#!/bin/bash
#xplanet-gnome.sh shell script v0.3
#shows Earth on your Gnome desktop with current lighting conditions,i.e. day and night
#From: http://stef.tvk.rwth-aachen.de/~nazgul/linux-hacks.php

#It also retrieves an updated cloudmap using clouds.pl script
#From: cueSim Ltd.   http://www.cueSim.com, Bedford, UK

#Finally saves numbered secuential images to satisfy levhita's animation needs.
#FROM: http://blog.levhita.net

DELAY=15m
PREFIX=/home/levhita/packages/xplanet/
APPEND=2
#Use .png for better quality, this is the one that'll be set as background
EXT=.png

GEOMETRY=1280x1024
#Default: Guadalajara, Jalisco. México.
LONGITUDE=-103
LATITUDE=20
#Default is no projection,i.e. render a globe
#rectangular is the flat world map. also try ancient, azimuthal,  mercator,..
#PROJECTION=mercarto

#Saves every render in date numbered file, default: no saving
SAVE_SECUENCE=0
#Secuenced files prefix
SECUENCED=secuence
#To save some hard disk(around 10x magnitude) we convert the secuenced files to JPG
#set to 0 to disable
CONVERT_TO_JPG=1
#75 seems to be provide the best quality/size ratio (you are welcome to dissagre with me)
JPG_QUALITY=75
#To save some more hard disk you can resize the image, remove for no resize.
#Actually it only takes the second parameter, in order to mantain the aspect ratio.
#i.e. when geometry is set to 1280x1024,
# 800x600 goes to 750x600
# 640x480 goes to 600x480
RESIZE=800x600

#Enters installation dir
cd $PREFIX

while [ 1 ]
do
  OUTPUT=xplanet
  
  #Retrieve the last avaliable cloudmap, only every 3 ours, used to avoid
  #bandwidth waste on the mirrors
  ./clouds.pl
  
  #rename background image so Gnome realises image has changed - thx to dmbasso
  if [ -e "$PREFIX$OUTPUT$EXT" ]; then
     rm "$PREFIX$OUTPUT$EXT"
     OUTPUT="$OUTPUT$APPEND"
  else
     rm "$PREFIX$OUTPUT$APPEND$EXT"
  fi
  
  if [ -z $PROJECTION ]; then 
    xplanet -num_times 1 -output "$PREFIX$OUTPUT$EXT" -geometry $GEOMETRY -longitude $LONGITUDE -latitude $LATITUDE -config config.txt -fov .2
  else
    xplanet -num_times 1 -output "$PREFIX$OUTPUT$EXT" -geometry $GEOMETRY -longitude $LONGITUDE -latitude $LATITUDE -projection $PROJECTION -config config.txt -fov .2
  fi
  
  #update Gnome background
  gconftool -t str -s /desktop/gnome/background/picture_filename "$PREFIX$OUTPUT$EXT"
  
  #Saves and convert to JPG (if requested) the file in a date secuenced file
  if [ "$SAVE_SECUENCE" == "1" ]; then
    DATE=$(date +%Y%m%d%H%M%S)
    if [ "$CONVERT_TO_JPG" == "1" ]; then
      if [ -z $RESIZE ]; then
        mogrify -format jpg -quality $JPG_QUALITY% $PREFIX$OUTPUT$EXT
      else
        mogrify -resize $RESIZE -format jpg -quality $JPG_QUALITY% $PREFIX$OUTPUT$EXT
      fi
      mv $PREFIX$OUTPUT.jpg $PREFIX$SECUENCED$DATE.jpg
      echo "Converting and saving $PREFIX$SECUENCED$DATE.jpg"
    else
      cp "$PREFIX$OUTPUT$EXT" "$PREFIX$SECUENCED$DATE$EXT"
      echo "Saving $PREFIX$SECUENCED$DATE$EXT"
    fi
  fi
  sleep $DELAY
done