Mathc initiation/a247
Apparence
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kbezier.h |
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/* --------------------------------- */
/* save as kbezier.h */
/* --------------------------------- */
void G_quadratic_Bezier_2d(
CTRL_splot w,
pt2d P0,
pt2d P1,
pt2d P2
)
{
tvalue t;
t.min = 0;
t.max = 1;
t.step = .01;
FILE *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"
// " \"circle\" with linesp lt 1 pt 1,\\\n"
" \"curve\" with linesp lt 3 pt 1,\\\n"
" \"ctrlpt\" with linesp lt 4 pt 4 \n\n",
w.xmin,w.xmax,w.ymin,w.ymax);
fclose(fp);
fp = fopen("curve","w");
for(t.value=t.min; t.value<=t.max; t.value+=t.step)
fprintf(fp," %6.5f %6.5f\n",
quadratic_Bezier_x_2d(t.value,P0,P1,P2),
quadratic_Bezier_y_2d(t.value,P0,P1,P2));
fclose(fp);
fp = fopen("ctrlpt","w");
fprintf(fp," %6.5f %6.5f\n",P0.x,P0.y);
fprintf(fp," %6.5f %6.5f\n",P1.x,P1.y);
fprintf(fp," %6.5f %6.5f\n",P2.x,P2.y);
fclose(fp);
fp = fopen("circle","w");
for(t.value=0;t.value<2.01*PI;t.value+=.05)
fprintf(fp," %6.5f %6.5f\n",5*cos(t.value)+0,5*sin(t.value)+0);
fclose(fp);
}
/* ----------------------------------------------------- */
void G_wp_quadratic_Bezier_2d(
CTRL_splot w,
pt2d P0,
pt2d P1,
pt2d P2
)
{
tvalue t;
t.min = 0;
t.max = 1;
t.step = .01;
FILE *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"
// " \"circle\" with linesp lt 1 pt 1,\\\n"
" \"curve\" with linesp lt 3 pt 1 \n\n",
w.xmin,w.xmax,w.ymin,w.ymax);
fclose(fp);
fp = fopen("curve","w");
for(t.value=t.min; t.value<=t.max; t.value+=t.step)
fprintf(fp," %6.5f %6.5f\n",
quadratic_Bezier_x_2d(t.value,P0,P1,P2),
quadratic_Bezier_y_2d(t.value,P0,P1,P2));
fclose(fp);
fp = fopen("circle","w");
for(t.value=0;t.value<2.01*PI;t.value+=.05)
fprintf(fp," %6.5f %6.5f\n",5*cos(t.value)+0,5*sin(t.value)+0);
fclose(fp);
}
/* --------------------------------- */
/* --------------------------------- */