I’m making a movie that should simply draw a line (in plot you would simply use -W). But I’m having troubles with this. These are just pairs of x,y,time. Do I need to use trajectories?
Now I’m just plotting the points as small red filled circles, which gives the impression of a line. There must be a (simple) better way?
Too late tonight but see events -A
When you say pairs of x,y,time you only have lines from A(t1) to B(t2), i.e., a series of not connected line segments? Or do you really have cruises or tracks like
x1, y1, t1
x2, y2, t2
x3, y3, t3
…
If you want to show the growth of that line of a section of it through time then, yes, you need to look at -A.
It’s a cruise track, so lat lon time. One long connected segment.
Here’s a minimal script creating the animation included.
# stuff to gmt events (ship track)
cat <<eof > long-lat-time.gmt
010:56.48643 78:06.99576 2009-05-09T204347.13
010:56.47279 78:06.99634 2009-05-09T204348.13
010:56.45915 78:06.99693 2009-05-09T204349.13
010:56.44551 78:06.99752 2009-05-09T204350.13
010:56.43190 78:06.99816 2009-05-09T204351.13
010:56.41830 78:06.99890 2009-05-09T204352.13
010:56.40475 78:06.99976 2009-05-09T204353.13
010:56.39106 78:07.00070 2009-05-09T204354.13
010:56.37716 78:07.00161 2009-05-09T204355.13
010:56.36329 78:07.00245 2009-05-09T204356.13
010:56.34951 78:07.00316 2009-05-09T204357.13
010:56.33591 78:07.00375 2009-05-09T204358.13
010:56.32262 78:07.00429 2009-05-09T204359.13
010:56.30921 78:07.00484 2009-05-09T204400.13
010:56.29570 78:07.00551 2009-05-09T204401.13
010:56.28198 78:07.00625 2009-05-09T204402.13
010:56.26794 78:07.00706 2009-05-09T204403.13
010:56.25375 78:07.00785 2009-05-09T204404.13
010:56.23947 78:07.00858 2009-05-09T204405.13
010:56.22549 78:07.00929 2009-05-09T204406.13
eof
# common
start=2009-05-09T20:43:47
stop=2009-05-09T20:44:06
gmt math -o0 -T${start}/${stop}/1s T = times.txt
plot='gmt plot -JM010:56.36329/78:07.00245/15c -R0.1/0.05+uk -Wthick long-lat-time.gmt'
events='gmt events -B0 long-lat-time.gmt -T${MOVIE_COL0}'
# make the 'bad' version with FORMAT_CLOCK_IN hhmmss.xx
cat<<eof > main.sh
gmt begin
gmt set FORMAT_CLOCK_IN hhmmss.xx
$plot
$events -Sc0.1c -Gred
$plot -Y8c
$events -Ar
gmt end
eof
time gmt movie main.sh -Ncruise-animation -C20cx20cx100 -Fgif+l -Ttimes.txt -V -Z -D12
rm times.txt main.sh long-lat-time.gmt
Instead of filled red circles (lower box in animation, which when used in my full script looks like a line), I would like to actually draw a line. I thought -Ar would be correct, but it’s doesn’t do anything (upper box in animation).
You need to run events -Ardpi in a pre script, once, and then use the result with events in the movie. See animation 13 for inspiration.
Thanks Paul.
-Ardpi makes a file with more densely populated points, which can be used to create a ‘line’; so ‘lines’ in events are actually (small color filled) circles(?).
Yes
I think you already solve it. But, in anycase. I don’t know if you see this post. I thnk it could help you.