop();

    Rectangle pageSizeToImport = reader.getPageSize(page);
    float[] borderPositions = determineSplitPositions(reader, page);
    if (borderPositions == null || borderPositions.length < 2)
        return;

    for (int borderIndex = 0; borderIndex + 1 < borderPositions.length; borderIndex++) {
        float height = borderPositions[borderIndex] - borderPositions[borderIndex + 1];
        if (height <= 0)
            continue;

        directContent.saveState();
        directContent.rectangle(0, yPosition - height, pageSizeToImport.getWidth(), height);
        directContent.clip();
        directContent.newPath();

        writer.getDirectContent().addTemplate(importedPage, 0, yPosition - (borderPositions[borderIndex] - pageSizeToImport.getBottom()));

        directContent.restoreState();
        newPage();
    }
}
 

/**
 * <a href="https://stackoverflow.com/questions/50121297/missing-colored-area-on-pdf-using-itext-pdf">
 * Missing colored area on pdf using itext pdf
 * </a>
 * <p>
 * This test shows how to mark a whole table row without the
 * marking hiding the existing content or vice versa.
 * </p>
 */
@Test
public void test() throws IOException, DocumentException {
    try (   InputStream resource = getClass().getResourceAsStream("document.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "document-marked.pdf"))) {
        PdfReader pdfReader = new PdfReader(resource);
        PdfStamper stamper = new PdfStamper(pdfReader, result);

        PdfContentByte canvas = stamper.getOverContent(1);
        canvas.saveState();
        PdfGState state = new PdfGState();
        state.setBlendMode(new PdfName("Multiply"));
        canvas.setGState(state);
        canvas.setColorFill(BaseColor.YELLOW);
        canvas.rectangle(60, 586, 477, 24);
        canvas.fill();
        canvas.restoreState();

        stamper.close();
    }
}
 

@Override
public void onEndPage(PdfWriter writer, Document document) {
    if (active) {
        PdfContentByte cb = writer.getDirectContentUnder();
        cb.saveState();
        cb.setColorFill(color);
        cb.rectangle(document.left(), document.bottom() - offset,
                document.right() - document.left(), startPosition - document.bottom());
        cb.fill();
        cb.restoreState();
    }
}
 

@Override
public void onParagraphEnd(PdfWriter writer, Document document, float paragraphPosition) {
    if (active) {
        PdfContentByte cb = writer.getDirectContentUnder();
        cb.saveState();
        cb.setColorFill(color);
        cb.rectangle(document.left(), paragraphPosition - offset,
                document.right() - document.left(), startPosition - paragraphPosition);
        cb.fill();
        cb.restoreState();
    }
}
 

private static void addBackground(PdfWriter writer)
        throws BadElementException, MalformedURLException, IOException, DocumentException {
    PdfContentByte canvas = writer.getDirectContentUnder();
    canvas.saveState();
    canvas.addImage(bkgnd);
    canvas.restoreState();
}
 

@Test
public void testSimple() throws FileNotFoundException, DocumentException
{
    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(new File(RESULT_FOLDER, "transparency.pdf")));
    writer.setCompressionLevel(0);
    document.open();
    PdfContentByte content = writer.getDirectContent();

    content.setRGBColorStroke(0, 255, 0);
    for (int y = 0; y <= 400; y+= 10)
    {
        content.moveTo(0, y);
        content.lineTo(500, y);
    }
    for (int x = 0; x <= 500; x+= 10)
    {
        content.moveTo(x, 0);
        content.lineTo(x, 400);
    }
    content.stroke();

    
    content.saveState();
    PdfGState state = new PdfGState();
    state.setFillOpacity(0.5f);
    content.setGState(state);
    content.setRGBColorFill(255, 0, 0);
    content.moveTo(162, 86);
    content.lineTo(162, 286);
    content.lineTo(362, 286);
    content.lineTo(362, 86);
    content.closePath();
    //content.fillStroke();
    content.fill();
    
    content.restoreState();

