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/*****************************************************************
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m2d_int_triangle.c Type:Func
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un point est il dans le triangle
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Date de creation : Wed May 1 18:21:18 1996
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Derniere version : Tue Apr 22 12:25:16 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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int m2d_int_triangle(int n1,int n2,int n3,int n)
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{
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struct s_noeud *ac_no1,*ac_no2,*ac_no3,*ac_no;
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float u1,u2,u3,u4,v1,v2,v3,v4;
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float eps,delta,du,dv;
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float xsi,eta;
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ac_no1=ADRESSE(n1,noeud,mesh->);
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ac_no2=ADRESSE(n2,noeud,mesh->);
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ac_no3=ADRESSE(n3,noeud,mesh->);
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ac_no=ADRESSE(n,noeud,mesh->);
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if (mesh->rev_u!=0.) du=0.5*mesh->rev_u-ac_no1->u; else du=0.;
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if (mesh->rev_v!=0.) dv=0.5*mesh->rev_v-ac_no1->v; else dv=0.;
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eval_decale(&u1,du,ac_no1->u,U);
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eval_decale(&v1,dv,ac_no1->v,V);
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eval_decale(&u2,du,ac_no2->u,U);
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eval_decale(&v2,dv,ac_no2->v,V);
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eval_decale(&u3,du,ac_no3->u,U);
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eval_decale(&v3,dv,ac_no3->v,V);
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eval_decale(&u4,du,ac_no->u,U);
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eval_decale(&v4,dv,ac_no->v,V);
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eps=0.0001;
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delta=(u2-u1)*(v3-v1)-(v2-v1)*(u3-u1);
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if (EGAL(delta,0.0,eps)) return(0);
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xsi=1.0/delta*((v3-v1)*(u4-u1)-(u3-u1)*(v4-v1));
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eta=1.0/delta*((u2-u1)*(v4-v1)-(v2-v1)*(u4-u1));
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if((eta > eps) && (xsi > eps) && ((eta+xsi) < 1.0-eps)) return(1);
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else return(0);
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}
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