void LaserCooledIon::velocity_scale(double dt) {
// Note that this routine is called with dt/2, so use
// of "dt" referring to the complete timestep requires
// multiplication by 2.
// double two_dt = 2.0*dt;
// Eqn. 3.6, undo friction term
Vector3D friction = get_friction();
this->Ion::kick(dt, friction);
// Eqn. 3.7
// vel_.z /= 1.0 + two_dt*dt*ionType_.beta/ionType_.mass;
vel_.z /= 1.0 + dt*ionType_.beta/ionType_.mass;
}
void slow_droite(map &map, player &pl)
{
int friction;
friction = get_friction(map, pl);
if (ok(map, pl))
{
if (pl._v.x > 0)
pl._v.x -= 0.001 * friction;
}
else
{
pl._v.x = 0;
}
}
void slow_gauche(map &map, player &pl)
{
int friction;
int cx, cy;
cx = pl._pos.x / 32;
cy = (pl._pos.y + 32) / 32;
friction = get_friction(map, pl);
if (ok(map, pl))
{
if (pl._v.x < 0)
pl._v.x += 0.001 * friction;
}
else
{
pl._v.x = 0;
}
}