%telspb%
% generate characters filled with tiny dots
input telmode;
%mode:=proof;
%boolean testing; testing := true;
font_size 72pt#;
slant:=0;
pen_width#:=2.5pt#;
% Following code(with minor modifications) is taken from the article,
% The ABC's of Special Effects by Georgia K. M. Tobin,
% that appeared in TUGboat, Volume 9(1988), No. 1
vardef special_effects=
% creates characters filled with tiny dots.
cullit;
picture Normalchar;
Normalchar:=currentpicture;
clearit;
% Depending on the output device, pen size (0.5pt) may need to be
% changed.
pickup pencircle scaled 0.5pt;
filldraw (0,-d)--(w,-d)--
(w,h)--(0,h)--cycle;
picture Blackbox;
Blackbox:=currentpicture;
picture Reversevideo;
Reversevideo:=Blackbox-Normalchar;
clearit;
% Depending on the output device,stepsizes(u/4 and uh/4) may need to be
% changed.
for g=0 step u/4 until w:
for f=-d step uh/4 until h:
draw(g,f);
endfor;
endfor;
picture Dottedoverlay;
Dottedoverlay:=currentpicture;
currentpicture:=Dottedoverlay-Reversevideo;
enddef;
input telparam;
%%
