Free ebook on Programming/Designing Flash: Getting Started with Flash.pdf

What is Flash

Flash is an authoring tool that designers and developers use to create presentations, applications, and other content that enables user interaction. Flash projects can include simple animations, video content, complex presentations, applications, and everything in between. In general, individual pieces of content made with Flash are called applications, even though they might only be a basic animation. You can make media-rich Flash applications by including pictures, sound, video, and special effects Flash is extremely well suited to creating content for delivery over the Internet because its files are very small. Flash achieves this through its extensive use of vector graphics. Vector graphics require significantly less memory and storage space than bitmap graphics because they are represented by mathematical formulas instead of large data sets. Bitmap graphics are larger because each individual pixel in the image requires a separate piece of data to represent it.

To build an application in Flash, you create graphics with the Flash drawing tools and import additional media elements into your Flash document. Next, you define how and when you want to use each of those elements to create the application you have in mind. When you author content in Flash, you work in a Flash document file. Flash documents have the file extension .fla (FLA). A Flash document has four main parts:

• The Stage is where your graphics, videos, buttons, and so on appear during playback. The Stage is described further in "Flash Basics" on page 49.
• The Timeline is where you tell Flash when you want the graphics and other elements of your project to appear. You also use the Timeline to specify the layering order of graphics on the Stage. Graphics in higher layers appear on top of graphics in lower layers............more

• The Library panel is where Flash displays a list of the media elements in your Flash document.
• ActionScript code allows you to add interactivity to the media elements in your document. For example, you can add code that causes a button to display a new image when the user clicks it. You can also use ActionScript to add logic to your applications. Logic enables your application to behave in different ways depending on the user's actions or other conditions. Flash includes two versions of ActionScript, each suited to an author's specific needs. For more information about writing ActionScript, see Learning ActionScript 2.0 in Flash in the Help panel.

Flash includes many features that make it powerful but easy to use, such as prebuilt drag-and-drop user interface components, built-in behaviors that let you easily add ActionScript to your document, and special effects that you can add to media objects

What you can do with Flash

With the wide array of features in Flash, you can create many types of applications. The following are some examples of the kinds of applications Flash can generate:

• Animations These include banner ads, online greeting cards, cartoons, and so on. Many other types of Flash applications include animation elements as well.
• Games Many games are built with Flash. Games usually combine the animation capabilities of Flash with the logic capabilities of ActionScript.
• User interfaces Many website designers use Flash to design user interfaces. The interfaces include simple navigation bars as well as much more complex interfaces. You can find an example of a navigation bar created with Flash across the top of the www.macromedia.com home page.
• Flexible messaging areas These are areas in web pages that designers use for displaying information that may change over time. A flexible messaging area (FMA) on a restaurant website might display information about each day's menu specials. You can find an example of an FMA on the www.macromedia.com home page. The tutorial in "Tutorial: Building Your First Flash Application" on page 95 guides you through the process of building an FMA.
• Rich Internet applications These include a wide spectrum of applications that provide a rich user interface for displaying and manipulating remotely stored data over the Internet. A rich Internet application could be a calendar application, a price-finding application, a shopping catalog, an education and testing application, or any other application that presents remote data with a graphically rich interface.

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