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The declarative animation system enables tools such as Expression Blend to author animations alongside the graphics and layout design of your application The animation system has other display quality and performance advantages that 6 will explain further
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Layout The layout system is responsible for sizing and positioning content in Silverlight applications For example, the content in Figure 28 can be displayed with the following XAML:
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<A pplication xmlns="http://schemasmicrosoftcom/client/2007" xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" xmlns:myTypes="clr-namespace:HelloWorld;assembly=HelloWorld" x:Class="HelloWorldA pp" > <A pplicationRootVisual> <StackPanel> <Button FontSize="24" Content="Top"/> <Button FontSize="24" Content="Bottom"/> </StackPanel> </A pplicationRootVisual> </A pplication>
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In this example, Silverlight does the following: Measures the size of the text within the Button elements Measures the size of the Button elements
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Figure 28: Layout Example
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Sizes the Button elements based on the size of the Silverlight plug-in display area and the contained text Positions the Button elements so that they stack vertically 7, Layout, discusses the layout system in detail
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Rendering After Silverlight has downloaded an application, parsed the XAML, executed startup code, and run layout to position and size elements, it is ready to render them to the screen Silverlight includes its own rendering system rather than using the one available on the target operating system The Silverlight rendering system gives consistent visual quality and performance independent of operating system and browser It also supports more advanced rendering features than are available in HTML such as anti-aliased vector graphics primitives, video, effects, 3D, and other features not possible in all Web browser HTML implementations 3 discusses the Silverlight rendering system in detail
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This chapter described the following: The Silverlight application principles The components to a Silverlight XAP An introduction to XAML How to integrate code with your display XAML What the Silverlight runtime does under the hood to run a Silverlight application Upcoming chapters will discuss the principles, basic function, and the under the hood workings of the following: Graphics Text
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you will learn how to add rich vector graphics and images to your application You will also learn how to optimize performance and image quality of those graphics elements In particular, 3 will discuss the following: The graphics system design principles The elements for displaying graphics The problems the Silverlight runtime solves under the hood and the problems your application must solve
N THIS CHAPTER,
Graphics Principles
The Silverlight graphics API makes it easy to add vector graphics, bitmap images, and text to your applications This section describes the graphics API design principles
Vector Graphics and Bitmap Images Bitmap images are a common method of adding graphics to an application However, bitmap images become blurry when scaled up, as shown in Figure 31, or aliased when scaled down, as shown in Figure 32 Unlike a bitmap image, if you scale a vector graphic, it will remain sharp as shown in Figure 33 Both vector graphics and bitmap images are useful in most
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3: Graphics
Figure 31: Scaling up an image of a circle
Figure 32: Scaling down an image of a circle
Figure 33: Scaling a vector graphic circle
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Graphics Principle s
applications For example, a user interface control looks better at different sizes and resolutions with vector graphics instead of bitmap images Bitmap images are useful for displaying content that is not easily expressible in vector form such as digital photographs or visual effects not supported by the runtime
New in Silverlight 3
There are a number of techniques for scaling down an image to produce a result better than that shown in Figure 32 Silverlight 3 converts your bitmap to a set of smaller images at various sizes using a better algorithm This conversion happens once per bitmap and Silverlight caches the result of the conversion for the lifetime of your bitmap During an animation, Silverlight 3 dynamically selects the right resolution bitmap to display This process can increase memory usage by 33%, but substantially improves the display quality of scaled down images and 3D transforms to get a result close to that shown in Figure 33 When scaling up bitmaps in Silverlight 3, the image remains blurry as shown in Figure 31
Retained Mode There are two types of graphics API: retained mode and immediate mode A retained mode API automatically responds to changes to a graph of objects An immediate mode API requires you to issue all the draw commands to describe a change For example, to remove the rectangle shown in Figure 34 in a retained mode system, simply call a function to remove that element The retained mode graphics system is responsible for redrawing the background, the triangle beneath, and the ellipse above To remove the same rectangle shown in Figure 34 with an immediate mode API, you need to make three calls to draw the background, the triangle beneath it, and the ellipse above as shown in Figure 35