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Introduction to Silverlight Animation
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The term animation usually brings to mind cartoons or animated features like those that Disney has brought to life on the big screen. Artists create a number of images with slight variations that, when shown in rapid sequence, appear as fluid movement. Fundamental to any type of animation is the changing of some attribute of an object over time. For Silverlight, the implementation of an animation is very straightforward. You change a property of an object gradually over time, such that you have the appearance of that object moving smoothly from one point to the next. As an example, Figure 13-1 shows an icon bar that I created for one of my Silverlight applications. As your mouse rolls over an icon in the bar, the icon grows; as the mouse leaves the icon, it shrinks back to its initial size. When you click one of the icons, the icon bounces, just as it does on the Mac OS X Dock.
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CHAPTER 13 TRANSFORMATIONS AND ANIMATION
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Figure 13-1. An animated application bar created with Silverlight In the example in Figure 13-1, for one of the icons, the animation that was created when the mouse was placed over the icon had two basic positions: at timestamp 0.00, the icon s Width and Height properties were set to 50 pixels; at timestamp 0.25, the Width and Height properties were set to 75 pixels. To make the transition smooth from timestamp 0.00 to 0.25, Silverlight creates a spline, which will generate all of the frames along the way to make the movement appear fluid to the human eye.
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Silverlight Storyboards
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In movies or cartoon animations, a storyboard is a sequence of sketches that depict changes of action over the duration of the film or cartoon. So, essentially, a storyboard is a timeline. In the same way, storyboards in Silverlight are timelines. As an example, Figure 13-2 shows a storyboard for an application that animates the transformation of a circle and two rectangles.
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Figure 13-2. Example of a storyboard In the storyboard in Figure 13-2, three objects are represented: a circle, a small rectangle, and a large rectangle. At the start of the storyboard s timeline, all three objects are on the left side of the document. After 2 seconds, the circle and smaller rectangle start to move toward the right side of the document. The larger rectangle starts to change its background from white to black. At 4 seconds into the timeline, the circle and the smaller rectangle will have reached the right side of the document. At that time, the smaller rectangle will begin to turn into a square. At 8 seconds, the smaller rectangle will have turned into a square, and the larger rectangle will have turned fully black.
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CHAPTER 13 TRANSFORMATIONS AND ANIMATION
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If you translate this storyboard into Silverlight animations, you will have four animations: Two animations that will cause the circle and the smaller square to move from the left to the right side of the document. An animation that will change the background of the larger rectangle from white to black. An animation to change the smaller rectangle into a square.
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Next, you will look at the different types of animations in Silverlight.
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Types of Animations in Silverlight
There are two basic types of animations in Silverlight: Linear interpolation animation: This type of animation smoothly and continuously varies property values over time. Keyframe animation: With this type of animation, values change based on keyframes that have been added to a given point in the timeline. Most commonly, keyframe animations are used in conjunction with a form of interpolation to smooth animations. All types of animation in Silverlight are derived from the Timeline class found in the System.Windows.Media.Animation namespace. The following types of animations are available: ColorAnimation ColorAnimationUsingKeyFrames DoubleAnimation DoubleAnimationUsingKeyFrames ObjectAnimationUsingKeyFrames PointAnimation PointAnimationUsingKeyFrames
Each of these animates a different type of object. For example, ColorAnimation animates the value of a Color property between two target values. Similarly, DoubleAnimation animates the value of a Double property, PointAnimation animates the value of a Point property, and ObjectAnimation animates the value of an Object property. Developers determine which animation type to use based on what they want to animate. As an example, let s look at a very simple animation where you will increase the size of a rectangle over time, as shown in Figure 13-3. This example will allow us to dissect some of the properties involved with the animation.
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