Satisfy constraints - than your object is from multiple atoms conected with constrains that these atoms keep shape or angle or something other rull.
take a look to http://graphics.cs.c...rs/jakobsen.htm
there is code samples, basic start making verlet system
Oh i made very big mistakes in move(), sorry, I was a little bit drunk that night
it should be:
vector2 vel=vec-last_vec;
last_vec = vec;
vec+=vel*air+acceleration;