Bdtyktl

Why is there a white space on the left side?

documentclass{standalone}

usepackage{asymptote}

begin{document}

noindent

begin{asy}

size(10cm,10cm);

draw((0,0)--(100,100));

draw((0,100)--(100,0));

dot((50,50));

end{asy}

end{document}

Three unprotected end-of-lines in asymptote.sty (marked with %<---).

documentclass{standalone}

usepackage{asymptote}

makeatletter

defasy@init{%<---

  defASYlatexdir{}%<---

  ifxasylatexdiremptyelse

    defASYlatexdir{asylatexdir/}%

  fi

  ifxasydiremptyelse

    defASYasydir{asydir/}%

  fi

  defASYprefix{ASYlatexdirASYasydir}%

}

renewcommandasy[1]{%

  stepcounter{asy}%

  setkeys{ASYkeys}{#1}%

  ifASYattach

    ASYinlinefalse

  fi

  asy@init

  immediatewriteAsyPreStream{%

    noexpandInputIfFileExists{%

      ASYprefixnoexpandjobname-thec@asy.pre}{}{}%

  }%<---

  asy@write@graphic@header

  letThisAsymptoteWriteAsyLine

  ProcessAsymptote{asy}%

}

makeatother



begin{document}



begin{asy}

size(10cm,10cm);

draw((0,0)--(100,100));

draw((0,100)--(100,0));

dot((50,50));

end{asy}



end{document}

Note that noindent is not necessary.

How to find them? I removed noindent that does nothing with standalone, replacing it with

tracingcommands=1 tracingmacros=1

I compiled with pdflatex, ran asy and compiled again. The .log file is the searched for {blank space}:

asy@init -> def ASYlatexdir {} ifx asylatexdir empty else def ASYlatex

dir {asylatexdir /}fi ifx asydir empty else def ASYasydir {asydir /}f

i def ASYprefix {ASYlatexdir ASYasydir }

{blank space  }

{def}

{blank space  }

{def}

{immediate}



ASYprefix ->ASYlatexdir ASYasydir 



ASYlatexdir ->



ASYasydir ->

{blank space  }



asy@write@graphic@header ->immediate openout AsyStream =ASYasydir jobname

It is apparent that asy@init is responsible and indeed its definition is

defasy@init{

  defASYlatexdir{}

  ifxasylatexdiremptyelse

    defASYlatexdir{asylatexdir/}%

  fi

  ifxasydiremptyelse

    defASYasydir{asydir/}%

  fi

  defASYprefix{ASYlatexdirASYasydir}%

}

showing two missing % protections.

Redefine the command and retry. Darn! There's still a blank space!

ASYasydir ->

{blank space  }



asy@write@graphic@header ->immediate openout AsyStream =ASYasydir jobname

Look for asy@write@graphic@header in asymptote.sty: we find it in the definition of asy:

newcommandasy[1]{%

  stepcounter{asy}%

  setkeys{ASYkeys}{#1}%

  ifASYattach

    ASYinlinefalse

  fi

  asy@init

  immediatewriteAsyPreStream{%

    noexpandInputIfFileExists{%

      ASYprefixnoexpandjobname-thec@asy.pre}{}{}%

  }

  asy@write@graphic@header

  letThisAsymptoteWriteAsyLine

  ProcessAsymptote{asy}%

}

Fix it and check again. Hurray! No spaces!