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Matrix3dProjection is something you may only ever use once but, for that one time,
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it ll be exactly what you need to solve a specific problem. The sky s the limit when it comes to 3D transformations (actually 2.5D because Silverlight doesn t yet have a true 3D engine) for your Silverlight applications. One thing you may have noticed with the projection transforms is that they add some fuzziness to the elements when they render. That s because the render transforms operate on frame-by-frame bitmap representations of the objects. That makes them extremely performant, but also causes them to have a slight degradation in quality, especially when you do something such as an extreme z scale, as in the Matrix3dProjection example. Silverlight provides two easy-to-use but powerful ways to transform objects in 3D space: PlaneProjection and Matrix3dProjection. PlaneProjection, in particular, will find its way into a lot of your applications. In fact, if you develop for Silverlight for the Windows Phone, you ll find the PlaneProjection indispensible for providing the expected page flip UI transitions. In the last two examples, I used a combination of Grids and StackPanels to hold the elements I was transforming. Both of these are types of Panels and will be something you use over and over again in your own applications.
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The basis for all onscreen elements is the FrameworkElement and UIElement pair. The two of them define the majority of the commonly used properties and methods for other elements. In addition, they define the abstract methods for measuring and layout, the core of the layout system. Framework elements, UI elements, and panels are the fundamental players in the layout system. Layout in Silverlight is so flexible because so much of the measurement and layout are delegated to the elements themselves. An understanding of the layout system is important for both performance and flexibility reasons and is a must should you wish to create your own panels. The layout system is a major part of a much larger rendering system. The rendering system in Silverlight does a good job at optimizing the elements onscreen for efficient rendering, but also provides appropriate places where you can tune that process to fit your own applications. Silverlight enables you to cache elements, for example, and even to control whether cached elements are cached to hardware surfaces on a compatible video card. Render transformations allow us to transform the location, rotation, skew, or size of any visible element without incurring the performance hit of a layout system pass. For that reason, they re perfectly suited to animation and more performance-hungry uses. What render transformations lack is support for nonaffine or perspective transforms. The two types of 3D projections pick up where render transforms leave off, and provide support for nonaffine, perspective, and distorting 3D transformations. The PlaneProjection is the easiest to use and suitable for most types of basic projection
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work. The Matrix3dProjection is a little harder to use but is extremely powerful. If you want to do basic CoverFlow-style work, PlaneProjection is for you. If you want to do a more immersive 3D experience with floating panels zipping past you and appearing off in the distance, you re probably looking at the Matrix3dProjection class and some of its helper libraries on www.codeplex.com. With framework and UI elements, the rendering and layout system, transformations, and projections under our belt, we re ready to move on to the fundamentals of working with layout panels. Panels form the root elements for most of our interfaces and are the main elements responsible for layout in Silverlight.
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Panels
This chapter covers
Absolute layout with the Canvas Stacking items with the StackPanel Cell-based layout with the Grid
Panels in Silverlight provide a way to host multiple elements and provide unique layout logic. For example, you may want a panel that lays out elements so they appear to radiate out of a central point (think of the wheel on Wheel of Fortune). Rather than provide each and every control with the knowledge required to perform that layout, Silverlight leaves it to the panel. This delegation to panels and the layout system is why you won t see Left and Top properties on UI elements those properties are provided by the panels in the form of attached properties (see section 2.1.5 for more information on attached properties). In typical use, any control you place in the UI in Silverlight is going to be hosted in a panel at some level. Understanding how the different panels work is essential to making the most of Silverlight s UI capabilities. Though there are numerous types of panels available, the three most important and widely used are the Canvas, the StackPanel, and the Grid.
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