2 dimension-cache.hh -- declare Dimension_cache
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #ifndef DIMENSION_CACHE_HH
11 #define DIMENSION_CACHE_HH
13 #include "interval.hh"
15 #include "lily-proto.hh"
18 class Dimension_cache;
19 typedef Interval (*Dim_cache_callback)(Dimension_cache const *);
20 typedef Real (*Offset_cache_callback)(Dimension_cache const *);
23 Adminstration of offset dimension info.
28 /** Is this element dimensionless?.
29 This is private to guarantee correctness of the cache
34 The offset wrt. to the center of #parent_l_#
43 Graphical_element *elt_l_;
44 Dim_cache_callback callback_l_;
45 friend class Graphical_element;
49 Offset_cache_callback off_callback_l_;
52 Real get_offset () const;
53 void set_callback (Dim_cache_callback);
54 /** The #offset_# is defined with regard to this graphical_element/
56 void set_offset_callback (Offset_cache_callback);
57 Dimension_cache * parent_l_;
59 Graphical_element *element_l () const { return elt_l_; }
62 void invalidate_dependencies ();
64 Dimension_cache(Dimension_cache const&);
69 Find the offset relative to D. If D equals THIS, then it is 0.
70 Otherwise, it recursively defd as
72 OFFSET_ + PARENT_L_->relative_coordinate (D)
74 Real relative_coordinate (Dimension_cache *d) const;
75 Dimension_cache*common_refpoint (Dimension_cache const* s) const;
76 Dimension_cache*common_refpoint (Link_array<Dimension_cache> caches) const;
77 void set_empty (bool);
78 void translate (Real);
81 void set_offset (Real);
83 bool valid_b () const { return valid_b_; }
84 bool empty_b() const { return empty_b_; }
85 Interval get_dim () const;
89 #endif /* DIMENSION_CACHE_HH */