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dist.c
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Fri, Jan 17, 08:53

dist.c
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#include<stdio.h>
#include<math.h>
#include<fonction.h>
#include<constant.h>
#include<dimension.h>
#include<structure.h>
/****************************************************************/
/* nom: dist */
/* auteur: Jean-Paul Kneib */
/* date: 10/02/92 */
/* place: Toulouse */
/****************************************************************/
/* Euclidean distance between 2 points
* Global variables used :
* - none
*/
double dist(struct point A, struct point B)
{
double x, y;
x = A.x - B.x;
y = A.y - B.y;
return(sqrt(x*x + y*y));
}
/**************************************************************
* Global variables used :
* - none
*/
double dist2(struct point A, struct point B)
{
double x, y;
x = A.x - B.x;
y = A.y - B.y;
return(x*x + y*y);
}
/*
* Barycentre of a triplet/triangle -----------------------------
* A is a structure triplet that contains 3 structures point a,b and c
* Return value B is a point
*
* Global variables used :
* - none
*/
struct point barycentre(struct triplet *A)
{
struct point B;
B.x = (A->a.x + A->b.x + A->c.x) / 3.;
B.y = (A->a.y + A->b.y + A->c.y) / 3.;
return(B);
}
/*
* center of two points ----------------------------------------*/
struct point milieu(struct point *A, struct point *B)
{
struct point C;
C.x = (A->x + B->x) / 2.;
C.y = (A->y + B->y) / 2.;
return(C);
}
/*
* weighted center
* Global variables used :
* - none
*/
struct point wcenter(struct point A, double wa, struct point B, double wb)
{
struct point C;
double w;
w = wa + wb;
C.x = (wa*A.x + wb*B.x) / w;
C.y = (wa*A.y + wb*B.y) / w;
return(C);
}
/*
* barycenter of a list of points P
* n is the number of values in P
*
* Global variables used :
* - none
*/
struct point bcentlist(struct point *P, int n)
{
struct point B;
register int i;
B.x = B.y = 0.;
for (i = 0; i < n; i++)
{
B.x += P[i].x;
B.y += P[i].y;
}
B.x /= n;
B.y /= n;
return(B);
}

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