Creating and Enriching Graphical User Interfaces - Beginning Java 7 - page 661

Figure 7-21. Select Transformation from the Demo menu to view the transformation
demonstration.
Composite Rule
Graphics2D declares void setComposite(Composite comp) for setting
the composite rule attribute. Pass any object whose class implements the
java.awt.Composite interfaceto comp .Call Composite getComposite()
to return the current composite rule.
The only class that implements this interface is java.awt.AlphaComposite ,
which implements basic alpha composite rules for combining source and destination
colorstoachieveblendingandtransparencyeffectswithgraphicsandimages.Thespe-
cificrulesimplementedbythisclassarethebasicsetof12rulesdescribedinT.Porter's
and T. Duff's “Compositing Digital Images” paper (SIGGRAPH 1984, pages 253 - 259 ).
AlphaComposite declares CLEAR , DST , DST_ATOP , DST_IN , DST_OUT ,
DST_OVER , SRC , SRC_ATOP , SRC_IN , SRC_OUT , SRC_OVER , and XOR integer
constants that describe these rules— SRC_OVER is the default. It also declares precre-