Simple .NET/ASP.NET PDF document editor web control SDK

Although none of these examples from the search results are an aesthetic match with the nancial executives, there are others that could work. For example, the photograph of the clipboard on the upper left in Figure 8-5 is simple enough to serve as the basis for a graphic in the presentation. A design constraint of this chapter includes not working with photo manipulation software, but you can still do simple things to make this image work if all you have is a preexisting photograph such as this one. Add three square boxes using PowerPoint drawing tools to create the check boxes (upper right), and then add the check marks (lower left). Shift the photo to the right half of the screen, add a black rectangle to the left, and then shift the headline to the left and change its font color to white (lower right).

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def code_is_safe (code) code =~ /[`;*-]/ false : true end while x = gets x.untaint if code_is_safe (x) next if x.tainted puts "=> #{eval(x)}" end

What happened here The >>> thingy is the prompt. You can write something in this space, like print "Hello, world!". If you press Enter, the Python interpreter prints out the string Hello, world! and you get a new prompt below that.

Caution code_is_safe merely checks if the line of code contains a backtick, semicolon, asterisk, or hyphen, and deems the code unsafe if it does. This is not a valid way to check for safe code, and is solely provided as an illustration.

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In this example you explicitly untaint the data if you deem it to be safe, so eval will execute any safe code.

So far in this chapter you ve looked at object-oriented concepts in depth, mostly in a technical sense. At this point, it would be useful to extend that knowledge by applying it in a real-world scenario. In this section, you re going to implement a mini text adventure/virtual dungeon. Text adventures were popular in the 1980s, but have fallen out of favor with modern gamers seeking graphical thrills. They re perfect playgrounds for experimenting with classes and objects, though, as replicating the real world in a virtual form requires a complete understanding of mapping real-world concepts into classes.

For a 45-minute presentation, the bulk of your work when adding graphics involves the Detail slides. As described in 7, you might have sketched photos or screen captures to add to these slides, as shown in Figure 8-29.

Before you can develop your classes, you have to figure out what you re trying to model. Your dungeon isn t going to be complex at all, but you ll design it to cope with at least the following concepts: Dungeon: You need a general class that encapsulates the entire concept of the dungeon game. Player: The player provides the link between the dungeon and you. All experience of the dungeon comes through the player. The player can move between rooms in the dungeon. Rooms: The rooms of the dungeon are the locations that the player can navigate between. These will be linked together in multiple ways (doors to the north, west, east, and south, for example) and have descriptions. A complete adventure would also have concepts representing items, enemies, other characters, waypoints, spells, and triggers for various puzzles and outcomes. You could easily extend what you ll develop into a more complete game later on if you wished to.

Note The term printing in this context refers to writing text to the screen, not producing hardcopies with

Our first concept to develop is that of the dungeon and the game itself. Within this framework come the other concepts, such as the player and rooms. Using nested classes you can lay down the initial code like so:

FIGURE 8-29 Explanation slide with graphic added (upper left), along with original sketches of the related

def initialize(player_name) @player = Player.new(player_name) @rooms = [] end class Player attr_accessor :name, :location def initialize(player_name) @name = player_name end end class Room attr_accessor :reference, :name, :description, :connections def initialize(reference, name, description, connections) @reference = reference @name = name @description = description @connections = connections end end end