Module CheckIt {
      Er$="Pset is a new statement"
      If Version<9.4 Then Error Er$
      If Version=9.4 then If revision<26 then Error Er$
      Form 60, 40
      Cls 0 ' Black
      Gradient 0,1
      Pen 14 ' Yellow
      Set Fast !
      Refresh 500
      Module Sphere (R as long, X0 as long, Y0 as long, fun){
            R2 = R * R
            Def Long X, Y, D2
            Let Scale=twipsx/R*13.5
            For Y = -R To R  step twipsx  {
            Move X0-R, Y+Y0
            For X = -R To R step twipsy  {
                  D2 = X **2 + Y **2
                  IF R2>D2 THEN Pset Fun(Max.Data(Min.Data((Sqrt(R2 - D2) - ( X + Y) / 2 )*Scale ,255),0))
                  Step twipsx
            }
            }
      }
      Blue=lambda (c)->{
            c1=c/4+192
            =Color(c,c,c1)
      }
      Blue1=lambda (c)->{
            c1=c/4+Random(150,192)
            =Color(c,c,c1)
      }
      Mystery=lambda m=1 (c)->{
            c1=c/4+m
            m+=10
            if m>192 then m=1
            =Color(c,c,c1)
      }
      Mystery2=lambda m=1, p=true  (c)->{
            c1=c/4+m
           if p then m+=10
           Else m=-10
            if m>192 then m-=10 : p=false
            If m<0 then m+=10: p=true
            =Color(c,c,c1)
      }
      Buffer Alfa as byte*8
      Trans =lambda  Alfa (c) -> {
            Return Alfa, 0:=-point as long
            Return Alfa, 4:=-color(c,c, c/4+192) as long
            for i=0 to 2: Return Alfa, i:=(Eval(Alfa, i)+Eval(Alfa, i+4))/2: Next i
            =-Eval(Alfa, 0 as long)
      }
      Sphere 2400, 9000,7000, Blue
      Sphere 800, 6000, 7000, Blue1
      Sphere 1200, 5000,5000, Mystery
      Sphere 1200, 10000,6000, Mystery2
      Sphere 1200, 8000,5000, trans
}
Checkit