--- loncom/html/adm/help/tex/Print_Tricks.tex	2005/09/07 10:43:33	1.1
+++ loncom/html/adm/help/tex/Print_Tricks.tex	2005/09/29 21:13:07	1.6
@@ -1,6 +1,6 @@
 \label{Print_Tricks}
 
-When you print a LonCAPA resource, the XML of your resource is translated into
+When you print a LON-CAPA resource, the XML of your resource is translated into
 LaTeX.  The LaTeX is then processed and turned into a PDF document which can 
 be displayed with your browser's Acrobat plugin and subsequently printed.
 
@@ -14,35 +14,80 @@ it, please go to  http://bugs.lon-capa.o
 General information about printing within LonCAPA is also available: 
 \ref{Print_Resource}
 
-\section{\&prettyprint and \&dollarformat look ugly}
+\emph{The print rendition  of some Perl functions looks ugly }
+
+In particular these functions are:
+\begin{itemize}
+   \item \&prettyprint
+   \item \&dollarformat
+   \item \&xmlparse
+   \item \&chemparse
+\end{itemize}
+
+
 To make these two functions work correctly within the print translator, it is
-necessary to wrap them within a <DISPLAY> tag.  For example:
+necessary to wrap them within a <display> tag.  For example:
 
 \begin{verbatim}
 <p>
-If I had <display>&dollarformat(100)</display>
+If I had <display>&prettyprint(100,'$2f')</display>
 </p>
 \end{verbatim}
 
-Note that the <display> tags must be tightly wrapped around the function call or
-you will get a syntax error in web presentation mode.
+Note that the \texttt{<display>} tags must be tightly wrapped around the function call or
+you will get a syntax error in web presentation mode.  For additional information
+about cases where you must use \texttt{<display>}, see ``Variables with tags don't print
+correctly'' below.
+
 
+\emph{Image placement and alignment and text wrapping is wrong}
 
-\section{Image placement and alignment is wrong}
 Unfortunately this is due to a large difference between the LaTeX and HTML page
 layout model.  In HTML images are placed exactly where you ask them to be placed.  
-In LaTeX, images are considered {\em floats}, which LaTeX will place for you.
-There are a few print options you can try to place images approximately where you 
-want them relative to sorrounding text \ref{Print_Options}.
+In LaTeX, images are considered {\em floats}, which LaTeX will place for you.  
+Some of the common html tricks, using tables e.g. to control text wrapping around
+figures, will not always work in print mode; especially if the text is to the
+right side of the figure in the table.
+
+The alignment choice 
+affects whether or not the print rendering engine attempts to get text to wrap around the 
+image.  With \texttt{align=``right''} or \texttt{align=``left''}, the print rendering engine
+attempts to use the {\em wrapfigure} 
+environment to place text around the figure at the
+appropriate side.  If a figure is in a table, then the print engine, by default, 
+the print engine will use wrapfigure, set the alignment to ``right'' 
+unless you override it.  Otherwise, the default alignment is ``bottom'' as it 
+is for html, and no wrapping will occur.  
+
+\verb+\parpic+ style wrapping is also available by specifying \texttt{TeXwrap=``parpic''}
+ in the <img> tag.  In some limited casese this gives a better result.
+
+
+Other print specific <img> tag attributes are available. \ref{Print_Options}.
+
+
+
+\emph{Variables with tags don't print correctly}
 
-\section{Variables with tags don't print correctly}
 If a variable contains XML, in general it is necessary to force the XML parser
 to make a pass over the contents of the contents of the variable prior to rendering
-the section of the resource that contains that substitution.  For example:
+the section of the resource that contains that substitution. When output,
+those variables must be bracketed inside of \texttt{<display> </display>} tags.
+ For example:
 
 \begin{verbatim}
-
+<problem>
+<script type="loncapa/perl">
+$a = &xmlparse('<br />');
+</script>
+<startouttext />
+<p>This is a break <display>$a</display> and then some more text</p>
+<endouttext />
+</problem>
 \end{verbatim}
 
+Without the xmlparse call and the display tag bracketing the variable, this
+problem will display on the web just fine, but print incorrectly.
+