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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.

Figure 9-23. Calculating the additional bonus amounts with worksheet formulas To calculate the additional bonus within the pivot table, you ll use a similar formula, but you ll use the Qty field and the TotalPrice field, instead of cell references. You ll add the Qty field to the pivot table layout and then create the new calculated field: 1. Select a cell in the pivot table.

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);

Note An interface is a set of method signatures that serves as a contract for classes that implement that

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

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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.

interface. When a class implements an interface, the class guarantees that it will implement every signature defined in that interface. An interface cannot be instantiated like a normal class because it doesn t contain any method implementations, only their signatures. By implementing IPipelineSection in all order pipeline section classes (you ll write them in the next chapter), you guarantee that they all will export a public method named Process. This way, you can safely call the Process method on any pipeline section class from your OrderProcessor class without the risk of generating an error.

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(); }

2. In the PivotTable Field List pane, add a check mark to the Qty field to add it to the Values area as Sum of Qty. The pivot table now shows the total quantity for bar sales for each store in December 2007, and stores 3055 and 3082 have quantities greater than 1,000 (see Figure 9-24). Their sales will be eligible for the special bonus.

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

All pipeline sections use a Process method to perform their work. This method requires an OrderProcessor reference as a parameter because the pipeline sections need access to the public fields and methods exposed by the OrderProcessor class. The last part of the Process method in OrderProcessor involves catching exceptions. Here, you catch any exceptions that may be thrown by the order pipeline section classes and react to them by sending an email to the administrator using the MailAdmin method, adding an audit entry, and throwing a new exception that can be caught by PHP pages that use the OrderProcessor class: catch(Exception $e) { $this->MailAdmin('Order Processing error occurred.', 'Exception: "' . $e->getMessage() . '" on ' . $e->getFile() . ' line ' . $e->getLine(), $this->_mOrderProcessStage); $this->CreateAudit('Order Processing error occurred.', 10002); throw new Exception('Error occurred, order aborted. ' . 'Details mailed to administrator.'); } Regardless of whether processing is successful, you add a final audit entry saying that the processing has completed: $this->CreateAudit('Order Processor finished.', 10001); }

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.

10.4 Summary