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If you have a limited budget, as in this project, it s worth taking a few minutes to make a quick check of the graphical resources you have available before you commit to a motif you will use in your story template and sketches. You might have a great idea for a motif, but if you don t have the available graphics to pull it off, it won t become a visual reality. A lightbox, available at some stock photography Web sites, is a very useful tool in your research for available graphics. You can use the lightbox to temporarily collect photos in a single place, without committing to purchasing licenses until you are ready to use speci c photos. For example, create a lightbox named The Plan Presentation at iStockphoto. In keeping with the race motif of The Plan presentation example, search for terms such as hurdles, runners, and nish line, and when you see a photo you like, click the Add To Lightbox button below the photo. In the pop-up window, select The Plan Presentation lightbox, and then click Add. When you have nished your search, visit The Plan

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For example, you might want to create an application that can manage the booking of tickets for sports events. The concepts involved include events, people, tickets, venues, and so forth. Ruby lets you put these concepts directly into your programs, create object instances of them (instances of an event might be the Super Bowl or the final of the 2010 World Cup), and perform operations upon and define relationships between them. With all these concepts in your program, you can quickly relate events to venues and tickets to people, meaning that your code presents a logical system from the outset. If you haven t programmed much before, the idea of taking real-life concepts and using them directly in a computer program might seem like an obvious way to make software development easier. However, object orientation is a reasonably new idea in software development (the concept was developed in the 1960s, but it only became popular in mainstream programming in the 1990s). With non object-oriented languages, the programmer has less flexibility in handling concepts and the relationships between them and will have a lot of overhead to deal with.

Let s jump directly into some source code demonstrating a simple concept, a person:

9

Ruby seemed a lot like English before, but it doesn t seem much like English when defining concepts. Let s go through it step by step:

Returns a one-character string with ordinal n (0 n < 256) Evaluates a string as an expression and returns the value Yields (index, value) pairs suitable for iteration Returns the integer ordinal value of a onecharacter string Creates a list of integers Yields the values of seq in reverse order, suitable for iteration Returns a list with the values of seq in sorted order Creates an xrange object, used for iteration Creates a new sequence suitable for parallel iteration

This line is where you start to define the concept of a person. When we define concepts in Ruby (or in most other object-oriented languages, for that matter) we call them classes. A class is the definition of a single type of object. Class names in Ruby always start with a capital letter, so your programs will end up with classes with names like User, Person, Place, Topic, Message, and so forth.

Presentation lightbox, and you ll see thumbnails of all the images you selected in your search in a single space, as shown in Figure 9-7.

The preceding line provides three attributes for the Person class. An individual person has a name, an age, and a gender, and this line creates those attributes. attr stands for attribute, and accessor roughly means make these attributes accessible to be set and changed. This means that when you re working with a Person object in your code, you can change that person s name, age, and gender (or, more accurately, its name, age, and gender attributes).