question: public void area ( String srcName , Paint color , String legend , boolean stack ) { if ( legend != null ) { comments . add ( new LegendText ( color , legend ) ) ; } SourcedPlotElement parent = stack ? findParent ( ) : null ; plotElements . add ( new Area ( srcName , color , parent ) ) ; }
target:  Plots requested data in the form of the filled area starting from zero, using the color specified.