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/*****************************************************************
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geo_ind_point_edge.cpp Type:Func
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Calcul de l indice d un point sur une edge
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Date de creation : 19-9-1997 18 :27 :20
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Derniere version : 19-9-1997 18 :27 :20
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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 <stdlib.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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/**************************/
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/* programme principal */
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float geo_ind_point_edge(struct s_edge *edge,struct s_noeud *no)
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{
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struct s_straight *straight;
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struct s_ellipse *ellipse;
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float xtmp,ytmp,ztmp,tt,vec[4],t[4];
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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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t[0]=no->x-straight->param->root[0];
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t[1]=no->y-straight->param->root[1];
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t[2]=no->z-straight->param->root[2];
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PVEC(vec,t,straight->param->dir);
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NORME(vec);
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if (EGAL(vec[3],0.,0.0001))
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{
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if (!(EGAL(straight->param->dir[0],0.0,0.0001))) tt=t[0]/straight->param->dir[0];
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else if (!(EGAL(straight->param->dir[1],0.0,0.0001))) tt=t[1]/straight->param->dir[1];
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else tt=t[2]/straight->param->dir[2];
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}
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return(tt);
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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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xtmp=ellipse->param->u[0]*(no->x-ellipse->param->centre[0])+ellipse->param->u[1]*(no->y-ellipse->param->centre[1])+ellipse->param->u[2]*(no->z-ellipse->param->centre[2]);
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ytmp=ellipse->param->v[0]*(no->x-ellipse->param->centre[0])+ellipse->param->v[1]*(no->y-ellipse->param->centre[1])+ellipse->param->v[2]*(no->z-ellipse->param->centre[2]);
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ztmp=ellipse->param->w[0]*(no->x-ellipse->param->centre[0])+ellipse->param->w[1]*(no->y-ellipse->param->centre[1])+ellipse->param->w[2]*(no->z-ellipse->param->centre[2]);
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t[0]=xtmp/ellipse->param->a;
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t[1]=ytmp/ellipse->param->b;
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t[2]=t[0]*t[0]+t[1]*t[1];
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if (EGAL(ztmp,0.0,0.0001))
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if (EGAL(t[2],1.,0.0001))
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{
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if (t[0]<(-1.)) t[0]=(-1);
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if (t[0]>1.) t[0]=1;
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tt=(float)acos((double)t[0]);
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if (t[1]<0.) tt=(-tt);
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if (tt<0.) tt=tt+2*PI;
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if (tt<edge->t1) tt=tt+2*PI;
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}
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return(tt);
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}
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return(tt);
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}
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