2 stencil.cc -- implement Stencil
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
12 #include "font-metric.hh"
13 #include "input-smob.hh"
14 #include "string-convert.hh"
17 #include "ly-smobs.icc"
25 Stencil::Stencil (Box b, SCM func)
32 Stencil::print_smob (SCM, SCM port, scm_print_state *)
34 scm_puts ("#<Stencil ", port);
35 scm_puts (" >", port);
40 Stencil::mark_smob (SCM smob)
42 Stencil *s = (Stencil *) SCM_CELL_WORD_1 (smob);
46 IMPLEMENT_SIMPLE_SMOBS (Stencil);
47 IMPLEMENT_TYPE_P (Stencil, "ly:stencil?");
48 IMPLEMENT_DEFAULT_EQUAL_P (Stencil);
51 Stencil::extent (Axis a) const
57 Stencil::is_empty () const
59 return (expr_ == SCM_EOL
60 || dim_[X_AXIS].is_empty ()
61 || dim_[Y_AXIS].is_empty ());
65 Stencil::expr () const
71 Stencil::extent_box () const
76 Stencil::origin () const
82 Stencil::translate (Offset o)
93 programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
95 + "Setting to zero.");
97 if (strict_infinity_checking)
98 scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
103 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
105 expr_, SCM_UNDEFINED);
112 Stencil::translate_axis (Real x, Axis a)
120 Stencil::add_stencil (Stencil const &s)
122 expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
127 Stencil::set_empty (bool e)
131 dim_[X_AXIS].set_empty ();
132 dim_[Y_AXIS].set_empty ();
136 dim_[X_AXIS] = Interval (0, 0);
137 dim_[Y_AXIS] = Interval (0, 0);
142 Stencil::align_to (Axis a, Real x)
147 Interval i (extent (a));
148 translate_axis (-i.linear_combination (x), a);
151 /* FIXME: unintuitive naming, you would expect *this to be moved.
152 Kept (keeping?) API for compat with add_at_edge ().
154 What is PADDING, what is MINIMUM, exactly? */
156 Stencil::moved_to_edge (Axis a, Direction d, Stencil const &s,
157 Real padding, Real minimum) const
159 Interval my_extent = dim_[a];
160 Interval i (s.extent (a));
164 programming_error ("Stencil::moved_to_edge: adding empty stencil.");
166 // SCM_ASSERT_TYPE (0, s.expr (), SCM_ARG1, __FUNCTION__, "non-empty stencil");
171 Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
175 toadd.translate_axis (offset, a);
177 if (minimum > 0 && d * (-origin ()[a] + toadd.origin ()[a]) < minimum)
178 toadd.translate_axis (-toadd.origin ()[a]
179 + origin ()[a] + d * minimum, a);
184 /* See scheme Function. */
186 Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding,
189 add_stencil (moved_to_edge (a, d, s, padding, minimum));
193 Stencil::in_color (Real r, Real g, Real b) const
195 Stencil new_stencil (extent_box (),
196 scm_list_3 (ly_symbol2scm ("color"),
197 scm_list_3 (scm_from_double (r),
199 scm_from_double (b)),