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/*****************************************************************
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eval_mindis_face.cpp Type:Func
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Calcul la distance minimum entre une entite et un point
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Date de creation : 2-2-1999 10 :25 :59
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Derniere version : 2-2-1999 10 :25 :59
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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 <string.h>
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#include <math.h>
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#include "struct.h"
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#include "const.h"
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#include "prototype.h"
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/**************************/
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/* variables globales */
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extern struct s_acis *acis;
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/**************************/
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/* programme principal */
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void eval_mindis_face(struct s_face *face, float *x,float *dis, float *par)
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{
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float u,v,uu,vv;
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float g0,g1;
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int ok;
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float um,vm,eps,ud,vd,ua,va,lu,lv;
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if (face->rev_u==0.)
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{
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ud=face->uinf;
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ua=face->usup;
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}
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else
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{
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ud=0.;
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ua=face->rev_u;
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}
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if (face->rev_v==0.)
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{
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vd=face->vinf;
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va=face->vsup;
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}
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else
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{
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vd=0.;
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va=face->rev_v;
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}
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MINI(eps,0.0001*(ua-ud),0.0001*(va-vd));;
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MAXI(lu,3.*eps,0.0001*(ua-ud));
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MAXI(lv,3.*eps,0.0001*(va-vd));
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ok=0;
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do
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{
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um=(ud+ua)/2.;
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vm=(vd+va)/2.;
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u=um-eps;
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v=vm-eps;
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uu=um+eps;
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vv=vm+eps;
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g0=eval_dis_point_face(face,x,u,vm,FONCTION);
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g1=eval_dis_point_face(face,x,uu,vm,FONCTION);
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if (g0<g1) ua=uu;
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else ud=u;
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g0=eval_dis_point_face(face,x,um,v,FONCTION);
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g1=eval_dis_point_face(face,x,um,vv,FONCTION);
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if (g0<g1) va=vv;
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else vd=v;
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if ((ua-ud<lu) && (va-vd<lv) ) ok=1;
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}
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while (ok==0);
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par[0]=(ua+ud)/2.;
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par[1]=(va+vd)/2.;
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*dis=(float)sqrt((double)eval_dis_point_face(face,x,par[0],par[1],FONCTION));
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}
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