Misplaced figure

Misplaced figure

[Rogers, Michael K]

Hi,

I wanted to start a proof with "Proof:" in italics and place a figure next to the right margin.  There are many ways to accomplish this, but my normal way, {\it Proof:\/}, fails.  Is this a bug or am I making a mistake?

\starttext
\startuseMPgraphic{ProofPQR}
numeric u; u:=2.5cm;
draw ((0, 0)--(1,0)--(1, 0.7)) scaled u withpen pencircle;
dotlabel.bot(textext("$P$"),(0,0)*u);
dotlabel.bot(textext("$R$"),(1,0)*u);
dotlabel.rt(textext("$Q$"),(1,0.7)*u);
\stopuseMPgraphic

% MISPLACED
\placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
{\it Proof:\/}
\input knuth

\hairline
% WORKS
\placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
%{\it Proof:\/}
\input knuth

\hairline
% WORKS
\placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
\strut{\it Proof:\/}
\input knuth
\stoptext

Thanks,

Michael

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Re: Misplaced figure

[Wolfgang Schuster]

Am 09.10.2012 um 13:47 schrieb "Rogers, Michael K" <mroge02@emory.edu>:

> Hi,
> 
> I wanted to start a proof with "Proof:" in italics and place a figure next to the right margin.  There are many ways to accomplish this, but my normal way, {\it Proof:\/}, fails.  Is this a bug or am I making a mistake?
> 
> \starttext
> \startuseMPgraphic{ProofPQR}
> numeric u; u:=2.5cm;
> draw ((0, 0)--(1,0)--(1, 0.7)) scaled u withpen pencircle;
> dotlabel.bot(textext("$P$"),(0,0)*u);
> dotlabel.bot(textext("$R$"),(1,0)*u);
> dotlabel.rt(textext("$Q$"),(1,0.7)*u);
> \stopuseMPgraphic
> 
> % MISPLACED
> \placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
> {\it Proof:\/}
> \input knuth
> 
> \hairline
> % WORKS
> \placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
> %{\it Proof:\/}
> \input knuth
> 
> \hairline
> % WORKS
> \placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
> \strut{\it Proof:\/}
> \input knuth
> \stoptext

That’s a common problem when you use a font switch at the begin of a paragraph,
you can avoid this when you force horizontal mode with \dontleavehmode or \strut
before the begin of the group. You can avoid this also when you use \italic{…} etc.
instead of {\it …} but the best solution in your example is to create a proof
environment  which prints “Proof: ” as title for the environment.

\defineenumeration
  [proof]
  [text=Proof:,
   headstyle=italic,
   number=no,
   alternative=serried,
   width=fit,
   distance=.5em]

\startuseMPgraphic{ProofPQR}
numeric u; u:=2.5cm;
draw ((0, 0)--(1,0)--(1, 0.7)) scaled u withpen pencircle;
dotlabel.bot(textext("$P$"),(0,0)*u);
dotlabel.bot(textext("$R$"),(1,0)*u);
dotlabel.rt(textext("$Q$"),(1,0.7)*u);
\stopuseMPgraphic

\starttext

\placefigure[right,none]{}{\useMPgraphic{ProofPQR}}
\startproof
\input knuth
\stopproof

\stoptext

Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________