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As you learned earlier in this chapter, WPF attempts to keep animations running at 60 frames per second. This ensures smooth, fluid animations from start to finish. Of course, WPF might not be able to deliver on its intentions. If you have multiple complex animations running at once and the CPU or video

To create the SendEmail activity, follow these steps: 1. Right-click the project, and select Add New File. 2. Select Activity, and name the activity SendEmail. 3. View the code for the activity, and populate it with the following code: using using using using using using using System; System.ComponentModel; System.ComponentModel.Design; System.Collections; System.Drawing; System.Workflow.ComponentModel; System.Workflow.ComponentModel.Design;

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card can t keep up, the overall frame rate may drop (in the best-case scenario), or it may jump to catch up (in the worst-case scenario). Although it s rare to increase the frame rate, you may choose to decrease the frame rate. You might take this step for one of two reasons: x x Your animation looks good at a lower frame rate, so you don t want to waste the extra CPU cycles. Your application is running on a less powerful CPU or video card, and you know your complete animation won t be rendered as well at a high frame rate as it would at a lower rate.

Summary

Note Developers sometimes assume that WPF includes code that scales the frame rate down based on the

video card hardware. It does not. Instead, WPF always attempts 60 frames per second, unless you tell it otherwise. To evaluate how your animations are performing and whether WPF is able to achieve 60 frames per second on a specific computer, you can use the Perforator tool, which is included as part of the Microsoft Windows SDK v7.0. For a download link, installation instructions, and documentation, see http://tinyurl.com/yfqottg.

Adjusting the frame rate is easy. You simply use the Timeline.DesiredFrameRate attached property on the storyboard that contains your animations. Here s an example that halves the frame rate: <Storyboard Timeline.DesiredFrameRate="30"> Figure 15-9 shows a simple test application that animates a circle so that it arcs across a Canvas.

System.Workflow.ComponentModel.Compiler; System.Workflow.ComponentModel.Serialization; System.Workflow.Runtime; System.Workflow.Activities; System.Workflow.Activities.Rules; System.Net.Mail; System.Net.Security; System.Collections.Generic; System.Net;

The application begins with an Ellipse object in a Canvas The CanvasClipToBounds property is set to true so the edges of the circle won t leak over the edge of the Canvas into the rest of the window <Canvas ClipToBounds="True"> <Ellipse Name="ellipse" Fill="Red" Width="10" Height="10"></Ellipse> </Canvas> To move the circle across the Canvas, two animations take place at once one that updates the CanvasLeft property (moving it from left to right) and one that changes the CanvasTop property (causing it to rise up and then fall back down) The CanvasTop animation is reversible once the circle reaches its highest point, it falls back down The CanvasLeft animation is not, but it takes twice as long, so both animations move the circle simultaneously The final trick is using the DecelerationRatio property on the CanvasTop animation.

That way, the circle rises more slowly as it reaches the summit, which creates a more realistic effect Here s the complete markup for the animation: <WindowResources> <BeginStoryboard x:Key="beginStoryboard"> <Storyboard TimelineDesiredFrameRate= "{Binding ElementName=txtFrameRate,Path=Text}"> <DoubleAnimation StoryboardTargetName="ellipse" StoryboardTargetProperty="(CanvasLeft)" From="0" To="300" Duration="0:0:5"> </DoubleAnimation> <DoubleAnimation StoryboardTargetName="ellipse" StoryboardTargetProperty="(CanvasTop)" From="300" To="0" AutoReverse="True" Duration="0:0:25" DecelerationRatio="1"> </DoubleAnimation> </Storyboard> </BeginStoryboard> </WindowResources> Notice that the CanvasLeft and CanvasTop properties are wrapped in brackets this indicates that they aren t found on the target element (the ellipse) but are attached properties You ll also see that the animation is defined in the Resources collection for the window This allows the animation to be started in more than one way In this example, the animation is started when the Repeat button is clicked and when the window is first loaded, using code like this: <WindowTriggers> <EventTrigger RoutedEvent="WindowLoaded"> <EventTrigger.

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