void
draw_turtle(ModeInfo * mi)
{
turtlestruct *tp;
if (turtles == NULL)
return;
tp = &turtles[MI_SCREEN(mi)];
if (++tp->time > MI_CYCLES(mi))
init_turtle(mi);
MI_IS_DRAWN(mi) = True;
if (MI_NPIXELS(mi) > 2)
XSetForeground(MI_DISPLAY(mi), MI_GC(mi),
MI_PIXEL(mi, NRAND(MI_NPIXELS(mi))));
tp->r = tp->r >> 1;
tp->level++;
if (tp->r > 1)
switch (tp->curve) {
case HILBERT:
switch (tp->dir) {
case 0:
tp->pt1.x = tp->pt2.x = tp->start.x + tp->r / 2;
tp->pt1.y = tp->pt2.y = tp->start.y + tp->r / 2;
generate_hilbert(mi, 0, tp->r);
break;
case 1:
tp->pt1.x = tp->pt2.x = tp->start.x + tp->min - tp->r / 2;
tp->pt1.y = tp->pt2.y = tp->start.y + tp->min - tp->r / 2;
generate_hilbert(mi, 0, -tp->r);
break;
case 2:
tp->pt1.x = tp->pt2.x = tp->start.x + tp->min - tp->r / 2;
tp->pt1.y = tp->pt2.y = tp->start.y + tp->min - tp->r / 2;
generate_hilbert(mi, -tp->r, 0);
break;
case 3:
tp->pt1.x = tp->pt2.x = tp->start.x + tp->r / 2;
tp->pt1.y = tp->pt2.y = tp->start.y + tp->r / 2;
generate_hilbert(mi, tp->r, 0);
}
break;
case CESARO_VAR:
generate_cesarovar(mi,
(double) tp->pt1.x, (double) tp->pt1.y,
(double) tp->pt2.x, (double) tp->pt2.y,
tp->level, tp->sign);
break;
case HARTER_HEIGHTWAY:
generate_harter_heightway(mi,
(double) tp->pt1.x, (double) tp->pt1.y,
(double) tp->pt2.x, (double) tp->pt2.y,
tp->level, tp->sign);
break;
}
}
void main()
{
/* initialize turtle graphics */
init_turtle();
/* draw 'V' */
vee(40, 10);
right(180);
vee(40, 10);
/* wait for user to click right mouse button */
wait_button();
}
