ASP.NET Web PDF Document Viewer/Editor Control Library

PowerPoint 2007 is an easy-to-use and powerful media tool that can produce impressive results But if you re like most people who use PowerPoint, you re not a graduate of a design school In addition, every design project has constraints that will limit what you can do as much as you might want to take your time creating a work of art, the reality might be that you have only until tomorrow or next week to create a PowerPoint masterpiece It s important that you know up front what limits you have so that you can plan your project accordingly You can do that by asking a few questions: What is the scope of the project Look at your presentation in Slide Sorter view, as shown in Figure 8-1, to get a sense of the number of graphics you will need to nd.

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Here s a much more complex example:

Now, you ve got plenty of things that return truth values. (In fact, given the fact that all values can be interpreted as truth values, all expressions return them.) But you may want to check for

User.find_by_email('me@privacy.net').country = 'Belgium'

It s a good idea to rst identify where you will not need graphics so that you can eliminate those from your count For example, if you re giving only a 15minute version of your presentation, you will hide the 45-minute version slides, as described in 6, and focus your efforts only on the other slides you need Likewise, if you ll be switching over to another software application to present the ideas on some of the 45-minute version slides, you won t need to add graphics to those slides either because you ll hide those slides as well How much time do you have Next determine how much time you have to get the job done.

This code is nowhere near as obvious as the Hello, world! example, but you should still be able to take a good guess at what it does. First, it tells the computer you want to work with a concept called User. Next, it tries to find a user with a specified e-mail address. Last, it takes the user s country information and changes it to Belgium. Don t worry about how the data is stored for users at this point; that comes later. This is a reasonably advanced example, but demonstrates a single concept from a potentially complex application where you can deal with different concepts such as users. By the end of this chapter you ll see how you can create your own real-life concepts in Ruby and operate upon them in a similar way to this example. Your code can be as easy to read as English too.

First, some examples of the methods provided by Enumerable:

If your presentation is a report for this afternoon, you will have to do the best you can with the resources at hand, but if it s a presentation for a new product launch in three months, you obviously have more time to invest and to bring other people in on the project Consider whether you have any additional deadlines before you need the nal version of the PowerPoint le, such as marketing or legal approval All of these factors will determine whether you have a couple of hours, a day, a couple of days, a week, a month, or longer to get the project done..

more than one condition. For example, let s say you want to write a program that reads a number and checks whether it s between 1 and 10 (inclusive). You can do it like this: number = input('Enter a number between 1 and 10: ') if number <= 10: if number >= 1: print 'Great!' else: print 'Wrong!' else: print 'Wrong!' This will work, but it s clumsy. The fact that you have to write print 'Wrong!' in two places should alert you to this clumsiness. Duplication of effort is not a good thing. So what do you do It s so simple: if number <= 10 and number >= 1: print 'Great!' else: print 'Wrong!'

[1,2,3,4].collect { |i| i.to_s + "x" }

=> ["1x", "2x", "3x", "4x"]

8

[1,2,3,4].detect { |i| i.between (2,3) }

=> 2

Note In this example, you could (and quite probably should) have made this even simpler by using the following chained comparison: