prerex (3Mar)

git-svn-id: svn://tug.org/texlive/trunk@33078 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 272 insertions, 283 deletions

diff --git a/Master/texmf-dist/tex/latex/prerex/prerex.sty b/Master/texmf-dist/tex/latex/prerex/prerex.sty
index 3afe6755c5a..429c8171ecd 100644
--- a/Master/texmf-dist/tex/latex/prerex/prerex.sty
+++ b/Master/texmf-dist/tex/latex/prerex/prerex.sty
@@ -11,6 +11,11 @@
 %% version 2003/12/01 or later.
 %% 
 %% This work has the LPPL maintenance status "author-maintained".
+%%
+\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+\ProvidesPackage{prerex}[2014/03/02 v6.4.1 LaTeX style for prerequisite charts, pgf version]
+%
+% Changelog is at the end of the file.
 %
 % Instructions supported inside  \begin{chart} ... \end{chart}:
 %
@@ -22,7 +27,7 @@
 %   dotted arrow: \coreq x0,y0,x1,y1:     \coreqc x0,y0,x1,y1;curvature:
 %   dashed arrow: \recomm x0,y0,x1,y1:    \recommc x0,y0,x1,y1;curvature:
 %
-%   \text x,y: {line of text}
+%   \text x,y: {lines of text}
 %
 %   \grid      coordinate grid background
 %
@@ -36,198 +41,7 @@
 %   \boldbox    in-line bold course box
 %   \dottedbox  in-line dotted course box
 %
-% The following defaults are defined in prerex.sty (but may be re-defined by the user):
-%
-%   \newcommand{\DefaultCurvature}{20}    
-%
-%     where the argument should be in the range 0-100; 0 means no curvature.
-%
-%   \newcommand{\CourseURL}[3]{file:#3.html}
-%
-%     where the arguments supplied at the call are the x and y coordinates
-%     and the course code.
-%
-%   \newcommand{\background}{yellow!15}
-%
-%   \setlength{\unit}{5.7816pt}  length of a coordinate unit; gives 10 pixels per unit at 125dpi
-%   \newcommand{\dpi}{125}
-%   \newcommand\PixelsPerUnit{10}
-%   \setcounter{diagheight}{75}  but reduced to 65 in landscape mode
-%   \newcommand{\solidwidth}{0.5pt}
-%   \newcommand{\dottedwidth}{0.8pt}
-%   \newcommand{\dashedwidth}{0.5pt}
-%   \newcommand{\boldwidth}{1.0pt}
-%   \newcommand{\smallersize}{\relsize{-2}}
-%   \newcommand{\baselineAdj}{-0.5ex}
-%
-% The nominal diagram width is 10 + (\textwidth divided by \unit).
-%
-\NeedsTeXFormat{LaTeX2e}[1995/12/01]
-\ProvidesPackage{prerex}[2014/02/27 v6.4.0 LaTeX style for prerequisite charts, pgf version]
-
-% Changelog:
-%
-%  Version 6.4.0
-%
-%    Revise arrows for tikz version 3.0.0
-%
-%  Version 6.3.6
-%
-%    Allow line breaks in \text boxes.
-%
-%  Version 6.3.5
-%
-%    Fix font usage to work with mweights.sty.
-%
-%  Version 6.3.4
-%
-%    Timetable and course code in bold for required boxes.
-%
-%  Version 6.3.3
-%
-%    Remove background colour from standalone boxes.
-%    \smallersize increased to \relsize{-2}.
-%
-%  Version 6.3.2
-%
-%    Use pgf layers to keep grid below arrows below boxes (thanks to Ryan Kavanagh).
-%    Add struts to stand-alone \...box commands.
-%
-%  Version 6.3
-%
-%    Allow "opt" course boxes (with dotted outlines).
-%
-%  Version 6.2
-%
-%    Allow for multi-line "timetable" arguments by using nested tabular environments.
-%
-%  Version 6.1.0
-%
-%    Added commands to specify background color of non-mini course boxes.
-%
-%  Version 6.0.6
