Coding4Fun

Adding the Blind Scientist Behaviors

Before we define the behaviors for the Blind Scientist, we should spend a little bit of time explaining the XAML that defines the Blind Scientist actor. Inside the Blind Scientist's XAML definition is a Silverlight Storyboard (a time-based animation) that will grow the Blind Scientist in size by 400%. We want to create a behavior that will run the Storyboard animation when our Main actor first collides with the Blind Scientist. Because we don't want the Blind Scientist to grow 400% for every collision with the Main actor, we'll also use a custom property, isHit, as a Boolean field to see whether the growth animation has already executed.

Adding a Custom Code Behavior to Call the Grow Animation Storyboard

To begin, create a new custom code behavior for the Blind Scientist actor and rename the behavior to "RunGrowStoryBoard". Set the event that will run this behavior to be a collision event between the Blind Scientist and the Main actor, as shown in Figure 2-70.

Figure 2-70. The collision event to run the custom code behavior

Next, click the Filter button for the "RunGrowStoryBoard" behavior, as shown in Figure 2-71.

Figure 2-71. Adding a filter to an event's behavior

As we explained earlier, a behavior filter lets you filter events so that the behavior ...