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#include "m_pd.h"
#include "math.h"
static t_class *masse_class;
typedef struct _masse {
t_object x_obj;
t_float pos_old_1, pos_old_2, Xinit;
t_float force, masse, dX;
t_float minX, maxX;
t_outlet *position_new, *vitesse_out, *force_out;
t_symbol *x_sym; // receive
unsigned int x_state; // random
t_float x_f; // random
} t_masse;
static int makeseed(void)
{
static unsigned int random_nextseed = 1489853723;
random_nextseed = random_nextseed * 435898247 + 938284287;
return (random_nextseed & 0x7fffffff);
}
static float random_bang(t_masse *x)
{
int nval;
int range = 2000000;
float rnd;
unsigned int randval = x->x_state;
x->x_state = randval = randval * 472940017 + 832416023;
nval = ((double)range) * ((double)randval)
* (1./4294967296.);
if (nval >= range) nval = range-1;
rnd=nval;
rnd-=1000000;
rnd=rnd/1000000.; //pour mettre entre -1 et 1;
return (rnd);
}
void masse_minX(t_masse *x, t_floatarg f1)
{
x->minX = f1;
}
void masse_maxX(t_masse *x, t_floatarg f1)
{
x->maxX = f1;
}
void masse_float(t_masse *x, t_floatarg f1)
{
x->force += f1;
}
void masse_bang(t_masse *x)
{
t_float pos_new;
if (x->masse > 0)
pos_new = x->force/x->masse + 2*x->pos_old_1 - x->pos_old_2;
else pos_new = x->pos_old_1;
pos_new = max(min(x->maxX, pos_new), x->minX);
pos_new += x->dX;
x->pos_old_1 += x->dX; // pour ne pas avoir d'inertie suplementaire du a ce deplacement
outlet_float(x->vitesse_out, x->pos_old_1 - x->pos_old_2);
outlet_float(x->force_out, x->force);
outlet_float(x->position_new, pos_new);
x->pos_old_2 = x->pos_old_1;
x->pos_old_1 = pos_new;
// x->force = 0;
x->force = random_bang(x)*1e-25; // avoiding denormal problem by adding low amplitude noise
x->dX = 0;
}
void masse_reset(t_masse *x)
{
x->pos_old_2 = x->Xinit;
x->pos_old_1 = x->Xinit;
x->force=0;
outlet_float(x->position_new, x->Xinit);
}
void masse_resetF(t_masse *x)
{
x->force=0;
}
void masse_dX(t_masse *x, t_float posX)
{
x->dX += posX;
}
void masse_setX(t_masse *x, t_float posX)
{
x->pos_old_2 = posX; // clear history for stability (instability) problem
x->pos_old_1 = posX;
x->force=0;
outlet_float(x->position_new, posX);
}
void masse_loadbang(t_masse *x)
{
outlet_float(x->position_new, x->Xinit);
}
void masse_set_masse(t_masse *x, t_float mass)
{
x->masse=mass;
}
static void masse_free(t_masse *x)
{
pd_unbind(&x->x_obj.ob_pd, x->x_sym);
}
void *masse_new(t_symbol *s, t_floatarg M, t_floatarg X)
{
t_masse *x = (t_masse *)pd_new(masse_class);
x->x_sym = s;
pd_bind(&x->x_obj.ob_pd, s);
x->position_new=outlet_new(&x->x_obj, 0);
x->force_out=outlet_new(&x->x_obj, 0);
x->vitesse_out=outlet_new(&x->x_obj, 0);
x->Xinit=X;
x->pos_old_1 = X;
x->pos_old_2 = X;
x->force=0;
x->masse=M;
x->minX = -100000;
x->maxX = 100000;
if (x->masse<=0) x->masse=1;
makeseed();
return (void *)x;
}
void masse_setup(void)
{
masse_class = class_new(gensym("masse"),
(t_newmethod)masse_new,
(t_method)masse_free,
sizeof(t_masse),
CLASS_DEFAULT, A_DEFSYM, A_DEFFLOAT, A_DEFFLOAT,0);
class_addcreator((t_newmethod)masse_new, gensym("mass"), A_DEFSYM, A_DEFFLOAT, A_DEFFLOAT,0);
class_addcreator((t_newmethod)masse_new, gensym("pmpd.mass"), A_DEFSYM, A_DEFFLOAT, A_DEFFLOAT,0);
class_addfloat(masse_class, masse_float);
class_addbang(masse_class, masse_bang);
class_addmethod(masse_class, (t_method)masse_set_masse, gensym("setM"), A_DEFFLOAT, 0);
class_addmethod(masse_class, (t_method)masse_setX, gensym("setX"), A_DEFFLOAT, 0);
class_addmethod(masse_class, (t_method)masse_dX, gensym("dX"), A_DEFFLOAT, 0);
class_addmethod(masse_class, (t_method)masse_reset, gensym("reset"), 0);
class_addmethod(masse_class, (t_method)masse_resetF, gensym("resetF"), 0);
class_addmethod(masse_class, (t_method)masse_minX, gensym("setXmin"), A_DEFFLOAT, 0);
class_addmethod(masse_class, (t_method)masse_maxX, gensym("setXmax"), A_DEFFLOAT, 0);
class_addmethod(masse_class, (t_method)masse_loadbang, gensym("loadbang"), 0);
}
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