plot.gu

#set terminal wxt size 400, 600
set terminal pngcairo  transparent enhanced size 400, 600 

set xrang [ -10 : 50 ]
set yrang [ -10 : 90 ]

set style fill transparent solid .5 noborder
set style circle radius 2.5
unset key

do for [i=0:400] { 
    pic=sprintf('pic%05i.png', i )
    set output pic 
    plot "particle.txt" index i using 1:2 with circles lc rgb "#FFA500"
}

# Create movie with mencoder
ENCODER = system('which mencoder');
if (strlen(ENCODER)==0) print '=== mencoder not found ==='; exit
CMD = 'mencoder mf://*.png -mf fps=25:type=png -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell -oac copy -o sph.avi'
system(CMD)

# Create webm
ENCODER = system('which ffmpeg')
if (strlen(ENCODER)==0) print '=== ffmpeg not found, exit ==='; exit
CMD = 'ffmpeg -i sph.avi sph.webm'
system(CMD)

# Clear directory
system('rm *.png')