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A container is an object that holds a collection of interface child components and provides services to those Sys.IContainer +addComponent() components. Typically, a container exposes meth+removeComponent() ods for adding, removing, and accessing the child +findComponent () components. The Microsoft Ajax Library defines +getComponents() the Sys.IContainer interface for implementing containers. The methods exposed by this interface Sys._Application are shown in figure 8.3. Figure 8.3 shows that the Sys._Application class, the single instance of which is the Application object, is a container. One of the goals of the Figure 8.3 Methods defined by Application object is to host and keep track of the the Sys.IContainer interface. The Sys._Application class is client components instantiated in the page. As an example of a client class that is you ll discover in the following sections, hosting cli- a container. ent components in a container has various advantages. For example, you can retrieve references to client components through the container, instead of storing them in global JavaScript variables. Another benefit of hosting components in the Application object is that they re automatically disposed by the container when the page is unloaded by the browser. This means you don t have to manually call the dispose method on each component instance. Client components become children of the Application object during their creation process, which is illustrated in section 8.2.1.

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If both wheels are pointing in the same direction (forward or reverse), we drive (or reverse) in the direction we are pointing. If they are driving in opposite directions, we rotate about our center. If both are stopped, we will remain stationary. Example 6-3 shows the implementations of Drive and Rotate. They use a little bit of trigonometry to get the job done.

private void Rotate(double duration) { // This is the total circumference of turning circle double circum = Math.PI * PlatformWidth; // This is the total distance traveled double d = duration * MotorSpeed; if (LeftMotorState == MotorState.Reversed) { // And we're going backwards if the motors are reversed d *= -1.0; } // So we've driven it this proportion of the way round double proportionOfWholeCircle = d / circum; // Once round is 360 degrees (or 2pi radians), so we have traveled // this far: CurrentOrientation = CurrentOrientation + (Math.PI * 2.0 * proportionOfWholeCircle); } private void Drive(double duration) { // This is the total distance traveled double d = duration * MotorSpeed; if (LeftMotorState == MotorState.Reversed) { // And we're going backwards if the motors are reversed d *= -1.0;

Property accessors have predefined names and semantics. They are the set accessor and the get accessor. You can think of the set accessor as a method with a single parameter that sets the value of the property. The get accessor has no parameters and returns a value from the property. The set accessor always has the following: A single, implicit value parameter named value, of the same type as the property A return type of void The get accessor always has the following: No parameters A return type of the same type as the property The structure of a property declaration is shown in Figure 6-8. Notice in the figure that neither accessor declaration has explicit parameter or return type declarations. They don t need them, because they are implicit in the type of the property.

} // Bit of trigonometry for the change in the x,y coordinates double deltaX = d * Math.Sin(CurrentOrientation); double deltaY = d * Math.Cos(CurrentOrientation); // And update the position CurrentPosition = new Point(CurrentPosition.X + deltaX, CurrentPosition.Y + deltaY);

}

Let s write a quick test program to see whether the code we ve written actually does what we expect (see Example 6-4).

static void Main(string[] args) { // Here's our turtle Turtle arthurTheTurtle = new Turtle {PlatformWidth = 10.0, PlatformHeight = 10.0, MotorSpeed = 5.0}; ShowPosition(arthurTheTurtle); // We want to proceed forwards arthurTheTurtle.LeftMotorState = MotorState.Running; arthurTheTurtle.RightMotorState = MotorState.Running; // For two seconds arthurTheTurtle.RunFor(2.0); ShowPosition(arthurTheTurtle); // Now, let's rotate clockwise for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; // PI / 2 seconds should do the trick arthurTheTurtle.RunFor(Math.PI / 2.0); ShowPosition(arthurTheTurtle); // And let's go into reverse arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; // And run for 5 seconds arthurTheTurtle.RunFor(5); ShowPosition(arthurTheTurtle); // Then rotate back the other way arthurTheTurtle.RightMotorState = MotorState.Running; // And run for PI/4 seconds to give us 45 degrees arthurTheTurtle.RunFor(Math.PI / 4.0); ShowPosition(arthurTheTurtle);

Figure 6-8. The syntax and structure of a property declaration The implicit parameter value, in the set accessor, is a normal value parameter. Like other value parameters, you can use it to send data into a method body or in this case, the accessor block. Once inside the block, you can use value like a normal variable, including assigning values to it. Other important points about accessors are the following: All paths through the implementation of a get accessor must include a return statement that returns a value of the property type. The set and get accessors can be declared in either order, and no methods other than the accessors are allowed on a property.

// And finally drive backwards for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; arthurTheTurtle.RunFor(Math.Cos(Math.PI / 4.0)); ShowPosition(arthurTheTurtle); Console.ReadKey(); } private static void ShowPosition(Turtle arthurTheTurtle) { Console.WriteLine( "Arthur is at ({0}) and is pointing at angle {1:0.00} radians.", arthurTheTurtle.CurrentPosition, arthurTheTurtle.CurrentOrientation); }

Figure 8.4 Client page lifecycle and component s internal lifecycle: client components are hosted by the Application object during their creation and are automatically disposed when the page is unloaded by the browser.

We chose the times for which to run quite carefully so that we end up going through relatively readable distances and angles. (Hey, someone could design a more usable facade over this API!) If we compile and run, we see the following output:

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