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What happens with the image in the template is true for all the objects you add to the direct content. Everything that is added outside the boundaries of a PdfTemplate or a page will be present in the PDF, but you won t see it in a PDF viewer. It s important to understand that iText may change the way the image is compressed, but it doesn t remove pixels. In this case, the complete picture including the name of the festival sponsor in the lower half of the image will be in the PDF file, but it won t be visible when looking at the PDF document. If you aren t satisfied with a rectangle, you can define a clipping path.

public class EnterpriseClient extends MIDlet implements CommandListener { private Form outputForm = new Form("Server Messages"); private Form inputForm = new Form("Input Message"); Set up the private TextField msgFld = application new TextField("Msg", "Test", 15, TextField.ANY); private Command okCmd = new Command("OK", Command.OK, 1); private Command exitCmd = new Command("Exit", Command.EXIT, 1); private Command sendCmd = new Command("Send", Command.SCREEN, 1); private Display display; private String sessionId;

You defined different paths in chapter 3, when you wrote lines and shapes to the direct content. With the combination of the clip() and newPath() methods, you can use such a path as a clipping path. You can reuse listing 10.20 to create the PDF shown to the right in figure 10.12. You only have to add a couple of lines.

boolean initialized = false; int methodType = 0; static final int GET = 0; String url = "http://localhost:7001/EnterpriseServletExample";

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PdfTemplate t = writer.getDirectContent().createTemplate(850, 600); t.ellipse(0, 0, 850, 600); t.clip(); t.newPath(); t.addImage(img, w, 0, 0, h, 0, -600);

When Track Changes is enabled, the TRK button on the status bar changes from gray to black, as you see in Figure 10-2.

Let s finish this chapter with one more example that demonstrates another, less obvious, way to hide part of an image.

private static final String[] choices = { "1 GET Message", "2 POST Message" }; private List menu = new List("Select:", List.IMPLICIT, choices, null); protected void startApp() throws MIDletStateChangeException { init(); display = Display.getDisplay(this); display.setCurrent(menu); } private void init(){ if (!initialized){ inputForm.append(msgFld); menu.addCommand(okCmd); menu.addCommand(exitCmd); outputForm.addCommand(okCmd); outputForm.addCommand(exitCmd); inputForm.addCommand(sendCmd); menu.setCommandListener(this); outputForm.setCommandListener(this); inputForm.setCommandListener(this); initialized = true; } } protected void pauseApp() { } protected void destroyApp(boolean unconditional) throws MIDletStateChangeException { } public void commandAction(Command cmd, Displayable displayable) { if (cmd == exitCmd){ handleExit(); } else if ((displayable == menu) && (cmd == okCmd)) { handleOK(((List)displayable).getSelectedIndex()); } else if ((displayable == inputForm) && (cmd == sendCmd)) { sendMsg(); } else { display.setCurrent(menu); } }

The PDF in figure 10.13 looks similar to the one in figure 10.12, but it also has a soft mask applied. The main difference between this and what you did for figure 10.11 is that you don t use the soft mask for the Image object, but for the GState of the direct content. The code to achieve this is rather complex, as you can see.

Handle the private void handleExit(){ button events try { notifyDestroyed(); destroyApp(true); } catch (MIDletStateChangeException x) { x.printStackTrace(); } }

PdfTemplate t2 = writer.getDirectContent() .createTemplate(850, 600); PdfTransparencyGroup transGroup = new PdfTransparencyGroup(); transGroup.put( PdfName.CS, PdfName.DEVICEGRAY); transGroup.setIsolated(true); transGroup.setKnockout(false); t2.setGroup(transGroup); int gradationStep = 30; float[] gradationRatioList = new float[gradationStep]; for(int i = 0; i < gradationStep; i++) { gradationRatioList[i] = 1 - (float)Math.sin( Math.toRadians(90.0f / gradationStep * (i + 1))); } for(int i = 1; i < gradationStep + 1; i++) { t2.setLineWidth(5 * (gradationStep + 1 - i)); t2.setGrayStroke( gradationRatioList[gradationStep - i]); t2.ellipse(0, 0, 850, 600); t2.stroke(); }

PdfDictionary maskDict = new PdfDictionary(); maskDict.put(PdfName.TYPE, PdfName.MASK ); Creates maskDict.put(PdfName.S, new PdfName("Luminosity")); Image mask maskDict.put( dictionary new PdfName("G"), t2.getIndirectReference()); PdfGState gState = new PdfGState(); Sets graphics gState.put(PdfName.SMASK, maskDict); state canvas.setGState(gState); canvas.addTemplate(t2, 0, 0); Adds XObject

private void handleOK(int idx){ display.setCurrent(inputForm); methodType = idx; } private void sendMsg(){ display.setCurrent(outputForm); processInit(); if (methodType == GET){ doGet(); } else { doPost(); } } private void doGet(){ String data = msgFld.getString(); try { String paramString = " msg="+msgFld.getString(); HttpConnection connection = getConnection(paramString); connection.setRequestMethod(HttpConnection.GET); connection.setRequestProperty("Content-Length", String.valueOf(data.length())); setCookie(connection); sendData(connection, data); receiveData(connection); processHeaderInfo(connection); System.out.println("Done."); } catch (IOException x) { System.out.println("Problems sending or receiving data."); x.printStackTrace(); } Send HTTP GET } request to server private void doPost(){ String data = msgFld.getString(); try { HttpConnection connection = getConnection(null); connection.setRequestMethod(HttpConnection.POST); connection.setRequestProperty("Content-Length", String.valueOf(data.length())); setCookie(connection); Send HTTP POST sendData(connection, data); request to server receiveData(connection); processHeaderInfo(connection);

This is an example that should be studied with this book in one hand and ISO-32000-1 in the other. This isn t the definitive chapter about colors, images, and transparency, but we ve looked at a selection of the most important functionality from the perspective of the iText developer.

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