[ferret_users] units of $ppl$xlen and friends

[Ryo Furue <furue@xxxxxxxxxx>]

Hi Ferreters,

I'm wondering how $ppl$xlen and friends are defined.
The manual says that they are in inches, but they seem
to change their values in viewports . . . in a mysterious
way, to me.  As the example below shows, for a viewport of
(0,1)x(0,1), $ppl$xlen is 9.478 with win/aspect=1.  But,
for (0,0.5)x(0,0.5), it's 6.127, and for (0.5,1)x(0.5,1),
it's 6.081 .

I'm plotting, say, four panels using four views, and in
the last plot command I'm producing a color bar, using the
values of $ppl$xlen and friends.  But, I don't know
how to control its exact location and size because of the
problem above.

I'm using FERRET v6.07/Linux(g77).

Regards,
Ryo

!!>>>> EXAMPLE >>>>>>>>>>>>>>>>>>>>>>>>>>
set mode grat:dash
set data levitus_climatology
 
set window/aspect=1.0
 
define view/axes/xlimits = 0.0, 1.0 \
                /ylimits = 0.0, 1.0 myfull
 
define view/axes/xlimits = 0.0, 0.5 \
                /ylimits = 0.0, 0.5 myll
 
define view/axes/xlimits = 0.5, 1.0 \
                /ylimits = 0.5, 1.0 myur
 
set view myfull
fill/k=1/l=1/set temp
  say ($ppl$xlen) ($ppl$ylen) !prints "9.474 9.474"
ppl fill
 
set view myll
fill/k=1/l=1/set temp
  say ($ppl$xlen) ($ppl$ylen) !prints "6.127 6.127"
ppl fill
 
set view myur
fill/k=1/l=1/set temp
  say ($ppl$xlen) ($ppl$ylen) !prints "6.081 6.081"
ppl fill
!!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<