set arrow 1 from xstart,ystart to xstart+dx,ystart+dy
set label 1 "5cm" at xstart+0.5*dx,ystart+0.5*dy
choose xstart,ystart to place the arrow at an appropriate place
and dx and dy to give the arrow length the required length.
Mathieu Peyréga wrote:
>
> Hello,
>
> I am using gnuplot in the following way :
>
> plot a map background using a country coastline datafile.
> plot a vector field at some latitude/longitude points on the map.
> Up to the point, everything is ok...
>
> My issue is to have a scaled sample for the vector field key...
>
> e.g. : I want to display a sample with for example "5 cm" displayed next
> to it, and the displayed length match a "5 cm" vector on the map... (not
> on the screen of course)
>
> What would be the better way to do that ?
>
> Regards,
>
> Mathieu
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