    document.close();
}
 

/**
 * pdf 用文字加水印，存在问题，如何支持中文
 * @author eko.zhan at 2018年9月2日 下午1:44:40
 * @throws FileNotFoundException
 * @throws IOException
 * @throws DocumentException
 */
@Test
public void testVisioAsPdfWithText() throws FileNotFoundException, IOException, DocumentException{
	File inputFile = new File("E:/ConvertTester/TestFiles/I_am_a_vsdx.vsdx");
	File outputFile = new File("E:/ConvertTester/TestFiles/I_am_a_vsdx_libreoffice.pdf");
	if (!outputFile.exists()) {
		convert(inputFile, outputFile);
	}
	File destFile = new File("E:/ConvertTester/TestFiles/I_am_a_vsdx_libreoffice_watermark.pdf");
	//转换成 pdf 后利用 itext 加水印 
	PdfReader reader = new PdfReader(new FileInputStream(outputFile));
	PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(destFile));
	int pageNo = reader.getNumberOfPages();
	Font f = new Font(FontFamily.HELVETICA, 28);
	Phrase p = new Phrase("Xiaoi Robot", f);
	for (int i=1;i<=pageNo;i++) {
		PdfContentByte over = stamper.getOverContent(i);
		over.saveState();
		PdfGState gs1 = new PdfGState();
		gs1.setFillOpacity(0.5f);
		over.setGState(gs1);
		ColumnText.showTextAligned(over, Element.ALIGN_CENTER, p, 297, 450, 0);
		over.restoreState();
	}
	stamper.close();
	reader.close();
}
 

private PdfContentByte bulidCellBorder(PdfContentByte[] canvases,Border border){
	PdfContentByte cb=canvases[PdfPTable.LINECANVAS];
	cb.saveState();
	BigDecimal w=new BigDecimal(border.getWidth());
	cb.setLineWidth(w.divide(new BigDecimal(2),10,RoundingMode.HALF_UP).floatValue());
	if(border.getStyle().equals(BorderStyle.dashed)){
		cb.setLineDash(new float[]{2f,3f,1f},2);
	}
	String borderColor[]=border.getColor().split(",");
	cb.setColorStroke(new BaseColor(Integer.valueOf(borderColor[0]),Integer.valueOf(borderColor[1]),Integer.valueOf(borderColor[2])));
	return cb;
}
 

void merge(PdfReader reader, PdfReaderContentParser parser, int page) throws IOException
{
    PdfImportedPage importedPage = writer.getImportedPage(reader, page);
    PdfContentByte directContent = writer.getDirectContent();
    
    PageVerticalAnalyzer finder = parser.processContent(page, new PageVerticalAnalyzer());
    if (finder.verticalFlips.size() < 2)
        return;
    Rectangle pageSizeToImport = reader.getPageSize(page);

    int startFlip = finder.verticalFlips.size() - 1;
    boolean first = true;
    while (startFlip > 0)
    {
        if (!first)
            newPage();

        float freeSpace = yPosition - pageSize.getBottom(bottomMargin);
        int endFlip = startFlip + 1;
        while ((endFlip > 1) && (finder.verticalFlips.get(startFlip) - finder.verticalFlips.get(endFlip - 2) < freeSpace))
            endFlip -=2;
        if (endFlip < startFlip)
        {
            float height = finder.verticalFlips.get(startFlip) - finder.verticalFlips.get(endFlip);

            directContent.saveState();
            directContent.rectangle(0, yPosition - height, pageSizeToImport.getWidth(), height);
            directContent.clip();
            directContent.newPath();

            writer.getDirectContent().addTemplate(importedPage, 0, yPosition - (finder.verticalFlips.get(startFlip) - pageSizeToImport.getBottom()));

            directContent.restoreState();
            yPosition -= height + gap;
            startFlip = endFlip - 1;
        }
        else if (!first) 
            throw new IllegalArgumentException(String.format("Page %s content sections too large.", page));
        first = false;
    }
}
 

