c# print barcode zebra Media in Silverlight: Rich Imaging in Visual Studio .NET

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11 Media in Silverlight: Rich Imaging
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The HandleMouseWheel function is as follows:
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private void HandleMouseWheel(object sender, HtmlEventArgs args) { double delta = 0; ScriptObject eventObj = args.EventObject; if (eventObj.GetProperty("wheelDelta") != null) { delta = ((double)eventObj.GetProperty("wheelDelta")) / 120; if (HtmlPage.Window.GetProperty("opera") != null) delta = -delta; } else if (eventObj.GetProperty("detail") != null) { delta = -((double)eventObj.GetProperty("detail")) / 3; if (HtmlPage.BrowserInformation.UserAgent.IndexOf("Macintosh") != -1) delta = delta * 3; } if (delta != 0 && this.Moved != null) { MouseWheelEventArgs wheelArgs = new MouseWheelEventArgs(delta); this.Moved(this, wheelArgs); if (wheelArgs.Handled) args.PreventDefault(); } }
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This function takes an HtmlEventArgs object as an argument. The HtmlEventArgs object contains an EventObject as one of its children. The EventObject provides the mouse wheel button metadata, such as wheelDelta, which indicates a change in direction resulting from rotation of the mouse wheel button. Different browsers report different values for example, Opera returns the opposite value of other browsers so code to handle this issue is used here.
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Collections in Deep Zoom
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In addition to being able to zoom in and zoom out of an image, you can also build collections of images and manipulate them in a zoomable environment. You might have noticed that when you export images from Deep Zoom Composer, the Create Collection option is available. As its name suggests, this option creates a collection of images. In Figure 11-8, you can see that many images are placed on the design surface. You can export these images as a collection. When you export images as a collection, as well as the dzc_output.xml file, you also get an XML file for each image, as well as another called SparseImageSceneGraph.xml that contains how each image is placed within the zoom canvas.
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Part II Programming Silverlight 3 with .NET
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In a collection, Silverlight exposes a SubImages collection that you can use to manipulate the images. Note that the full set of images is not loaded on page render, so the collection is empty at that point. Instead, make sure that you wire up the ImageOpenSucceeded event if you want to manipulate the collection. This event fires when the bin loads and renders correctly.
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FIGURE 11-8 Creating a Deep Zoom collection.
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Here s the XAML:
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<MultiScaleImage x:Name="dz" Source="/GeneratedImages/dzc_output.xml" ImageOpenSucceeded="dz_ImageOpenSucceeded" Height="480" Width="640"> </MultiScaleImage>
At this point, the SubImages collection is populated, and you can use it to manipulate individual images. Here s an example of changing the position of the images:
private void dz_ImageOpenSucceeded(object sender, RoutedEventArgs e) { int nImages = dz.SubImages.Count; for (int lp = 0; lp < nImages; lp++) { dz.SubImages[lp].ViewportOrigin = new Point(lp*0.1, lp*0.1); } }
11 Media in Silverlight: Rich Imaging
As you can see, the process is exactly the same as the one used earlier to manipulate a single image. In the case of collections, each image is manipulated by using SubImages[lp], where lp is a loop variable that counts from 0 up to the number of images in the collection. You can see the results in Figure 11-9. Note the difference between this and the original layout, as shown in Figure 11-8.
FIGURE 11-9 Laying out an image collection.
With Deep Zoom Composer, you also can stitch pictures together to make them zoomable. You might not have a camera that can create a 2-GB image with a super high resolution, but you can take many pictures of the same scene and stitch them together for the same effect. Think about it. Say, you have a 4-megapixel camera, so you can take only 4-megapixel shots that, when deep zoomed, will not look as good as images you take with a (for example) 400megapixel camera. But what if you could take lots of close-up shots of your subject and then stitch them together Effectively, you can compose an image with many more megapixels than contained in a single image. A feature of Deep Zoom Composer allows you to do just this. For example, Figure 11-10 and Figure 11-11 are two of five images I captured of a tall vertical painting I picked up in a Beijing market.
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