The swf_addcolor() function sets
the global add color to the
rgba color specified. This color is then used
(implicitly) by the
swf_placeobject(),
swf_modifyobject() and the
swf_addbuttonrecord() functions. The color of the
object will be add by the
rgba values when the object is written to the
screen.
注: The rgba values can be either positive or negative.