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The Northwind solution will act as the container of all of the projects. To create your new solution, follow these steps: 1. In Visual Studio, select File New Project. 2. In the Project Types pane, select Other Project Types, and then select Visual Studio Solutions. In the Templates pane, select Blank Solution. 3. Enter Northwind for the solution name. Enter (or browse and select) the location where you would like to save the solution. Your New Project dialog box should look similar to the one shown in Figure A-1. Click the OK button.

// define an organization type type Organization = { chief: string; indians: string list } // create an instance of this type let wayneManor = { chief = "Batman"; indians = ["Robin"; "Alfred"] } // create a modified instance of this type let wayneManor' = { wayneManor with indians = [ "Alfred" ] } // print out the two organizations printfn "wayneManor = %A" wayneManor printfn "wayneManor' = %A" wayneManor'.

Figure 8-7. Field of view Field of view is a better way to define how much perspective there will be in your 3D scene, but we still need a value for d in the perspective projection. To calculate d from the fov, we need to use a little trigonometry. Listing 8-7 is a function that takes the fov plus the screen width, and uses the tan function in the math module to calculate the viewing distance.

Figure A-1. Creating the Northwind solution Your Visual Studio environment should now look similar to Figure A-2. At this point, you have a new solution named Northwind, which can be found in a directory named Northwind, stored in the directory you selected as its location.

The results of this example, when compiled and executed, are as follows: wayneManor = {chief = "Batman"; indians = ["Robin"; "Alfred"];} wayneManor' = {chief = "Batman"; indians = ["Alfred"];} Another way to access the fields in a record is using pattern matching; that is, you can use pattern matching to match fields within the record type As you would expect, the syntax for examining a record using pattern matching is similar to the syntax used to construct it You can compare a field to a constant with field = constant You can assign the values of fields with identifiers with field = identifier You can ignore a field with field = _ The findDavid function in the next example illustrates using pattern matching to access the fields in a record.

Tip You can accomplish a lot in 3D graphics by looking up formulas on the Internet, but occasionally you

// type representing a couple type Couple = { him : string ; her : string } // list of couples let couples = [ { him = "Brad" ; her = "Angelina" }; { him = "Becks" ; her = "Posh" }; { him = "Chris" ; her = "Gwyneth" }; { him = "Michael" ; her = "Catherine" } ] // function to find "David" from a list of couples let rec findDavid l = match l with | { him = x ; her = "Posh" } :: tail -> x | _ :: tail -> findDavid tail | [] -> failwith "Couldn't find David" // print the results printfn "%A" (findDavid couples) The first rule in the findDavid function is the one that does the real work, checking the her field of the record to see whether it is "Posh", David s wife.

Note As you may have noticed, the name of our solution is the same as the ever-present and often overused Microsoft Northwind database. This is because the application covered in Part 3 of this book focuses on pushing the Northwind database to the Web.

may need to work out a little math yourself. Don t let that scare you if math is not your strong point you only need the basics, particularly in trigonometry.