void undo_addpoint(void)
{
if (last_object == O_POLYLINE)
linepoint_deleting(saved_objects.lines, last_prev_point,
last_selected_point);
else
splinepoint_deleting(saved_objects.splines, last_prev_point,
last_selected_point);
}
static void
init_delete_point(F_line *obj, int type, int x, int y, F_point *p, F_point *q)
{
int n;
switch (type) {
case O_POLYLINE:
cur_l = (F_line *) obj;
/* the search routine will ensure we don't have a box */
n = num_points(cur_l->points);
if (cur_l->type == T_POLYGON) {
if (n <= 4) { /* count first pt twice for closed object */
put_msg("A polygon cannot have less than 3 points");
beep();
return;
}
} else if (n <= 1) {
/* alternative would be to remove the dot altogether */
put_msg("A dot must have at least 1 point");
beep();
return;
}
linepoint_deleting(cur_l, p, q);
break;
case O_SPLINE:
cur_s = (F_spline *) obj;
n = num_points(cur_s->points);
if (closed_spline(cur_s)) {
if (n <= CLOSED_SPLINE_MIN_NUM_POINTS) {
put_msg("A closed spline cannot have less than %d points",
CLOSED_SPLINE_MIN_NUM_POINTS);
beep();
return;
}
} else if (n <= OPEN_SPLINE_MIN_NUM_POINTS) {
put_msg("A spline cannot have less than %d points",
OPEN_SPLINE_MIN_NUM_POINTS);
beep();
return;
}
splinepoint_deleting(cur_s, p, q);
break;
default:
return;
}
}
