2 line-interface.cc -- implement Line_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "line-interface.hh"
11 #include "staff-symbol-referencer.hh"
13 #include "output-def.hh"
16 Line_interface::make_dashed_line (Real thick, Offset from, Offset to,
17 Real dash_period, Real dash_fraction)
19 dash_fraction = (dash_fraction >? 0) <? 1.0;
20 Real on = dash_fraction * dash_period + thick;
21 Real off = dash_period - on;
23 SCM at = scm_list_n (ly_symbol2scm ("dashed-line"),
24 scm_make_real (thick),
27 scm_make_real (to[X_AXIS] - from[X_AXIS]),
28 scm_make_real (to[Y_AXIS] - from[Y_AXIS]),
32 box.add_point (Offset (0, 0));
33 box.add_point (to - from);
35 box[X_AXIS].widen (thick / 2);
36 box[Y_AXIS].widen (thick / 2);
38 Stencil m = Stencil (box, at);
44 Line_interface::make_line (Real th, Offset from, Offset to)
46 SCM at = scm_list_n (ly_symbol2scm ("draw-line"),
48 scm_make_real (from[X_AXIS]),
49 scm_make_real (from[Y_AXIS]),
50 scm_make_real (to[X_AXIS]),
51 scm_make_real (to[Y_AXIS]),
58 box[X_AXIS].widen (th / 2);
59 box[Y_AXIS].widen (th / 2);
61 return Stencil (box, at);
65 Line_interface::line (Grob *me, Offset from, Offset to)
67 Real thick = Staff_symbol_referencer::line_thickness (me)
68 * robust_scm2double (me->get_property ("thickness"), 1);
70 SCM type = me->get_property ("style");
72 SCM dash_fraction = me->get_property ("dash-fraction");
73 if (scm_is_number (dash_fraction) || type == ly_symbol2scm ("dotted-line"))
77 = type == ly_symbol2scm ("dotted-line")
79 : robust_scm2double (dash_fraction, 0.4);
81 fraction = (fraction >? 0) <? 1.0;
82 Real period = Staff_symbol_referencer::staff_space (me)
83 * robust_scm2double (me->get_property ("dash-period"), 1.0);
88 return make_dashed_line (thick, from, to, period, fraction);
92 return make_line (thick, from, to);
96 ADD_INTERFACE (Line_interface, "line-interface",
97 "Generic line objects. Any object using lines supports this. Normally, "
98 "you get a straight line. If @code{dash-period} is defined, a dashed line is "
99 "produced; the length of the dashes is tuned with "
100 "@code{dash-fraction}. If the latter is set to 0, a dotted line is "
101 "produced. If @code{dash-fraction} is negative, the line is made "
104 "dash-period dash-fraction thickness style")