ASP.NET Web PDF Document Viewer/Editor Control Library

Just as a lmmaker would, the best way to start getting visual in your storyboard is to sketch what you would like on each slide before you go looking for the actual graphics that you ll use. Creating sketches of the slides accelerates the design process because it keeps you from getting distracted amidst the many visual possibilities you ll nd when you search through photo and graphics libraries. A series of sketches can also help you to select a consistent style, because you see all of the slides together and can consider a design for all of the slides at once.

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So far in this chapter, you ve created single instances of number and string objects and manipulated them. After a while, it becomes necessary to create collections of these objects and to work with them as a list. In Ruby, you can represent ordered collections of objects using arrays.

Here s a basic array:

If you ve never sketched your PowerPoint slides before, this might seem like an extra step that you don t have the time to take. But the investment you make in taking the time to sketch will actually save you time in the long run. Much of the frustration that comes from developing PowerPoint presentations, especially in an organizational context, comes from endless revisions to graphics. When you sketch your slides rst, you get everyone involved to sign off on the sketches to make sure that they re what everyone wants. By getting agreement on the visual concepts now, you save frustration, inef ciency, confusion, and unhappiness later.

x = [1, 2, 3, 4]

can use a tuple of values (if you want to format more than one), or, as I discuss in the next chapter, you can use a dictionary. The most common case is the tuple: >>> format = "Hello, %s. %s enough for ya " >>> values = ('world', 'Hot') >>> print format % values Hello, world. Hot enough for ya

This array has four elements. Each element is an integer, and is separated by commas from its neighboring elements. All the elements are contained within square brackets. Elements can be accessed by their index (their position within the array). To access a particular element, an array, or a variable containing an array, is followed by the index contained within square brackets. This is called an element reference. For example:

x = [1, 2, 3, 4] puts x[2]

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As with most programming languages, the indexing for Ruby s arrays starts from 0, so the first element of the array is element 0, and the second element of the array is element 1, and so on. In our example, this means x[2] is addressing what we d call the third element of the array, which in this case is an object representing the number 3. To change an element, you can simply assign it a new value or manipulate it as you ve manipulated numbers and strings earlier in this chapter:

x[2] += 1 puts x[2]