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% Copyright 1993 Gilles F. Robert.
% You may freely use, modify and/or distribute this file.
% This statement added 2008/11/14 by Clea F. Rees on the basis of the email exchange archived at http://lists.debian.org/debian-tex-maint/2008/05/msg00040.html.
%
% This is blbbase.mf (29-03-93) v1.0
% The base file for Computer Modern Blackboard (a supplement to {\tt cmbase.mf})
% Most of the code is borrowed from cmbase.mf but slightly modified
% Gilles F. ROBERT March 93
if unknown cmbase: input cmbase; fi
blbbase:=1;
numeric interspace#,cap_interspace#,interspace,cap_interspace,
curve_interspace,cap_curve_interspace;
def normal_adjust_fit(expr left_adjustment,right_adjustment) =
l:=-hround(left_adjustment*hppp)-letter_fit;
interim xoffset:=-l;
charwd:=charwd+2letter_fit#+left_adjustment+right_adjustment+cap_interspace#;
r:=l+hround(charwd*hppp)-shrink_fit;
w:=r-hround(right_adjustment*hppp)-letter_fit;
enddef;
def mono_adjust_fit(expr left_adjustment,right_adjustment) =
numeric expansion_factor;
mono_charwd#+cap_interspace#=2letter_fit#
+expansion_factor*(charwd+left_adjustment+right_adjustment+cap_interspace#);
forsuffixes $=u,jut,cap_jut,beak_jut,apex_corr:
$:=$.#*expansion_factor*hppp; endfor
l:=-hround(left_adjustment*expansion_factor*hppp)-letter_fit;
interim xoffset:=-l;
r:=l+mono_charwd+cap_interspace-shrink_fit;
w:=r-hround(right_adjustment*expansion_factor*hppp)-letter_fit;
charwd:=mono_charwd#; charic:=mono_charic#;
enddef;
extra_beginchar := extra_beginchar &"numeric Delta_x;";
vardef pen_duplicate(text t) =
forsuffixes $=t :
x$=.5[x.G$,x.D$]; y.G$=y.D$=y$;
forsuffixes e=l,r :
z.G$e-z.G$ = z.D$e-z.D$ = z$e-z$;
endfor
endfor
forsuffixes $=t : x.D$ - x.G$ = endfor Delta_x;
enddef;
vardef double text t =
forsuffixes z=z.G,z.D : t; endfor
enddef;
vardef define_upper(suffix @,$)(expr p) =
forsuffixes e=l,r:
top z@e = (z$e--(x$e,infinity)) intersectionpoint p;
x@e := x$e;
endfor enddef;
vardef define_lower(suffix @,$)(expr p) =
forsuffixes e=l,r:
bot z@e = (z$e--(x$e,-infinity)) intersectionpoint p;
x@e := x$e;
endfor enddef;
vardef define_upper_and_lower(suffix @,@@,$)(expr p) =
define_upper(@,$,p);
define_lower(@@,$,p);
enddef;
vardef mid_biserif(suffix $,$$,@) % serif at |z$| for stroke from |z$$|
(expr darkness) suffix modifier =
pickup crisp.nib; numeric bracket_height; pair downward;
bracket_height=if dark.modifier: 1.5 fi\\ bracket;
if y$<y$$: y@2=min(y$+bracket_height,y$$);
top y@1-slab=bot y@0+eps=tiny.bot y$; downward=z$-z$$;
if y@1>y@2: y@2:=y@1; fi
else: y@2=max(y$-bracket_height,y$$);
bot y@1+slab=top y@0-eps=tiny.top y$; downward=z$$-z$;
if y@1<y@2: y@2:=y@1; fi fi
y@3=y@2;
forsuffixes @@= @0,@2,@3:
z@@=.5[z.G@@,z.D@@]; y.G@@=y.D@@;
endfor
z@3=z@2=whatever[z$,z$$]; z@0=whatever[z$,z$$];
z.D@2+penoffset downward of currentpen =
z.D$l+penoffset downward of pen_[tiny.nib]+whatever*downward;
z.D@0=z.D$+whatever*downward; z.D@3=z.D@0+whatever*downward;
if x.D@3<x.D@2+eps: x.D@3:=x.D@2+eps; fi
%z.G@2-penoffset downward of currentpen =
% z.G$r-penoffset downward of pen_[tiny.nib]+whatever*downward;
% x.G@0=x.G$; z.G@3=z.G@0+whatever*downward;
% if x.G@3>x.G@2-eps: x.G@3:=x.G@2-eps; fi
pair base; ypart base=y@1; base=z$+whatever*downward;
filldraw z.G@2{z$-z$$}
...darkness[base,z@2]{z.D@2-z.G@2}
...{z$$-z$}z.D@2--z.D@3--z.D@0--z.G@0--z.G@3--cycle; % the serif
labels (G@2,D@2); enddef;
vardef sloped_mid_biserif(suffix $,$$,@) % serif at |z$| for stroke from |z$$|
(expr darkness,drop) suffix modifier =
pickup crisp.nib; numeric bracket_height; pair downward;
bracket_height=if dark.modifier: 1.5 fi\\ bracket;
if y$<y$$: y.G@2=min(y$+slab+bracket_height,y$$);
