%% File LXBBASE copied and modified from AMSYB by American Mathematical Society %% in order to cope with the necessities of the slides fonts %% %% Claudio Beccari 2007 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % Changes made for version 2.1: % Fixed Problems with smode in draw_outlines and showpoints % Stefan Lindner, 21-March-1991 % Fixed Problems with serifs at small point sizes % Stefan Lindner and Lutz Birkhahn, 14-April-91 vardef curve@#(expr a,one,b,two)= save x,y; z0=if(str@#="br")or(str@#="tl"):(xpart b,ypart a) else:(xpart a,ypart b) fi; z1=one[a,z0]; z2=two[b,z0]; a ..controls z1 and z2.. b enddef; vardef reversecurve@#(expr a,one,b,two)=reverse curve@#(a,one,b,two) enddef; vardef beak(expr injoin,intip,outtip,indent,outjoin,tense)= save x,y,t,toward,onright,ref; pair toward; boolean onright; path ref; onright=(xpart intip>xpart injoin); toward=if onright: right else: left fi; z1=intip if onright:-else:+ fi (inbeak,0); z2=outtip if onright:-else:+ fi (outbeak,0); ref=outjoin{toward}...(z1 if onright:+else:- fi (2*abs(outjoin-injoin),0)); y4=.5[ypart outjoin,ypart indent]; z3=ref intersectionpoint ((0,y4)--(w,y4)); (t3,t4)=ref intersectiontimes ((0,y4)--(w,y4)); injoin{toward}..tension tense..z1--intip--outtip--z2...indent{-toward}... {-(direction t3 of ref)}z3--subpath(t3,0) of ref enddef; boolean its_a_leftserif; vardef full_serif_points@# (expr A,B,Bl,Br,leftlength,rightlength,midbracket_pull)= %%%% min_limit(join_radius)(.5serif_thickness); % -sl 14.04.91 (z1-B)=whatever*(A@#-B@#); (z1l-Bl)=whatever*(A@#-B@#); (z1r-Br)=whatever*(A@#-B@#); y2=y2l=y2r=ypart A; y1=y1l=y1r=y3=y4=ypart A if ypart A>ypart B:-else:+fi serif_thickness; x5=x2=.5[x1l,x1r]; y5=entasis[y2l,y1l]; if its_a_leftserif:x3=x2l=x1l-round(leftlength+serif_constant_amt); else:x4=x2r=x1r+round(rightlength+serif_constant_amt); fi enddef; vardef leftserif@#(expr A,B,Bl,Br,alength,midbracket_pull)= its_a_leftserif:=true; save x,y,p; path p[]; min_limit(join_radius)(.5serif_thickness); % -sl 14.04.91 full_serif_points@#(A,B,Bl,Br,alength,0,midbracket_pull); p0:=Bl{z1l-Bl}...{z3-z1l}z3; if midbracket_pull<>0: z3'l=z1l; pos3'(alength+5pt,.5[angle(B-A),if ypart A>ypart B:-fi 180]); z8'=p0 intersectionpoint (z3'l--z3'r); z8=(midbracket_pull-eps)[z8',z1l];fi if ypart A>ypart B:reverse fi ((if midbracket_pull=0:p0 else:Bl{z1l-Bl}...z8...{z3-z1l}z3 fi if softpath:)softjoin(z3--z2l)softjoin(else:--fi z2l..z5{right})) enddef; vardef rightserif@#(expr A,B,Bl,Br,alength,midbracket_pull)= its_a_leftserif:=false; save x,y,p; path p[]; min_limit(join_radius)(.5serif_thickness); % -sl 14.04.91 full_serif_points@#(A,B,Bl,Br,0,alength,midbracket_pull); p4:=z4{z1r-z4}...{Br-z1r}Br; if midbracket_pull<>0: z4'l=z1r; pos4'(alength+5pt,.5[angle(B-A),0]); z9'=p4 intersectionpoint (z4'l--z4'r); z9=(midbracket_pull-eps)[z9',z1r];fi if ypart A>ypart B:reverse fi ((z5{right}..z2r if softpath:)softjoin(z2r--z4)softjoin(else:--fi if midbracket_pull=0:p4 else:z4{z1r-z4}...z9...{Br-z1r}Br fi)) enddef; vardef fullserif@#(expr A,B,Bl,Br,leftlength,rightlength,midbracket_pull)= save x,y,p; path p[]; p1=rightserif(A,B,Bl,Br,rightlength,midbracket_pull); p2=leftserif(A,B,Bl,Br,leftlength,midbracket_pull); if ypart A>ypart B:(p1--p2)else:(p2--p1)fi enddef; vardef straightarm@#(expr join,tip,heel,thickness,pull)= save x,y,toward,p; pair toward; path p; toward=if (str@#="br")or(str@#="tr"):right else:left fi; z1=tip if (str@#="br")or(str@#="tr"):- else:+ fi (thickness,0); z2=point .5 of (join{toward}...