.fam H
.ft H
.de HEADER
.ft H
.sp -0.1i \" PSPIC takes to much space here
.PSPIC -L smile.epsf 0.5i
.sp -0.1i
\l'\\n[.l]u'\h'-\\n[.l]u'
.br
.mk R1
.sp -0.4i
\h'0.6i'\s+8Demonstration of Presentations with Groff\
 and Acroread\s-8
.sp |\\n(R1u
.br
..
.de FOOTER
.ft H
\l'\\n[.l]u'\h'-\\n[.l]u'
.br
.tl '''%'
..
.LINKCOLOR red 1 blue
.TITLE "The making of this demo"
.DS CB
.PS
linethick=1.5i
arrowwid=0.08
boxwid=1.2i
ellipsewid=1.2i
down
PL: box "\m[blue]piclink.tmac\m[]" invis width 1.5i
    move down 0.25i
X:  [
IN: box "piclink.rof" invis
PIC:box "\m[blue]picture\m[]" invis with .n at IN.s width 0.8i height 0.3i
    move down 0.1i
    ]
    line dotted from X.nw to X.ne to X.se to X.sw to X.nw
MA: box "present.tmac" invis width 1.5i at X.IN + (2i,0)
    arrow down from X.s
GR: box "groff"
    arrow down
    move down 0.1i
    box "." "." "." invis
    arrow from MA.sw to GR.ne + (-0.3i,0)
    line from PL.s to X.n
LINK(L1,X.PIC)
LINK(L2,PL)
    move to (GR.x + 1.3i, GR.y)
    "groff -p -mm -mpresent \m[blue]piclink.tmac\m[] piclink.rof > piclink.pps" ljust
.PE
.DE
Clicking on a blue rectangle will take you to the linked page.
.P
.B Note :
The piclink macros are not loaded with a -m option.
That is because they need to processed by gpic to define the PIC macro.
.SK
.TITLE "PIC source"
.DESTINATION L1
.VERBON 0 14
\&.PS
linethick=1.5i
arrowwid=0.08
boxwid=1.2i
ellipsewid=1.2i
down
PL: box "\\m[blue]piclink.tmac\\m[]" invis width 1.5i
    move down 0.25i
X:  [
IN: box "piclink.rof" invis
PIC:box "\\m[blue]picture\\m[]" invis with .n at IN.s width 0.8i height 0.3i
    move down 0.1i
    ]
    line dotted from X.nw to X.ne to X.se to X.sw to X.nw
MA: box "present.tmac" invis width 1.5i at X.IN + (2i,0)
    arrow down from X.s
GR: box "groff"
    arrow down
    move down 0.1i
    box "." "." "." invis
    arrow from MA.sw to GR.ne + (-0.3i,0)
    line from PL.s to X.n
\m[blue]LINK(L1,X.PIC)\m[]
\m[blue]LINK(L2,PL)\m[]
    move to (GR.x + 1.3i, GR.y)
    "groff -p -mm -mpresent \\m[blue]piclink.tmac\\m[] piclink.rof > piclink.pps" ljust
\&.PE
.VERBOFF
.SK
.TITLE PIC LINK macros
.DESTINATION L2
The PIC macro
.VERBON 22 16
LINK(name,object)
.VERBOFF
makes a link from \f[CR]object\f[] to the destination \f[CR]name\f[]
defined somewhere with the macro DESTINATION.
.P
\f[CR]object\f[] must be an indication of a box, circle, or ellipse,
but the link itself will always be a rectangle.