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/*****************************************************************
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r3d_dis.cpp Type:Func
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Discretisation partielle d une edge
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Date de creation : 13-8-1997 9 :47 :14
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Derniere version : 13-8-1997 9 :47 :14
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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 "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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extern struct s_maillage *maillage;
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extern struct s_acis *acis;
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/**************************/
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/* programme principal */
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struct s_segment *r3d_dis(struct s_edge *edge,struct s_noeud *no1,struct s_noeud *no2)
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{
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struct s_straight *straight;
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struct s_ellipse *ellipse;
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struct s_segment *seg;
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struct s_noeud *no,*noa,*nob;
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int j,num;
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float t,a,inf,dens,l,vec[4],coord[4];
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float ti,tii,aprec,tprec,limit;
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int n1,n2,n,noe,pointe;
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float pos1,pos2;
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if (no1==no2)
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{
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pos1=edge->t1;
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pos2=edge->t1+edge->t2;
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}
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else
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{
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pos1=no1->pos;
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pos2=no2->pos;
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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 (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*(pos2-pos1);
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}
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num=(int)fabs((double)((pos2-pos1)/PI*36))+1;
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for (j=0;j<num;j++)
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{
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dens=eval_fdn1(edge,pos1+j*1./num*(pos2-pos1));
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if (j==0) inf=dens;
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else if (dens<inf) inf=dens;
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}
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num=(int)(10*l/inf)+1;
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a=0.;
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for (j=0;j<num;j++)
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{
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ti=pos1+(pos2-pos1)*j/num;
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tii=pos1+(pos2-pos1)*(j+1)/num;
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t=0.7886751345*ti+0.2113248654*tii;
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eval_edge(edge,t,DERIVE,coord);
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a=a+(float)sqrt(coord[0]*coord[0]+coord[1]*coord[1]+coord[2]*coord[2])/eval_fdn1(edge,t);
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t=0.7886751345*tii+0.2113248654*ti;
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eval_edge(edge,t,DERIVE,coord);
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a=a+(float)sqrt(coord[0]*coord[0]+coord[1]*coord[1]+coord[2]*coord[2])/eval_fdn1(edge,t);
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}
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a=a*(pos2-pos1)/num/2.;
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n=(int)floor((double)a);
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if (a-floor((double)a)>0.5) n++;
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if (n<1) n=1;
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limit=a/(float)n;
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j=0;
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a=0.;
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n1=no1->num;
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for (noe=0;noe<n;noe++)
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{
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if (noe!=n-1)
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{
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while (a<limit)
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{
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aprec=a;
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tprec=tii;
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ti=pos1+(pos2-pos1)*j/num;
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tii=pos1+(pos2-pos1)*(j+1)/num;
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t=0.7886751345*ti+0.2113248654*tii;
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eval_edge(edge,t,DERIVE,coord);
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a=a+(pos2-pos1)/num/2.*(float)sqrt(coord[0]*coord[0]+coord[1]*coord[1]+coord[2]*coord[2])/eval_fdn1(edge,t);
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t=0.7886751345*tii+0.2113248654*ti;
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eval_edge(edge,t,DERIVE,coord);
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a=a+(pos2-pos1)/num/2.*(float)sqrt(coord[0]*coord[0]+coord[1]*coord[1]+coord[2]*coord[2])/eval_fdn1(edge,t);
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j++;
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}
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t=tprec+(tii-tprec)*(limit-aprec)/(a-aprec);
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NEW_ENTITE(no,noeud,mesh->);
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no->num=mesh->nb_noeud-1;
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eval_edge(edge,t,FONCTION,coord);
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no->x=coord[0];
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no->y=coord[1];
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no->z=coord[2];
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no->dens=env.dens;
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no->type=EDGE;
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no->num_ent=edge->num;
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no->pos=t;
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n2=no->num;
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}
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else n2=no2->num;
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NEW_ENTITE(seg,segment,mesh->);
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seg->num=mesh->nb_segment-1;
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seg->n1=n1;
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seg->n2=n2;
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seg->type=EDGE;
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seg->num_ent=edge->num;
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no=ADRESSE(seg->n1,noeud,mesh->);
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NEW_POINTEUR(pointe,segment,no->);
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no->segment[pointe]=seg;
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no=ADRESSE(seg->n2,noeud,mesh->);
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NEW_POINTEUR(pointe,segment,no->);
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no->segment[pointe]=seg;
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NEW_POINTEUR(pointe,segment,edge->);
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edge->segment[pointe]=seg;
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n1=n2;
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a=a-limit;
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noa=ADRESSE(seg->n1,noeud,mesh->);
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nob=ADRESSE(seg->n2,noeud,mesh->);
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VEC(vec,noa,nob);
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seg->longueur=(float)sqrt(PSCA(vec,vec));
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}
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return(seg);
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}
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