Merge with master

[lilypond.git] / lily / line-interface.cc

diff --git a/lily/line-interface.cc b/lily/line-interface.cc
index f65dc946f2c70b62d7196f66159d99c2c1307dde..b9155a07ab53b4c0a28638282392e23218deb6e7 100644 (file)
--- a/lily/line-interface.cc
+++ b/lily/line-interface.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 2004--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
 */
 
 #include "line-interface.hh"
@@ -12,6 +12,7 @@
 #include "lookup.hh"
 #include "output-def.hh"
 #include "grob.hh"
+#include "font-interface.hh"
 
 Stencil
 Line_interface::make_arrow (Offset begin, Offset end,
@@ -31,6 +32,95 @@ Line_interface::make_arrow (Offset begin, Offset end,
   return Lookup::round_filled_polygon (points, thick);
 }
 
+Stencil
+Line_interface::make_trill_line (Grob *me,
+                                Offset from,
+                                Offset to)
+{
+  Offset dz = (to-from);
+  SCM alist_chain = Font_interface::text_font_alist_chain (me);
+  SCM style_alist = scm_list_n (scm_cons (ly_symbol2scm ("font-encoding"),
+                                         ly_symbol2scm ("fetaMusic")),
+                               SCM_UNDEFINED);
+
+  Font_metric *fm = select_font (me->layout (),
+                                scm_cons (style_alist,
+                                          alist_chain));
+
+  Stencil elt = fm->find_by_name ("scripts.trill_element");
+  elt.align_to (Y_AXIS, CENTER);
+  Real elt_len = elt.extent (X_AXIS).length ();
+  if (elt_len <= 0.0)
+    {
+      programming_error ("can't find scripts.trill_element");
+      return Stencil ();
+    }
+      
+  Stencil line;
+  Real len = 0.0;
+  do
+    {
+      line.add_at_edge (X_AXIS, RIGHT, elt, 0);
+      len = line.extent (X_AXIS).length ();
+    }
+  while (len + elt_len < dz.length ());
+
+  line.rotate (dz.arg (), Offset (LEFT, CENTER));
+  line.translate (from);
+
+  return line; 
+}
+
+
+Stencil
+Line_interface::make_zigzag_line (Grob *me,
+                                 Offset from,
+                                 Offset to)
+{
+  Offset dz = to -from;
+
+  Real thick = Staff_symbol_referencer::line_thickness (me);
+  thick *= robust_scm2double (me->get_property ("thickness"), 1.0); // todo: staff sym referencer? 
+
+  Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+  Real w = robust_scm2double (me->get_property ("zigzag-width"), 1) * staff_space;
+  int count = (int) ceil (dz.length () / w);
+  w = dz.length () / count;
+
+  Real l = robust_scm2double (me->get_property ("zigzag-length"), 1) * w;
+  Real h = l > w / 2 ? sqrt (l * l - w * w / 4) : 0;
+
+  Offset rotation_factor = complex_exp (Offset (0, dz.arg ()));
+
+  Offset points[3];
+  points[0] = Offset (0, -h / 2);
+  points[1] = Offset (w / 2, h / 2);
+  points[2] = Offset (w, -h / 2);
+  for (int i = 0; i < 3; i++)
+    points[i] = complex_multiply (points[i], rotation_factor);
+
+  Stencil squiggle (Line_interface::make_line (thick, points[0], points[1]));
+  squiggle.add_stencil (Line_interface::make_line (thick, points[1], points[2]));
+
+  Stencil total;
+  for (int i = 0; i < count; i++)
+    {
+      Stencil moved_squiggle (squiggle);
+      moved_squiggle.translate (from + Offset (i * w, 0) * rotation_factor);
+      total.add_stencil (moved_squiggle);
+    }
+
+  Box b;
+  b.add_point (Offset (0, 0));
+  b.add_point (dz);
+  b[X_AXIS].widen (thick / 2);
+  b[Y_AXIS].widen (thick / 2);
+
+  return Stencil (b, total.expr ());
+}
+
+
 Stencil
 Line_interface::make_dashed_line (Real thick, Offset from, Offset to,
                                  Real dash_period, Real dash_fraction)
@@ -113,7 +203,13 @@ Line_interface::line (Grob *me, Offset from, Offset to)
     * robust_scm2double (me->get_property ("thickness"), 1);
 
   SCM type = me->get_property ("style");
-
+  if (type == ly_symbol2scm ("zigzag"))
+    {
+      return make_zigzag_line (me, from, to);
+    }
+  else if (type == ly_symbol2scm ("trill"))
+    return make_trill_line (me, from, to);
+  
   Stencil stil;
 
   SCM dash_fraction = me->get_property ("dash-fraction");
@@ -129,9 +225,20 @@ Line_interface::line (Grob *me, Offset from, Offset to)
       Real period = Staff_symbol_referencer::staff_space (me)
        * robust_scm2double (me->get_property ("dash-period"), 1.0);
 
-      if (period < 0)
+      if (period <= 0)
        return Stencil ();
 
+      Real len = (to-from).length();
+      
+      int n = (int) rint ((len - period * fraction) / period);
+      if (n > 0)
+       {
+         /*
+           TODO: figure out something intelligent for really short
+           sections.
+          */
+         period = ((to-from).length() - period * fraction) / n;
+       }
       stil = make_dashed_line (thick, from, to, period, fraction);
     }
   else
@@ -153,24 +260,8 @@ ADD_INTERFACE (Line_interface,
               "dash-fraction "
               "thickness "
               "style "
+              "zigzag-length "
+              "zigzag-width "
               "arrow-length "
-              "arrow-width")
-
-
+              "arrow-width ")
 
-/* todo: move this somewhere else? */
-Stencil
-points_to_line_stencil (vector<Offset> points)
-{
-  Stencil ret;
-  for (vsize i = 1; i < points.size (); i++)
-    {
-      if (points[i-1].is_sane ()  && points[i].is_sane ())
-       {
-         Stencil line
-           = Line_interface::make_line (0.1, points[i-1], points[i]);
-         ret.add_stencil (line);
-       }
-    }
-  return ret;
-}