java qr code reader for mobile ADAPTING THE TIMETABLE EXAMPLE in Java

Creator QR Code 2d barcode in Java ADAPTING THE TIMETABLE EXAMPLE

ADAPTING THE TIMETABLE EXAMPLE
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In section 3.1.3, you added a grid with locations and time slots to every page of your timetable document. It would have been a better idea to draw the grid with the locations to one PdfTemplate object, and the grid with the time slots to another.
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Listing 3.29 MovieTemplates.java
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PdfContentByte over = writer.getDirectContent(); PdfContentByte under = writer.getDirectContentUnder(); ... PdfTemplate t_under = under.createTemplate( Creates XObject PageSize.A4.getHeight(), PageSize.A4.getWidth()); for lower layer drawTimeTable(t_under); PdfTemplate t_over = over.createTemplate( PageSize.A4.getHeight(), PageSize.A4.getWidth()); Creates XObject drawTimeSlots(t_over); for upper layer drawInfo(t_over); List days = PojoFactory.getDays(connection); List screenings; int d = 1; Adds timeslot XObject for (Date day : days) { to upper layer over.addTemplate(t_over, 0, 0); under.addTemplate(t_under, 0, 0); Adds locations XObject drawDateInfo(day, d++, over); to lower layer Adds content screenings that varies = PojoFactory.getScreenings(connection, day); from page to for (Screening screening : screenings) { page drawBlock(screening, under, over);
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Adding content at absolute positions Adds content that varies from page to page
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drawMovieInfo(screening, over); } document.newPage(); }
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The MovieTemplates example (listing 3.29) extends MovieCalendar (listing 3.15) so that methods such as drawTimeTable() and drawTimeSlots() can be reused. If you open both PDFs in Adobe Reader, you ll see no difference at all between them, except when you go to File > Properties > Description. The PDF generated with MovieCalendar has a size of 18.82 KB; the one generated with MovieTemplates has a size of 14.29 KB. This means we ve saved almost 25 percent in file size by using form XObjects in this example. Isn t that a nice way to conclude chapter 3
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In the first section of this chapter, you learned how iText adds content to a page. High-level objects are written to two layers in the middle. You have low-level access to an extra level on top of these layers and an extra level below. Low-level access means that you can change the graphics state to fill and stroke lines and shapes; you change the text state to draw glyphs. You used this knowledge to make a visual representation of the data in the film festival database. You drew a grid with locations and time slots, on which you added blocks representing movie screenings. Movie titles were added with the ColumnText object. This object forms a bridge between the high-level objects and low-level access. You added content in columns, and you experienced the difference between text mode (Chunk and Phrase objects added with addText()) and composite mode (implementations of the Element interface added with addElement()). You also used ColumnText in simulation mode to keep content that belongs together in the same column. Finally, the PdfTemplate object was introduced, allowing you to create extra layers that can be reused on the same page or on different pages. In the next chapter, you ll learn how to organize the information about the film festival movies in tabular form using PdfPTable and PdfPCell. You ll learn that each PdfPCell uses a ColumnText internally to draw the content of a cell at the correct position.
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Organizing content in tables
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This chapter covers
Constructing a PdfPTable object Exploring the properties of a PdfPCell object Adding tables to the Document object
iText has existed for more than ten years now. If you were to ask me which objects have been the most important in the iText-related projects I ve done in all those years, I wouldn t have to think twice about the answer. Most of my assignments have consisted of creating reports that render the content of a database to a PDF document. This content had to be organized in tabular form. This can be achieved using two classes that are important enough to be the focus of an entire chapter: PdfPTable and PdfPCell. We ll start with simple examples, then move on to more complex tables using the data from the movie database.
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