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BZ5635 - Document the new <tic> tag.
\label{Authoring_Dynamic_Plot_Tics}
The \textbf{xtics} and \textbf{ytics} tags can be inserted by selecting
the \textbf{Plot tics} item from the insert selection list of the
\textbf{gnuplot} tag.
The \textbf{xtics} and \textbf{ytics} tags have identical structure and the
description presented here applies to both.
The tics tags allow specification of the following attributes:
\begin{itemize}
\item \texttt{Location of major tic marks}
``Border'' or ``Axis''.
Tic marks can be placed on the border or on the axes. The images below
illustrate the effects of each of these options.
\includegraphics[ width=0.40\paperwidth]{Authoring_Dynamic_Plot_Axis_Tics_border}
\includegraphics[ width=0.40\paperwidth]{Authoring_Dynamic_Plot_Axis_Tics_x_axis}
\item \texttt{Mirror tics on opposite axis?}
``Yes'' or ``No''.
If the \textbf{location of tic marks} is set to ``border'' this parameter
determines if they are shown on both the top and bottom or right and left
sides of the graph. The ``mirror'' tic marks are unlabelled.
\includegraphics[ width=0.40\paperwidth]{Authoring_Dynamic_Plot_Axis_Tics_border}
\includegraphics[ width=0.40\paperwidth]{Authoring_Dynamic_Plot_Axis_Tics_nomirror}
\item \texttt{Start major tics at}
The point in graph coordinates which to start making major tics.
This may be less than or greater than the lower limit for the axis.
\item \texttt{Place a major tic every}
The span, in graph coordinates, between each major tic mark.
\item \texttt{Stop major tics at}
This may be less than or greater than the upper limit for the axis.
\item \texttt{Number of minor tics between major tic marks}
The number of subdivisions to make of the span between major tic marks.
Using a value of ``10'' leads to 9 minor tic marks. The example below
uses a value of ``5'' to produce 4 tic marks.
\includegraphics[ width=0.40\paperwidth]{Authoring_Dynamic_Plot_Axis_Tics_minor}
\item \texttt{rotate}
For output devices that support it, the \texttt{rotate=`1'} attribute rotates
the tic label. This is most useful with large lables defined by the
\textbf{tic} tag described below.
\end{itemize}
In addition to specifying regular tic intervals via the attributes of the
\textbf{xtics} and \textbf{ytics} you can specify arbitrary tic locations
by enclosing \textbf{tic} tags within the body of these tags. Each
\textbf{tic} tag requires the \textbf{location} attribute which specifies the
location of a tic on the axis. The body of the tag contains the label of
that tic.
The \textbf{xtic} or \textbf{ytic} \texttt{rotate} attribute can rotate
the label text if the output device supports text rotation.
If \textbf{tic} tags are embedded within the \textbf{xtic} or \textbf{ytic}
tags attributes of those tags that specify tic boundaries and interval are
ignored. Here's an example of an X axis tic specification in months of the year:
\begin{verbatim}
...
<xtics rotate='on'>
<tic location='1'>January</tic>
<tic location='2'>February</tic>
<tic location='3'>March</tic>
<tic location='4'>April</tic>
<tic location='5'>May</tic>
<tic location='6'>June</tic>
<tic location='7'>July</tic>
<tic location='8'>August</tic>
<tic location='9'>September</tic>
<tic location='10'>October</tic>
<tic location='11'>November</tic>
<tic location='12'>December</tic>
</xtics>
<ytics end="6.0" location="border" start="-6.0"
increment="1.0" mirror="on" />
\end{verbatim}
Note that tic locations are completely under your control and do not even have
to be at regular interevals on the axis if that better suits your needs.
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