.NET/ASP.NET/C#/VB.NET PDF Document SDK

In 4, you used a story thread to prepare new information for the eye of the needle of your audience s working memory, and in 5, you used the sharp tip of a triangle of hierarchy to determine the sequence and order of information along that thread. Now in this chapter you will focus on the two strands of that story thread. These two strands represent the two essential elements that you have to coordinate in any multimedia presentation the visual and verbal channels, as described in 2. You ll learn how to guide the visual and verbal strands over the next three chapters. Your challenge in this chapter is to set up your PowerPoint presentation in speci c ways to guide these two strands through the entire presentation so that you don t split the attention of the audience or create wasteful redundancy. In 7, you ll explore the wide range of options you have to plan and sketch the graphics for your storyboard; in 8,

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Ruby libraries don t need to be packaged in any special way (unlike, say, Java s JAR archives). Ruby does have a library packaging system called RubyGems (covered in the next section), but its use is entirely optional. The simplest way to create a library is to create a Ruby file containing classes and methods and use require to load it. This technique will be familiar to Perl (using use), C (using #include), Pascal (using uses), and other developers. Let s assume you have a file called mylib.rb containing the following:

Note You will probably have to have administrator privileges (a root account) in order to install Python

And then you have another file like so:

6

This program loads in mylib.rb and includes its classes, methods, and other particulars into the current runtime environment, meaning that MyLib.hello_world calls the correct routine. Ruby searches through its library folders in a specific order (and, usually, the current directory too, as in the previous example) as dictated by the special variable $:. This variable is an array that can be manipulated like any other array. You can push, pop, and otherwise change the order and directories in which your program searches for libraries. Here s an example of what $: contains on an Intel Mac running Ruby 1.8.5:

["/usr/local/lib/ruby/site_ruby/1.8", "/usr/local/lib/ruby/site_ruby/1 .8/i686-darwin8.8.1", "/usr/local/lib/ruby/site_ruby", "/usr/local/lib /ruby/1.8", "/usr/local/lib/ruby/1.8/i686darwin8.8.1", "."]

you ll add the nal graphics based on the sketches you choose; and in 9, you ll see the BBP approach applied to a range of different types of presentations that you can refer to for inspiration. You can expect that it will take some time to learn and apply the techniques described in these chapters, but as you develop your BBP skills, the process will go faster, and PowerPoint 2007 will become a handy tool for rapid visual prototyping of creative concepts. As you build presentations over time, you ll develop a personal library of styles that you can review for inspiration on future projects.

This topic is covered in depth in 7, and demonstrations of several Ruby libraries are offered in 16. A basic Ruby library is also created from scratch in 12.

The append method is used to append an object to the end of a list: >>> >>> >>> [1, lst = [1, 2, 3] lst.append(4) lst 2, 3, 4]

RubyGems (http://rubygems.org/) is a packaging system for Ruby libraries and applications. Each package within the RubyGems universe is called a gem or RubyGem (in this book both terms are used interchangeably). RubyGems makes it easier to distribute, update, install, and remove libraries and applications on your system. Before the advent of RubyGems, Ruby libraries and applications were distributed in a basic fashion in archive files, or even as source code to copy and paste from the Web. RubyGems makes it easier and more centralized, and also takes care of any prerequisites and dependencies required when installing a library. For example, here s how to install the Ruby on Rails system:

This installs the Rails gems along with all their dependencies. The gem application prompts at each step of the way so you know exactly what s being installed (you can override this with command line options). For example, gem install rails y installs Rails and its dependencies without questioning you at all. You can uninstall gems in as simple a fashion: