| 1 |
/*****************************************************************
|
| 2 |
|
| 3 |
eval_fdn2a.c Type:func
|
| 4 |
|
| 5 |
Calcul de la densite en un point u,v pour un plan
|
| 6 |
|
| 7 |
Date de creation : Tue Feb 18 10:01:34 1997
|
| 8 |
|
| 9 |
Derniere version : Mon Jun 30 12:04:05 1997
|
| 10 |
|
| 11 |
|
| 12 |
|
| 13 |
|
| 14 |
|
| 15 |
|
| 16 |
|
| 17 |
|
| 18 |
|
| 19 |
|
| 20 |
|
| 21 |
Vincent FRANCOIS
|
| 22 |
|
| 23 |
*****************************************************************/
|
| 24 |
|
| 25 |
|
| 26 |
|
| 27 |
|
| 28 |
|
| 29 |
/**************************/
|
| 30 |
/* include */
|
| 31 |
#include <stdio.h>
|
| 32 |
#include <string.h>
|
| 33 |
#include <stdlib.h>
|
| 34 |
#include "const.h"
|
| 35 |
#include "memoire.h"
|
| 36 |
#include "struct.h"
|
| 37 |
#include "prototype.h"
|
| 38 |
|
| 39 |
|
| 40 |
/**************************/
|
| 41 |
/* variables globales */
|
| 42 |
extern struct environnement env;
|
| 43 |
extern struct s_mesh *mesh;
|
| 44 |
|
| 45 |
|
| 46 |
|
| 47 |
/**************************/
|
| 48 |
/* programme principal */
|
| 49 |
|
| 50 |
float eval_fdn2a(struct s_face *face,float u,float v)
|
| 51 |
{
|
| 52 |
float du,dv;
|
| 53 |
int *test_quad,*test_frontiere;
|
| 54 |
struct s_quadtree **liste,*quad_depart,*quad;
|
| 55 |
struct s_frontiere *fr;
|
| 56 |
int nb_liste,numseg,ok,i,j,pass,num;
|
| 57 |
float dis,u1,v1,u2,v2,p1,p2,eps,det,ui,vi,d,lg_min,dista[100],densi[100];
|
| 58 |
float nume,deno,dens,dismin,disref;
|
| 59 |
|
| 60 |
|
| 61 |
/* calcul du decalage local */
|
| 62 |
if (mesh->rev_u!=0.) du=0.5*mesh->rev_u-u; else du=0.;
|
| 63 |
if (mesh->rev_v!=0.) dv=0.5*mesh->rev_v-v; else dv=0.;
|
| 64 |
eval_decale(&u1,du,u,U);
|
| 65 |
eval_decale(&v1,dv,v,V);
|
| 66 |
u=u1;v=v1;
|
| 67 |
/* variable de recherche */
|
| 68 |
test_quad=(int *)calloc(mesh->nb_quadtree,sizeof(int));
|
| 69 |
ERREUR_ALLOC(test_quad);
|
| 70 |
liste=(struct s_quadtree **)calloc(mesh->nb_quadtree+1,sizeof(struct s_quadtree *));
|
| 71 |
ERREUR_ALLOC(test_quad);
|
| 72 |
test_frontiere=(int *)calloc(mesh->nb_frontiere,sizeof(int));
|
| 73 |
ERREUR_ALLOC(test_frontiere);
|
| 74 |
|
| 75 |
/* recherche des frontieres proche du point u,v */
|
| 76 |
nb_liste=0;
|
| 77 |
qu_rechercher(u-du,v-dv,0.,mesh->root,liste,&nb_liste);
|
| 78 |
quad_depart=liste[0];
|
| 79 |
MAXI(dis,quad_depart->t_u,quad_depart->t_v);
|
| 80 |
dis=dis/2.;
|
| 81 |
numseg=0;
|
| 82 |
ok=0;
|
| 83 |
disref=mesh->root->t_u*mesh->root->t_u+mesh->root->t_v*mesh->root->t_v;
|
| 84 |
while (ok==0)
|
| 85 |
{
|
| 86 |
nb_liste=0;
|
