2 stencil.cc -- implement Stencil
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
12 #include "font-metric.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
77 Stencil::rotate (Real a, Offset off)
79 rotate_degrees (a * 180/M_PI, off);
83 Rotate this stencil around the point RELATIVE_OFF.
85 RELATIVE_OFF is measured in terms of the extent of the stencil, so
86 -1 = LEFT/DOWN edge, 1 = RIGHT/UP edge.
89 Stencil::rotate_degrees (Real a, Offset relative_off)
91 const Real x_cen = extent (X_AXIS).center ();
92 const Real y_cen = extent (Y_AXIS).center ();
95 * Calculate the center of rotation
97 const Real x = x_cen + relative_off[X_AXIS] * x_cen;
98 const Real y = y_cen + relative_off[Y_AXIS] * y_cen;
101 * Build scheme expression (processed in stencil-interpret.cc)
103 expr_ = scm_list_n (ly_symbol2scm ("rotate-stencil"),
104 scm_list_2 (scm_from_double (a),
105 scm_cons (scm_from_double (x), scm_from_double (y))),
106 expr_, SCM_UNDEFINED);
109 * Calculate the new bounding box
112 pts.push_back (Offset (-x_cen, -y_cen));
113 pts.push_back (Offset (x_cen, -y_cen));
114 pts.push_back (Offset (x_cen, y_cen));
115 pts.push_back (Offset (-x_cen, y_cen));
117 const Offset rot = complex_exp (Offset (0, a * M_PI / 180.0));
119 for (vsize i = 0; i < pts.size (); i++)
120 dim_.add_point (pts[i] * rot + Offset (x_cen, y_cen));
124 Stencil::translate (Offset o)
133 || fabs (o[a]) > 1e6)
135 programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
137 + "Setting to zero.");
139 if (strict_infinity_checking)
140 scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
145 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
147 expr_, SCM_UNDEFINED);
153 Stencil::translate_axis (Real x, Axis a)
161 Stencil::add_stencil (Stencil const &s)
163 expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
168 Stencil::set_empty (bool e)
172 dim_[X_AXIS].set_empty ();
173 dim_[Y_AXIS].set_empty ();
177 dim_[X_AXIS] = Interval (0, 0);
178 dim_[Y_AXIS] = Interval (0, 0);
183 Stencil::align_to (Axis a, Real x)
188 Interval i (extent (a));
189 translate_axis (-i.linear_combination (x), a);
192 /* See scheme Function. */
194 Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding)
196 Interval my_extent = dim_[a];
197 Interval i (s.extent (a));
201 programming_error ("Stencil::add_at_edge: adding empty stencil.");
207 Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
211 toadd.translate_axis (offset, a);
216 Stencil::in_color (Real r, Real g, Real b) const
218 Stencil new_stencil (extent_box (),
219 scm_list_3 (ly_symbol2scm ("color"),
220 scm_list_3 (scm_from_double (r),
222 scm_from_double (b)),
229 Stencil::translated (Offset z) const