-%
-%    Provide \textbullet at mid-point of edges when grid is on.
-%
-%  Version 6.0.5
-%
-%    Changed TARGET attribute in AREA outputs to "new".
-%    New configuration command \baselineAdj.
-%
-%  Version 6.0.4
-%
-%    Added missing initializations of @dy to curved...  macros.
-%
-%  Version 6.0.3
-%
-%    Added required ALT tag to AREA outputs.
-%
-%  Version 6.0
-%  Version 5.7
-%
-%    added implementation details to documentation
-%    generated script now only crops the chart image
-%
-%  Version 5.6
-%  Version 5.5
-%
-%    version increased to keep pace with previewer/vprerex
-%
-%  Version 5.4
-%
-%    code clean-up
-%
-%  Version 5.3
-%
-%    produces an image-generating script in \jobname.sh
-%
-%  Version 5.2
-%
-%    use \grid and \foreach (tikz) instead of \multido
-%    half-course boxes now have a minimum height (5 units) to improve uniformity
-%
-%  Version 5.1
-%
-%    generates image-map data in \jobname_n.html for nth chart when n>1 
-%
-%  Version 5.0
-%
-%    also generates \jobname.html with image-map data for all node URLs
-%    new configuration commands \dpi and \PixelsPerUnit
-%    default \unit length adjusted to give 10 pixels per coordinate unit at 125 dpi
-%
-%  Version 4.4
-%
-%    increase ysep parameter to 1.8pt to separate course-code or text and arrow tails for minis 
-%    and text boxes
-%
-%  Version 4.3
-%
-%    introduce \smallersize configuration command
-%
-%  Version 4.2
-%
-%    using tinting with xcolor package to ease background-color changes 
-%
-%  Version 4.1
-%
-%  Version 4.0
-%
-%   Implement the \text command to place a line of text (centered at the coordinates) in a chart
-%
-%  Version 3.8.1:
-%
-%   adjust arraystretch factors to work with long-ascender fonts such as Futura
-%   adjust inner sep parameters to work with oblique/italic fonts
-%   remove workaround for pgf-1.10 bug described at
-%      http://sourceforge.net/forum/forum.php?thread_id=1621660&forum_id=477363
-%   require version 1.18 (or later) of pgf
-%
-%  Version 3.8:
-%
-%    require version 1.10 (or later) of pgf
-%
-%  Version 3.7:
-%
-%    anchor nodes must be non-null for latex/dvips
-%
-%  Version 3.6:
-%
-%    first pgf-based version
-%
-%  Version 3.5:
-%  Version 3.4:
-%
-%    introduce arrow borders to improve the appearance of crossing arrows
-%    change default widths to artifacts created when arrow borders 
-%      occlude box boundaries
-%
-%  Version 3.3:
-%
-%    arrows (as well as course boxes and minis) are hyperlinked with coordinate URIs
-%
-%  Version 3.2:
-%
-%  Version 3.1:
-%
-%  Version 3.0:
-%
-%   "anchor" hyperlinks are added to coordinate grid to allow computation of
-%      chart coordinates at mouse clicks 
-%
-%  Version 2.0:
-%
-%    CourseURL now takes 3 arguments
-%    box/mini coordinates displayed in (some) PDF viewers when grid on
-%
-%  Version 1.0.2:
-%
-%    using \relsize{-3} rather than \scriptsize
-%    using \textsf in \lightbox and \boldbox
-%
-%  Version 1.0.1:
-%
-%    using \RequirePackage rather than \usepackage (suggested by Herbert Voss)
+% The nominal diagram width is (\textwidth divided by \unit) + 10
 %
 
