Re: Hide outside labels

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Julien,
There's no easy answer for this in terms of Ferret commands; labeling is 
set up so that
labels can be placed anywhere in the plot window. 
The answer will probably be that you'll have to compute the amount of 
space available
in the plot box, using symbols like  PPL$XLEN, axis length in inches, 
and XAXIS_MIN
and XAXIS_MAX, which are the axis endpoints in user units (e.g. 
longitude).  Then
you would compute the distance from your desired location to the edge of 
the plot box.
The size of the text and function STRLEN would tell how much of the 
label will fit, and
SUBSTRING  shortens the strings as needed.

Users, does anyone do this general kind of thing?  Does anyone have 
scripts that compute
positions on the pages in terms of plot-axis lengths, converting between 
user units and inches,
and the size of string labels?  I imagine a few examples would be very 
helpful.

Ansley

Julien Demaria wrote:

> Ansley,
>
> Thanks for your answer,
>
> In fact I want use the mode ppl window off, but I need truncate cities 
> labels too when there are too long and has a part outside the 
> window... : example : at the end of your example :
>
> label 10, 53, -1, 0, 0.12 LONGLONGLABEL
>
> I need this because I generate labels from a big list of cities and I 
> cannot know if each label 'll overlap the window (depending on font, 
> size, ...).
>
> Thanks,
>
> Julien
>
> At 18:24 30/11/2004, Ansley Manke wrote:
>
> > Hi Julien,
> > You don't say what command you're using to plot your symbols, but 
> > with either
> > the PLOT/VS command or POLYGON command,  the PPL WINDOW OFF
> > command will set Ferret so it doesn't "window" the data, that is, 
> > clip it to the
> > edges of the plot box.  Try this example:
> >
> >   yes? go basemap x=-60:20 y=20:80 20
> >   yes? ppl window off
> >
> >   yes? let xpts =  {10,15,20,22,25}
> >   yes? let ypts =  {43,55,49,43,50}
> >   yes? plot/vs/over/nolab/color=red/sym=26 xpts, ypts
> >
> >   yes? let ypts =  {53,65,59,53,60}
> >   yes? go polymark poly/over/nolab/nokey/line/pal=green xpts, ypts, 
> > ,circle
> >
> > Julien Demaria wrote:
> >
> > > Hi,
> > >
> > > I need to display a list of cities names on my map with little cross 
> > > : when a cross is outside my map it is automatically hidden, but the 
> > > associated label is displayed...
> > > Are there tricks to automatically hide outside labels ?
> > >
> > > Thanks in advance,
> > >
> > > Julien