program lines1
   implicit none
   call init
   call viewport(0.2,0.2,0.8,0.8)
   call xyworld(0.0,0.0,1.0,1.0)
   call newpath
   call plot(0.1,0.1,3)
   call plot(0.9,0.1,2)
   call plot(0.9,0.9,2)
   call plot(0.1,0.9,2)
   call closepath
   call stroke
   call fin
   stop
   end