Re: [ferret_users] how to insert scale

[Michael Cornelius Spillane <Mick.Spillane@xxxxxxxx>]

Hi All,

Executive Summary: Try the 3-line demo below.

	There is a pair of PPL Advanced Commands that may be of use in this  
situation: PPL %XAXIS and PPL %YAXIS (yes, that is a percent sign  
before the XAXIS and YAXIS). From their arguments and description in the
"Advanced Commands" section it appears their main purpose is to add  
extra axes to a plot as, for example, if one wanted to plot  
temperature and salinity versus depth and maybe use the lower axis for  
temperature and the upper one (or a vertically shifted) for salinity.  
The new axis defined by %XAXIS, which applies to subsequent info  
plotted, spans the full width of the previous plot but is just offset  
vertically.  If the purpose of the original questioner is to add an  
axis for visual purposes and NOT span the entire width or height, that  
would perhaps best be done in an overlay window.
	Here's a simple demo of PPL %XAXIS

!************ DEMO ***************
go ptest
ppl %xaxis/nouser 0,100,20,1,4,1,1,-1,0.15,(i3)
plot/o/vs/nolab/sym=88 80,0    ! the placement of the star shows the  
new x-axis is now in effect
!************************************

where the arguments are XLOW, XHIGH, XINC
Y (the vertical offset of the new x-axis - 1inch here because I  
specified nouser)
LINT (label interval of large tics)
XUNIT (allows scaling of axis label)
IPOS (-1 below, +1 above, 0 none)
CSIZE (Label height in inches)
FRMT (format for axis labels)

For the full description, see the Plot Plus User Guide. Note that  
there are other "goodies" in the PPL Advanced Command toolkit.

Mick
-------

On Aug 10, 2011, at 3:05 AM, Hein Zelle wrote:

> Dear Dessy Berlianty,
>
> > I would like to ask any help how to overlay a scale (from 0 - 1 km)  
> > in our plot image?
> > I would really appreciate for any suggestion about it.
>
> Could you tell us a little more about your plot?  What grid is your
> data defined on?  (show grid my_variable)
>
> If your data is defined on a grid which has km as units, then Ferret
> will automatically plot the grid along the axis borders.
> Alternatively you could draw a scale manually as Ryo Furue suggested.
> You could do this, for example, like this:
>
> ! select 2 points in your map which are 1 km apart, in a location
> ! which is suitable for drawing the scale.  I will take (-8.5,-9.2)  
> and
> ! (-7.5,-8.7) as an example, modify this according to your data and  
> grid.
>
> define axis /x=-10:10:0.5 my_x
> define axis /y=-10:10:0.5 my_y
>
> let pattern=sin(x[gx=my_x])+cos(y[gy=my_y])
> shade /pal=dark_land_sea pattern
>
> plot /vs/overlay/line/color=green/title="1 km" {-8.5, -7.5}, 
> {-9.2,-9.2}
> ! optional: add vertical "end" marks
> plot /vs/overlay/line/color=green/nolab {-8.5,-8.5},{-9.3,-9.1}
> plot /vs/overlay/line/color=green/nolab {-7.5,-7.5},{-9.3,-9.1}
>
>
> You can use the label command to put the text "1 km" inside the plot
> next to your scale, instead of below the plot using the standard  
> legend.
>
> Kind regards,
>
>    Hein Zelle
>
> --
>
> Dr. Hein Zelle
> Advisor Meteorology & Oceanography
>
> Tel:    +31 (0)527-242299
> Fax:    +31 (0)527-242016
> Email:  hein.zelle@xxxxxxxxxxxxx
> Web:    www.bmtargoss.com
>
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