Me too , try this...
Graphics 640,480 SetBuffer BackBuffer() outerr = Rand(0,220) innerr = outerr - Rand(10,outerr) col = Rand(0,16777215) Repeat LockBuffer BackBuffer() For x=-outerr To outerr For y=-outerr To outerr r= Sqr((x*x)+(y*y)) If r>=innerr And r<=outerr Then If intriangle(x,y,0,0,Sin(ang)*(outerr*2),Cos(ang)*(outerr*2),Sin(ang+2)*(outerr*2),Cos(ang+2)*(outerr*2)) Then If r=innerr Or r=outerr Then c=16777215 Else c=col WritePixelFast x+320,y+240,c EndIf EndIf Next Next UnlockBuffer BackBuffer() Flip ang = (ang + 1) Mod 360 If ang = 0 Then outerr = Rand(0,220) innerr = outerr - Rand(10,outerr) col = Rand(0,16777215) EndIf Until KeyHit(1) Function InTriangle(x,y,x1,y1,x2,y2,x3,y3) ab# = (y-y1)*(x2-x1) - (x-x1)*(y2-y1) ca# = (y-y3)*(x1-x3) - (x-x3)*(y1-y3) bc# = (y-y2)*(x3-x2) - (x-x2)*(y3-y2) Return ab*bc>0 And bc*ca>0 End Function