top y@1-slab-.5drop=bot y@0+eps=tiny.bot y$; downward=z$-z$$;
if y@1>y.G@2: y.G@2:=y@1; fi
else: y.G@2=max(y$-slab-bracket_height,y$$);
bot y@1+slab+.5drop=top y@0-eps=tiny.top y$; downward=z$$-z$;
if y@1<y.G@2: y.G@2:=y@1; fi fi
y@3=y@2;
z@0=.5[z.G@0,z.D@0]; y.G@0=y.D@0;
forsuffixes @@= @2,@3:
z@@=.5[z.G@@,z.D@@]; y.G@@=y.D@@-drop;
endfor
%z@3=z@2=whatever[z$,z$$]; z@0=whatever[z$,z$$];
z.D@2+penoffset downward of currentpen =
z.D$l+penoffset downward of pen_[tiny.nib]+whatever*downward;
z.D@0=z.D$+whatever*downward; z.D@3=z.D@0+whatever*downward;
if x.D@3<x.D@2+eps: x.D@3:=x.D@2+eps; fi
z.G@2-penoffset downward of currentpen =
z.G$r-penoffset downward of pen_[tiny.nib]+whatever*downward;
x.G@0=x.G$; z.G@3=z.G@0+whatever*downward;
if x.G@3>x.G@2-eps: x.G@3:=x.G@2-eps; fi
pair base; ypart base=y@1; base=z$+whatever*downward;
filldraw z.G@2{z$-z$$}
...darkness[base,z@2]{z.D@2-z.G@2}
...{z$$-z$}z.D@2--z.D@3--z.D@0--z.G@0--z.G@3--cycle; % the serif
labels (G@2,D@2); enddef;
def dish_biserif(suffix $,$$,@)(expr left_darkness,left_jut)
(suffix @@@)(expr mid_darkness)
(suffix @@)(expr right_darkness,right_jut) suffix modifier =
serif(G$,G$$,@,left_darkness,-left_jut) modifier;
mid_biserif($,$$,@@@,mid_darkness) modifier;
serif(D$,D$$,@@,right_darkness,right_jut) modifier;
if dish>0: pickup tiny.nib; numeric dish_out,dish_in;
if y$<y$$: dish_out=bot y$; dish_in=dish_out+dish; let rev_=reverse;
else: dish_out=top y$; dish_in=dish_out-dish; let rev_=relax; fi
erase fill rev_
((x@1,dish_out)..(x$,dish_in){right}..(x@@1,dish_out)--cycle);
fi enddef;
def nodish_biserif(suffix $,$$,@)(expr left_darkness,left_jut)
(suffix @@@)(expr mid_darkness)
(suffix @@)(expr right_darkness,right_jut) suffix modifier =
serif(G$,G$$,@,left_darkness,-left_jut) modifier;
mid_biserif($,$$,@@@,mid_darkness) modifier;
serif(D$,D$$,@@,right_darkness,right_jut) modifier; enddef;
vardef sloped_biserif.l(suffix $,$$,@)(expr darkness,jut,drop)
(suffix @@)(expr mid_darkness) =
sloped_serif.l(G$,G$$,@,darkness,jut,drop);
sloped_mid_biserif($,$$,@@,mid_darkness,drop);
if drop>0: erase fill z.D@@0--top z.D@@0
--(x@2r,top y.D@@0)--z@2r--cycle; fi % erase excess at top
enddef;
vardef sloped_biserif.r(suffix $,$$,@)(expr darkness,jut,drop)
(suffix @@)(expr mid_darkness) =
sloped_serif.r(D$,D$$,@,darkness,jut,drop);
sloped_mid_biserif($,$$,@@,mid_darkness,-drop);
if drop>0: erase fill z.D@@0--top z.D@@0
--(x@2r,top y.D@@0)--z@2r--cycle; fi % erase excess at top
enddef;
def f_double_stroke(suffix $,$$,@,left_serif,mid_serif,right_serif)(expr left_jut,right_jut)=
pickup tiny.nib; bot y$=0; pen_duplicate(@0,@0',@1);
penpos@0(x$r-x$l,0); x@0l=x$l; top y@0=x_height;
pickup fine.nib; pos@0'(x$r-x$l+tiny,180); % removed stem_corr GFR
y@0'=y@0; lft x@0'r=tiny.lft x$l;
penpos@1(x@0'l-x@0'r,180); x@1=x@0'; y@1+.5vair=.5[x_height,h];
pos@2(vair,90); top y@2r=h+oo;
if serifs: x@2=.6[x.G@1,x$$r]; (x@,y@2r)=whatever[z@2l,z.G@1l];
x@2r:=min(x@,.5[x@2,x$$r]); pos@3(hair,0); bulb(@2,@3,$$); % bulb
else: x@2=.6[x.G@1,x$$]; y.G@1l:=1/3[y.G@1l,y@2l]; fi
pickup tiny.nib;
Delta_x = min(hround(interspace+.5stem'),x@2r-x.G@1l);
double filldraw stroke z$e--z@0e; % double stem
define_upper(D@2,D@0',super_arc.l(G@1,@2));
filldraw stroke z.D@0'e--z.D@2e; % inner stroke
pickup fine.nib;
if serifs: filldraw stroke z.G@0'e--z.G@1e & super_arc.e(G@1,@2); % arc
dish_biserif($,@0,left_serif,1/3,left_jut,mid_serif,1/3,right_serif,1/3,right_jut); % serif
else: filldraw stroke z.G@0'e--z.G@1e & super_arc.e(G@1,@2)
& term.e(@2,$$,right,.9,4); % arc and terminal
mid_biserif($,@0,mid_serif,1/3); fi % terminal
penlabels(G@0,D@0,G@1,D@1,@2,D@2); enddef;
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