1 files changed, 70 insertions, 0 deletions
diff --git a/metapost/context/base/mp-func.mpiv b/metapost/context/base/mp-func.mpiv
new file mode 100644
index 000000000..6ce7ee82a
--- /dev/null
+++ b/metapost/context/base/mp-func.mpiv
@@ -0,0 +1,70 @@
+%D \module
+%D   [       file=mp-func.mp,
+%D        version=2001.12.29,
+%D          title=\CONTEXT\ \METAPOST\ graphics,
+%D       subtitle=function hacks,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See licen-en.pdf for
+%C details.
+
+%D Under construction.
+
+if known context_func : endinput ; fi ;
+
+boolean context_func ; context_func := true ;
+
+string mfun_pathconnectors[] ;
+
+mfun_pathconnectors[0] := ","   ;
+mfun_pathconnectors[1] := "--"  ;
+mfun_pathconnectors[2] := ".."  ;
+mfun_pathconnectors[3] := "..." ;
+
+vardef mfun_draw_function (expr f) (expr u, t, b, e, s) = save x ; numeric x ;
+    for xx := b step s until e :
+        hide (x := xx ;)
+        if xx > b :
+            scantokens(mfun_pathconnectors[f])
+        fi
+        (scantokens(u),scantokens(t))
+    endfor
+enddef ;
+
+def punkedfunction = mfun_function (1) enddef ;
+def curvedfunction = mfun_function (2) enddef ;
+def tightfunction  = mfun_function (3) enddef ;
+
+vardef mfun_constructedpath (expr f) (text t) =
+    save ok ; boolean ok ; ok := false ;
+    for i=t :
+        if ok :
+            scantokens(mfun_pathconnectors[f])
+        else :
+            ok := true ;
+        fi
+        i
+    endfor
+enddef ;
+
+def punkedpath = mfun_constructedpath (1) enddef ;
+def curvedpath = mfun_constructedpath (2) enddef ;
+def tightpath  = mfun_constructedpath (3) enddef ;
+
+vardef mfun_constructedpairs (expr f) (text p) =
+    save i ; i := -1 ;
+    forever :
+        exitif unknown p[incr(i)] ;
+        if i>0 :
+            scantokens(mfun_pathconnectors[f])
+        fi
+        p[i]
+    endfor
+enddef ;
+
+def punkedpairs = mfun_constructedpairs (1) enddef ;
+def curvedpairs = mfun_constructedpairs (2) enddef ;
+def tightpairs  = mfun_constructedpairs (3) enddef ;