SWF::Builder::ActionScript - SWF ActionScript object.


  $mc->frame_action(1)->compile( <<AS_END );
    function move_mc(dx) {
        this._x += dx;

  my $mc_i = $mc->place;
  $mc_i->on('KeyPress', '<Left>')->compile('move_mc(-5)');
  $mc_i->on('KeyPress', '<Right>')->compile('move_mc(5)');


SWF::Builder::ActionScript supports some simple actions and compiling ActionScript compatible with FlashMX.


Methods for movie clip to create a frame action and a clip action. These return an SWF::Builder::ActionSctipt object.

$as = $mc->frame_action( $frame )

creates a frame action.

$as = $mc_i->on/onClipEvent( $event [, $key] )

creates a clip action. See SWF::Builder::MovieClip for details of the events.

Simple actions

These method add some simple actions to $as and return $as itself.

$as->gotoAndPlay( $frame )

tells the flash player to go to $frame.

$as->gotoAndStop( $frame )

tells the flash player to go to $frame and stop playing.


tells the flash player to play the movie clip.


tells the flash player to stop playing the movie clip.

$as->setProperty( $property, $value )

sets a movie clip property.

$as->moveto( $x, $y )

moves the movie clip to ($x, $y).

$as->r_moveto( $dx, $dy )

moves the movie clip to (current X + $dx, current Y + $dy).

$as->rotate( $r )

rotates the movie clip toward $r degree absolutely.

$as->r_rotate( $dr )

rotates the movie clip to +$dr degree right.

$as->scale( $xscale [, $yscale] )

magnifies/reduces the movie clip.


shows the movie clip.


hides the movie clip.

$as->tellTarget( $target, \&actionsub )

changes the target movie clip for actions in &actionsub. $target is a target path string in slash syntax. &actionsub is called with an ActionScript object whose target is changed. For example,

  $mc_i->on('Press')->tellTarget( 'mc_i2', sub {

rotates 'mc_i2' to 15-degree right when $mc_i is clicked.


SWF::Builder::ActionScript has a FlashMX-compatible compiler for complex actions.

$as->compile( $script_text [, %options] )

compiles $script_text. Options are as follows:

Optimize => $opt_string

controls optimization. Optimize option strings are as follows:

 O_PEEPHOLE  peephole optimization.
 O_CONSTEXP  calculate constant expressions.
 O_CONSTMATH calculate math funcions with constant args and constant properties.
 O_LEFTONCE  evaluate a lefthand side of an assignment expression only once. See ATTENTION.
 O_REGISTER  assign local variables to registers.
 O_LOCALREG  assign local variables to local registers using ActionDefineFunction2 (aka 'Optimize for Flash Player 6r65').
 O_6R65      same as 'O_LOCALREG'.
 O_ALL       enable all optimize options.

If you want to reset an optimize option, put a minus sign on the head of the option. All optimize options are joined with space or '|'. Default is 'O_ALL|-O_REGISTER|-O_LOCALREG' (enable all optimize options except O_REGISTER and O_LOCALREG).

ATTENTION: FlashMX ActionScript compiler seems to evaluate a lefthand side of a compound assignment operator twice, while ECMA-262 provides to evaluate it once. For example, FlashMX compiles 'a[i++] += 2' as same as 'a[i++] = a[i++] + 2', which counts up i twice. O_LEFTONCE controls this. If you want the same as FlashMX, give '-O_LEFTONCE'.

Trace => $mode

tells the compiler how to compile 'trace' action.


ignore all trace action.


evaluate the parameters of a trace action, but don't output anything. This is default.


output the value to another movie via a LocalConnection. You can use 'tracewindow.swf' at scripts directory as output window.


use ActionTrace tag.

Warning => $level

sets the warning level.

 0: deplicated actions.
 1: useless operator in void context.
 2: future reserved and other unsupported features.
$as->load( $script_filename [, %options] )

loads a script and compiles it. See compile method for %options.

Compiler bugs/features

Pragmas are not supported.

The compiler evaluates a lefthand side of an assignment expression once by default. See Optimize option.



Copyright 2003 Yasuhiro Sasama (ySas), <>

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.