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Figure 6-2. The explosions are made up of little rotating squares of different colors. The explosion is a single, self-contained sprite that s superimposed over the background. The sprite creates 100 little squares internally; gives them random velocity, rotation, and fade rates; and makes them move. It s all done by the Explosion class, which you ll find in the com.friendsofed.gameElements.effects package. There s one very important new technique that the Explosion class uses. Instead of updating the positions of the particles each frame, it updates their positions using a timer.

As an example of implicit data binding, you will be using an implicit getter and setter. You will create a class that holds a variable. Once that variable is changed, you will get a notification, which will allow you to make changes in your application. The example is simple in nature so it will be clear for you to understand how to create an implicit data binding. First, create a new class and call it ClassA. Create the setter and getter and add the [Bindable] tag. The [Bindable] metadata tag is compiled as [Bindable(event="propertyChange")]. The setter dispatches an event that will be added automatically. Although the event string gets set to propertyChange automatically, once you leave it empty you can change it. The mxmlc compiler creates additional code when you don t specify the event string, so it s recommended to add your own name to avoid that.

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The client-side sink extends BaseChannelSinkWithProperties and implements IClientChannelSink. In Listing 13-1, you can see a skeleton client channel sink. The positions at which you ll have to implement the preprocessing and post-processing logic have been marked TODO. This is a fully working sink it simply doesn t do anything useful yet. Listing 13-1. A Skeleton IClientChannelSink using using using using System; System.Runtime.Remoting.Channels; System.Runtime.Remoting.Messaging; System.IO;

A particle explosion creates a lot of moving objects on the stage. Whenever many things start moving around quickly in your games, you need to start thinking about optimization. Explosion effects using a few hundred particles will start to put a strain on the CPU, and your game will slow down, stutter, and crawl. Even in this simple example, if you fire off five or ten bullets at time, you ll probably notice a drop in the frame rate. One widely used optimization technique is to run less important animations at frame rates that are slower than the rest of the game. Players really notice only the frame rates of objects that they re directly interacting with: the player s character, enemies, and bullets. Those need to run at the highest possible frame rates for the players to feel immersed in the game. But players don t notice the frame rates of background objects or little extras, like explosions. If you can update those nonessential animations at low frame rate, you have much more juice left over for the main action. This can give your game a big performance saving. This is also a very simple solution to put into place. All it amounts to is this: Update the object positions with a TIMER instead of an ENTER_FRAME event. There are no other changes you ll need to make to the code and, except for one important difference, the animation effect on the stage will be identical.

package { import mx.core.UIComponent; public class ClassA extends UIComponent { private var _value:Number; [Bindable] public function get value():Number { return _value; } public function set value(num:Number):void { _value = num; } } }

namespace CompressionSink { public class CompressionClientSink: BaseChannelSinkWithProperties, IClientChannelSink { private IClientChannelSink _nextSink; public CompressionClientSink(IClientChannelSink next) { _nextSink = next; } public IClientChannelSink NextChannelSink { get { return _nextSink; } }

The difference is that if you use a timer event, the objects will still continue to be animated at a constant rate, even if the game s frame rate drops Timer events run independently from the SWF s frame rate, so they re not affected by a drop in the frame rate If the frame rate does drop, the objects will calculate their new positions as if the game were running at full speed The result on stage is that objects will essentially skip over the frames they ve missed and jump to their new positions This isn t usually a desirable effect for the main objects in the game, like the player s character, because players will suddenly see their character jump to a new position.

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