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CHAPTER 13 TRANSFORMATIONS AND ANIMATION
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private bool Paused; public Page() { // Required to initialize variables InitializeComponent(); this.btnStart.Click += new RoutedEventHandler(btnStart_Click); this.btnStop.Click += new RoutedEventHandler(btnStop_Click); this.rectangle.MouseLeftButtonUp += new MouseButtonEventHandler(rectangle_MouseLeftButtonUp); } void rectangle_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { if (Paused) { this.MoveRect.Resume(); Paused = false; } else { this.MoveRect.Pause(); Paused = true; } } void btnStop_Click(object sender, RoutedEventArgs e) { this.MoveRect.Stop(); } void btnStart_Click(object sender, RoutedEventArgs e) { this.MoveRect.Begin(); } That s all there is to it! So far in this chapter, you have looked at some very simple animations. Of course, in reality, animations can get much more complex. One of the key advantages you have as a developer is that there are tools to assist you with these animations. Expression Blend is the tool to use when designing your Silverlight animations.
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Using Expression Blend to Create Animations
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Although you can use Visual Studio 2008 to create your animations in Silverlight, Visual Studio does not include designer tools to assist you. If you are going to build animations programmatically, Visual Studio is the way to go. But if you are creating your animations in design mode, Expression Blend has the tools that allow you to do this easily.
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CHAPTER 13 TRANSFORMATIONS AND ANIMATION
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Viewing a Storyboard in the Expression Blend Timeline
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The primary asset within Expression Blend for animations is the Objects and Timeline panel. Up to this point, you have focused on the object side of the Objects and Timeline panel. With animations, it is all about the timeline. With a storyboard selected, the timeline appears, as shown in Figure 13-5.
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Figure 13-5. Expression Blend s timeline for a storyboard The timeline in Figure 13-5 is actually the implemented timeline for the storyboard shown earlier in Figure 13-2. The three objects in the storyboard are listed in the Objects and Timeline panel. To the right of each of these objects, you see the timeline with just over 10 seconds showing horizontally. At time zero, there are three keyframes added, indicating that some animation action is taking place at that time. Then, at 4 seconds into the timeline, you see two keyframes providing the end point of the circle and smaller rectangle s movement from left to right. At 8 seconds through the timeline, there are two final keyframes: one providing an end point for the smaller rectangle turning into a square and one changing the larger rectangle to black. To better understand how Expression Blend can help you build your animations, let s run through an exercise.
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Try It Out: Creating an Animation with Expression Blend
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In this exercise, you ll create the classic bouncing ball animation using Expression Blend. You ll create an animation that will make a red ball drop and bounce on a black rectangle until it comes to rest. You ll start off with a very simple animation, and then add to it to make it progressively more realistic. 1. 2. Create a new Silverlight application in Expression Blend named Ch13_BlendAnimations. Add an Ellipse control with red fill and a black border near the top center of the grid. Next, add a Rectangle control to the very bottom of the grid and have it stretch all the way from left to right. Set the fill color and border color to black. Your application should appear similar to Figure 13-6.
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CHAPTER 13 TRANSFORMATIONS AND ANIMATION
Figure 13-6. Initial application layout 3. The first step in creating an animation is to create a new storyboard. On the Objects and Timeline panel, click the button with the plus sign, to the right of the text (No Storyboard open), as shown in Figure 13-7. This opens the Create Storyboard Resource dialog box.
Figure 13-7. Click the plus button to create a new storyboard.
CHAPTER 13 TRANSFORMATIONS AND ANIMATION
In the Create Storyboard Resource dialog box, enter BounceBall in the Name (Key) text box, as shown in Figure 13-8. This will be the name of your storyboard.
Figure 13-8. Name your storyboard in the Create Storyboard Resource dialog box. 5. When the storyboard is created, the timeline will be visible on the right side of the Objects and Timeline panel. To better see this, switch to the Animation workspace in Expression Blend by selecting Window Active Workspace Animation Workspace. Your workspace should now look similar to Figure 13-9.
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