particules.c

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#include <assert.h>
#include <stdlib.h>
#include <math.h>
#include "particules.h"
 
void initParticule( Particule* p, double x, double y, double vx, double vy,
                double m )
{
  p->x[0] = x;
  p->x[1] = y;
  p->v[0] = vx;
  p->v[1] = vy;
  p->f[0] = 0.0;
  p->f[1] = 0.0;
  p->m = m;
}
 
void TabParticules_init( TabParticules* tab )
{
  tab->taille = 10;
  tab->nb = 0;
  tab->particules = (Particule*) malloc( tab->taille * sizeof( Particule ) );
}
 
void TabParticules_ajoute( TabParticules* tab, Particule p )
{
  if ( tab->nb == tab->taille )
    TabParticules_agrandir( tab );
  tab->particules[ tab->nb++ ] = p;
}
 
void TabParticules_set( TabParticules* tab, int i, Particule p )
{
  assert ( i < tab->nb );
  tab->particules[ i ] = p;
}
 
Particule TabParticules_get( TabParticules* tab, int i )
{
  assert ( i < tab->nb );
  return tab->particules[ i ];
}
 
Particule* TabParticules_ref( TabParticules* tab, int i )
{
  assert ( i < tab->nb );
  return tab->particules + i;
}
 
int TabParticules_nb( TabParticules* tab )
{
  return tab->nb;
}
 
void TabParticules_termine( TabParticules* tab )
{
  if ( tab->particules != NULL ) free( tab->particules );
  tab->taille = 0;
  tab->nb = 0;
  tab->particules = NULL;
}
 
void TabParticules_agrandir( TabParticules* tab )
{
  int new_taille = 2*tab->taille;
  Particule* new_pts = (Particule*) malloc( new_taille * sizeof( Particule ) );
  for ( int i = 0; i < tab->nb; ++i )
    new_pts[ i ] = tab->particules[ i ];
  free( tab->particules );
  tab->particules = new_pts;
  tab->taille = new_taille;
}
 
void TabParticules_supprime_dernier( TabParticules* tab )
{
  assert( tab->nb > 0 );
  --tab->nb;
}
 
void TabParticules_supprime( TabParticules* tab, int i )
{
  assert ( i >= 0 );
  assert ( i < tab->nb );
  tab->particules[ i ] = tab->particules[ --tab->nb ];
}