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/*****************************************************************
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eval_fdn1.c Type:Func
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Calcul de la fonction de densite pour approcher une courbe a epsilon
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Date de creation : Thu Nov 28 18:50:42 1996
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Derniere version : Tue Jun 3 13:32:09 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 <string.h>
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#include <math.h>
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#include <stdlib.h>
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#include "const.h"
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#include "struct.h"
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#include "memoire.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_param *para;
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extern struct environnement env;
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extern struct s_acis *acis;
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/**************************/
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/* programme principal */
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float eval_fdn1(struct s_edge *edge,float t)
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{
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float dens,dens1,dis,tt;
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struct s_edge *edge_tmp;
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struct s_straight *straight;
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struct s_ellipse *ellipse;
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float coord[3],l,vec[3],par[2];
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int i,j,num;
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dens=eval_fdn1_eps(edge,t);
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if (strcmp(acis->type_entite[edge->curve],"ellipse-curve")==0)
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{
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ellipse=(struct s_ellipse *)acis->entity[edge->curve];
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l=(ellipse->param->a+ellipse->param->b)/2.*edge->t2;
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}
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if (strcmp(acis->type_entite[edge->curve],"straight-curve")==0)
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{
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straight=(struct s_straight *)acis->entity[edge->curve];
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memcpy(vec,straight->param->dir,3*sizeof(float));
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NORME(vec);
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l=vec[3]*edge->t2;
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}
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if (edge->dens_influ==NULL)
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{
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/* les liaisons d influences des edges sont elles completes */
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for (j=0;j<acis->nb_edge;j++)
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{
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if (edge->rap_edge[j]==0)
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{
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edge_tmp=ADRESSE(j,edge,acis->);
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eval_mindis_edge_edge(edge_tmp,edge,&dis,par);
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/* validite de la recherche ???? */
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if ((dis<4*env.dens) && (edge_tmp!=edge))
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{
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edge->rap_edge[j]=1;
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edge_tmp->rap_edge[edge->num_edge]=1;
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}
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else
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{
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edge->rap_edge[j]=-1;
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edge_tmp->rap_edge[edge->num_edge]=-1;
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}
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}
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}
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num=(int)(l/env.dens+3);
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edge->nb_dens=num;
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edge->dens_influ=(float *)calloc(edge->nb_dens,sizeof(float));
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ERREUR_ALLOC(edge->dens_influ);
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for (j=0;j<edge->nb_dens;j++)
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{
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voir();
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edge->dens_influ[j]=l*10000.;
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eval_edge(edge,edge->t1+edge->t2*j/(edge->nb_dens-1),FONCTION,coord);
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for (i=0;i<acis->nb_edge;i++)
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{
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if (edge->rap_edge[i]==1)
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{
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edge_tmp=ADRESSE(i,edge,acis->);
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eval_mindis_edge(edge_tmp,coord,&dis,&tt);
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dens1=eval_fdn1_eps(edge_tmp,tt);
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MINI(edge->dens_influ[j],edge->dens_influ[j],(dens1+dis/4.));
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}
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}
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}
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}
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eval_edge(edge,t,FONCTION,coord);
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i=(int)floor((double)((t-edge->t1)*(edge->nb_dens-1)/edge->t2));
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if (i!=edge->nb_dens-1) dens1=(t-edge->t1-i*edge->t2/(edge->nb_dens-1))*(edge->dens_influ[i+1]-edge->dens_influ[i])*(edge->nb_dens-1)/edge->t2+edge->dens_influ[i];
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else dens1=edge->dens_influ[edge->nb_dens-1];
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MINI(dens,dens,dens1);
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return(dens);
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}
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