Re: [ferret_users] graticules are not written in overlay-plots

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

Hi Martin,

I agree this would be good behavior, to be able to request graticule 
lines on an overlay plot.  The graticule lines are drawn at the time of 
drawing the plot axes, and those are only drawn on non-overlay plots to 
ensure that they are drawn just once.. If we draw plot axes multiple 
times, they start to show up as thicker and thicker lines when using the 
graphics libraries that we use for PyFerret.

It should be possible to add functionality so that perhaps 
SHADE/GRAT/OVER would force a re-drawing of the axes, or perhaps a 
setting would cause only the graticule lines to be drawn.

Ansley


On 1/27/2017 2:41 AM, Martin Schmidt wrote:
> Hello Ferreters,
>
> sometimes it is nice to overlay a shaded image with a filled image. 
> Graticules are useful too.
> Ferret offers this, but it needs tricks to get it working:
>
> For example:
> ferret
>         NOAA/PMEL TMAP
>         PyFERRET v7 (opt)
>         Linux 3.19.0-64-generic - 07/01/16
>         27-Jan-17 10:17
>
> yes? use coads_climatology
> yes? set region/x=0:100/y=-50:0
> yes? shade/l=1/grat sst
> fine
>
> yes? fill/over/l=1/grat sst
>
> not fine - graticules are lost in ocean areas. Is this eventually a bug?
>
> I see the point, that two separate plots produced with "shade" and 
> "fill" cover different regions (half a grid cell width?) and have 
> different axes.
> So I understand, that "grat" becomes silent, when "overlay" is 
> specified. But I think it would be reasonable to redraw the graticule 
> from the first plot that defines regions and axes, when another plot 
> is overlayed?
>
> There are several workarounds, i.e., using fill_xy, but as a wish, it 
> would be great to keep the graticules in overlayed plots, if "grat" is 
> specified.
>
> Best,
> Martin