[GRASS-user] vector works in X0 monitor but not in gis.m

[Glynn Clements]

Hamish wrote:

> > I imported an arc coverage into a polyconic projection and I'm able to
> > see the vectors when using the X0 monitor (d.vect command) but, when I
> > try to use the gis.m canvas, the following error appears in the Output
> > GIS.m screen
> > 
> > ---------------------------------------------------------------------
> > region for current mapset line 1: <projection:99 (Polyconic > run "g.region"
> > ---------------------------------------------------------------------
> > 
> > And nothing gets drawn. Funny is that I can query the canvas with the
> > mouse and see the vector attributes, meaning that the monitor extent
> > is correct.
> > 
> > g.region -p output is:
> > 
> > projection: 99 (Polyconic (American))
> ..
> > BTW, using grass 6.2.1 from Debian repos
> 
> 
> Looks like a quoting bug in the GUI. (gets cut at second "(")

Probably related to this in mapcanvas.tcl:

		# Finally put this into wind file format to use with GRASS_REGION
		regexp -nocase {^.* (\(.*\))} $parts(projection) trash end
		set parts(projection) [string trim $parts(projection) $end]


The "*" operator will try to match as much as possble, so matching the
string "99 (Polyconic (American))" against the regexp"^.* (\(.*\))"
will result in the ".*" matching ""99 (Polyconic " and the "(\(.*\))"
matching "(American))", so "end" will be set to "American)"

Also, using "string trim" here is bogus; it discards any leading or
trailing section consisting of characters in the specified string,
which may be more than just the string itself (if $end contains the
digit 9, it will strip the projection code).

It should probably just match the portion that it wants, e.g.:

	regexp -nocase {^([0-9]+)} $parts(projection) trash parts(projection)

rather than trying to match and discard the portion that it doesn't
want.

-- 
Glynn Clements <glynn at gclements.plus.com>