Edges are used to define a shape vector based and also coordinates where images need to be drawn. The edges are always coordinates from where ever your last point was to where ever you want the next point to be (a little like a turtle in LOGO).
A condition is defined in a DefineButton2 tag. It is a record of conditions. The record terminates when the size of the current (i.e. last) condition is zero. The length of that condition can be deduced from the total size of the tag minus the offset where the condition starts. Conditions are similar to events.
The f_key field represents a key code since version 4. The following table gives the code equivalence. Note that 0 means no key.
The pages defined below include all the actions defined in Flash.
Different actions are supported in different version, so please, look at the version when attempting to use that action.
Some actions have been deprecated and should not be used in newer version of Flash (mainly the untyped operators.)
There are two schemes supported in Flash 9 and over: ActionScript 2 and 3 (also referenced as AS2 and AS3.)
Since Flash version 9, actions can be saved in a new format named abcFormat by the Tamarin project from the Mozilla organization.
The code itself (action script) is the same, but the structure of an swf_action3 holds object oriented information about classes, methods and such in a really clean way (really! in comparison to the old way, that's dead clean!).
At this time, the swf_action3 structure is documented in the abcFormat.html file.
I will duplicate and test the structures at a later time.
A filter defines how to transform the objects it is attached to. The first byte is the filter type. The data following depend on the type. Because each filter is much different, they are defined in separate structures. You can attach a filter to an object using an ActionScript or the PlaceObject3 tag.
The following describes the different filters available since version 8.
A DefineSound tag declares a set of samples of a sound effect or a music.
The sound samples can be compressed or not, stereo or not and 8 or 16 bits. The different modes are not all available in version 2, although the same tag is used in newer versions with additional capabilities.
The f_sound_is_16bits is always set to 1 (16bits samples) if the samples are compressed (neither Raw
nor Uncompressed
).
The f_sound_rate represents the rate at which the samples are defined. The rate at which it will be played on the target computers may differ. The following equation can be used to determine the ...
It is common to use the DefineFont tag in order to create an array of shapes later re-used to draw strings of text on the screen. Note that the definition of the shape within a font is limited since it can't include any specific fill and/or line style. Also, each shape is assumed to be defined within a 1024x1024 square. This square is called the EM Square. Fig 1. below shows you the EM Square and how it is used. The characters baseline can be placed anywhere within the EM Square (it certainly can be outside too if you wish?!?).
At the very beginning, a company created the SWF format to generate small vector animations on the Internet called Shockwave Flash (hence the name of the format, SWF.) It also included images. This company was bought by Macromedia around 1997 (if I recall properly). This is when Flash v3 was created. Since then, Macromedia created a new version about once a year up to version 8. At that time (in 2005/2006), Macromedia sealed a deal with Adobe which wanted to use the SWF format in their PDF files.
Today (May 1st, 2008), the SWF format is available for free to all. It can be ...
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