 \newlength{\unit}
@@ -240,11 +54,11 @@
 \RequirePackage{calc}
 \RequirePackage{pgf}[2013/12/18]
 \RequirePackage{tikz}\usetikzlibrary{arrows.meta}
-\RequirePackage{ifthen}
 \RequirePackage{textcomp}
 \RequirePackage{zref-savepos}
 \PassOptionsToPackage{urlcolor=black,colorlinks,raiselinks}{hyperref}
 \RequirePackage{hyperref}
+\RequirePackage{ifpdf}
 
 \RequirePackage{xcolor}
 \definecolor{light}{gray}{0.5}
@@ -252,9 +66,13 @@
 \definecolor{verylight}{gray}{0.85}
 \definecolor{white}{rgb}{1.0,1.0,1.0} % not transparent, hides grid
 
+\newcommand{\DefaultCurvature}{20} 
+%     where the argument should be in the range 0-100; 0 means no curvature.
 
-\newcommand{\DefaultCurvature}{20} % 0 for no curvature
 \newcommand{\CourseURL}[3]{file:#3.html}
+%     where the arguments supplied at the call are the x and y coordinates
+%     and the course code.
+
 \newcommand{\background}{yellow!15}
 
 \newcommand{\solidwidth}{0.5pt}
@@ -296,35 +114,38 @@
 % #4            horizontal delta
 % #5            vertical delta
 %
-\setcounter{xNW}{\dpi * \ratio{\zposx{gridOrigin_\thechart}sp}{1in}}% # of pixels from left edge to origin
-\addtocounter{xNW}{(#1-#4)*\PixelsPerUnit}% add # pixels from origin to node (-#4 units)
-\setcounter{xSE}{\dpi * \ratio{\zposx{gridOrigin_\thechart}sp}{1in}}%
-\addtocounter{xSE}{(#1+#4)*\PixelsPerUnit}% add # pixels from origin to node (+#4 units)
+\ifpdf
+  \setcounter{xNW}{\dpi * \ratio{\zposx{gridOrigin_\thechart}sp}{1in}}% # of pixels from left edge to origin
+  \addtocounter{xNW}{(#1-#4)*\PixelsPerUnit}% add # pixels from origin to node (-#4 units)
+  \setcounter{xSE}{\dpi * \ratio{\zposx{gridOrigin_\thechart}sp}{1in}}%
+  \addtocounter{xSE}{(#1+#4)*\PixelsPerUnit}% add # pixels from origin to node (+#4 units)
 
-\setcounter{yNW}{ \dpi * \ratio{\paperheight}{1in}}  % # of pixels for the whole page
-\addtocounter{yNW}{ 0 - \dpi * \ratio{\zposy{gridOrigin_\thechart}sp}{1in}} % subtract # pixels from bottom edge to origin
-\addtocounter{yNW}{0 - (#2 - #5) * \PixelsPerUnit } % subtract # of pixels from origin to node (-#5) 
-\setcounter{ySE}{ \dpi * \ratio{\paperheight}{1in}}
-\addtocounter{ySE}{0 - \dpi * \ratio{\zposy{gridOrigin_\thechart}sp}{1in}}
-\addtocounter{ySE}{0 - (#2 + #5) * \PixelsPerUnit } % subtract # of pixels from origin to node (+#5)
+  \setcounter{yNW}{ \dpi * \ratio{\paperheight}{1in}}  % # of pixels for the whole page
+  \addtocounter{yNW}{ 0 - \dpi * \ratio{\zposy{gridOrigin_\thechart}sp}{1in}} % subtract # pixels from bottom edge to origin
+  \addtocounter{yNW}{0 - (#2 - #5) * \PixelsPerUnit } % subtract # of pixels from origin to node (-#5) 
+  \setcounter{ySE}{ \dpi * \ratio{\paperheight}{1in}}
+  \addtocounter{ySE}{0 - \dpi * \ratio{\zposy{gridOrigin_\thechart}sp}{1in}}
+  \addtocounter{ySE}{0 - (#2 + #5) * \PixelsPerUnit } % subtract # of pixels from origin to node (+#5)
 
-\immediate\write\@imapfile{<area shape=rect coords="\thexNW,\theyNW,\thexSE,\theySE" href="\CourseURL{#1}{#2}{#3}" target="new" alt="#3">}%
+  \immediate\write\@imapfile{<area shape=rect coords="\thexNW,\theyNW,\thexSE,\theySE" href="\CourseURL{#1}{#2}{#3}" target="new" alt="#3">}%
+\fi
 }
 
 \pgfsetlayers{}
+
 \def\solidarrow{%
 \tikz[x=\unit,y=\unit,baseline=\baselineAdj]
-\draw[-Latex,line width =\solidwidth] (0,0) -- (4,0);
+\draw[-{Latex[length=4pt]},line width =\solidwidth] (0,0) -- (4,0);
 }
 
 \def\dottedarrow{%
 \tikz[x=\unit,y=\unit,baseline=\baselineAdj]
-\draw[-Latex,loosely dotted,line width=\dottedwidth] (0,0) -- (4,0);
+\draw[-{Latex[length=4pt]},loosely dotted,line width=\dottedwidth] (0,0) -- (4,0);
 }
 
 \def\dashedarrow{%
 \tikz[x=\unit,y=\unit,baseline=\baselineAdj]
-\draw[-Latex,dashed,line width=\dashedwidth] (0,0) -- (4,0);
+\draw[-{Latex[length=4pt]},dashed,line width=\dashedwidth] (0,0) -- (4,0);
 }
 
 \def\lightbox{%
@@ -350,7 +171,7 @@
 
 \def\@halfcourse#1,#2:#3#4#5{%
 \begin{pgfonlayer}{courses}%
-\node[draw,thin,fill=\background,rounded corners=2pt,inner ysep=0.5pt,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
+\node[draw,thin,fill=\background,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{0.8}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -366,7 +187,7 @@
 
 \def\@halfcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,thin,fill=#6,rounded corners=2pt,inner ysep=0.5pt,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
+\node[draw,thin,fill=#6,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{0.8}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -382,7 +203,7 @@
 
 \def\@reqhalfcourse#1,#2:#3#4#5{%
 \begin{pgfonlayer}{courses}%
-\node[draw,line width=\boldwidth,fill=\background,rounded corners=2pt,inner ysep=0.5pt,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
+\node[draw,line width=\boldwidth,fill=\background,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{0.8}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -398,7 +219,7 @@
 
 \def\@reqhalfcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,line width=\boldwidth,fill=#6,rounded corners=2pt,inner ysep=0.5pt,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
+\node[draw,line width=\boldwidth,fill=#6,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{0.8}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -415,7 +236,7 @@
 
 \def\@opthalfcourse#1,#2:#3#4#5{%
 \begin{pgfonlayer}{courses}%
-\node[draw,dotted,line width=\boldwidth,fill=\background,rounded corners=2pt,inner ysep=0.5pt,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
+\node[draw,dotted,line width=\boldwidth,fill=\background,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{0.8}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -431,7 +252,7 @@
 
 \def\@opthalfcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,dotted,line width=\boldwidth,fill=#6,rounded corners=2pt,inner ysep=0.5pt,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
+\node[draw,dotted,line width=\boldwidth,fill=#6,minimum height=\@unitmult](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{0.8}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -447,7 +268,7 @@
 
 \def\@fullcourse#1,#2:#3#4#5{%
 \begin{pgfonlayer}{courses}%
-\node[draw,thin,fill=\background,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,thin,fill=\background](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -463,7 +284,7 @@
 
 \def\@fullcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,thin,fill=#6,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,thin,fill=#6](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -479,7 +300,7 @@
 
 \def\@reqfullcourse#1,#2:#3#4#5{%
 \begin{pgfonlayer}{courses}%
-\node[draw,line width=\boldwidth,fill=\background,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,line width=\boldwidth,fill=\background](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -495,7 +316,7 @@
 
 \def\@reqfullcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,line width=\boldwidth,fill=#6,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,line width=\boldwidth,fill=#6](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -511,7 +332,7 @@
 
 \def\@fullcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,thin,fill=#6,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,thin,fill=#6](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -527,7 +348,7 @@
 
 \def\@optfullcourse#1,#2:#3#4#5{%
 \begin{pgfonlayer}{courses}%
-\node[draw,dotted,line width=\boldwidth,fill=\background,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,dotted,line width=\boldwidth,fill=\background](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -544,7 +365,7 @@
 
