2 stencil.cc -- implement Stencil
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include <libc-extension.hh> // isinf
12 #include "font-metric.hh"
13 #include "dimensions.hh"
14 #include "interval.hh"
20 #include "ly-smobs.icc"
24 Stencil::smobbed_copy () const
26 Stencil * m = new Stencil (*this);
28 return m->smobbed_self ();
32 Stencil::extent (Axis a) const
37 Stencil::Stencil (Box b, SCM func)
50 Stencil::translate (Offset o)
55 if (abs (o[a]) > 100 CM
56 || isinf (o[a]) || isnan (o[a]))
58 programming_error ("Improbable offset for translation: setting to zero");
64 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
66 expr_, SCM_UNDEFINED);
73 Stencil::translate_axis (Real x,Axis a)
83 Stencil::add_stencil (Stencil const &m)
85 expr_ = scm_list_n (ly_symbol2scm ("combine-stencil"),
87 expr_, SCM_UNDEFINED);
92 Stencil::set_empty (bool e)
96 dim_[X_AXIS].set_empty ();
97 dim_[Y_AXIS].set_empty ();
101 dim_[X_AXIS] = Interval (0,0);
102 dim_[Y_AXIS] = Interval (0,0);
108 Stencil::align_to (Axis a, Real x)
113 Interval i (extent (a));
114 translate_axis (-i.linear_combination (x), a);
121 Stencil::add_at_edge (Axis a, Direction d, Stencil const &m, Real padding,
124 Real my_extent= is_empty () ? 0.0 : dim_[a][d];
125 Interval i (m.extent (a));
129 programming_error ("Stencil::add_at_edge: adding empty stencil.");
135 Real offset = (my_extent - his_extent) + d*padding;
136 if (minimum > 0 && fabs (offset) < minimum)
137 offset = sign (offset) * minimum;
140 toadd.translate_axis (offset, a);
147 Hmm... maybe this is not such a good idea ; stuff can be empty,
151 Stencil::is_empty () const
153 return expr_ == SCM_EOL;
157 Stencil::get_expr () const
165 Stencil::extent_box () const
169 IMPLEMENT_SIMPLE_SMOBS (Stencil);
173 Stencil::print_smob (SCM , SCM port, scm_print_state *)
175 scm_puts ("#<Stencil ", port);
176 scm_puts (" >", port);
183 Stencil::mark_smob (SCM s)
185 Stencil *r = (Stencil *) ly_cdr (s);
190 IMPLEMENT_TYPE_P (Stencil, "ly:stencil?");
191 IMPLEMENT_DEFAULT_EQUAL_P (Stencil);