- gsave -                               save graphics state

- grestore -                            restore graphics state

- grestoreall -                         restore to bottommost graphics state

- initgraphics -                        reset graphics state parameters

num setlinewidth -                      set line width

- currentlinewidth num                  return current line width

int setlinecap -                        set shape of line ends for stroke
                                        (O=butt,1 =round, 2=square)

- currentlinecap int                    return current line cap

int setlinejoin -                       set shape of corners for stroke
                                        (O=miter,1 =round, 2=bevel)

- currentlinejoin int                   return current line join

num setmiterlimit -                     set miter length limit

- currentmiterlimit num                 return current miterlimit

array offset setdash -                  set dash pattern for stroking

- currentdash array offset              return current dash pattern

num setflat -                           set flatness tolerance

- currentflat num                       return current flatness

num setgray -                           set color to gray value
                                        from 0 (black) to 1 (white)

- currentgray num                       return current gray

hue set brt sethsbcolor -               set color given hue,saturation,
                                        brightness
- currenthsbcolor hue sat brt           return current color,hue, saturation,
                                        brightness

red green blue setrgbcolor -            set color given red, green, blue

- currentrgbcolor red green blue        return current color red, green, blue

 freq angle proc setscreen -            set halftone screen

- currentscreen freq angle proc         return current halftone screen

 proc settransfer -                     set gray transfer function

- currenttransfer proc                  return current transfer function