SET COLOR mode "NATIVE"
SET WINDOW -5,5,-5,5
LET w=0
SET AREA COLOR colorindex(w/255,w/255,w/255)
PLOT AREA: 0,-5;5,-5;5,5;0,5
FOR w=30 TO 240
   SET DRAW mode hidden       ! ちらつき防止
   SET AREA COLOR colorindex(w/255,w/255,w/255)
   PLOT AREA: 1,0.5;4,0.5;4,3.5;1,3.5
   PLOT AREA: -1,0.5;-4,0.5;-4,3.5;-1,3.5
   PLOT AREA: -4,-3.5;4,-3.5;4,-0.5;-4,-0.5
   SET TEXT FONT "MS ゴシック",100
   SET TEXT COLOR 3
   PLOT TEXT, AT 1.4,0.8:"あ"
   PLOT TEXT, AT -3.6,0.8:"あ"
   PLOT TEXT, AT 1.4,-3.4:"い"
   PLOT TEXT, AT -3.6,-3.4:"い"
   WAIT DELAY 0.1
   SET DRAW mode explicit   ! ちらつき防止
NEXT w
END