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/*
spanner.hh -- part of LilyPond
(c) 1996,97 Han-Wen Nienhuys
*/
#ifndef SPANNER_HH
#define SPANNER_HH
#include "proto.hh"
#include "staff-elem.hh"
/** a symbol which is attached between two columns. A spanner is a symbol which spans across several columns, so its
final appearance can only be calculated after the breaking problem
is solved.
Examples
- (de)crescendo
- slur
- beam
- bracket
Spanner should know about the items which it should consider:
e.g. slurs should be steep enough to "enclose" all those items. This
is absolutely necessary for beams, since they have to adjust the
length of stems of notes they encompass.
*/
struct Spanner:Staff_elem {
PCol *left_col_l_, *right_col_l_;
/* *************** */
Spanner();
virtual Interval width()const;
void do_print()const;
Spanner *broken_at(PCol *c1, PCol *c2) const;
virtual Spanner* spanner() { return this; }
protected:
/**
clone a piece of this spanner.
PRE
c1 >= start, c2 <= stop
*/
virtual Spanner *do_break_at( PCol *c1, PCol *c2) const=0;
NAME_MEMBERS(Spanner);
};
#endif
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