问题
I'm trying to export text and SVG graphs to a PDF. I found out that iText and batik can do this. So I tried doing that, but everytime I put in a graph, it would become extraordinary small.
I thought it might be something with my code, so I figured I would try an examplecode from Vaadin.
public class PdfExportDemo {
private String fontDirectory = null;
private final String baseFont = "Arial";
private PdfWriter writer;
private Document document;
private Font captionFont;
private Font normalFont;
private String svgStr;
/**
* Writes a PDF file with some static example content plus embeds the chart
* SVG.
*
* @param pdffilename
* PDF's filename
* @param svg
* SVG as a String
* @return PDF File
*/
public File writePdf(String pdffilename, String svg) {
svgStr = svg;
document = new Document();
document.addTitle("PDF Sample");
document.addCreator("Vaadin");
initFonts();
File file = null;
try {
file = writeToFile(pdffilename, document);
document.open();
writePdfContent();
document.close();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
/**
* Get Font directory that will be checked for custom fonts.
*
* @return Path to fonts
*/
public String getFontDirectory() {
return fontDirectory;
}
/**
* Set Font directory that will be checked for custom fonts.
*
* @param fontDirectory
* Path to fonts
*/
public void setFontDirectory(String fontDirectory) {
this.fontDirectory = fontDirectory;
}
private void initFonts() {
if (fontDirectory != null) {
FontFactory.registerDirectory(fontDirectory);
}
captionFont = FontFactory.getFont(baseFont, 10, Font.BOLD, new Color(0,
0, 0));
normalFont = FontFactory.getFont(baseFont, 10, Font.NORMAL, new Color(
0, 0, 0));
}
private File writeToFile(String filename, Document document)
throws DocumentException {
File file = null;
try {
file = File.createTempFile(filename, ".pdf");
file.deleteOnExit();
FileOutputStream fileOut = new FileOutputStream(file);
writer = PdfWriter.getInstance(document, fileOut);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
private void writePdfContent() throws DocumentException, IOException {
Paragraph caption = new Paragraph();
caption.add(new Chunk("Vaadin Charts Export Demo PDF", captionFont));
document.add(caption);
Paragraph br = new Paragraph(Chunk.NEWLINE);
document.add(br);
Paragraph paragraph = new Paragraph();
paragraph.add(new Chunk("This PDF is rendered with iText 2.1.7.",
normalFont));
document.add(paragraph);
paragraph = new Paragraph();
paragraph
.add(new Chunk(
"Chart below is originally an SVG image created with Vaadin Charts and rendered with help of Batik SVG Toolkit.",
normalFont));
document.add(paragraph);
document.add(createSvgImage(writer.getDirectContent(), 400, 400));
document.add(createExampleTable());
}
private PdfPTable createExampleTable() throws BadElementException {
PdfPTable table = new PdfPTable(2);
table.setHeaderRows(1);
table.setWidthPercentage(100);
table.setTotalWidth(100);
// Add headers
table.addCell(createHeaderCell("Browser"));
table.addCell(createHeaderCell("Percentage"));
// Add rows
table.addCell(createCell("Firefox"));
table.addCell(createCell("45.0"));
table.addCell(createCell("IE"));
table.addCell(createCell("26.8"));
table.addCell(createCell("Chrome"));
table.addCell(createCell("12.8"));
table.addCell(createCell("Safari"));
table.addCell(createCell("8.5"));
table.addCell(createCell("Opera"));
table.addCell(createCell("6.2"));
table.addCell(createCell("Others"));
table.addCell(createCell("0.7"));
return table;
}
private PdfPCell createHeaderCell(String caption)
throws BadElementException {
Chunk chunk = new Chunk(caption, captionFont);
Paragraph p = new Paragraph(chunk);
p.add(Chunk.NEWLINE);
p.add(Chunk.NEWLINE);
PdfPCell cell = new PdfPCell(p);
cell.setBorder(0);
cell.setBorderWidthBottom(1);
cell.setHorizontalAlignment(PdfPCell.ALIGN_LEFT);
cell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);
return cell;
}
private PdfPCell createCell(String value) throws BadElementException {
PdfPCell cell = new PdfPCell(new Phrase(new Chunk(value, normalFont)));
cell.setBorder(0);
cell.setHorizontalAlignment(PdfPCell.ALIGN_LEFT);
return cell;
}
private Image drawUnscaledSvg(PdfContentByte contentByte)
throws IOException {
// First, lets create a graphics node for the SVG image.
