[GRASS-user] Label difficulties

[Adam Dershowitz]

On Aug 29, 2007, at 2:50 AM, Hamish wrote:

> Hamish wrote:
>>> maybe a way to process the text string with formatting codes to
>>> newlines automatically? (tcl is string friendly, so search and
>>> replace shouldn't  be too hard, although I've no idea how)
>
> Ivan wrote:
>>         It's rather simple:
>>
>> % set a {1\n2}
>> 1\n2
>> % subst -nocommands -novariables $a
>> 1
>> 2
>> %
>
>
> Thanks Ivan, that works! Applied in 6.3cvs.
>
> The border box still needs to be updated to count the number of  
> lines in
> the string and adjust the background box width and height  
> accordingly. For
> now you can just turn off the background box.
>
> Bug: I notice that if you try and change the PS label background box
> color or font color it just gets reset when you redraw the display.
>
> I've little idea about Tcl/Tk so I must leave these small tasks for
> someone else. The "sample" label file that comes with Spearfish has a
> \n newline in it to test with.
>
> I would hold off backporting the fixes to the 6.2.x branch until it is
> all working in 6.3cvs, then do it as a single patch.
>

>

Hamish,
you and a few others suggested that I could use r.blend.  Initially  
it did not work as expected.  It  turns out that my top map was  
smaller than my basemap and that r.blend was still blending beyond  
the border of the top map, so that the bottom map looked washed out.   
I ended up editing r.blend to make it work as I expected.  I am not  
sure who this should go to, but let me suggest the following change  
to r.blend:
Replace this:
r.mapcalc "$GIS_OPT_OUTPUT.r = r#$GIS_OPT_FIRST * .$GIS_OPT_PERCENT +  
(1.0 - .$GIS_OPT_PERCENT) * r#$GIS_OPT_SECOND"
r.mapcalc "$GIS_OPT_OUTPUT.g = g#$GIS_OPT_FIRST * .$GIS_OPT_PERCENT +  
(1.0 - .$GIS_OPT_PERCENT) * g#$GIS_OPT_SECOND"
r.mapcalc "$GIS_OPT_OUTPUT.b = b#$GIS_OPT_FIRST * .$GIS_OPT_PERCENT +  
(1.0 - .$GIS_OPT_PERCENT) * b#$GIS_OPT_SECOND"

with this:

r.mapcalc "$GIS_OPT_OUTPUT.r = if(isnull($GIS_OPT_FIRST),r# 
$GIS_OPT_SECOND, r#$GIS_OPT_FIRST * .$GIS_OPT_PERCENT + (1.0 - . 
$GIS_OPT_PERCENT) * r#$GIS_OPT_SECOND)"
r.mapcalc "$GIS_OPT_OUTPUT.g = if(isnull($GIS_OPT_FIRST),g# 
$GIS_OPT_SECOND, g#$GIS_OPT_FIRST * .$GIS_OPT_PERCENT + (1.0 - . 
$GIS_OPT_PERCENT) * g#$GIS_OPT_SECOND)"
r.mapcalc "$GIS_OPT_OUTPUT.b = if(isnull($GIS_OPT_FIRST),b# 
$GIS_OPT_SECOND, b#$GIS_OPT_FIRST * .$GIS_OPT_PERCENT + (1.0 - . 
$GIS_OPT_PERCENT) * b#$GIS_OPT_SECOND)"

That way, in places where the top map is null it just leaves the  
bottom map alone.

Is there a particular developer or other list that this suggestion  
should be sent to?

Again, thanks for the help, and I do now have things working as I need.