Full-featured Flash movies are best created using Macromedia's Flash software. Obviously, it is beyond the scope of this to teach the ins and outs of Flash authoring, so recommend using the tutorials that come with thesoftware as well as support documents provided by Macromedia.
The Flash authoring tool saves information about a movie in a .fla source file (also called a "Flash document" or "Flash editor document"). The .fla file contains all the separate elements that make up the movie and its timeline information in a fully editable format. When the movie is ready to go on the Web, it must be exported to .swf format. The suffix originally stood for"Shockwave Flash," but in the face of confusion with Macromedia's Shockwave for Director format, Macromedia has changed its tune and now translates .swf to "Small Web Format."
This new moniker is accurate. In the export process, the information from the original layered .fla file is flattened down to one layer and one timeline. The resulting file packs a lot of multimedia punch in a size that is appropriate for the Web.
Flash Interface Basics
As noted earlier, it is beyond the scope of this to teach Flash. However, it is useful to be generally acquainted with the Flash authoring environment.Figure shows the core features of the Flash interface as seen on a Macintosh (the Windows version is nearly the same). The following is a brief introduction to the way Flash handles multimedia content.
Figure: The Flash interface
The Stage is the area where you compose and preview the movie.
The elements on a timeline may be stored on separate layers (similar tolayers in image editing tools). Layers in Flash control the arrangement of objects from background to foreground, support masking, enable motion and shape tweening, and contain guide elements, frame labels, and actions.
Flash movies need only have one scene, but smart developers use scenes to better organize content. Scenes will play in sequential order by default. They may also be scripted to play based on user input (called an Action), like a rollover or a button click.
The Timeline is where you control the timing of the animation and assemble the elements from separate layers.
Like film, Flash movies divide lengths of time into individual frames. Akeyframe is a frame in which you define a change in the animation. Static frames reflect no change and merely repeat the content of the prior frame. Animation effects are added by changing content over a series of frames. The most efficient (both in terms of production time and processing power) method for adding animation is tweening, in which you create the beginning and end keyframe images and allow Flash to automatically create all the frame "in between."
The Library is where you store all imported items (such as images and audio) and symbols, Flash objects that you want to use repeatedly in the same movie (such as a button shape with its various interactive states). When you place a symbol on the Stage, you create an instance of that symbol.
The Controller contains the typical buttons for playing, pausing, and stepping through the frames of a movie when previewing it on the Stage.
The Toolbox contains all the tools for drawing, painting, selecting, viewing, and modifying artwork. Additional tools are available in individual floating panels that can be shown, hidden, or collapsed into a small bar until needed.
Optimizing Flash Movies
There are a number of measures you can take up front to make your .swf compress as small as it can. The following are just a few tips:
It is a good idea to use Flash's Test Movie or Test Scene functions to check your movie's performance. The Bandwidth Profiler simulates variousconnection speeds. You can also generate size reports to check the size of media components within the movie (it may reveal elements that could be optimized better).
Configuring the Server
Although no special server software is necessary to serve standard Flashfiles, you will need to configure your server to recognize a new MIME type.The specific syntax for configuration varies for different servers, socoordinate with your system administrator The following information will suit the needs of most servers:
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