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4.1.0.9 context
ConTeXt is a macro package for TeX, highly integrated with Metapost (for drawing figures) and intended for creation of high-quality PDF documents. The terminal outputs Metafun source, which can be edited manually, but you should be able to configure most things from outside.
For an average user of ConTeXt + gnuplot module it’s recommended to refer to ‘Using ConTeXt‘ rather than reading this page or to read the manual of the gnuplot module for ConTeXt.
The ‘context‘ terminal supports the following options:
Syntax:
set term context {default}
{defaultsize | size <scale> | size <xsize>{in|cm}, <ysize>{in|cm}}
{input | standalone}
{timestamp | notimestamp}
{noheader | header "<header>"}
{color | colour | monochrome}
{rounded | mitered | beveled} {round | butt | squared}
{dashed | solid} {dashlength | dl <dl>}
{linewidth | lw <lw>}
{fontscale <fontscale>}
{mppoints | texpoints}
{inlineimages | externalimages}
{defaultfont | font "{<fontname>}{,<fontsize>}"}
In non-standalone (‘input‘) graphic only parameters size to select graphic size, ‘fontscale‘ to scale all the labels for a factor <fontscale> and font size, make sense, the rest is silently ignored and should be configured in the .tex file which inputs the graphic. It’s highly recommended to set the proper fontsize if document font differs from 12pt, so that gnuplot will know how much space to reserve for labels.
‘default‘ resets all the options to their default values.
‘defaultsize‘ sets the plot size to 5in,3in. size <scale> sets the plot size to <scale> times <default value>. If two arguments are given (separated with ’,’), the first one sets the horizontal size and the second one the vertical size. Size may be given without units (in which case it means relative to the default value), with inches (’in’) or centimeters (’cm’).
‘input‘ (default) creates a graphic that can be included into another ConTeXt document. ‘standalone‘ adds some lines, so that the document might be compiled as-is. You might also want to add ‘header‘ in that case.
Use ‘header‘ for any additional settings/definitions/macros that you might want to include in a standalone graphic. ‘noheader‘ is the default.
‘notimestamp‘ prevents printing creation time in comments (if version control is used, one may prefer not to commit new version when only date changes).
‘color‘ to make color plots is the default, but ‘monochrome‘ doesn’t do anything special yet. If you have any good ideas how the behaviour should differ to suit the monochrome printers better, your suggestions are welcome.
‘rounded‘ (default), ‘mitered‘ and ‘beveled‘ control the shape of line joins. ‘round‘ (default), ‘butt‘ and ‘squared‘ control the shape of line caps. See PostScript or PDF Reference Manual for explanation. For wild-behaving functions and thick lines it is better to use ‘rounded‘ and ‘round‘ to prevent sharp corners in line joins. (Some general support for this should be added to Gnuplot, so that the same options could be set for each line (style) separately).
‘dashed‘ (default) uses different dash patterns for different line types, ‘solid‘ draws all plots with solid lines.
‘dashlength‘ or ‘dl‘ scales the length of the dashed-line segments by <dl>. ‘linewidth‘ or ‘lw‘ scales all linewidths by <lw>. (lw 1 stands for 0.5bp, which is the default line width when drawing with Metapost.) ‘fontscale‘ scales text labels for factor <fontscale> relative to default document font.
‘mppoints‘ uses predefined point shapes, drawn in Metapost. ‘texpoints‘ uses easily configurable set of symbols, defined with ConTeXt in the following way:
\\defineconversion[my own points][+,{\\ss x},\\mathematics{\\circ}]
\\setupGNUPLOTterminal[context][points=tex,pointset=my own points]
‘inlineimages‘ writes binary images to a string and only works in ConTeXt MKIV. ‘externalimages‘ writes PNG files to disk and also works with ConTeXt MKII. Gnuplot needs to have support for PNG images built in for this to work.
With ‘font‘ you can set font name and size in standalone graphics. In non-standalone (‘input‘) mode only the font size is important to reserve enough space for text labels. The command
set term context font "myfont,ss,10"
will result in
\\setupbodyfont[myfont,ss,10pt]
If you additionaly set ‘fontscale‘ to 0.8 for example, then the resulting font will be 8pt big and
set label ... font "myfont,12"
will come out as 9.6pt.
It is your own responsibility to provide proper typescripts (and header), otherwise switching the font will have no effect. For a standard font in ConTeXt MKII (pdfTeX) you could use:
set terminal context standalone header '\\usetypescript[iwona][ec]' \\
font "iwona,ss,11"
Please take a look into ConTeXt documentation, wiki or mailing list (archives) for any up-to-date information about font usage.
Examples:
set terminal context size 10cm, 5cm # 10cm, 5cm
set terminal context size 4in, 3in # 4in, 3in
For standalone (whole-page) plots with labels in UTF-8 encoding:
set terminal context standalone header '\\enableregime[utf-8]'
, /* TODO: LaTeX formatting */
— REQUIREMENTS —
You need gnuplot module for ConTeXt http://ctan.org/pkg/context-gnuplot and a recent version of ConTeXt. If you want to call gnuplot on-the-fly, you also need write18 enabled. In most TeX distributions this can be set with shell_escape=t in texmf.cnf.
See http://wiki.contextgarden.net/Gnuplot for details about this terminal and for more exhaustive help & examples.
— CALLING GNUPLOT FROM CONTEXT —
The easiest way to make plots in ConTeXt documents is
\\usemodule[gnuplot]
\\starttext
\\title{How to draw nice plots with {\\sc gnuplot}?}
\\startGNUPLOTscript[sin]
set format y "%.1f"
plot sin(x) t '$\\sin(x)$'
\\stopGNUPLOTscript
\\useGNUPLOTgraphic[sin]
\\stoptext
This will run gnuplot automatically and include the resulting figure in the document."
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