| 87 |
qu_rechercher(u-du,v-dv,dis,mesh->root,liste,&nb_liste);
|
| 88 |
pass=0;
|
| 89 |
for (i=0;i<nb_liste;i++)
|
| 90 |
{
|
| 91 |
quad=liste[i];
|
| 92 |
if (test_quad[quad->num]==0)
|
| 93 |
{
|
| 94 |
for (j=0;j<quad->nb_frontiere;j++)
|
| 95 |
{
|
| 96 |
fr=quad->frontiere[j];
|
| 97 |
if (test_frontiere[fr->num]==0)
|
| 98 |
{
|
| 99 |
test_frontiere[fr->num]=1;
|
| 100 |
eval_decale(&u1,du,fr->no1->u,LIBRE);
|
| 101 |
eval_decale(&v1,dv,fr->no1->v,LIBRE);
|
| 102 |
eval_decale(&u2,du,fr->no2->u,LIBRE);
|
| 103 |
eval_decale(&v2,dv,fr->no2->v,LIBRE);
|
| 104 |
p1=(u2-u1)*(u-u1)+(v2-v1)*(v-v1);
|
| 105 |
p2=(u1-u2)*(u-u2)+(v1-v2)*(v-v2);
|
| 106 |
eps=0.0001*(u1-u2)*(u1-u2)+0.0001*(v1-v2)*(v1-v2);
|
| 107 |
if ((p1>(-eps)) && (p2>(-eps)))
|
| 108 |
{
|
| 109 |
det=(u1-u2)*(u1-u2)+(v1-v2)*(v1-v2);
|
| 110 |
ui=(u1*(v2-v1)*(v2-v1)+(u1-u2)*(v2-v1)*(v1-v)+u*(u1-u2)*(u1-u2))/det;
|
| 111 |
vi=(v1*(u1-u2)*(u1-u2)+(u1-u2)*(v1-v2)*(u-u1)+v*(v1-v2)*(v1-v2))/det;
|
| 112 |
d=eval_distance(face,u,v,ui,vi,du,dv);
|
| 113 |
}
|
| 114 |
else d=0.5*(eval_distance(face,u,v,u1,v1,du,dv)+eval_distance(face,u,v,u2,v2,du,dv));
|
| 115 |
if (pass==0)
|
| 116 |
{
|
| 117 |
lg_min=d;
|
| 118 |
pass=1;
|
| 119 |
}
|
| 120 |
if (d<lg_min) lg_min=d;
|
| 121 |
if (d<4*(env.dens-0.5*(fr->no1->dens+fr->no2->dens)))
|
| 122 |
{
|
| 123 |
if (numseg<4)
|
| 124 |
{
|
| 125 |
dista[numseg]=d;
|
| 126 |
densi[numseg]=0.5*(fr->no1->dens+fr->no2->dens);
|
| 127 |
numseg++;
|
| 128 |
}
|
| 129 |
else
|
| 130 |
{
|
| 131 |
if (dista[0]<dista[1]) num=1; else num=0;
|
| 132 |
if (dista[num]<dista[2]) num=2;
|
| 133 |
if (dista[num]<dista[3]) num=3;
|
| 134 |
if (d<dista[num])
|
| 135 |
{
|
| 136 |
dista[num]=d;
|
| 137 |
densi[num]=0.5*(fr->no1->dens+fr->no2->dens);
|
| 138 |
}
|
| 139 |
}
|
| 140 |
}
|
| 141 |
}
|
| 142 |
}
|
| 143 |
test_quad[quad->num]=1;
|
| 144 |
}
|
| 145 |
}
|
| 146 |
dis=dis*1.25;
|
| 147 |
if (lg_min>4*env.dens) ok=1;
|
| 148 |
if (dis*dis>disref) ok=1;
|
| 149 |
}
|
| 150 |
|
| 151 |
free(test_quad);
|
| 152 |
free(test_frontiere);
|
| 153 |
free(liste);
|
| 154 |
if (numseg==0) dens=env.dens;
|
| 155 |
else
|
| 156 |
{
|
| 157 |
dismin=dista[0];
|
| 158 |
for (i=1;i<numseg;i++)
|
| 159 |
MINI(dismin,dismin,dista[i]);
|
| 160 |
nume=0.;
|
| 161 |
deno=0.;
|
| 162 |
for (i=0;i<numseg;i++)
|
| 163 |
{
|
| 164 |
nume=nume+(4*env.dens-dista[i])*densi[i];
|
| 165 |
deno=deno+4*env.dens-dista[i];
|
| 166 |
}
|
| 167 |
nume=nume+dismin*env.dens;
|
| 168 |
deno=deno+dismin;
|
| 169 |
dens=nume/deno;
|
| 170 |
}
|
| 171 |
return(dens);
|
| 172 |
}
|
