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

For comparison, take a look at a conventional PowerPoint presentation in Slide Sorter view, as shown in Figure 2-11. Audiences might not know about the limited capacity of working memory, but they do know what they re talking about when they say presentations like this are a Data dump! and Overwhelming! They ve been down the road to overload before, and Slide Sorter view shows exactly how the conventional approach takes them there. The new information is clearly not presented in bite-size pieces; instead, it lls every slide, slide after slide, with overwhelming detail.

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Note You can find listings for basic Web, bot-to-bot, and text file clients in the next section of this

One significant benefit of keeping all your bot s functionality well separated within its own class and with multiple interoperating methods is that you can tweak and add functionality easily. In this section we re going to look at some ways we can easily extend the basic bot s functionality to handle other input sources than just the keyboard. When you began to create the core Bot class, you looked at a sample client application that accepted input from the keyboard, passed it on to the bot, and printed the response. This simple structure demonstrated how abstracting separate sections of an application into loosely coupled classes makes applications easier to amend and extend. You can use this loose coupling to create clients that work with other forms of input.

I m sure you noticed a small detail in the previous section that may have seemed odd: the plural form in _ _bases_ _. I said you could use it to find the base classes of a class, which implies that it may have more than one. This is, in fact, the case. To show how it works, let s create a few classes: class Calculator: def calculate(self, expression): self.value = eval(expression) class Talker: def talk(self): print 'Hi, my value is', self.value

Note When designing larger applications, it s useful to keep in mind the usefulness of loosely coupling

The slides do not help introduce new information with a familiar structure. There are no visible signals to indicate which slides are most important.

the different sections so that if the specifications or requirements change over time, it doesn t require a major rewrite of any code to achieve the desired result.

You could create an entire one-sided conversation in a text file and pass it in to a bot to test how different bots respond to the same conversation. Consider the following example:

FIGURE 2-11 Slide Sorter view of a conventional PowerPoint presentation reveals no digestible pieces and

require 'bot' bot = Bot.new(:name => ARGV[0], :data_file => ARGV[1]) user_lines = File.readlines(ARGV[2], 'r') puts "#{bot.name} says: " + bot.greeting user_lines.each do |line| puts "You say: " + line puts "#{bot.name} says:" + bot.response_to(line) end

class TalkingCalculator(Calculator, Talker): pass The subclass (TalkingCalculator) does nothing by itself; it inherits all its behavior from its superclasses. The point is that it inherits both calculate from Calculator and talk from Talker, making it a talking calculator: >>> >>> >>> Hi, tc = TalkingCalculator() tc.calculate('1+2*3') tc.talk() my value is 7 This is called multiple inheritance, and can be a very powerful tool.

This program accepts the bot s name, data filename, and conversation filename as command line arguments, reads in the user-side conversation into an array, and loops through the array, passing each line to the bot in turn.

What you see here is visual tedium rather than visual organization. As in most PowerPoint presentations, these slides use a design template with a single predesigned background. Using a single background gives all your slides a uniform look, but it also prevents you from using a range of design techniques to visually highlight the most important information on single slides or across slides. It also makes the overall presentation appear visually repetitive, which causes boredom that quickly shuts down attention.

One common thing to do with many applications is to tie them up to the Web so that anyone can use them. This is a reasonably trivial process using the WEBrick library covered in 10.

require 'webrick' require 'bot' # Class that responds to HTTP/Web requests and interacts with the bot class BotServlet < WEBrick::HTTPServlet::AbstractServlet

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