[ferret_users] $ppl$yorg and friends

[Ryo Furue <furue@xxxxxxxxxx>]

Hi Ferret users,

I'm puzzled by the values of $ppl$xorg and $ppl$yorg .
I thought they represent the lower-left corner of the plot,
but apparently that's not always the case:

   set data levitus_climatology
   fill/k=1 temp
   LABEL/NOUSER ($ppl$xlen) ($ppl$ylen) 1 0 .2 hello
   LABEL/NOUSER ($ppl$xorg) ($ppl$yorg) 1 0 .2 hello
   LABEL/NOUSER 0 0 1 0 .2 hello

This plot seems to indicate that (0,0) is the lower-left corner
and ($ppl$xlen, $ppl$ylen) is the upper-right corner,
while $ppl$xorg and $ppl$yorg have strange values.
Is this a correct behavior?

Within the "set_up state", these variables have "correct" values:

   set data levitus_climatology
   fill/k=1/set temp
   ppl shakey ,,,,,,`($ppl$xorg)+($ppl$xlen)`,`($ppl$xorg)+($ppl$xlen)+0.3`,($ppl$yorg),`($ppl$yorg)+($ppl$ylen)`
   ppl fill
   
In this case, ($ppl$xorg, $ppl$yorg) is the lower-left corner and
($ppl$xorg + $ppl$xlen, $ppl$yorg + $ppl$ylen) is the upper-right one.

Or, are both behaviors correct?  If so, that means that our coordinate
system changes depending on whether we are in the "set_up state"
or out of it.

I'm using

  FERRET v6.3
  Linux(g77) 2.4.21-32 - 09/29/09
  7-Mar-10 12:57

Regards,
Ryo