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/*****************************************************************
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eval_mindis_edge.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_edge(struct s_edge *edge, float *x,float *dis, float *par)
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{
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float t,tt;
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float g0,g1;
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int ok;
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float tm,eps,td,ta,lt;
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td=edge->t1;
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ta=edge->t1+edge->t2;
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eps=0.0001*(ta-td);
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MAXI(lt,3.*eps,0.0001*(ta-td));
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ok=0;
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do
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{
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tm=(td+ta)/2.;
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t=tm-eps;
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tt=tm+eps;
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g0=eval_dis_point_edge(edge,x,t,FONCTION);
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g1=eval_dis_point_edge(edge,x,tt,FONCTION);
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if (g0<g1) ta=tt;
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else td=t;
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if (ta-td<lt) ok=1;
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}
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while (ok==0);
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*par=(ta+td)/2.;
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*dis=(float)sqrt((double)eval_dis_point_edge(edge,x,*par,FONCTION));
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}
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