points.c

Go to the documentation of this file.

#include <math.h>
#include "points.h"
 
 
Point Point_sub( Point p, Point q )
{
  p.x[ 0 ] -= q.x[ 0 ]; 
  p.x[ 1 ] -= q.x[ 1 ]; 
  return p;
}
 
Point Point_add( Point p, Point q )
{
  p.x[ 0 ] += q.x[ 0 ]; 
  p.x[ 1 ] += q.x[ 1 ]; 
  return p;
}
 
Point Point_mul( double c, Point p )
{
  p.x[ 0 ] *= c;
  p.x[ 1 ] *= c;
  return p;
}
 
double Point_dot( Point p, Point q )
{
  return p.x[ 0 ] * q.x[ 0 ] + p.x[ 1 ] * q.x[ 1 ];
}
 
double Point_norm2( Point p )
{
  return Point_dot( p, p );
}
 
double Point_norm( Point p )
{
  return sqrt( Point_norm2( p ) );
}
 
double Point_distance( Point p, Point q )
{
  return distance( p.x[ 0 ], p.x[ 1 ], q.x[ 0 ], q.x[ 1 ] );
}
 
Point Point_normalize( Point p )
{
  return Point_mul( 1.0/Point_norm( p ), p );
}
 
static int compteur_distance = 0;
 
double distance( double x1, double y1, double x2, double y2 )
{
  ++compteur_distance;
  return sqrt( (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2) );
}
 
void resetCompteurDistance(void)
{
  compteur_distance = 0;
}
 
int getCompteurDistance(void)
{
  return compteur_distance;
}