 \def\@optfullcoursec#1,#2:#3#4#5#6{%
 \begin{pgfonlayer}{courses}%
-\node[draw,dotted,line width=\boldwidth,fill=#6,rounded corners=2pt,inner ysep=0.5pt](x#1y#2) at (#1,#2)%
+\node[draw,dotted,line width=\boldwidth,fill=#6](x#1y#2) at (#1,#2)%
 {
 \renewcommand{\arraystretch}{1.7}%
 \href{\CourseURL{#1}{#2}{#3}}{\begin{tabular}{@{\hspace{1pt}}c@{\hspace{1pt}}}%
@@ -561,12 +382,12 @@
 \def\@mini#1,#2:#3{%
 \begin{pgfonlayer}{courses}%
 \ifgridon
-  \node[fill=white,draw=white,inner ysep=1.8pt](x#1y#2) at (#1,#2)%
+  \node[fill=white,draw=white](x#1y#2) at (#1,#2)%
   {
   \href{\CourseURL{#1}{#2}{#3}}{%
   {\smallersize\mdseries#3}}};%
 \else
-  \node[fill=none,draw=none,inner ysep=1.8pt](x#1y#2) at (#1,#2)%
+  \node[fill=none,draw=none](x#1y#2) at (#1,#2)%
   {
   \href{\CourseURL{#1}{#2}{#3}}{%
   {\smallersize\mdseries#3}}};%
@@ -579,10 +400,10 @@
 % include coordinates if grid on, but don't hyperlink if grid off
 \begin{pgfonlayer}{courses}%
 \ifgridon
-  \node[fill=white,draw=white,inner ysep=1.8pt](x#1y#2) at (#1,#2)%
+  \node[fill=white,draw=white](x#1y#2) at (#1,#2)%
 {\href{coord: #1,#2}{\sffamily\mdseries\renewcommand{\arraystretch}{0.5}\begin{tabular}[b]{@{}c@{}}#3\\[-0.4ex]\end{tabular}}};%
 \else
-  \node[fill=none,draw=none,inner ysep=1.8pt](x#1y#2) at (#1,#2){\sffamily\mdseries\renewcommand{\arraystretch}{0.5}\begin{tabular}[b]{@{}c@{}}#3\\[-0.4ex]\end{tabular}};%
+  \node[fill=none,draw=none](x#1y#2) at (#1,#2){\sffamily\mdseries\renewcommand{\arraystretch}{0.5}\begin{tabular}[b]{@{}c@{}}#3\\[-0.4ex]\end{tabular}};%
 \fi
 \end{pgfonlayer}%
 }
@@ -655,11 +476,10 @@
 \def\@straight#1,#2,#3,#4:{%
   \begin{pgfonlayer}{arrows}
   \draw[draw=white,line width=1.5pt](x#1y#2) -- (x#3y#4) ;
-  \draw[-{Latex[fill=black]},draw=white,very thin](x#1y#2) -- (x#3y#4) ;
   \ifgridon
-    \draw[line width=\solidwidth](x#1y#2) -- node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4);
+    \draw[->,line width=\solidwidth](x#1y#2) -- node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4);
   \else
-    \draw[line width=\solidwidth](x#1y#2) -- (x#3y#4) ;
+    \draw[->,line width=\solidwidth](x#1y#2) -- (x#3y#4) ;
   \fi
   \end{pgfonlayer}
 }
@@ -678,11 +498,10 @@
   \setcounter{@inangle}{180 - \the@myangle}
   \begin{pgfonlayer}{arrows}
   \draw[draw=white,line width=1.5pt](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
-  \draw[-{Latex[fill=black]},draw=white,very thin](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
   \ifgridon
-    \draw[line width=\solidwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
+    \draw[->,line width=\solidwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
   \else
-    \draw[line width=\solidwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
+    \draw[->,line width=\solidwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
   \fi
   \end{pgfonlayer}
 }
@@ -690,11 +509,10 @@
