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Creation PDF 417 in Visual C#.NET Printing, documents, and XPS

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Listing 18.7 Adding an empty Border
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Border border = new Border(); border.BorderBrush = Brushes.Black; border.BorderThickness = new Thickness(1); border.Width = (4 * 96); What s border.Height = (6 * 96); with 96 Canvas.SetLeft(border, 96); Canvas.SetTop(border, 3 * 96); canvas.Children.Add(border);
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This code is put into the OnPrintFixed() method after the creation of the Ellipse and before the print operation. There s nothing very spectacular here, although you may notice the preponderance of values based on the number 96. Although it s, coincidentally, our lucky number, the real reason we use 96 is because the default WPF units are dips, and there happen to be 96 dips in an inch. Our border is 4 inches wide, 6 inches tall, one inch in from the left, and 3 inches down from the top. If we run the print operation, we d now get an empty box of the described dimensions. But, we d like something in that box. Listing 18.8 shows how to get the first 4x6 page of the contents from our definition.
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Listing 18.8 Getting a page from a FlowDocument
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FlowDocument docCopy = CopyFlowDocument(searchResults.Document); docCopy.ColumnWidth = double.NaN; docCopy.PageWidth = border.Width - 2; Border, minus docCopy.PageHeight = border.Height - 2; space for lines IDocumentPaginatorSource paginatorSource = docCopy as IDocumentPaginatorSource; DocumentPage docPage = paginatorSource.DocumentPaginator.GetPage(0);
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Much of this code should be familiar we make a copy of the FlowDocument and set its size, although we re using the size of the Border control to determine the width and height b, minus a little bit to make up for the lines on either size. Then we get a paginator as if we re going to print. Instead of printing, though, we ask the paginator for the first page c. If we were going to put more content on multiple pages or multiple locations, the paginator could be used to provide the pages as needed. A DocumentPage isn t terribly useful, though. It has virtually no properties or methods, and it can t do very much. We need to get the page into a format that we can put onto our page. An easy way to do this is to draw the page out onto a bitmap, and then put the bitmap on our page. Listing 18.9 shows how to do that.
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Listing 18.9 Rendering to a bitmap
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RenderTargetBitmap renderTarget = new RenderTargetBitmap ((int)docCopy.PageWidth,(int)docCopy.PageHeight,96,96, System.Windows.Media.PixelFormats.Default); renderTarget.Render(docPage.Visual); Image img = new Image();
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Renders page
Creates target
Printing FixedDocuments
img.Width = docCopy.PageWidth; img.Height = docCopy.PageHeight; img.Source = renderTarget; border.Child = img;
The first thing we do is create a RenderTargetBitmap of the appropriate size and with the appropriate resolution b. The whole purpose of a RenderTargetBitmap is to make it possible to convert a Visual object into a bitmap. As you probably remember from chapter 14, Visual is a pretty high-level class that provides basic low-level support for things that need to be able to render themselves (as well as support for hit testing, and so on). Controls are, eventually, derived from Visual, because they re derived from UIElement. If the document page exposed a UIElement, we could add it directly to our Canvas; but, unfortunately, DocumentPage only exposes a Visual object, so we have to first render the Visual into something else before we can add it. The Render c method on RenderTargetBitmap causes the passed object to render itself out to the bitmap or, in English, to draw our page. Then, all we have to do is shove our bitmap into an Image control and put the Image control inside our Border d. We wouldn t say that this is all trivial, but it isn t ridiculously complex either. Figure 18.8 shows the results of all our machinations. Very avant-garde, wouldn t you say One thing, though, is that the page we ve printed is a little fuzzy much more so than the Hello at the top of the page. The reason
Figure 18.8 We ve pulled out a page from our FlowDocument and rendered it as part of our printout. The page is a little bit fuzzy we need to do something about that.
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