HAM: A PHYSICS SIMULATION FRAMEWORK

Ham is a physics simulation framework that takes a Lagrangian of a
system and a description of how to render it and produces a real-time,
Hamiltonian-based simulation of the system.  It uses Maxima for the
symbolic mathematics and SDL2 for the graphics.

For example, for a simple harmonic oscillator:

	(define-simulation simple-harmonic-oscillator
	  :lagrangian (- (* 1/2 m (^ (dot q) 2)) (* 1/2 k (^ q 2)))
	  :coords (q)
	  :render (translate (* q 100) 0 (circle 20 0 0))
	  :start (q 1.0 p_q 0.0)
	  :params (m 1.0 k 2.0))

To then run the simulation:

	(make-instance 'simple-harmonic-oscillator)


								SETUP

Before the ASDF system can be loaded, you must build the Maxima
sources locally and install them into a directory (I couldn't get
Maxima's ASDF system to load successfully otherwise, though I'm not
entirely sure why this fixes it).  This can be done with:

	cd maxima
	mkdir $PWD-install
	./bootstrap
	./configure --prefix=$PWD-install
	make -j
	make install

I'll try to figure out if this step itself can be done with ASDF at
some point ;)

Once that's done you should be able to load the system with
(asdf:load-system :ham), given that the sources are in your ASDF
registry.  The system also uses :sdl2, so make sure that's available
-- you can get it with (ql:quickload :sdl2) if you're so inclined.