[GRASS-dev] d.histogram: x axis ticks labels fixed

[Michael Barton]

On Jan 27, 2008, at 3:55 AM, grass-dev-request at lists.osgeo.org wrote:

> Date: Sun, 27 Jan 2008 01:00:14 -0800 (PST)
> From: Hamish <hamish_b at yahoo.com>
> Subject: Re: [GRASS-dev] d.histogram: x axis ticks labels fixed
> To: Markus Neteler <neteler at osgeo.org>,	GRASS developers list
> 	<grass-dev at lists.osgeo.org>
> Message-ID: <889403.25171.qm at web45807.mail.sp1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Markus Neteler wrote:
>> the x axis ticks in d.histogram are often completey messed
>> up, especially for FP maps with range 0..1.0
>
> bug report for this:
>   http://intevation.de/rt/webrt?serial_num=1977
> (note Paul had posted a patch there some months ago)
>
>> I have hacked display/d.histogram/bar.c
>> -> line 116 etc
>> to get readable output for most FP maps (before there wasn't).
>
> I've done a quick test and it looks good. nice!
> Resizing the xmon window recalculates the tick placement, if you want
> to do a lot of testing quickly.
>
>> I have also added a fix (line 321) to enable FP number output for
>> small range maps, e.g. (NC OSGeo data set):
>
> If I convert elevation.dem to a 0.0-1.0 FP map, the x axis tick labels
> are all still "0". :(
>
> #spearfish
> r.mapcalc elev.norm="(elevation.dem - 1066.) / (1840-1066.)"
> d.histogram elev.norm
>
> Before we spend too much more time on this module, were there plans to
> reimplement the module as a wxPython program using one of the python
> plotting libs?

This is a good idea. But with the improvements to d.histogram, it's  
relatively low on my priority list over other modules like  
georectification (me), digitizing (Martin), overall improved  
stability (all of us), and NVIZ (who??).

Michael


>
> 'd.histogram -q' seems to be broken. (was a quiet flag removed from
> r.stats?)
>
>
> cheers,
> Hamish



____________________
C. Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

Phone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>