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let iterations = 18 let isInMandelbrotSet c0 = let rec check n c = (n = iterations) || (cMin < c) && (c < cMax) && check (n + 1) ((c * c) + c0) check 0 c0 let scalingFactor = 1.0 / 200.0 let offset = -1.0 let mapPlane (x, y) = let fx = ((float x) * scalingFactor) + offset let fy = ((float y) * scalingFactor) + offset complex fx fy let form = let image = new Bitmap(400, 400) for x = 0 to image.Width - 1 do for y = 0 to image.Height - 1 do let isMember = isInMandelbrotSet ( mapPlane (x, y) ) if isMember then image.SetPixel(x,y, Color.Black) let temp = new Form() in temp.Paint.Add(fun e -> e.Graphics.DrawImage(image, 0, 0)) temp [<STAThread>] do Application.Run(form)

Everything in the indented code block after the class statement is the class definition. This is where we set up the properties used to describe the object and supply all the methods that it will need. In Python, properties are simply variables stored within the object, and methods are functions that work with the object. In our Tank class, there is an oddly named method called __init__, which has special meaning to Python. When you create an object, Python calls this method automatically. It is typically used by Python programmers to assign properties to the object, but you can do anything else that may be needed when the object is first created. This __init__ method takes two parameters: self and name. Because methods are potentially used for many objects, we need some way to know which object we are using. This is where self comes in it is a reference to the current object that Python supplies automatically to all method calls. The second parameter (name) is a string we will use to tell one tank from another, because there will be more than one.

SharpDevelop is an open-source IDE with F# bindings that can be used for .NET and Mono development. The F# bindings are packaged with SharpDevelop, so to use them all you need to do is ensure that F# is installed then install SharpDevelop. After that it s just a matter of creating a new F# project and off you go. The F# bindings for SharpDevelop do not offer as much functionality as Visual Studio does only syntax highlighting and F# interactive are available. However, the development environment is still very useable, and the bindings are open source. So if you wish to extend them, you can help out with the project. Figure 2-4 shows SharpDevelop with an F# project open.

team is the right thing to do, as the customer will usually resist such a request. Your team will need to describe the benefits to the customer. These benefits should include the customer s ability to make changes throughout the development process, to receive rapid feedback as to what is going on with the project, and to make better decisions concerning the project. If you are unsuccessful in convincing your customers that they need to sit with you, you will have a difficult time working effectively as an XP team.

The code in __init__ first copies the name parameter to a property so we can retrieve it later; it then assigns a few other properties we will need. We don t require a great deal of information for the tank in the game I have planned; we just need to know if the tank is alive (self.alive), how much ammo it has (self.ammo), and how much armor it has remaining (self.armor).

HOW TO OBTAIN, INSTALL, AND USE F#

Visual Studio 2005 adds a new XP feature directly in the IDE. You now have several refactoring tools at your disposal. The following refactoring tools are available via the Refactor menu on the menu bar and also on the context menu when you right-click a class, interface, method, or variable name in your source code: Extract Method Rename Encapsulate Field Extract Interface Promote Local Variable to Parameter Remove Parameters Reorder Parameters Each of the refactoring tools is described in the following sections.

If you prefer, you can type your programs into the F# interactive console directly when it s running in stand-alone mode, as shown in Figure 2-5.

Note You don t have to call the first parameter self. You could name it anything you want, but it is a good

HOW TO OBTAIN, INSTALL, AND USE F#

idea to stick to self so you will know exactly what it is for when you read over your code. Python programmers tend to stick to this convention, so there is no confusion when exchanging code.