Rectangle 0 5 50 35
moveto 50 20
lineto 80 20
SolidPen 0 0 128 1
MoveTo 3 8
LineTo 3 32
LineTo 47 32
// PI line
SolidPen 255 0 0 2
MoveTo 4 31
Lineto 4 20
LineTo 46 10
Label 40 25 P,I
// limiter
solidpen 255 0 0 0
moveto 55 15
lineto 60 17
lineto 70 17
lineto 75 15
moveto 55 25
lineto 60 23
lineto 70 23
lineto 75 25