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/*****************************************************************
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eval_distance.c Type:Func
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calcul d'une distance sur une surface
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Date de creation : Thu Feb 13 12:01:14 1997
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Derniere version : Wed May 7 12:17:04 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 "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 s_acis *acis;
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extern struct environnment env;
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extern struct s_mesh *mesh;
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/**************************/
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/* programme principal */
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float eval_distance(struct s_face *face,float u1,float v1,float u2,float v2,float du,float dv)
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{
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struct s_plane *plane;
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float up,vp,x,y,z,long_par,long_reel;
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int i;
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float ti,tii,t,u,v,e,f,g,terme1,terme2,terme3;
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plane=NULL;
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if (strcmp(acis->type_entite[face->surface],"plane-surface")==0)
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plane=(struct s_plane *)acis->entity[face->surface];
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long_par=(u2-u1)*(u2-u1)+(v2-v1)*(v2-v1);
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long_par=(float)sqrt((double)long_par);
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if (plane!=NULL) return(long_par);
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up=u2-u1;
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vp=v2-v1;
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long_reel=0.;
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for (i=0;i<PAS;i++)
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{
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ti=i*1./PAS;
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tii=(i+1)*1./PAS;
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t=0.8872983345*ti+0.1127016654*tii;
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u=u1+t*(u2-u1);
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v=v1+t*(v2-v1);
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e=eval_face(face,&u,&v,E,&x,&y,&z,du,dv);
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f=eval_face(face,&u,&v,F,&x,&y,&z,du,dv);
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g=eval_face(face,&u,&v,G,&x,&y,&z,du,dv);
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terme1=e*up*up+2*f*up*vp+g*vp*vp;
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terme1=(float)sqrt((double)terme1);
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t=0.5*ti+0.5*tii;
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u=u1+t*(u2-u1);
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v=v1+t*(v2-v1);
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e=eval_face(face,&u,&v,E,&x,&y,&z,du,dv);
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f=eval_face(face,&u,&v,F,&x,&y,&z,du,dv);
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g=eval_face(face,&u,&v,G,&x,&y,&z,du,dv);
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terme2=e*up*up+2*f*up*vp+g*vp*vp;
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terme2=(float)sqrt((double)terme2);
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t=0.8872983345*tii+0.1127016654*ti;
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u=u1+t*(u2-u1);
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v=v1+t*(v2-v1);
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e=eval_face(face,&u,&v,E,&x,&y,&z,du,dv);
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f=eval_face(face,&u,&v,F,&x,&y,&z,du,dv);
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g=eval_face(face,&u,&v,G,&x,&y,&z,du,dv);
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terme3=e*up*up+2*f*up*vp+g*vp*vp;
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terme3=(float)sqrt((double)terme3);
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long_reel=long_reel+0.55555556*terme1+0.8888888889*terme2+0.5555556*terme3;
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}
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long_reel=long_reel*0.5/PAS;
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return(long_reel);
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}
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