/draw_round_box % width height x y blot
{
- setlinewidth % w h x y
- 0 setlinecap
- 1 setlinejoin
+ dup
+ 0.0 gt {
+ setlinewidth % w h x y
+ 0 setlinecap
+ 1 setlinejoin
- rmoveto % w h
- currentpoint % w h x1 y1
- 4 2 roll % x1 y1 w h
- 4 copy
- rectfill
- rectstroke
+ rmoveto % w h
+ currentpoint % w h x1 y1
+ 4 2 roll % x1 y1 w h
+ 4 copy
+ rectfill
+ rectstroke
+ } {
+ pop % w h x y
+ rmoveto % w h
+ currentpoint % w h x1 y1
+ 4 2 roll % x1 y1 w h
+ rectfill
+ } ifelse
} bind def
/draw_polygon % fill? x(n) y(n) x(n-1) y(n-1) ... x(0) y(0) n blot