{tip-heel}z1); z1-z3=whatever*(tip-heel); y3=ypart join; p=z1{z3-z1}...{join-z3}join; z4=pull[z3,point .5 of p]; if (str@#="br")or(str@#="tl"):reverse fi (join{toward}...z4...{tip-heel}z1--tip--heel) enddef; vardef constant_angle(expr top_pt,bot_pt,stem)suffix \$= save theta; theta=if str\$="lr":-else:+fi (angle(length(top_pt-bot_pt) +-+ stem,stem)); angle(top_pt-bot_pt)+theta-90 enddef; vardef pos@#(expr b,d) = (x@#r-x@#l,y@#r-y@#l)=(b,0)rotated d;x@#=.5(x@#l+x@#r);y@#=.5(y@#l+y@#r)enddef; vardef mpos(text t)(expr b,d)=forsuffixes \$=t:pos\$(b,d); endfor enddef; def draw_outlines= pickup pencircle scaled 1.5linethickness; for n=1 upto 3:if known p[n]:draw p[n];fi if known p[n]':draw p[n]';fi if known p[n]'':draw p[n]'';fi endfor if numeric mode: % -sl 21.03.1991 if mode=proof: drawgrid; fi fi % -sl 21.03.1991 enddef; def drawgrid= pickup pencircle scaled 1; for y:=h,xheight,0,-descender: draw (0,y)--(w,y); endfor for y:=unit step unit until (cap+.5unit): draw (0,y)--(w,y); endfor for y:=unit step -unit until (-d-.5unit): draw (0,y)--(w,y); endfor for x:=0 step unit until (w+.5unit): draw (x,-d)--(x,h); endfor enddef; vardef onaline(suffix a,b)(text t)=forsuffixes \$=t:z\$=whatever[z.a,z.b]; endfor enddef; def showpoints(text t)= if numeric mode: % -sl 21.03.1991 if mode=proof:pickup pencircle scaled 3; forsuffixes \$:=t:forsuffixes s:=l,,r:if known z\$.s:draw z\$s;fi endfor endfor pickup pencircle scaled 1; penlabels(t); fi fi % -sl 21.03.1991 enddef; vardef inlimit(text amt)(expr lowerlimit,upperlimit)=save this; this:=max(amt,lowerlimit); this:=min(this,upperlimit);this enddef; let semi_ = ;; let colon_ = :; let endchar_ = endchar; def iff expr b = if b:let next_=use_it else:let next_=lose_it fi; next_ enddef; def use_it = let : = restore_colon; enddef; def restore_colon = let : = colon_; enddef; def lose_it = let endchar=fi; let ;=restore_endchar semi_ if false enddef; def restore_endchar=let ;=semi_; let endchar=endchar_; enddef; def always_iff expr b = use_it enddef; boolean wanted[]; % for x:="I": % wanted[byte x]:=true; endfor % this allows specifying only those characters which are to be shown % the chars can be specified inside of quotes("c") or as a number(23) def OK expr x=known wanted[byte x] enddef; % let iff=always_iff; % allows testing of all chars in the file def min_limit(text this)(expr limit)=if this>limit:save this;this=limit;fi enddef; % def define_adj_whole_pixels(text t)= % forsuffixes \$:=t: \$:=hround(max(eps,\$.#-linethickness#)*hppp); endfor enddef; def define_min_adj_whole_pixels(text t)= forsuffixes \$:=t: \$:=max(lowres_min,hround(max(eps,\$.#-linethickness#)*hppp)); endfor enddef; def bool(text t)=boolean t; t enddef; def vpix(text t)(text tt)= t:=tt; t:=vround(tt.#*hppp); enddef; % whole v pix def wpix(text tt)(text t)= forsuffixes \$:=t: \$:=hround(tt.#*hppp); endfor enddef; % whole pixels def adjpix(text tt)(text t)= % adjusted pixels forsuffixes \$:=t: \$:=hround(max(eps,tt.#*hppp-linethickness)); endfor enddef; def minadjpix(text ttt)(text tt)(text t)= % adjusted pixels with a minimum forsuffixes \$:=t: \$:=max(ttt,hround(tt.#*hppp-linethickness)); endfor enddef; def highres_lowres(text t)(expr a,b)=t:=if lowres:b else:a fi enddef;