GraphicsNode imageGraphics = buildBatikGraphicsNode(svgStr);
// SVG's width and height
float width = (float) imageGraphics.getBounds().getWidth();
float height = (float) imageGraphics.getBounds().getHeight();
// Create a PDF template for the SVG image
PdfTemplate template = contentByte.createTemplate(width, height);
// Create Graphics2D rendered object from the template
Graphics2D graphics = template.createGraphics(width, height);
try {
// SVGs can have their corner at coordinates other than (0,0).
Rectangle2D bounds = imageGraphics.getBounds();
graphics.translate(-bounds.getX(), -bounds.getY());
// Paint SVG GraphicsNode with the 2d-renderer.
imageGraphics.paint(graphics);
// Create and return a iText Image element that contains the SVG
// image.
return new ImgTemplate(template);
} catch (BadElementException e) {
throw new RuntimeException("Couldn't generate PDF from SVG", e);
} finally {
// Manual cleaning (optional)
graphics.dispose();
}
}
/**
* Use Batik SVG Toolkit to create GraphicsNode for the target SVG.
* <ol>
* <li>Create SVGDocument</li>
* <li>Create BridgeContext</li>
* <li>Build GVT tree. Results to GraphicsNode</li>
* </ol>
*
* @param svg
* SVG as a String
* @return GraphicsNode
* @throws IOException
* Thrown when SVG could not be read properly.
*/
private GraphicsNode buildBatikGraphicsNode(String svg) throws IOException {
UserAgent agent = new UserAgentAdapter();
SVGDocument svgdoc = createSVGDocument(svg, agent);
DocumentLoader loader = new DocumentLoader(agent);
BridgeContext bridgeContext = new BridgeContext(agent, loader);
bridgeContext.setDynamicState(BridgeContext.STATIC);
GVTBuilder builder = new GVTBuilder();
GraphicsNode imageGraphics = builder.build(bridgeContext, svgdoc);
return imageGraphics;
}
private SVGDocument createSVGDocument(String svg, UserAgent agent)
throws IOException {
SVGDocumentFactory documentFactory = new SAXSVGDocumentFactory(
agent.getXMLParserClassName(), true);
SVGDocument svgdoc = documentFactory.createSVGDocument(null,
new StringReader(svg));
return svgdoc;
}
private Image createSvgImage(PdfContentByte contentByte,
float maxPointWidth, float maxPointHeight) throws IOException {
Image image = drawUnscaledSvg(contentByte);
image.scaleToFit(maxPointWidth, maxPointHeight);
return image;
}
}
But when I do this, I still get the small graph. I tried debugging the app, and the size og the graph is actually 10000x600, and then it tries to scale it to fit.
So I tried manually setting the size to like 400x600, no dice. I tried forcing the size on the SVG - no dice. And if I make it, I think, too big then it simply shows a small 1x1cm box with shadows. The output from the example is as follows.
I really hope someone can help.
UPDATE When I remove these two lines:
Rectangle2D bounds = imageGraphics.getBounds();
graphics.translate(-bounds.getX(), -bounds.getY());
and hardcode the sizes, It kinda works. But the image itself is stil enourmous, and can't seem to fit it. see for example:
来源：https://stackoverflow.com/questions/37699693/generating-pdf-with-itext-and-batik