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During story creation, two important questions are considered for each user story: The developers are deciding if they can estimate the user story. The acceptance testers are considering if they are able to test the user story. If either of these groups cannot say yes to their respective questions, then the user story is not well defined. Sometimes, the developers may say that they do not know if they can estimate the user story. This can be the case if the developers are unfamiliar with the aspect of the technology they plan to use or the business domain in which they are working. In these cases, the developers will tell the customer they will need to spike the user story. The purpose of the spike is to give the developers some level of understanding as to what it will take to implement a user story. The developers generally break off from the rest of the team and investigate the requirement. The developers should try to find experts who can help them understand the solution. As a rule, the spike should not take more than a day or two to research.

Let s start out by examining simple straight-line movement. If we move an image by a fixed amount each frame, then it will appear to move. To move it horizontally, we would add to the x coordinate, and to move it vertically we would add to the y coordinate. Listing 5-1 demonstrates how to move an image horizontally. It draws an image at a specified x coordinate and then adds the value of 10.0 to each frame, so that on the next frame it will have shifted a little to the right. When the x coordinate passes over the right edge of the screen, it is set back to 0 so that it doesn t disappear completely. Moving 2D images are often referred to as sprites. Listing 5-1. Simple Straight-Line Movement (simplemove.py) background_image_filename = 'sushiplate.jpg' sprite_image_filename = 'fugu.png' import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) background = pygame.image.load(background_image_filename).convert() sprite = pygame.image.load(sprite_image_filename) # The x coordinate of our sprite x = 0. while True: for event in pygame.event.get(): if event.type == QUIT: exit()

let argList = [ "-set", Arg.Set myFlag, "Sets the value myFlag"; "-clear", Arg.Clear myFlag, "Clears the value myFlag"; "-str_val", Arg.String(fun x -> myString := x), "Sets the value myString"; "-int_val", Arg.Int(fun x -> myInt := x), "Sets the value myInt"; "-float_val", Arg.Float(fun x -> myFloat := x), "Sets the value myFloat"; ] if System.Environment.GetCommandLineArgs().Length <> 1 then Arg.parse argList (fun x -> myStringList := x :: !myStringList) "Arg module demo" else Arg.usage argList "Arg module demo" exit 1

Perhaps the best approach to understanding user stories is to look at a few and decide if they are good or bad and why. Look at the user story in Figure 3-2. It has a title and a short description. It

"myFlag: %b" !myFlag "myString: %s" !myString "myInt: %i" !myInt "myFloat: %f" !myFloat "myStringList: %A" !myStringList

screen.blit(background, (0,0)) screen.blit(sprite, (x, 100)) x+= 10. # If the image goes off the end of the screen, move it back if x > 640.: x = 640. pygame.display.update() If you run Listing 5-1, you will see the fugu image sliding from left to right. This is exactly the effect we were looking for, but there is a flaw in the design for Listing 5-1. The problem is that we can t know exactly how long it will take to draw the image to the screen. It looks reasonably smooth because we are creating an extremely simple frame, but in a game the time to draw a frame will vary depending on how much activity there is on screen. And we don t want a game that slows down just as it is getting interesting. Another problem is that the sprite in Listing 5-1 will move more slowly on less powerful computers and more quickly on more capable machines.