[CentOS] Looking for Linux variant of chairgun

[John R Pierce]

Rudi Ahlers wrote:
> Hi, 
>
> Does anyone know of a good Linux alternative to Chairgun 
> (http://www.chairgun.com/), which is used with air riffles?

should be pretty easy to reproduce the math in something like Gnu Octave.

    y = y0 + x * tan(theta) - g*x^2/(2*(v*cos(theta))^2)

gives height Y at distance X for initial velocity v and firing angle 
theta.   etc etc.   there are heuristics for approximating air friction 
(ignored in the above equation), see
http://en.wikipedia.org/wiki/Ballistic_coefficient
and
http://en.wikipedia.org/wiki/Trajectory_of_a_projectile#Trajectory_of_a_projectile_with_air_resistance

for more detailed math...