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/*****************************************************************
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m1d_param_ellipse Type:func
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Parametrage d'une ellipse
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Date de creation : Thu Nov 28 10:26:41 1996
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Derniere version : Fri May 30 15:31:30 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 <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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extern struct s_param *para;
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/**************************/
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/* programme principal */
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void m1d_param_ellipse(struct s_edge *edge,struct s_ellipse *ellipse)
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{
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struct s_point *p1,*p2;
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float vec[4],vec1[4],vec2[4],co,si,det;
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int num0,num1;
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if (edge->sense==0)
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{
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p1=edge->start_vertex->point;
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p2=edge->end_vertex->point;
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}
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else
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{
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p2=edge->start_vertex->point;
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p1=edge->end_vertex->point;
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}
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NEW_ENTITE(ellipse->param,par_ellipse,para->);
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memcpy(ellipse->param->centre,ellipse->center,3*sizeof(float));
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memcpy(vec,ellipse->major,3*sizeof(float));
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NORME(vec);
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ellipse->param->a=vec[3];
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ellipse->param->b=ellipse->ratio*vec[3];
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memcpy(ellipse->param->u,vec,3*sizeof(float));
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memcpy(vec,ellipse->normal,3*sizeof(float));
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NORME(vec);
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memcpy(ellipse->param->w,vec,3*sizeof(float));
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PVEC(ellipse->param->v,ellipse->param->w,ellipse->param->u);
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vec1[0]=p1->coord[0]-ellipse->center[0];
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vec1[1]=p1->coord[1]-ellipse->center[1];
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vec1[2]=p1->coord[2]-ellipse->center[2];
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vec2[0]=p2->coord[0]-ellipse->center[0];
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vec2[1]=p2->coord[1]-ellipse->center[1];
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vec2[2]=p2->coord[2]-ellipse->center[2];
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det=ellipse->param->b*ellipse->param->a*(ellipse->param->u[0]*ellipse->param->v[1]-ellipse->param->u[1]*ellipse->param->v[0]);
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if (EGAL(det,0.0,0.0001))
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{
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det=ellipse->param->b*ellipse->param->a*(ellipse->param->u[0]*ellipse->param->v[2]-ellipse->param->u[2]*ellipse->param->v[0]);
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if (EGAL(det,0.0,0.0001))
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{
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det=ellipse->param->b*ellipse->param->a*(ellipse->param->u[1]*ellipse->param->v[2]-ellipse->param->u[2]*ellipse->param->v[1]);
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num0=1;
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num1=2;
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}
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else
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{
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num0=0;
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num1=2;
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}
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}
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else
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{
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num0=0;
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num1=1;
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}
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co=(vec1[num0]*ellipse->param->b*ellipse->param->v[num1]-vec1[num1]*ellipse->param->b*ellipse->param->v[num0])/det;
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si=(vec1[num1]*ellipse->param->a*ellipse->param->u[num0]-vec1[num0]*ellipse->param->a*ellipse->param->u[num1])/det;
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if (co>1.) co=1.;
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if (co<(-1.)) co=(-1.);
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edge->t1=(float)acos((double)co);
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if (si<-0.0001) edge->t1=(-edge->t1);
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if (edge->t1<-0.0001) edge->t1=edge->t1+2*PI;
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co=(vec2[num0]*ellipse->param->b*ellipse->param->v[num1]-vec2[num1]*ellipse->param->b*ellipse->param->v[num0])/det;
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si=(vec2[num1]*ellipse->param->a*ellipse->param->u[num0]-vec2[num0]*ellipse->param->a*ellipse->param->u[num1])/det;
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if (co>1.) co=1.;
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if (co<(-1.)) co=(-1.);
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edge->t2=(float)acos((double)co);
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if (si<-0.0001) edge->t2=(-edge->t2);
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if (edge->t2<-0.0001) edge->t2=edge->t2+2*PI;
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edge->t2=edge->t2-edge->t1;
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if (edge->t2<0.0001) edge->t2=edge->t2+2*PI;
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}
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