%% syntaxe : arrowpaths --> depose sur la pile les 2 sous chemins 
%% en provenance du chemin courant necessaires a gere_arrowhead
/arrowpaths {
3 dict begin
   currentcppathobj 
   /path exch def
%   cvx exec
%   /les_xy exch def
%   /les_t exch def
%   /ell les_xy longueur def %% longueur de la courbe en picas
%   /ell path cpathlongueur def %% longueur de la courbe en picas

   %% pour visualiser
   %/les_XY path cpathpointstable {ptojpoint} papply def
   %/les_t path cpathparamtable {ptojpoint} papply def
   %les_t {les_t les_XY interpolparamfunct times} apply
   %les_t length ==

   path cpathlongueur ahlength lt {
      50 path splitcpath
   } {
      0 100 .01 {
         path cpathelongueur ahlength sub
      } dich_solve /t1 exch def
   
      0 100 .01 {
         path cpathslongueur ahlength sub
      } dich_solve /t2 exch def
      t2 path splitcpath pop cppathtocpath reversecpathobj
      t1 path splitcpath exch pop cppathtocpath 
   } ifelse

%% 	 0 100 .01 {
%% 	    path cpathelongueur ahlength sub
%% 	 } dich_solve /t1 exch def
%%    
%% 	 0 100 .01 {
%% 	    path cpathslongueur ahlength sub
%% 	 } dich_solve /t2 exch def
%% 	 t2 path splitcpath pop cppathtocpath reversecpathobj
%% 	 t1 path splitcpath exch pop cppathtocpath 

end
} def