 \def\@straightDashed#1,#2,#3,#4:{%
 \begin{pgfonlayer}{arrows}
 \draw[draw=white,line width=1.5pt] (x#1y#2) -- (x#3y#4);
-\draw[-{Latex[fill=black]},draw=white,very thin] (x#1y#2) -- (x#3y#4);
 \ifgridon
-  \draw[dashed,line width=\dashedwidth] (x#1y#2) -- node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
+  \draw[->,dashed,line width=\dashedwidth] (x#1y#2) -- node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
 \else
-  \draw[dashed,line width=\dashedwidth] (x#1y#2) -- (x#3y#4);
+  \draw[->,dashed,line width=\dashedwidth] (x#1y#2) -- (x#3y#4);
 \fi
 \end{pgfonlayer}
 }
@@ -712,11 +530,10 @@
   \setcounter{@inangle}{180 - \the@myangle}
   \begin{pgfonlayer}{arrows}
   \draw[draw=white,line width=1.5pt](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
-  \draw[-{Latex[fill=black]},draw=white,very thin](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
   \ifgridon
-    \draw[dashed,line width=\dashedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4);
+    \draw[->,dashed,line width=\dashedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4);
   \else
-    \draw[dashed,line width=\dashedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4);
+    \draw[->,dashed,line width=\dashedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4);
   \fi
   \end{pgfonlayer}
 }
@@ -724,11 +541,10 @@
 \def\@straightDotted#1,#2,#3,#4:{%
   \begin{pgfonlayer}{arrows}
   \draw[draw=white,line width=1.5pt] (x#1y#2) -- (x#3y#4);
-  \draw[-{Latex[fill=black]},draw=white,very thin] (x#1y#2) -- (x#3y#4);
   \ifgridon
-    \draw[loosely dotted,line width=\dottedwidth] (x#1y#2) -- node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
+    \draw[->,loosely dotted,line width=\dottedwidth] (x#1y#2) -- node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
   \else
-    \draw[loosely dotted,line width=\dottedwidth] (x#1y#2) -- (x#3y#4);
+    \draw[->,loosely dotted,line width=\dottedwidth] (x#1y#2) -- (x#3y#4);
   \fi
   \end{pgfonlayer}
 }
@@ -746,11 +562,10 @@
   \setcounter{@inangle}{180 - \the@myangle}
   \begin{pgfonlayer}{arrows}
   \draw[draw=white,line width=1.5pt](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
-  \draw[-{Latex[fill=black]},draw=white,very thin](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
   \ifgridon
-    \draw[loosely dotted,line width=\dottedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
+    \draw[->,loosely dotted,line width=\dottedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] node[anchor=mid] {\href{coord: #1,#2,#3,#4}{\textbullet}} (x#3y#4) ;
   \else
-    \draw[loosely dotted,line width=\dottedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
+    \draw[->,loosely dotted,line width=\dottedwidth](x#1y#2) to[out=\the@myangle,in=\the@inangle,relative] (x#3y#4) ;
   \fi
   \end{pgfonlayer}
 }
@@ -794,15 +609,17 @@
 \newenvironment{chart}
 { \setcounter{@diagwidth}{10 + 1 * \ratio{\textwidth}{\unit}}
 
