java qr code reader library Page content and structure in Java

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Page content and structure
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Changing visibility using actions
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the less user-friendly this panel will be. It would be better to add clickable areas to the document that allow you to make one or more answers visible. This is illustrated in the next example.
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Listing 15.8 OptionalContentActionExample.java
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PdfLayer a1 = new PdfLayer("answer 1", writer); PdfLayer a2 = new PdfLayer("answer 2", writer); PdfLayer a3 = new PdfLayer("answer 3", writer); Creates three a1.setOn(false); layers a2.setOn(false); a3.setOn(false); ... ArrayList<Object> stateOn = new ArrayList<Object>(); stateOn.add("ON"); Creates list stateOn.add(a1); for ON state stateOn.add(a2); stateOn.add(a3); PdfAction actionOn = PdfAction.setOCGstate(stateOn, true); ArrayList<Object>stateOff = new ArrayList<Object>(); stateOff.add("OFF"); Creates list Creates stateOff.add(a1); for OFF state action stateOff.add(a2); stateOff.add(a3); PdfAction actionOff = PdfAction.setOCGstate(stateOff, true); ArrayList<Object> stateToggle = new ArrayList<Object>(); stateToggle.add("Toggle"); Creates list stateToggle.add(a1); for Toggle stateToggle.add(a2); state stateToggle.add(a3); PdfAction actionToggle = PdfAction.setOCGstate(stateToggle, true); Phrase p = new Phrase("Change the state of the answers:"); Chunk on = new Chunk(" on ").setAction(actionOn); p.add(on);
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Making content visible or invisible
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Chunk off = new Chunk("/ off ").setAction(actionOff); p.add(off); Chunk toggle = new Chunk("/ toggle").setAction(actionToggle); p.add(toggle); document.add(p);
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The setOCGState() static method returns a PdfAction object B. The first parameter is an ArrayList, and the first element in this list defines the action: the layers that are added can be turned on ("ON"), turned off ("OFF"), or toggled ("Toggle"). The second parameter makes sense only if you ve defined radio groups. If it s false, the fact that a layer belongs to a radio group is ignored. If it s true, turning on a layer that belongs to a radio group turns off the other layers in the radio group. Up until now, you ve marked content as optional in the content stream, using PdfContentByte methods. You can also mark specific objects as optional.
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15.1.5 Optional content in XObjects and annotations
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Three types of iText objects are often drawn in an OCG: Images, PdfTemplates, and PdfAnnotations. For convenience, these objects have a setLayer() method that can be used to define the OCG to which the object belongs. Figure 15.4 shows a map of Foobar. People from all over the world will be coming to the Foobar Film Festival, and to make sure these people find their way to the movie theater, you ll create a map of the city. You ll add the street names in three languages English, French, and Dutch and put these street names in different layers, organized as a radio group, so that only one layer is visible at a time. You ll also add more layers showing information about restaurants, movie theaters, and so on. End users can switch these layers on and off depending on what they re looking for in the city of Foobar. This PDF is created from an SVG file, foobarcity.svg containing the map (lines and shapes), and three SVG files, foobarstreets.svg, foobarrues.svg, and foobarstraten.svg, containing the street names in English, French, and Dutch (text only). iText can t
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The interactive map of Foobar
Page content and structure
interpret these files. You could try to write your own SVG handler (as was done in the first edition of this book), but it s easier to use a library that already exists, such as Apache Batik. This listing creates the map without the optional content layers.
Listing 15.9 SvgToPdf.java
protected SAXSVGDocumentFactory factory; protected BridgeContext ctx; protected GVTBuilder builder; public SvgToPdf() { String parser = XMLResourceDescriptor.getXMLParserClassName(); factory = new SAXSVGDocumentFactory(parser); Performs UserAgent userAgent = new UserAgentAdapter(); Batik-specific DocumentLoader loader = new DocumentLoader(userAgent); initializations ctx = new BridgeContext(userAgent, loader); ctx.setDynamicState(BridgeContext.DYNAMIC); builder = new GVTBuilder(); } public void drawSvg(PdfTemplate map, String resource) throws IOException { Graphics2D g2d = map.createGraphics(6000, 6000); SVGDocument city = factory.createSVGDocument( new File(resource).toURL().toString()); Draws SVG to GraphicsNode mapGraphics = builder.build(ctx, city); PdfTemplate mapGraphics.paint(g2d); g2d.dispose(); } public void createPdf(String filename) throws IOException, DocumentException { Document document = new Document(new Rectangle(6000, 6000)); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT)); document.open(); PdfContentByte cb = writer.getDirectContent(); PdfTemplate map = cb.createTemplate(6000, 6000); Creates and adds drawSvg(map, CITY); city template cb.addTemplate(map, 0, 0); PdfTemplate streets = cb.createTemplate(6000, 6000); Creates and adds drawSvg(streets, STREETS); streets template cb.addTemplate(streets, 0, 0); document.close(); }
The listing could easily have been an example from the previous chapter, where you used the PdfGraphics2D functionality to write to a java.awt.Graphics2D object. The lines and shapes are drawn to a PdfTemplate, and so are the street names. The streets template is added on top of the map template. In the next listing you ll create three PdfTemplate objects for the street names. You ll add these templates on top of each other but define an OCG for each of the templates, making sure that only one layer is visible at a time.
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