[GRASS5] [bug #2463] (grass) Link two monitors geographically and zoom/pan in both simultaneously

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2463
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Subject: Link two monitors geographically and zoom/pan in both simultaneously

Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: grass5.7.0

hello,  
 
I would be great if two (or more) monitors can be linked to each other and to zoom/pan in 
one would result the same in the other monitors or a rectangle would be placed to mark the 
region which is currently shown in mon x0 .  
 
This idea has been mentioned earlier and a short script is written by john Gillette (see 
below), perhaps that makes it easier to implement it in GRASS. 
 
thanks martin 
 
wegmann at biozentrum.uni-wuerzburg.de 
 
Hi Martin, 
 
I had a similar problem once and John was kind enough 
to send me this script. It links to grass displays 
monitors so, whaever you look at in X0, X1 will 
follow, like linking the displays geographically in 
ERDAS. 
Hope it helps, but don't thanks me, thanks John 
 
Cheers 
Daniel 
 
-------------------------------------------------- 
From:   "John Gillette" <JGillette at rfmd.com> 
To:     "Daniel Victoria" <daniel_victoria at yahoo.com>, 
"Sandro Klippel" <sandro.klippel at talha-mar.com.br>, 
"GRASSLIST" <grasslist at baylor.edu> 
         
 
try this: 
 
Select and then Erase x1 and then display what ever 
you want there. 
Select x0 and erase and display other info there. 
 
Run this script to either pan or zoom in x0.  After 
finishing 
the pan or zoom x1 will redraw it's contents at the 
same region 
thereby "following" what ever is done in x0. 
 
The disadvantage is that you can only do 1 pan or zoom 
at a time, 
i.e. not interactively. 
 
usage: 
 
script_name z   <- does zoom instead of pan 
script_name 
 
zooming and panning in x0.  x0 is selected at exit. 
 
Does this help? 
 
John 
 
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#!/bin/sh 
 
d.mon select=x1 
monitor1=`d.save -o` 
 
d.mon select=x0 
if [ "$1" = "z" ] 
 then  
   d.zoom 
 else 
   d.pan   
fi 
region=`g.region -g` 
 
d.mon select=x1 
d.erase 
g.region $region 
eval "$monitor1" 
 
d.mon select=x0 
 
exit 0 

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