2 page.cc -- implement Page
4 source file of the GNU LilyPond music typesetter
6 (c) 2004 Jan Nieuwenhuizen <janneke@gnu.org>
9 #include "dimensions.hh"
10 #include "ly-module.hh"
12 #include "paper-def.hh"
13 #include "paper-outputter.hh"
14 #include "paper-line.hh"
18 int Page::page_count_ = 0;
19 Real Page::MIN_COVERAGE_ = 0.66;
21 Page::Page (Paper_def *paper, int number)
37 header_ = scm_call_2 (paper_->c_variable ("make-header"),
39 scm_int2num (number_));
40 if (unsmob_stencil (header_))
41 unsmob_stencil (header_)->align_to (Y_AXIS, UP);
43 footer_ = scm_call_2 (paper_->c_variable ("make-footer"),
45 scm_int2num (number_));
46 if (unsmob_stencil (footer_))
47 unsmob_stencil (footer_)->align_to (Y_AXIS, UP);
56 #include "ly-smobs.icc"
58 IMPLEMENT_DEFAULT_EQUAL_P (Page)
59 IMPLEMENT_SMOBS (Page)
60 IMPLEMENT_TYPE_P (Page, "ly:page?")
63 Page::mark_smob (SCM smob)
65 Page *p = (Page*) SCM_CELL_WORD_1 (smob);
66 scm_gc_mark (p->header_);
67 scm_gc_mark (p->footer_);
68 scm_gc_mark (p->copyright_);
69 scm_gc_mark (p->tagline_);
70 //scm_gc_mark (p->lines_);
75 Page::print_smob (SCM smob, SCM port, scm_print_state*)
77 Page *p = (Page*) ly_cdr (smob);
78 scm_puts ("#<", port);
79 scm_puts (classname (p), port);
80 scm_puts (to_string (p->number_).to_str0 (), port);
87 stack_stencils (Stencil a, Stencil b, Offset *origin)
89 Real height = b.extent (Y_AXIS).length ();
92 programming_error (to_string ("Improbable stencil height: %f", height));
99 (*origin)[Y_AXIS] += height;
104 Page::to_stencil () const
106 SCM proc = paper_->lookup_variable (ly_symbol2scm ("page-to-stencil"));
107 return *unsmob_stencil (scm_call_1 (proc, self_scm ()));
112 Page::left_margin () const
114 return (paper_->get_dimension (ly_symbol2scm ("hsize"))
115 - paper_->get_dimension (ly_symbol2scm ("linewidth"))) / 2;
118 LY_DEFINE (ly_page_header_lines_footer_stencil, "ly:page-header-lines-footer-stencil",
120 "Simple header, lines, footer stencil from PAGE.")
122 Page *p = unsmob_page (page);
123 SCM_ASSERT_TYPE (p, page, SCM_ARG1, __FUNCTION__, "page");
126 Offset o (p->left_margin (),
127 p->paper_->get_dimension (ly_symbol2scm ("top-margin")));
129 Real vfill = (p->line_count_ > 1
130 ? (p->text_height () - p->height_) / (p->line_count_ - 1)
133 Real coverage = p->height_ / p->text_height ();
134 if (coverage < p->MIN_COVERAGE_)
135 /* Do not space out a badly filled page. This is too simplistic
136 (ie broken), because this should not vary too much between
137 (subsequent?) pages in a book. */
140 if (Stencil *s = unsmob_stencil (p->header_))
142 stencil = stack_stencils (stencil, *s, &o);
143 o[Y_AXIS] += p->paper_->get_dimension (ly_symbol2scm ("head-sep"));
146 for (SCM s = p->lines_; s != SCM_EOL; s = ly_cdr (s))
148 Paper_line *p = unsmob_paper_line (ly_car (s));
149 stencil = stack_stencils (stencil, p->to_stencil (), &o);
150 /* Do not put vfill between title and its music, */
151 if (ly_cdr (s) != SCM_EOL
152 && (!p->is_title () || vfill < 0))
154 /* rather put extra just before the title. */
155 if (ly_cdr (s) != SCM_EOL
156 && (unsmob_paper_line (ly_cadr (s))->is_title () && vfill > 0))
160 o[Y_AXIS] = p->paper_->get_dimension (ly_symbol2scm ("vsize"))
161 - p->paper_->get_dimension (ly_symbol2scm ("bottom-margin"));
162 if (unsmob_stencil (p->copyright_))
163 o[Y_AXIS] -= unsmob_stencil (p->copyright_)->extent (Y_AXIS).length ();
164 if (unsmob_stencil (p->tagline_))
165 o[Y_AXIS] -= unsmob_stencil (p->tagline_)->extent (Y_AXIS).length ();
166 if (unsmob_stencil (p->footer_))
167 o[Y_AXIS] -= unsmob_stencil (p->footer_)->extent (Y_AXIS).length ();
169 if (Stencil *s = unsmob_stencil (p->copyright_))
170 stencil = stack_stencils (stencil, *s, &o);
171 if (Stencil *s = unsmob_stencil (p->tagline_))
172 stencil = stack_stencils (stencil, *s, &o);
173 if (Stencil *s = unsmob_stencil (p->footer_))
174 stencil = stack_stencils (stencil, *s, &o);
176 return stencil.smobbed_copy ();
180 Page::text_height () const
182 Real h = paper_->get_dimension (ly_symbol2scm ("vsize"))
183 - paper_->get_dimension (ly_symbol2scm ("top-margin"))
184 - paper_->get_dimension (ly_symbol2scm ("bottom-margin"));
185 if (unsmob_stencil (header_))
186 h -= unsmob_stencil (header_)->extent (Y_AXIS).length ()
187 + paper_->get_dimension (ly_symbol2scm ("head-sep"));
188 if (unsmob_stencil (copyright_)
189 || unsmob_stencil (tagline_)
190 || unsmob_stencil (footer_))
191 h -= paper_->get_dimension (ly_symbol2scm ("foot-sep"));
192 if (unsmob_stencil (copyright_))
193 h -= unsmob_stencil (copyright_)->extent (Y_AXIS).length ();
194 if (unsmob_stencil (tagline_))
195 h -= unsmob_stencil (tagline_)->extent (Y_AXIS).length ();
196 if (unsmob_stencil (footer_))
197 h -= unsmob_stencil (footer_)->extent (Y_AXIS).length ();
201 LY_DEFINE (ly_page_paper_lines, "ly:page-paper-lines",
203 "Return paper-lines from PAGE.")
205 Page *p = unsmob_page (page);
206 SCM_ASSERT_TYPE (p, page, SCM_ARG1, __FUNCTION__, "page");