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The spacesPhotoSlide mashup shows a user s family photos taken during a trip to Italy that have been uploaded to a Windows Live Spaces account. The pictures are displayed using a Photo display block that is fed by the Spaces photo block. Dynamic animation flips backward and forward through the pictures as if you were holding them in your hand (see Figure 2-14).

<Path StrokeThickness="10" Data="M50,0 L100,50 C125,74 75,125 50,100 L0,50 z" > <Path.Fill> <RadialGradientBrush> <GradientStop Offset="0" Color="Blue" /> <GradientStop Offset="1" Color="White" /> </RadialGradientBrush>

</Path.Fill> <Path.Stroke> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <GradientStop Offset="0" Color="Black" /> <GradientStop Offset="0.5" Color="White" /> <GradientStop Offset="1" Color="Black" /> </LinearGradientBrush> </Path.Stroke> </Path>

As you can see in Figure 20-10, these brushes change color across the shape. The radial brush starts from a point in the middle (or some other point there are properties to control the exact settings) and spreads out to an elliptical boundary. The linear gradient brush simply changes colors between the specified start and end points. Notice that you can run through as many different colors as you like with the GradientStop elements.

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XSS attacks can be particularly damaging in situations in which a stored XSS attack propagates from user account to user account in a worm-like pattern (we discussed worms that exploit vulnerabilities in serverside applications to propagate from server to server in 5). For example, in 2005, an XSS worm was released on the MySpace social networking site. The worm exploited an XSS vulnerability in the MySpace application that allowed stored XSS to propagate from user profile page to user profile page along the friend relationships within the MySpace social network. The actual payload of this worm was fairly harmless; it simply added a particular user, Samy, to the list of the infected user s friends. Nevertheless, MySpace had to be shut down for several hours to clean up the infected profiles and prevent additional XSS. Needless to say, the impact of an XSS worm could be much worse.

You can even create a bitmap-based brush with which to paint shapes, so let s look at bitmap handling next.

The shape elements are great for graphics that can be built out of geometric elements. Skilled designers can produce remarkably realistic-looking imagery with these sorts of primitives using tools such as Adobe Illustrator. However, some kinds of pictures do not lend themselves to this sort of construction photographs, for example. You might be able to draw a stylized rendition of a photograph, but if you just want to incorporate a photographic image directly into an application, bitmaps are the way to go. Bitmaps are pixel-oriented rather than vector-based. (From a tool perspective, it s like the distinction between Adobe Photoshop and Adobe Illustrator.) Bitmaps do not scale as well if you enlarge a bitmap, eventually you just see the individual pixels, leading to an appearance that is either jagged or fuzzy, depending on the way in which the bitmap is enlarged. Shapes don t have that problem; because shapes are geometrically defined, WPF or Silverlight can render them perfectly crisply no matter how large you

make them. So there s a trade-off here bitmaps can offer a much more photorealistic impression than vector art, but they don t adapt so well to changes in size. That s why graphics systems need to support both. The simplest way to use a bitmap is with the <Image> element. You can point its Source property at any URL that contains a bitmap. Example 20-13 uses a miscellaneous image from one of the authors blogs. WPF or Silverlight will download and display the image at runtime. (The image may not appear in the design view, though.)

The Stretch property indicates how to size the image. The value None says that we want the image to be rendered at its natural size. The Image element s default behavior is to resize the bitmap so that it fills the layout slot, but that s not always appropriate. This particular image happens to be a screenshot, and those tend to go a bit blurry if you resize them, so disabling stretching is a good idea here. Resizing is less problematic for photographs, though, so the default behavior of stretching to fit is useful there. The Image class is a user interface element, deriving from FrameworkElement like any other. But there s also ImageBrush this derives from a different class, Brush, in common with the gradient brushes we saw earlier. You can use an ImageBrush to paint a shape. Example 20-14 uses the same image to provide the Fill of a Path. (Again, you may find that the image appears only at runtime, not at design time.)

<Path StrokeThickness="3" Stroke="Black" Data="M50,0 L100,50 C125,74 75,125 50,100 L0,50 z" > <Path.Fill> <ImageBrush ImageSource="http://www.interact-sw.co.uk/images/WpfMidpointGradient.png" /> </Path.Fill> </Path>

However, we note that stored and reflected XSS are not fundamentally different; in both cases, the underlying issue is that untrusted data can be delivered to a user s browser such that script chosen by the attacker is executed in the user s browser in the context of the vulnerable application.

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