barcode generator source code in c#.net A PDF with a different origin in Java

Creating QR in Java A PDF with a different origin

A PDF with a different origin
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Overview of the page boundaries
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The cross that is drawn in figure 5.9 (close to my navel) marks the origin of the coordinate system.
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Listing 5.16 Hero1.java (continued)
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Rectangle rect = new Rectangle(-1192, -1685, 1192, 1685); Specifies page size Document document = new Document(rect); with negative origin PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename)); document.open(); PdfContentByte content = writer.getDirectContent(); PdfTemplate template = createTemplate(content, rect, 4); Adds template with content.addTemplate(template, -1195, -1685); negative offset content.moveTo(-595, 0); Draws line from content.lineTo(595, 0); negative to positive X content.moveTo(0, -842); Draws line from content.lineTo(0, 842); negative to position Y content.stroke(); document.close();
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If you look at all the PDFs that can be found in the wild, you ll discover that the lowerleft corner is the origin of the coordinate system for most PDF documents. This example proves that you shouldn t assume that this is true for every possible PDF. Knowing this will be important when you start manipulating existing PDFs in the next chapter. When you add content at an absolute position, you ll need to take the (x,y) value of the origin into account if it s different from (0,0). Otherwise, you risk adding content in the wrong place, maybe even outside the visible area of the page. You also have to make sure not to add anything outside the crop box of the page.
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The crop box
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The crop box is another type of boundary that can be defined as a rectangle that differs from the media box. The crop box defines the region to which the contents of the page shall be clipped (cropped) when displayed or printed. Unlike the other boxes, the crop box has no defined meaning in terms of physical page geometry or intended use; it merely imposes clipping on the page contents. However, in the absence of additional information ..., the crop box determines how the page s contents shall be positioned on the output medium. The default value is the page s media box. ISO-32000-1:2008, section 14.1.2 Suppose I want to print my A0 Superman poster, but I have a printer that is only able to print A4 pages. As defined in ISO-216, an A4 page can be obtained by folding an A0 page 4 times. My printing problem could be solved if I manage to split the single page shown in figure 5.9 into 16 smaller pages. See figure 5.10 for the result. Now I can print the A0 as 16 separate pages, and I can start gluing them together into one large page. To achieve this, I ll specify a media box with size A0, but I ll use the setCropBox() method to define a crop box with size A4.
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Table, cell, and page events
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Figure 5.10 An A0 sized page divided into 16 A4 pages
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Listing 5.17 Hero2.java
float w = PageSize.A4.getWidth(); Defines float h = PageSize.A4.getHeight(); MediaBox size Rectangle rect = new Rectangle(-2*w, -2*h, 2*w, 2*h); Rectangle crop = new Rectangle(-2*w, h, -w, 2*h); Defines Document document = new Document(rect); CropBox size PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename)); writer.setCropBoxSize(crop); Sets document.open(); CropBox size PdfContentByte content = writer.getDirectContent(); PdfTemplate template = createTemplate(content, rect, 4); float adjust; while(true) { Adds template content.addTemplate(template, -2*w, -2*h); adjust = crop.getRight() + w; if (adjust > 2 * w) { adjust = crop.getBottom() - h; if (adjust < - 2 * h) break; crop = new Rectangle( Defines new -2*w, adjust, -w, crop.getBottom()); CropBox size } else { crop = new Rectangle( crop.getRight(), crop.getBottom(), adjust, crop.getTop()); } writer.setCropBoxSize(crop); Sets new document.newPage(); CropBox size } document.close();
Overview of the page boundaries
This code snippet crops the large image into smaller parts, sixteen times in a row. First I create a Rectangle that is about the size of an A0 page B. I ll use this object as the media box. Note that this line defines an origin with a negative X and Y, just like in the previous example. Then I create a page that s the size of an A4 page C. Compared to the Rectangle defined in B, it s positioned in the top-left corner of the media box. I ll use this second rectangle as the crop box D. Next, I add the Superman template multiple times to the document in a loop E. Because of the crop box, the first page will be blank. The visible area on the A0 poster is cropped to the size of an A4 page in the upper-left corner. For the next pages, I redefine the crop box F. I continue with the next A4 rectangle that fits inside the A0 page to the right of the previous page. If that s not possible, I start with the first A4 rectangle on the next row. As long as I can create valid A4 pages, I use these rectangles to set a new crop box value that will be valid for the next page G. The result will be a PDF document with 16 pages, each page clipped to an A4 that reveals part of the complete A0 poster. But suppose that I don t want to print the poster myself. Instead I want to send the PDF to a graphical designer, asking them to add a nice caption, some publicity for this book, and so on. However, I don t want the image altered or overwritten, so I need to define a region that is preserved for the Superman drawing. I could use an art box to pass this information to a third party. That s one of the three remaining page boundaries discussed in the next section.
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