(PHP 5 <= 5.3.0, PECL ming SVN)
Sets left rasterizing color
void SWFShape::setLeftFill ( SWFGradient $fill )
void setLeftFill ( int $red , int $green , int $blue [, int $a ] )
What this nonsense is about is, every edge segment borders at most two fills. When rasterizing the object, it's pretty handy to know what those fills are ahead of time, so the swf format requires these to be specified.
swfshape::setleftfill() se