GMT with custom curved arrows

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1

I’ve been working on a program, vfplot, which creates EPS files of curved arrows (representing a 2-d vector field). The program plots only the arrows, GMT can do the rest of the work needed to make an attractive plot.

vfplot-rotcyl
vfplot-rotcyl600×601 193 KB

Created with

 #!/bin/sh

set -e

EXT='0.03125'
RNG="-R-$EXT/$EXT/-$EXT/$EXT"
DIM='4i/4i'
PRJ="-JX$DIM"

EPS='compose.eps'

# background scaler

GRD='/tmp/scalar-fine.grd'
grdsample grd/scalar.grd -G$GRD $RNG -I1024+n
grdimage $GRD $PRJ $RNG -Cscalar.cpt -K > $EPS
rm -f $GRD

# central cylinder

psxy $PRJ $RNG -Sc1.27i -G255 -W1p -K -O >> $EPS <<EOF
0 0
EOF

# vfplot output

psimage vfplot.eps -W$DIM -Dx0/0 -O >> $EPS

# results

psconvert -A -Tf $EPS
psconvert -A -E150 -Tg $EPS

# cleanup

rm -r $EPS

Other examples here, follow the GitLab links to inspect the GMT scripts compose.sh

1 Like
2

Very cool.

  • Can you make a minimal working example to dodge grdsample [ERROR]: Cannot find file grd/scalar.grd?
  • You may want to prefix the gmt commands with gmt(?).
3

Those files can be found on GitLab

4

Thanks!

5

GMT can also plot curved arrows via -Sm if you compute the radius required. I had plans to do that to draw flow lines.

6

These are curved arrow heads, which we do not do. Unf GPL’ed.

7

If GMT were to want some components from vfplot, I’m open to relicensing those LGPL, just ask :slight_smile:

8

Thanks, we may go there (they look nice), but not for now.

9

We do curved vector heads -Sm