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"
19 #include "ly-smobs.icc"
27 Stencil::Stencil (Box b, SCM func)
34 Stencil::print_smob (SCM, SCM port, scm_print_state *)
36 scm_puts ("#<Stencil ", port);
37 scm_puts (" >", port);
42 Stencil::mark_smob (SCM smob)
44 Stencil *s = (Stencil*) ly_cdr (smob);
48 IMPLEMENT_SIMPLE_SMOBS (Stencil);
49 IMPLEMENT_TYPE_P (Stencil, "ly:stencil?");
50 IMPLEMENT_DEFAULT_EQUAL_P (Stencil);
53 Stencil::extent (Axis a) const
58 /* Hmm... maybe this is not such a good idea ; stuff can be empty,
61 Stencil::is_empty () const
63 return expr_ == SCM_EOL;
67 Stencil::expr () const
73 Stencil::extent_box () const
78 Stencil::origin () const
84 Stencil::translate (Offset o)
89 if (abs (o[a]) > 100 CM
90 || isinf (o[a]) || isnan (o[a]))
92 programming_error ("Improbable offset for translation: setting to zero");
98 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
100 expr_, SCM_UNDEFINED);
107 Stencil::translate_axis (Real x, Axis a)
115 Stencil::add_stencil (Stencil const &s)
117 expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
122 Stencil::set_empty (bool e)
126 dim_[X_AXIS].set_empty ();
127 dim_[Y_AXIS].set_empty ();
131 dim_[X_AXIS] = Interval (0,0);
132 dim_[Y_AXIS] = Interval (0,0);
137 Stencil::align_to (Axis a, Real x)
142 Interval i (extent (a));
143 translate_axis (-i.linear_combination (x), a);
146 /* FIXME: unintuitive naming, you would expect *this to be moved.
147 Kept (keeping?) API for compat with add_at_edge ().
149 What is PADDING, what is MINIMUM, exactly? */
151 Stencil::moved_to_edge (Axis a, Direction d, Stencil const &s,
152 Real padding, Real minimum) const
154 Interval my_extent = dim_[a];
155 Interval i (s.extent (a));
159 programming_error ("Stencil::moved_to_edge: adding empty stencil.");
165 Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
169 toadd.translate_axis (offset,a);
171 if (minimum > 0 && d * (-origin ()[a] + toadd.origin ()[a]) < minimum)
172 toadd.translate_axis ( -toadd.origin ()[a]
173 + origin ()[a] + d * minimum, a);
178 /* See scheme Function. */
180 Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding,
183 add_stencil (moved_to_edge (a, d, s, padding, minimum));