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public void UpdatePosition(double minutesToAdvance) { double hours = minutesToAdvance / 60.0; double milesMoved = SpeedInMilesPerHour * hours; double milesToTower = Position.Distance; if (Direction == DirectionOfApproach.Approaching) { milesToTower -= milesMoved; if (milesToTower < 0) { // We've arrived! milesToTower = 0; } } else { milesToTower += milesMoved; } PolarPoint3D newPosition = new PolarPoint3D( milesToTower, Position.Angle, Position.Altitude); }

qDebug() qDebug() qDebug() qDebug() qDebug() qDebug() qDebug() qDebug() }

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This method takes a single argument, indicating how much elapsed time the calculation should take into account. It looks at the speed, the direction, and the current position, and uses this information to calculate the new position.

This code illustrates that our design is some way from being finished. We never change the altitude, which suggests that our planes are going to have a hard time reaching the ground. (Although since this code makes them stop moving when they get directly above the tower, they ll probably reach the ground soon enough...) Apparently our initial specification did not fully and accurately describe the problem our software should be solving. This will not come as astonishing news to anyone who has worked in the software industry. Clearly we need to talk to the client to get clarification, but let s implement what we can for now.

Notice that our code is able to use all of the properties SpeedInMilesPerHour, Direction, and so on without needing to qualify them with a variable. Whereas in Example 3-35 we had to write someBoeing777.SpeedInMilesPerHour, here we just write SpeedInMilesPerHour. Methods are meant to access and modify an object s state, and so you can refer directly to any member of the method s containing class. There s one snag with that. It can mean that for someone reading the code, it s not always instantly obvious when the code uses a local variable or argument, and when it uses some member of the class. Our properties use PascalCasing, while we re using

To get started with JavaScript in Atlas, fire up Visual Studio .NET, and create a new blank Atlas web site by selecting File New Website and then selecting ASP.NET Atlas Web Site from the New Web Site dialog box (see Figure 3-1). When you click OK, Visual Studio .NET will create a new workspace for you that contains everything you need to get started with Atlas. You can see the structure it sets up in Figure 3-2. The template copies the Microsoft.Web.Atlas.dll assembly dependency into your \Bin directory so that your dependencies when running the application will be straight. You ll have to deploy this file with your application if you are moving it to a production server.

"long"; loc.toString( t1, QLocale::LongFormat ); loc.toString( t2, QLocale::LongFormat ); loc.toString( t3, QLocale::LongFormat ); "default"; loc.toString( t1 ); loc.toString( t2 ); loc.toString( t3 );

camelCasing for arguments and variables, which helps, but what it we wanted to access a field Those conventionally use camelCasing too. That s why some developers put an underscore in front of their field names it makes it more obvious when we re doing something with the object s state. But there s an alternative a more explicit style, shown in Example 3-40.

public void UpdatePosition(double minutesToAdvance) { double hours = minutesToAdvance / 60; double milesMoved = this.SpeedInMilesPerHour * hours; double milesToTower = this.Position.Distance; if (this.Direction == DirectionOfApproach.Approaching) { milesToTower -= milesMoved; if (milesToTower < 0) { // We've arrived! milesToTower = 0; } } else { milesToTower += milesMoved; } PolarPoint3D newPosition = new PolarPoint3D( milesToTower, this.Position.Angle, this.Position.Altitude); }

This is almost the same as Example 3-39, except every member access goes through a variable called this. But we ve not defined any such variable where did that come from The UpdatePosition method effectively has an implied extra argument called this, and it s the object on which the method has been invoked. So, if our Main method were to call someBoeing777.UpdatePosition(10), the this variable would refer to whatever object the Main method s someBoeing777 variable referred to. Methods get a this argument by default, but they can opt out, because sometimes it makes sense to write methods that don t apply to any particular object. The Main method of our Program class is one example it has no this argument, because the .NET Framework doesn t presume to create an object; it just calls the method and lets us decide what objects, if any, to create. You can tell a method has no this argument because it will be marked with the static keyword you may recall from 2 that this means the method can be run without needing an instance of its defining type. Aside from our Main method, why might we not want a method to be associated with a particular instance Well, one case comes to mind for our example application.