@Test
public void testComplex() throws FileNotFoundException, DocumentException
{
    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(new File(RESULT_FOLDER, "transparencyComplex.pdf")));
    writer.setCompressionLevel(0);
    document.open();
    PdfContentByte content = writer.getDirectContent();

    content.setRGBColorStroke(0, 255, 0);
    for (int y = 0; y <= 400; y+= 10)
    {
        content.moveTo(0, y);
        content.lineTo(500, y);
    }
    for (int x = 0; x <= 500; x+= 10)
    {
        content.moveTo(x, 0);
        content.lineTo(x, 400);
    }
    content.stroke();

    PdfTemplate template = content.createTemplate(500, 400);
    PdfTransparencyGroup group = new PdfTransparencyGroup();
    group.put(PdfName.CS, PdfName.DEVICEGRAY);
    group.setIsolated(false);
    group.setKnockout(false);
    template.setGroup(group);
    PdfShading radial = PdfShading.simpleRadial(writer, 262, 186, 10, 262, 186, 190, BaseColor.WHITE, BaseColor.BLACK, true, true);
    template.paintShading(radial);

    PdfDictionary mask = new PdfDictionary();
    mask.put(PdfName.TYPE, PdfName.MASK);
    mask.put(PdfName.S, new PdfName("Luminosity"));
    mask.put(new PdfName("G"), template.getIndirectReference());

    content.saveState();
    PdfGState state = new PdfGState();
    state.put(PdfName.SMASK, mask);
    content.setGState(state);
    content.setRGBColorFill(255, 0, 0);
    content.moveTo(162, 86);
    content.lineTo(162, 286);
    content.lineTo(362, 286);
    content.lineTo(362, 86);
    content.closePath();
    //content.fillStroke();
    content.fill();
    
    content.restoreState();

    document.close();
}
 

/**
 * pdf 用图片加水印
 * @author eko.zhan at 2018年9月2日 下午1:44:58
 * @throws FileNotFoundException
 * @throws IOException
 * @throws DocumentException
 */
@Test
public void testVisioAsPdfWithImg() throws FileNotFoundException, IOException, DocumentException{
	File inputFile = new File("E:/ConvertTester/TestFiles/I_am_a_vsdx.vsdx");
	File outputFile = new File("E:/ConvertTester/TestFiles/I_am_a_vsdx_libreoffice.pdf");
	if (!outputFile.exists()) {
		convert(inputFile, outputFile);
	}
	File destFile = new File("E:/ConvertTester/TestFiles/I_am_a_vsdx_libreoffice_watermark.pdf");
	final String IMG = "D:\\Xiaoi\\logo\\logo.png";
	//转换成 pdf 后利用 itext 加水印 
	PdfReader reader = new PdfReader(new FileInputStream(outputFile));
	PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(destFile));
	int pageNo = reader.getNumberOfPages();
	// text watermark
	Font f = new Font(FontFamily.HELVETICA, 30);
	Phrase p = new Phrase("Xiaoi Robot Image", f);
	// image watermark
	Image img = Image.getInstance(IMG);
	float w = img.getScaledWidth();
	float h = img.getScaledHeight();
	// transparency
	PdfGState gs1 = new PdfGState();
	gs1.setFillOpacity(0.5f);
	// properties
	PdfContentByte over;
	Rectangle pagesize;
	float x, y;
	// loop over every page
	for (int i = 1; i <= pageNo; i++) {
		pagesize = reader.getPageSizeWithRotation(i);
		x = (pagesize.getLeft() + pagesize.getRight()) / 2;
		y = (pagesize.getTop() + pagesize.getBottom()) / 2;
		over = stamper.getOverContent(i);
		over.saveState();
		over.setGState(gs1);
		if (i % 2 == 1)
			ColumnText.showTextAligned(over, Element.ALIGN_CENTER, p, x, y, 0);
		else
			over.addImage(img, w, 0, 0, h, x - (w / 2), y - (h / 2));
		over.restoreState();
	}
	stamper.close();
	reader.close();
}