Mathc initiation/a122

Sommaire

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	kg_curv2d.h

/* --------------------------------- */
/* save as kg_curv2d.h               */
/* --------------------------------- */
void G_Curve_2d(
CTRL_splot p,
double (*P_f)(double t),
double (*P_g)(double t),
tvalue t
)
{
FILE   *fp;
double  T;

  fp = fopen("a_main.plt","w");
  fprintf(fp," reset\n"
           " set zeroaxis lt 8\n" 
           " set grid\n\n" 
           " plot [%0.3f:%0.3f] [%0.3f:%0.3f]\\\n" 
           " \"a_curve\"     with linespoints lt  6,\\\n" 
           " \"a_vector\"    with linespoints lt 16 lw 3,\\\n",
             p.xmin,p.xmax,p.ymin,p.ymax);
  fclose(fp);


  fp = fopen("a_curve","w");
  for(T=t.min; T<t.max; T+=t.step)
      fprintf(fp," %6.3f  %6.3f\n",
             (*P_f)(T),(*P_g)(T));

  fprintf(fp," %6.3f  %6.3f\n",
         (*P_f)(t.value),(*P_g)(t.value));    
  fclose(fp);


  fp = fopen("a_vector","w");
  fprintf(fp,"  0  0   \n %6.5f  %6.5f  \n",
           (*P_f)(t.value),(*P_g)(t.value));
  fclose(fp);
}
/* --------------------------------- */
/* --------------------------------- */