[Thread Prev][Thread Next][Index]

Re: Possible bug: polygon and ylimits/vlimits



Hi Russell,

Thanks for the report.

The incompatibility of POLYGON with reverse-oriented axes is already noted in
our bug list for version 5.22

Meantime, the work-arounds require you to actually reverse the data values
rather than just to flip the graphic. If your underlying data is gridded the
SAMPLE* family of functions can be used to reverse the index ordering.

Sorry there is not a completely quick fix.

    - steve

==============

Russell Fiedler wrote:

> I'm trying to make a plot of some polygons where the vertical axis is
> sigma. Naturally, I would like the polygons corresponding to dense regions
> to appear at the bottom of the plot (i.e. the vertical axis needs to be
> inverted)
>
> The qualifier /vlimits (and the deprecated /ylimits) appears to be able to
> flip a plot upside down if the increment is selected to be negative
>
> BUT whenever I try this I don't get the polygons plotted. The axes are
> fine but the plotting region is wrong. Ferret seems to be mightily
> confused...
>
> I've managed a partial work arond but it doesn't appear to work for our
> non ideal case.
>
> Any ideas...
>
> Modifying the example in the documentation
>
> yes? LET XTRIANGLE = YSEQUENCE({-1,0,1})
> yes? LET YTRIANGLE = YSEQUENCE({-1,1,-1})
> yes? LET XPTS = 180+30*RANDU(I[i=1:10])
> yes? LET YPTS = 30*RANDU(1+I[i=1:10])
>
> !this works fine
> yes? POLYGON XTRIANGLE+XPTS, YTRIANGLE+YPTS, I[I=1:10]
>
> ! no polygons
> yes? POLYGON/vlimits=2:30:-2 XTRIANGLE+XPTS, YTRIANGLE+YPTS, I[I=1:10]
>
> ! This is a work around for the example but I can't get it to work for my
> ! real case
>
> ! Multiply the y values by -1
>
> yes? POLYGON/vlimits=2:30:-2 XTRIANGLE+XPTS, (-1)*(YTRIANGLE+YPTS),
> I[I=1:10]
>
> Cheers,
> Russ Fiedler

--

                |  NOAA/PMEL               |  ph. (206) 526-6080
Steve Hankin    |  7600 Sand Point Way NE  |  FAX (206) 526-6744
                |  Seattle, WA 98115-0070  |  hankin@pmel.noaa.gov




[Thread Prev][Thread Next][Index]

Dept of Commerce / NOAA / OAR / PMEL / TMAP

Contact Us | Privacy Policy | Disclaimer | Accessibility Statement