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/*****************************************************************
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eval_ellipse.c Type:Func
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Evaluation d'un poirn sur une ellipse
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Date de creation : Thu Nov 28 11:44:05 1996
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Derniere version : Tue Apr 22 11:41:27 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 <math.h>
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#include "const.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_param *para;
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/**************************/
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/* programme principal */
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void eval_ellipse(struct s_par_ellipse *param,float t,int type,float *coord)
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{
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int n;
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if (type==FONCTION)
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{
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coord[0]=(float)(param->centre[0]+param->u[0]*param->a*cos((double)t)+param->v[0]*param->b*sin((double)t));
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coord[1]=(float)(param->centre[1]+param->u[1]*param->a*cos((double)t)+param->v[1]*param->b*sin((double)t));
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coord[2]=(float)(param->centre[2]+param->u[2]*param->a*cos((double)t)+param->v[2]*param->b*sin((double)t));
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}
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if (type==DERIVE)
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{
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coord[0]=(float)(-param->u[0]*param->a*sin((double)t)+param->v[0]*param->b*cos((double)t));
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coord[1]=(float)(-param->u[1]*param->a*sin((double)t)+param->v[1]*param->b*cos((double)t));
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coord[2]=(float)(-param->u[2]*param->a*sin((double)t)+param->v[2]*param->b*cos((double)t));
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}
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if (type==DERIVE_SECONDE)
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{
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coord[0]=(float)(-param->u[0]*param->a*cos((double)t)-param->v[0]*param->b*sin((double)t));
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coord[1]=(float)(-param->u[1]*param->a*cos((double)t)-param->v[1]*param->b*sin((double)t));
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coord[2]=(float)(-param->u[2]*param->a*cos((double)t)-param->v[2]*param->b*sin((double)t));
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}
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if (type==ZERO_DERIVE)
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{
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n=0;
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if (EGAL(param->u[0],0.,0.0001))
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{
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if (!(EGAL(param->v[0],0.,0.0001)))
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{
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coord[n]=PI/2.;
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coord[n+1]=3.*PI/2.;
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n=n+2;
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}
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}
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else
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{
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coord[n]=(float)atan((double)(param->b*param->v[0]/param->a/param->u[0]));
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if (coord[n]<0.) coord[n]=coord[n]+PI;
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coord[n+1]=coord[n]+PI;
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n=n+2;
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}
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if (EGAL(param->u[1],0.,0.0001))
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{
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if (!(EGAL(param->v[1],0.,0.0001)))
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{
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coord[n]=PI/2.;
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coord[n+1]=3.*PI/2.;
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n=n+2;
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}
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}
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else
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{
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coord[n]=(float)atan((double)(param->b*param->v[1]/param->a/param->u[1]));
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if (coord[n]<0.) coord[n]=coord[n]+PI;
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coord[n+1]=coord[n]+PI;
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n=n+2;
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}
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if (n<4)
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if (EGAL(param->u[2],0.,0.0001))
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{
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if (!(EGAL(param->v[2],0.,0.0001)))
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{
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coord[n]=PI/2.;
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coord[n+1]=3.*PI/2.;
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}
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}
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else
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{
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coord[n]=(float)atan((double)(param->b*param->v[2]/param->a/param->u[2]));
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if (coord[n]<0.) coord[n]=coord[n]+PI;
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coord[n+1]=coord[n]+PI;
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}
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}
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}
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