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/*****************************************************************
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m2d_cal_qual.c Type:Func
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Calcul de la qualite d un triangle
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Date de creation : Wed Mar 6 16:25:11 1996
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Derniere version : Tue Apr 22 12:03:24 1997
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Vincent FRANCOIS
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*****************************************************************/
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/**************************/
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/* include */
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#include <stdio.h>
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#include <math.h>
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#include "const.h"
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#include "memoire.h"
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#include "struct.h"
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#include "prototype.h"
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/**************************/
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/* variables globales */
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extern struct environnement env;
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extern struct s_mesh *mesh;
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/**************************/
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/* programme principal */
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float m2d_cal_qual(int n1,int n2,int n3)
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{
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struct s_noeud *no1,*no2,*no3;
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float vec12[3],vec13[3],vec23[3];
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float d12,d13,d23,dmax,crit,p;
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no1=ADRESSE(n1,noeud,mesh->);
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no2=ADRESSE(n2,noeud,mesh->);
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no3=ADRESSE(n3,noeud,mesh->);
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VEC(vec12,no1,no2);
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VEC(vec13,no1,no3);
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VEC(vec23,no2,no3);
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d12=PSCA(vec12,vec12);
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d13=PSCA(vec13,vec13);
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d23=PSCA(vec23,vec23);
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d12=(float)sqrt((double)d12);
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d13=(float)sqrt((double)d13);
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d23=(float)sqrt((double)d23);
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MAXI(dmax,d12,d13);
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MAXI(dmax,dmax,d23);
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p=0.5*(d12+d13+d23);
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crit=(p-d12)*(p-d13)*(p-d23)/p;
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crit=(float)sqrt((double)crit);
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crit=crit/dmax;
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crit=crit*3.4641101614;
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return(crit);
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}
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