-Axis
-Dimension_cache::axis () const
-{
- if (elt_l_-> dim_cache_[X_AXIS] == this)
- return X_AXIS;
- else
- return Y_AXIS;
-}
-
-Real
-Dimension_cache::get_offset () const
-{
- if (!off_valid_b_ && off_callback_l_ )
- {
- Dimension_cache *d = (Dimension_cache*) this;
- d->off_valid_b_ = true;
- d->basic_offset_ = (*off_callback_l_) (d);
- }
-
- return basic_offset_ + extra_offset_;
-}
-
-Dimension_cache *
-Dimension_cache::common_refpoint (Dimension_cache const* s) const
-{
- Link_array<Dimension_cache> my_groups;
- for (Dimension_cache const *c = this; c ; c = c->parent_l_)
- my_groups.push ((Dimension_cache*)c);
-
- Dimension_cache const *common=0;
-
- for (Dimension_cache const * d = s; !common && d; d = d->parent_l_)
- common = (Dimension_cache const*)my_groups.find_l (d);
-
- return (Dimension_cache*) common;
-}
-
-
-
-void
-Dimension_cache::set_empty (bool b)
-{
- if (empty_b_ != b)
- {
- empty_b_ = b;
- if (!empty_b_)
- invalidate ();
- }
-}
-
-Interval
-Dimension_cache::get_dim () const
-{
- Interval r;
- if (empty_b_)
- {
- r.set_empty ();
- return r;
- }
-
- if (!valid_b_)
- {
- Dimension_cache *nc = ((Dimension_cache*)this);
- nc->dim_= (*callback_l_ ) (nc);
- nc->valid_b_ = true;
- }
-
- r=dim_;
-
- return r;
-}
-
-void
-Dimension_cache::set_callback (Dim_cache_callback c)