.NET/Java PDF, Tiff, Barcode SDK Library

let movingShape initPos draw = let currPos = ref initPos in { reposition = (fun newPos -> currPos := newPos); draw = (fun g -> draw !currPos g); } let movingCircle initPos diam = movingShape initPos (fun pos g -> g.DrawEllipse(Pens.Blue,pos.X,pos.Y,diam,diam)) let movingSquare initPos size = movingShape initPos (fun pos g -> g.DrawRectangle(Pens.Blue,pos.X,pos.Y,size,size) ) let fixedShape draw = { reposition = (fun newPos draw = (fun g

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Figure 14-32. Inexpensive digital camera fitted to the vehicle Both the second generation NXT-G environment and BricxCC have built-in remote control windows that give you joystick-like control of the vehicle. Dashboard Designer from RoboDNA and NXTRemote from Anders S borg are also suitable programs for remote control. Arrange the live video and the remote control windows to be side by side, as in Figure 14-33, and then try driving while only looking at the video screen as a true remotely guided vehicle. When you see something interesting, you can take a picture of it by pressing the Capture button.

-> ()); -> draw g); }

even escape the data for you All you need to worry about is telling Taconite what values should be sent to the server, and it takes care of the rest Since all the JavaScript is created by the parser based on the HTML you specify, you don t have to worry about dealing with browser JavaScript incompatibilities The parser takes care of them for you Did you catch that Taconite takes care of the incompatibilities Seriously, you don t have to worry about it; we ve done that for you All you need to do is specify the dynamic content as HTML within a JSP and the parser does the rest.

let fixedCircle (pos:Point) (diam:int) = fixedShape (fun g -> g.DrawEllipse(Pens.Blue,pos.X,pos.Y,diam,diam)) let fixedSquare (pos:Point) (size:int) = fixedShape (fun g -> g.DrawRectangle(Pens.Blue,pos.X,pos.Y,size,size)) let point (x,y) = new Point(x,y) let shapes = [ movingCircle (point (10,10)) 20; movingSquare (point (30,30)) 20; fixedCircle (point (20,20)) 20; fixedSquare (point (40,40)) 20; ] let mainForm = let form = new Form() let rand = new Random() form.Paint.Add(fun e -> shapes |> List.iter (fun s -> s.draw e.Graphics) )

Figure 14-33. Live Video and BricxCC Joystick Tool Usually both the NXT-G environment and BricxCC do a good job of automatically finding the NXT and making a Bluetooth connection for wireless control. The process is called pairing, but unfortunately it doesn t always seem to work. Sometimes it helps to establish the Bluetooth connection another way, and we ll go through that process step by step. Start by opening the Windows Control Panel and doubleclicking the Bluetooth Devices icon, as shown in Figure 14-34.

form.Click.Add(fun e -> shapes |> List.iter (fun s -> s.reposition(new Point(rand.Next(form.Width), rand.Next(form.Height))); form.Invalidate()) ) form [<STAThread>] do Application.Run(mainForm) Again, you define a Shape record type that has the members reposition and draw. Then you define the functions makeCircle and makeSquare to create different kinds of shapes and use them to define a list of shape records. Finally, you define the form that will hold your records. Here you must do a bit more work than perhaps you would like. Since you don t use inheritance, the BCL s System.Winows.Forms.Form doesn t know anything about your shape objects, and you must iterate though the list, explicitly drawing each shape. This is actually quite simple to do and takes just three lines of code where you add an event handler to mainForm s Paint event: temp.Paint.Add( fun e -> List.iter (fun s -> s.draw e.Graphics) shapes); This example shows how you can quickly create multifunctional records without having to worry about any unwanted features you might also be inheriting. In the next section, you ll look at how you can represent operations on these objects in a more natural way: by adding members to F# types.

, The beauty of Taconite s design is that it encourages you to keep all your business logic on the server side (where, frankly, it is a lot easier to write) while the browser does what it does best: it renders a user interface Taconite trivializes the task of making Ajax requests from the browser to the server so you can reuse domain logic with ease Of course, removing redundancy is not the only reason you should avoid business logic in the browser Hosting domain logic on the client can open security vulnerabilities.