Polar Grid  
Displays an array of values as a circular grid of cells, very similar to for example a hard disk plate with sectors and tracks. The AddCell method is used to fill the series:
for Sector:=0 to NumSectors-1 do
    for Track:=0 to NumTracks-1 do
    begin
      tmp:=0.5*Sqr(Cos(Sector/(NumSectors*0.2)))+
               Sqr(Cos(Track/(NumTracks*0.2)))-