Interval result;
Grob *me = unsmob_grob (smob);
if (Grob *staff = Staff_symbol_referencer::get_staff_symbol (me))
- result = staff->extent (staff, Y_AXIS);
-
+ {
+ result = staff->extent (staff, Y_AXIS);
+
+ /* Due to rounding problems, bar lines extending to the outermost edges
+ of the staff lines appear wrongly in on-screen display
+ (and, to a lesser extent, in print) - they stick out a pixel.
+ The solution is to extend bar lines only to the middle
+ of the staff line - unless they have different colors,
+ when it would be undesirable.
+ */
+ SCM bar_line_color = me->get_property ("color");
+ SCM staff_color = staff->get_property ("color");
+ if (bar_line_color == staff_color)
+ result *= (1 - 0.5 * (Staff_symbol_referencer::line_thickness (me) /
+ Staff_symbol_referencer::staff_radius (me)));
+ }
return ly_interval2scm (result);
}