barcode generator source code in c#.net Class diagram of DrawInterface implementations in Java

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Class diagram of DrawInterface implementations
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VERTICAL POSITION MARKS
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Suppose that you want to create an alphabetical list of directors, and to list the movies directed by these filmmakers that are present in the database. To this list, you want to add an arrow that indicates which directors have more than two movies in the database. You also want to indicate all the movies that were made in the year 2000 or later. See figure 2.9 for an example.
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Vertical position marks
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Using iText s basic building blocks
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You can achieve this by subclassing VerticalPositionMark.
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Listing 2.17 PositionedArrow.java
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public class PositionedArrow extends VerticalPositionMark { protected boolean left; ... public static final PositionedArrow LEFT = new PositionedArrow(true); public static final PositionedArrow RIGHT = new PositionedArrow(false); ... public void draw(PdfContentByte canvas, float llx, float lly, float urx, float ury, float y) { canvas.beginText(); canvas.setFontAndSize(zapfdingbats, 12); if (left) { canvas.showTextAligned(Element.ALIGN_CENTER, String.valueOf((char)220), llx - 10, y, 0); } else { canvas.showTextAligned(Element.ALIGN_CENTER, String.valueOf((char)220), urx + 10, y + 8, 180); } canvas.endText(); } }
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Instance to draw arrow to the left Instance to draw arrow to the right
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Custom implementation of draw() method
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You could use Document.add() to add instances of this PositionedArrow class to the Document because it extends VerticalPositionMark, which means it also implements the Element interface. When this Element is encountered, the custom draw() method will be invoked, and this method has access to the canvas to which content is added. It also knows the coordinates defining the margins of the page, (llx, lly) and (urx, ury), as well as the current y position on the page. In the draw() method of the PositionedArrow class, listing 2.17 uses llx and urx to draw an arrow in the left or right margin of the page, and it uses the y value to position the arrow. Observe that in this example PositionedArrow is not added directly to the Document.
Listing 2.18 DirectorOverview1.java
LineSeparator line = new LineSeparator( 1, 100, null, Element.ALIGN_CENTER, -2); Paragraph stars = new Paragraph(20); stars.add(new Chunk(StarSeparator.LINE)); stars.setSpacingAfter(30);
Creates LineSeparator
while (rs.next()) { director = PojoFactory.getDirector(rs); Paragraph p = new Paragraph( PojoToElementFactory.getDirectorPhrase(director));
Adding Chunk, Phrase, Paragraph, and List objects
if (rs.getInt("c") > 2) p.add(PositionedArrow.LEFT); p.add(line); document.add(p);
Adds left-positioned arrow next to director name
TreeSet<Movie> movies = new TreeSet<Movie>( new MovieComparator(MovieComparator.BY_YEAR)); movies.addAll( PojoFactory.getMovies(connection, rs.getInt("id"))); for (Movie movie : movies) { p = new Paragraph(movie.getMovieTitle()); p.add(": "); p.add(new Chunk(String.valueOf(movie.getYear()))); if (movie.getYear() > 1999) p.add(PositionedArrow.RIGHT); document.add(p); } document.add(stars); }
Adds rightpositioned arrow next to movie title
The arrow refers to the content of a Paragraph, and it s better to add it to the corresponding object, as is done in C and D. Otherwise a page break could cause the text to be on one page and the arrow on the next; that could be your intention in some situations, but that s not the case here.
LINE SEPARATORS
When you need to draw a line, you want to know the current vertical position of the text of a page. In that situation, you can get a long way using the LineSeparator class. In B of listing 2.18, you create a line separator with the following parameters:
The line width In this case, a line with a thickness of 1 pt. The percentage that needs to be covered In this case, 100 percent of the available width. A color In this case, null, meaning that the default color will be used. The alignment This only makes sense if the percentage isn t 100 percent. The offset In this case, 2 pt below the baseline.
If this object isn t sufficient for your needs, you can write your own subclass of VerticalPositionMark, or your own (custom) implementation of the DrawInterface.
Listing 2.19 StarSeparator.java
public class StarSeparator implements DrawInterface { ... public void draw(PdfContentByte canvas, float llx, float lly, float urx, float ury, float y) { float middle = (llx + urx) / 2; canvas.beginText(); canvas.setFontAndSize(bf, 10); canvas.showTextAligned(Element.ALIGN_CENTER, "*", middle, y, 0); canvas.showTextAligned(Element.ALIGN_CENTER, "* *", middle, y -10, 0);
CHAPTER 2 canvas.endText(); } }
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Observe that the StarSeparator object doesn t implement the Element interface. This means you can t add it directly to the Document. You need to wrap it in a Chunk object first.
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