Georg Muntingh wrote:
> I haven't tried it before, but I sneaked a peek and tried to extract
> the most important information from the website.
> 
> * The program seems to take a discretized vector field as input, and
> creates images from these.
> * Its functionality seems to be
>   - to plot pretty arrows that have a width, size and colour, and are
> curved along the vector field;
>   - to plot ellipses, which have something to with how much space
> there would be between arrows.
>   - has two placement strategies for the arrows:
>     1. hedgehog: the arrows are placed on a regular rectangular grid;
>     2. adaptive: the arrows are placed with a molecular dynamics
> (Lennard-Jones) simulation of their bounding ellipses.
>   - to make animations of these
> * It is a command line tool.
> * The output is in PostScript.

which can be converted to SVG, PDF and other vector formats with standard tools.
The files are small, typically a few tens of kilobytes.

> * The input can be
>   SAG : a simpel ASCII grid;
>   GRD2: a pair of GMT(1) grd (netCDF) files representing the
> components of the vector field;
>   GFS : a simulation file from the Gerris flow solver.

See:
http://gfs.sourceforge.net/wiki/index.php/Main_Page

Jaap




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