-  \newwrite\@imapfile    % image-map data
-  \newwrite\@scriptfile  % shell script to generate image file
-  \ifthenelse{\value{chart} = 0}
-  { \immediate\openout\@imapfile=\jobname.map
-    \immediate\write\@imapfile{<map name="\jobname">}
-  }
-  { \immediate\openout\@imapfile=\jobname_\thechart.map
-    \immediate\write\@imapfile{<map name="\jobname_\thechart">}
-  }
+  \ifpdf
+    \newwrite\@imapfile    % image-map data
+    \newwrite\@scriptfile  % shell script to generate image file
+    \ifnum\value{chart}=0
+      \immediate\openout\@imapfile=\jobname.map
+      \immediate\write\@imapfile{<map name="\jobname">}
+    \else
+      \immediate\openout\@imapfile=\jobname_\thechart.map
+      \immediate\write\@imapfile{<map name="\jobname_\thechart">}
+    \fi
+   \fi
 
   \let\halfcourse=\@halfcourse
   \let\halfcoursec=\@halfcoursec
@@ -825,8 +642,8 @@
   \let\recomm=\@recomm
   \let\recommc=\@recommc
   \let\grid=\@grid
-  \begin{tikzpicture}[x=\unit,y=\unit]
-  \tikzstyle{every rectangle node}=[inner xsep=1.8pt]
+  \begin{tikzpicture}[x=\unit,y=\unit,>={Latex[length=4pt,fill=black]}]
+  \tikzstyle{every rectangle node}=[inner xsep=1.8pt,rounded corners=2pt,inner ysep=0.5pt]
   \setcounter{@gridwidth}{(\the@diagwidth-5) / 10}
   \setcounter{@gridright}{10 * \value{@gridwidth}}
   \setcounter{@gridheight}{\thediagheight / 10}
@@ -837,34 +654,206 @@
 }
 { 
   \end{tikzpicture}
-  \write\@imapfile{</map>}
-  \closeout\@imapfile
-  \zsavepos{EndOfChart_\thechart}  % determine cropping coordinates
-  \ifdim\paperwidth<\paperheight 
-    % portrait mode
-    \setcounter{xSE}{\dpi * \ratio{\zposx{EndOfChart_\thechart}sp}{1in}}%
-    \setcounter{ySE}{ \dpi * \ratio{\paperheight}{1in}}
-    \addtocounter{ySE}{0 - \dpi * \ratio{\zposy{EndOfChart_\thechart}sp}{1in}}
-    \addtocounter{ySE}{0 + 2 * \PixelsPerUnit }  % bottom margin
-  \else  
-    % landscape mode
-    \setcounter{xSE}{ \dpi * \ratio{\paperwidth}{1in}}
-    \addtocounter{xSE}{0 - \dpi * \ratio{\zposx{EndOfChart_\thechart}sp}{1in}}%
-    \addtocounter{xSE}{0 + 2 * \PixelsPerUnit }  % bottom margin
-    \setcounter{ySE}{ \dpi * \ratio{\paperheight}{1in}}
-    \addtocounter{ySE}{ 0 - \dpi * \ratio{\zposy{EndOfChart_\thechart}sp}{1in}}
+  \ifpdf
+    \write\@imapfile{</map>}
+    \closeout\@imapfile
+    \zsavepos{EndOfChart_\thechart}  % determine cropping coordinates
+    \ifdim\paperwidth<\paperheight 
+      % portrait mode
+      \setcounter{xSE}{\dpi * \ratio{\zposx{EndOfChart_\thechart}sp}{1in}}%
+      \setcounter{ySE}{ \dpi * \ratio{\paperheight}{1in}}
+      \addtocounter{ySE}{0 - \dpi * \ratio{\zposy{EndOfChart_\thechart}sp}{1in}}
+      \addtocounter{ySE}{0 + 2 * \PixelsPerUnit }  % bottom margin
+    \else  
+      % landscape mode
+      \setcounter{xSE}{ \dpi * \ratio{\paperwidth}{1in}}
+      \addtocounter{xSE}{0 - \dpi * \ratio{\zposx{EndOfChart_\thechart}sp}{1in}}%
+      \addtocounter{xSE}{0 + 2 * \PixelsPerUnit }  % bottom margin
+      \setcounter{ySE}{ \dpi * \ratio{\paperheight}{1in}}
+      \addtocounter{ySE}{ 0 - \dpi * \ratio{\zposy{EndOfChart_\thechart}sp}{1in}}
+    \fi
+    \edef\HasH{\expandafter\@gobble\string\#}
+    \ifnum\value{chart}=0
+      % generate a script to crop a chart image
+      \immediate\openout\@scriptfile=\jobname.sh
+      \immediate\write\@scriptfile{\HasH!/bin/sh}
+      %  defer remaining output till cropping coordinates are available
+      \write\@scriptfile{mogrify -crop \thexSE x\theySE +0+0 \jobname.png}
+      \write\@scriptfile{exit 0}
+      \closeout\@scriptfile
+    \fi % more than one chart? unlikely a cropping script would be usable
   \fi
-  \edef\HasH{\expandafter\@gobble\string\#}
-  \ifthenelse{\value{chart} = 0}
-  { % generate a script to crop a chart image
-    \immediate\openout\@scriptfile=\jobname.sh
-    \immediate\write\@scriptfile{\HasH!/bin/sh}
-    %  defer remaining output till cropping coordinates are available
-    \write\@scriptfile{mogrify -crop \thexSE x\theySE +0+0 \jobname.png}
-    \write\@scriptfile{exit 0}
-    \closeout\@scriptfile
-  }
-  { % more than one chart; unlikely a script would be usable
-  }
   \stepcounter{chart}
 }
+%
