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class MapOneClass { public static void MapOne() { // define a list of names List<string> names = new List<string>( new string[] { "Stefany", "Oussama", "Sebastien", "Frederik" }); // define a predicate delegate/function Converter<string, bool> pred = delegate(string s) { return s.StartsWith("S"); }; // convert to a FastFunc FastFunc<string, bool> ff = FuncConvert.ToFastFunc<string, bool>(pred); // call the F# demo function IEnumerable<string> results = DemoModule.filterStringList(ff, names); // write the results to the console foreach (var name in results) { Console.WriteLine(name); } } } The results of this example, when compiled and executed, are as follows: Stefany Sebastien Now, compare and contrast this to calling the filterStringListDelegate function, shown in the following example. Because you used a delegate, you can use the C# anonymous delegate feature and embed the delegate directly into the function call, reducing the amount of work the library user has to do and removing the compile-time dependency on FSharp.Core.dll. // !!! C# Source !!! using System; using System.Collections.Generic; using Strangelights;

Figure 3-6. One user story resulting from a split Figure 3-7 shows the other user story split from the example in Figure 3-5, which focuses on gathering information about the buyer. Notice that it doesn t list all the data you would expect to gather. Remember that a user story is brief and a promise for a future conversation. When the developers implement this user story, they can get all the specifics at that time. If the amount of detail on the user story is adequate to estimate and test, that is all you need.

scroll_direction = Vector2(0, 0) if joystick.get_numhats() > 0: scroll_direction = Vector2(*joystick.get_hat(0)) scroll_direction.normalize() analog_scroll = Vector2(0, 0) if joystick.get_numaxes() >= 2: axis_x = joystick.get_axis(0) axis_y = joystick.get_axis(1) analog_scroll = Vector2(axis_x, -axis_y) screen.fill((255, 255, 255)) screen.blit(picture, (-picture_pos.x, picture_pos.y)) time_passed = clock.tick() time_passed_seconds = time_passed / 1000.0 picture_pos += scroll_direction * scroll_speed * time_passed_seconds picture_pos += analog_scroll * scroll_speed * time_passed_seconds pygame.display.update() Although Listing 6-7 simply pans an image around the screen, it could be the basis for a scrolling map in a strategy or god game. Dealing with Joystick Dead Zones Because analog sticks and other axis devices are mechanical things, they tend to suffer from wear and tear, and even brand-new controllers can have imperfections. This can result in the stick wobbling a tiny amount when it is not being manipulated. If you see a constant stream of JOYAXISMOTION events without touching anything, then your controller suffers from this. Don t throw it away just yet, though this problem is easily handled in code. If the values for the axis are very close to zero, then set them to zero. This creates what is called a dead zone in the center of the stick, where no movement will be detected. It should be small enough that the player won t notice it but still mask any noise from worn-out sticks. Add the following snippet to the previous listing (just after axis_x and axis_y are assigned) to create a dead zone: if abs(axis_x) < 0.1: axis_x = 0. if abs(axis_y) < 0.1: axis_y = 0.

class MapTwoClass { public static void MapTwo() { // define a list of names List<string> names = new List<string>( new string[] { "Aurelie", "Fabrice", "Ibrahima", "Lionel" }); // call the F# demo function passing in an // anonymous delegate List<string> results = DemoModule.filterStringListDelegate( delegate(string s) { return s.StartsWith("A"); }, names); // write the results to the console foreach (var s in results) { Console.WriteLine(s); } } } The results of this example, when compiled and executed, are as follows: Aurelie

Python lists are mutable, which means you can change them after they have been created. So as well as retrieving the contents of a list with the index operator, you can change the item at any index by assigning a new item to it. Let s say we specifically want to get dark soy sauce; we can change the second item by assigning it a new value with the assignment operator (=): >>> my_list[1]='dark soy sauce' >>> my_list ['chopsticks', 'dark soy sauce', 'wasabi', 'fugu', 'sake', 'apple pie']

Figure 3-7. A user story with enough information Let s look at one more example. See if you can determine what is wrong with the user story in Figure 3-8. What do you know about the packing label printer You probably don t know too much about it. Interfacing to this printer may be an issue. This user story is a good candidate for a spike.