barcode generator source code in c#.net Move the playhead (the yellow vertical line on the timeline with the down arrow at in Font

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7. Move the playhead (the yellow vertical line on the timeline with the down arrow at
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the top), to position 3 (3 seconds), as shown in Figure 10-10.
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Figure 10-10. Moving the playhead on the timeline
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8. With the playhead at 3 seconds, select the ellipse and move it down so that it is
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positioned directly below its starting point, but touching the black rectangle, as shown in Figure 10-11.
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Figure 10-11. Repositioned ball on our grid
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CHAPTER 10 TRANSFORMATIONS AND ANIMATION
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If you look carefully at the timeline, you ll notice that a red circle has shown up to the left of the Ellipse control in the Objects and Timeline panel, with a white arrow indicating that the object contains an animation. In addition, in the timeline, at position 3 seconds, a white ellipse has appeared to the right of the Ellipse control. This is how Expression Blend visually represents a keyframe. At the top of the timeline, you will see buttons for navigating forward and backward between the frames in the animation. In addition, there is a play button that lets you view the animation.
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9. Click the play button to view the animation. If you followed the steps properly, you
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will see the ball start at the top of the grid and slowly move to the top of the rectangle. You just created your first animation! However, it isn t very realistic. In a real environment, the ball would accelerate as it fell toward the rectangle. So its movement would start out slow and speed up. You can mimic this behavior by modifying your keyframe and adding a spline.
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10. Select the newly added keyframe in the timeline. (When the keyframe is selected, it
will turn gray instead of white). Once the keyframe is selected, in the Properties panel, you will see a section titled Easing. This section allows you to adjust the KeySpline property. By default, the interpolation between the two keyframes is linear. However, for this example, you want to speed up the ball as it gets closer to the second keyframe.
11. Click and drag the dot in the upper-right corner of the KeySpline grid (the end point
of the right side of the line), and drag it down so it appears as shown in Figure 10-12.
12. Click the play button at the top of the timeline. This time, you will see that the circle
starts to drop slowly and then speeds up the closer it gets to the rectangle. This makes for a much more realistic animation.
13. Next, the circle is going to bounce back up after impacting the rectangle. With
recording still on, move the playhead to 6 seconds on the timeline, and then move the circle directly up from its current position to about three-fourths its initial starting point.
14. Select the new keyframe that is created, and navigate to the Easing section of the
Properties panel. This time, you want the movement to start out fast and slow down as the circle reaches its apex. To get this effect, move the bottom-left dot up so the KeySpline curve appears as shown in Figure 10-13.
CHAPTER 10 TRANSFORMATIONS AND ANIMATION
Figure 10-12. Adjusting the KeySpline property for the ball dropping
Figure 10-13. Adjusting the KeySpline property for the ball rising
15. Click the play button above the timeline to see the animation you have so far. The
circle will fall with increasing speed, and then bounce back up with decreasing speed. So far so good, but what goes up, must come down.
CHAPTER 10 TRANSFORMATIONS AND ANIMATION
16. Move the playhead to 8 seconds, and move the circle up about one-fourth its initial position and adjust the KeySpline property to match Figure 10-12. Sticking with the
pattern, move the playhead to 10 seconds, and move the circle down to the top of the rectangle. The KeySpline curve should match Figure 10-13. Repeat this pattern at 11 seconds, and then 11.5 seconds.
17. Click the play button. You should see the circle bounce on the rectangle as you
would expect. The final timeline will appear as shown in Figure 10-14.
Figure 10-14. Final timeline for bouncing ball
Next, you need to tell Silverlight when the animation should take place. We will keep it simple and have the animation start when the page is loaded.
18. Navigate to the code behind for the Page.xaml file. In the Page() constructor, add the event handler for the Loaded event, as follows: public Page() { // Required to initialize variables InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { this.BounceBall.Begin(); } 19. Run the application. At this point, you should see the ball bounce on the rectangle.
You might see something like what is shown in Figure 10-15.
CHAPTER 10 TRANSFORMATIONS AND ANIMATION
Figure 10-15. Finished bouncing ball animation application
In this section, we discussed animations in Silverlight 2. You should be comfortable creating new animations for your application in Expression Blend, and modifying and programming against those animations in Visual Studio 2008. The next section addresses transformations in Silverlight 2.
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