Hi, I am back to trying Metapost. I spent sometime yesterday and today learning about clipping, buildcycles etc. to fill areas with patterns. I think I will try to write a simple tutorial with it. Meanwhile, I just updated my installation of Context minimals. The following simple Metapost code does not compile with MKIV, but compiles okay with MKII. \setuppapersize[letter][letter] \setupcolors[state=start] \setuppagenumbering[state=stop] \starttext \startuseMPgraphic{Filling} u := 1cm; w:= 2pt; %Axes path xaxis; path yaxis; xaxis := (0,0)--(12,0) scaled u; yaxis := (0,0)--(0,12) scaled u; path demand; path AC; demand := function (1,"x","10-x",0,10,1) scaled u; AC := function(1,"x","2+8/x",1,10,0.1) scaled u; drawarrow xaxis withpen pencircle scaled w; drawarrow yaxis withpen pencircle scaled w; draw demand withpen pencircle scaled w withcolor 0.5red; draw AC withpen pencircle scaled w withcolor 0.5green; fill fullcircle scaled u shifted (4*u,5*u) withcolor 0.1[white,blue] ; label(btex \tfb S1 etex,(4,5)*u); \stopuseMPgraphic \midaligned{\useMPgraphic{Filling}} -------------------------------------------------------------------------------------------------------- The LOG file is: This is LuaTeX, Version beta-0.44.0-2009103007 \write18 enabled. (TestFile.tex ConTeXt ver: 2009.11.18 21:51 MKIV fmt: 2009.11.18 int: english/english system : cont-new loaded (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/cont-new.tex systems : beware: some patches loaded from cont-new.tex (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/cont-new.mkiv)) system : cont-fil loaded (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/cont-fil.tex loading : ConTeXt File Synonyms ) system : cont-sys.rme loaded (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/user/cont-sys.rme (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/type-tmf.tex (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/type-tmf.mkiv)) (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/type-siz.tex (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/type-siz.mkiv)) (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/type-otf.tex (/Applications/ConTeXtMinimals/tex/texmf-context/tex/context/base/type-otf.mkiv))) system : TestFile.top loaded (TestFile.top) fonts : preloading latin modern fonts bodyfont : 12pt rm is loaded language : language en is active color : system all is global activated systems : begin file TestFile at line 5 mplib : initializing instance 'metafun' using format 'metafun' mplib : loading 'metafun.mp' from '/Applications/ConTeXtMinimals/tex/texmf-cache/luatex-cache/context/3fc847143b06f084e10e73c8fbdf4ae2/formats/cont-en-metafun.mem' ) *