[GRASS-dev] Re: [bug #5454] (grass) projection units incorrectly pluralized

[Michael Barton]

I haven't thought through all the implications, but on the face of it this
sounds like a reasonable solution. If implemented, hopefully it would be
able to run without lockup (succeed or fail with warning) with the current
TclTk scripts until the GUI could be re-written for this.


On 2/5/07 12:06 AM, "Hamish" <hamish_nospam at yahoo.com> wrote:

> Paul Kelly via RT wrote:
>> I have fixed the "foots" bug now; see
>> http://grass.itc.it/pipermail/grass-commit/2007-January/026497.html
>> I will commit a temporary solution to the GUI freezing problem
>> (changing g.proj so it won't prompt for the datum info unless you ask
>> it to be interactive) shortly.
> 
> Idea:
> 
> It would create a new epsg=code[,n] option:
> 
>   g.proj -c location=newLocation epsg=####
> 
> It would exit with EXIT_FAILURE if the datum transform parm is ambiguous.
> 
> Here's the cunning part:
> 
> "epsg=####,n" would pick param 1,2,3,.. from the list.
> 
> "epsg=####,0" would print available options to stdout and exit with an
> EXIT_SUCCESS return code. If the EPSG code isn't found, it exits with
> EXIT_FAILURE. The output is in CSV or a parsable format a GUI could read
> & make into a nice GUI popup. Maybe with a header comment line for humans.
> 
> In the GUI:
> - user selects create new location with EPSG code $EPSG.
> 
> - gui runs "catch `g.proj epsg=$EPSG` > /dev/null"
> 
> - If exit code is 0, gui creates new location with:
>     "g.proj -c location=$LOCATION epsg=$EPSG"
> 
> - If exit code is 1, gui runs:
>     "g.proj epsg=$EPSG,0"  then parses the output and creates a new
>   GUI popup with radiobutton options generated from that. (see d.menu)
>   (If it fails again, EPSG code is bad)
> 
>   Once a parm is selected and [Create] is clicked, the popup runs
>     "g.proj -c location=$LOCATION epsg=$EPSG,$N"
> 
> 
> IMO this would be many many times better than forcing a value (you
> wouldn't even know better transform parms exist), and isn't a huge
> amount to code.
> 
> 
> 
> Hamish
> 
> 

__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton