mf/feta-sleur.mf

   1 %
   2 % feta-sleur.mf --  implement runtime MF slurs
   3 %
   4 % source file of LilyPond's pretty-but-neat music font
   5 %
   6 % (c) 1997 Jan Nieuwenhuizen <janneke@gnu.org>
   7 % & Han-Wen Nienhuys <hanwen@stack.nl>
   8 %
   9 % see Documentation/fonts.tex
  10
  11 % mode_setup;
  12
  13 %% staffsize#=16pt#;
  14 % interline#:=staffsize#/4;
  15 % stafflinethickness#:=0.1interline#;
  16
  17 pi:=3.14159;
  18
  19 def atan(expr x) =
  20         (angle(1,x)*pi/180)
  21         enddef;
  22
  23
  24 sleur_pen#:=stafflinethickness#;
  25 slurheightlimit#:=staffsize#/2;
  26 slurthick#:=1.8stafflinethickness#;
  27
  28 define_pixels(staffsize,interline,stafflinethickness);
  29 define_pixels(sleur_pen,slurheightlimit,slurthick);
  30
  31 sluralpha:=2slurheightlimit#/pi;
  32 slurratio:=1/3;
  33 slurbeta:=pi*slurratio/2slurheightlimit#;
  34
  35 def draw_slur(expr dxs,dys,hs,d) =
  36         save x, y;
  37         save b, dx, dy, h, indent;
  38         dx#:=dxs*1pt#;
  39         dy#:=dys*1pt#;
  40         h#:=hs*1pt#;
  41         define_pixels(dx,dy);
  42         b#:=length(dx#,dy#);
  43         indent#:=sluralpha*atan(slurbeta*b#);
  44         define_pixels(b,h,indent);
  45         height:=(indent+h)*d;
  46         z1=(0,0);
  47         z2=(b,0);
  48         z3=(indent,height);
  49         z4=(b-indent,height);
  50         z5=z4-(0,d*slurthick);
  51         z6=z3-(0,d*slurthick);
  52         path boogje;
  53         boogje=z1..controls z3 and z4..z2..controls z5 and z6..cycle;
  54         boogje:=boogje rotated angle(dxs,dys);
  55         pickup pencircle scaled sleur_pen;
  56         filldraw boogje;
  57 enddef;
  58
  59