+% Changelog:
+%
+%  Version 6.4.1
+%
+%    Set length=4pt for arrow tips in tikzpicture options.
+%    Remove dependence on the ifthen package.
+%    Generate map and cropping script only for pdf output.
+%
+%  Version 6.4.0
+%
+%    Revise arrows for tikz version 3.0.0
+%
+%  Version 6.3.6
+%
+%    Allow line breaks in \text boxes.
+%
+%  Version 6.3.5
+%
+%    Fix font usage to work with mweights.sty.
+%
+%  Version 6.3.4
+%
+%    Timetable and course code in bold for required boxes.
+%
+%  Version 6.3.3
+%
+%    Remove background colour from standalone boxes.
+%    \smallersize increased to \relsize{-2}.
+%
+%  Version 6.3.2
+%
+%    Use pgf layers to keep grid below arrows below boxes (thanks to Ryan Kavanagh).
+%    Add struts to stand-alone \...box commands.
+%
+%  Version 6.3
+%
+%    Allow "opt" course boxes (with dotted outlines).
+%
+%  Version 6.2
+%
+%    Allow for multi-line "timetable" arguments by using nested tabular environments.
+%
+%  Version 6.1.0
+%
+%    Added commands to specify background color of non-mini course boxes.
+%
+%  Version 6.0.6
+%
+%    Provide \textbullet at mid-point of edges when grid is on.
+%
+%  Version 6.0.5
+%
+%    Changed TARGET attribute in AREA outputs to "new".
+%    New configuration command \baselineAdj.
+%
+%  Version 6.0.4
+%
+%    Added missing initializations of @dy to curved...  macros.
+%
+%  Version 6.0.3
+%
+%    Added required ALT tag to AREA outputs.
+%
+%  Version 6.0
+%  Version 5.7
+%
+%    added implementation details to documentation
+%    generated script now only crops the chart image
+%
+%  Version 5.6
+%  Version 5.5
+%
+%    version increased to keep pace with previewer/vprerex
+%
+%  Version 5.4
+%
+%    code clean-up
+%
+%  Version 5.3
+%
+%    produces an image-generating script in \jobname.sh
+%
+%  Version 5.2
+%
+%    use \grid and \foreach (tikz) instead of \multido
+%    half-course boxes now have a minimum height (5 units) to improve uniformity
+%
+%  Version 5.1
+%
+%    generates image-map data in \jobname_n.html for nth chart when n>1 
+%
+%  Version 5.0
+%
+%    also generates \jobname.html with image-map data for all node URLs
+%    new configuration commands \dpi and \PixelsPerUnit
+%    default \unit length adjusted to give 10 pixels per coordinate unit at 125 dpi
+%
+%  Version 4.4
+%
+%    increase ysep parameter to 1.8pt to separate course-code or text and arrow tails for minis 
+%    and text boxes
+%
+%  Version 4.3
+%
+%    introduce \smallersize configuration command
+%
+%  Version 4.2
+%
+%    using tinting with xcolor package to ease background-color changes 
+%
+%  Version 4.1
+%
+%  Version 4.0
+%
+%   Implement the \text command to place a line of text (centered at the coordinates) in a chart
+%
+%  Version 3.8.1:
+%
+%   adjust arraystretch factors to work with long-ascender fonts such as Futura
+%   adjust inner sep parameters to work with oblique/italic fonts
+%   remove workaround for pgf-1.10 bug described at
+%      http://sourceforge.net/forum/forum.php?thread_id=1621660&forum_id=477363
+%   require version 1.18 (or later) of pgf
+%
+%  Version 3.8:
+%
+%    require version 1.10 (or later) of pgf
+%
+%  Version 3.7:
+%
+%    anchor nodes must be non-null for latex/dvips
+%
+%  Version 3.6:
+%
+%    first pgf-based version
+%
+%  Version 3.5:
+%  Version 3.4:
+%
+%    introduce arrow borders to improve the appearance of crossing arrows
+%    change default widths to artifacts created when arrow borders 
+%      occlude box boundaries
+%
+%  Version 3.3:
+%
+%    arrows (as well as course boxes and minis) are hyperlinked with coordinate URIs
+%
+%  Version 3.2:
+%
+%  Version 3.1:
+%
+%  Version 3.0:
+%
+%   "anchor" hyperlinks are added to coordinate grid to allow computation of
+%      chart coordinates at mouse clicks 
+%
+%  Version 2.0:
+%
+%    CourseURL now takes 3 arguments
+%    box/mini coordinates displayed in (some) PDF viewers when grid on
+%
+%  Version 1.0.2:
+%
+%    using \relsize{-3} rather than \scriptsize
+%    using \textsf in \lightbox and \boldbox
+%
+%  Version 1.0.1:
+%
+%    using \RequirePackage rather than \usepackage (suggested by Herbert Voss)
+%
+