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<h4><a name="layer-label">8.3.12 <code>label</code></a></h4>
<p>Draws a text label at each position.
You can select the font,
where the labels appear in relation to the point positions, and
how crowded the points have to get before they are suppressed.
</p>
<p>
<strong>Usage Overview:</strong>
<pre>
layerN=label texttypeN=plain|antialias|latex fontsizeN=<int-value>
fontstyleN=standard|serif|mono
fontweightN=plain|bold|italic|bold_italic
anchorN=west|east|north|south colorN=<rrggbb>|red|blue|...
spacingN=<pixels> crowdlimitN=<n> <pos-coord-paramsN>
labelN=<expr> inN=<table> ifmtN=<in-format> istreamN=true|false
icmdN=<cmds>
</pre>
</p>
<p>All the parameters listed here
affect only the relevant layer,
identified by the suffix
<code>N</code>.
</p>
<p>
<dl>
<dt><strong>Positional Coordinate Parameters:</strong></dt>
<dd>The positional coordinates
<code><pos-coord-paramsN></code>
give a position for each row of the input table.
Their form depends on the plot geometry,
i.e. which plotting command is used.
For a plane plot (<a href="plot2plane.html"><code>plot2plane</code></a>)
the parameters would be
<code>xN</code> and <code>yN</code>.
The coordinate parameter values are in all cases strings
interpreted as numeric expressions based on column names.
These can be column names, fixed values or algebraic
expressions as described in <a href="jel.html">Section 10</a>.
</dd>
</dl>
</p>
<p>
<strong>Example:</strong>
</p>
<div align="center"><img src="plot2-layer-label.png" alt="" align="middle"></div>
<p><pre> stilts plot2sky <strong>in=messier.xml</strong> <strong>lon=RA</strong> <strong>lat=DEC</strong> layer1=mark <strong>layer2=label</strong> <strong>label2=NAME</strong></pre></p>
<p>
<dl>
<dt><strong><code>anchorN = west|east|north|south</code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/plot2/Anchor.html">Anchor</a>)</em></strong></dt>
<dd>Determines where the text appears
in relation to the plotted points.
Values are points of the compass.
<p>The available options are:
<ul>
<li><code>west</code></li>
<li><code>east</code></li>
<li><code>north</code></li>
<li><code>south</code></li>
</ul>
</p>
<p>[Default: <code>west</code>]
</p>
</dd>
<dt><strong><code>colorN = <rrggbb>|red|blue|...</code> <em>(<a href="http://docs.oracle.com/javase/6/docs/api/java/awt/Color.html">Color</a>)</em></strong></dt>
<dd>The color of plotted data,
given by name or as a hexadecimal RGB value.
<p>The standard plotting colour names are
<code>red</code>, <code>blue</code>, <code>green</code>, <code>grey</code>, <code>magenta</code>, <code>cyan</code>, <code>orange</code>, <code>pink</code>, <code>yellow</code>, <code>black</code>, <code>light_grey</code>, <code>white</code>.
However, many other common colour names (too many to list here)
are also understood.
The list currently contains those colour names understood
by most web browsers,
from <code>AliceBlue</code> to <code>YellowGreen</code>,
listed e.g. in the
<em>Extended color keywords</em> section of
the <a href="http://www.w3c.org/TR/css3-color#svg-color">CSS3</a> standard.
</p>
<p>Alternatively, a six-digit hexadecimal number <em>RRGGBB</em>
may be supplied,
optionally prefixed by "<code>#</code>" or "<code>0x</code>",
giving red, green and blue intensities,
e.g. "<code>ff00ff</code>", "<code>#ff00ff</code>"
or "<code>0xff00ff</code>" for magenta.
</p>
<p>[Default: <code>red</code>]
</p>
</dd>
<dt><strong><code>crowdlimitN = <n></code> <em>(Integer)</em></strong></dt>
<dd>Sets the maximum number of labels in a label group.
This many labels can appear closely spaced without being
affected by the label spacing parameter.
<p>It is useful for instance if you are looking at
pairs of points, which will always be close together;
if you set this value to 2, an isolated pair of labels
can be seen, but if it's 1 then they will only be plotted
when they are distant from each other,
which may only happen at very high magnifications.
</p>
<p>[Default: <code>2</code>]
</p>
</dd>
<dt><strong><code>fontsizeN = <int-value></code> <em>(Integer)</em></strong></dt>
<dd>Size of the text font in points.
<p>[Default: <code>12</code>]
</p>
</dd>
<dt><strong><code>fontstyleN = standard|serif|mono</code> <em>(FontType)</em></strong></dt>
<dd>Font style for text.
<p>The available options are:
<ul>
<li><code>standard</code></li>
<li><code>serif</code></li>
<li><code>mono</code></li>
</ul>
</p>
<p>[Default: <code>standard</code>]
</p>
</dd>
<dt><strong><code>fontweightN = plain|bold|italic|bold_italic</code> <em>(FontWeight)</em></strong></dt>
<dd>Font weight for text.
<p>The available options are:
<ul>
<li><code>plain</code></li>
<li><code>bold</code></li>
<li><code>italic</code></li>
<li><code>bold_italic</code></li>
</ul>
</p>
<p>[Default: <code>plain</code>]
</p>
</dd>
<dt><strong><code>icmdN = <cmds></code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/filter/ProcessingStep.html">ProcessingStep[]</a>)</em></strong></dt>
<dd>Specifies processing to be performed on
the layer N input table as specified by parameter <code>inN</code>.
The value of this parameter is one or more of the filter
commands described in <a href="filterSteps.html">Section 6.1</a>.
If more than one is given, they must be separated by
semicolon characters (";").
This parameter can be repeated multiple times on the same
command line to build up a list of processing steps.
The sequence of commands given in this way
defines the processing pipeline which is performed on the table.
<p>Commands may alteratively be supplied in an external file,
by using the indirection character '@'.
Thus a value of "<code>@filename</code>"
causes the file <code>filename</code> to be read for a list
of filter commands to execute. The commands in the file
may be separated by newline characters and/or semicolons.
</p>
</dd>
<dt><strong><code>ifmtN = <in-format></code> <em>(String)</em></strong></dt>
<dd>Specifies the format of the input table as specified by parameter <code>inN</code>.
The known formats are listed in <a href="inFormats.html">Section 5.2.1</a>.
This flag can be used if you know what format your
table is in.
If it has the special value
<code>(auto)</code> (the default),
then an attempt will be
made to detect the format of the table automatically.
This cannot always be done correctly however, in which case
the program will exit with an error explaining which
formats were attempted.
<p>[Default: <code>(auto)</code>]
</p>
</dd>
<dt><strong><code>inN = <table></code> <em>(<a href="http://www.starlink.ac.uk/stil/javadocs/uk/ac/starlink/table/StarTable.html">StarTable</a>)</em></strong></dt>
<dd>The location of the input table.
This may take one of the following forms:
<ul>
<li>A filename.</li>
<li>A URL.</li>
<li>The special value "<code>-</code>",
meaning standard input.
In this case the input format must be given explicitly
using the <code>ifmtN</code>
parameter.
Note that not all formats can be streamed in this way.
</li>
<li>A system command line with
either a "<code><</code>" character at the start,
or a "<code>|</code>" character at the end
("<code><syscmd</code>" or
"<code>syscmd|</code>").
This executes the given pipeline and reads from its
standard output.
This will probably only work on unix-like systems.
</li>
</ul>
In any case, compressed data in one of the supported compression
formats (gzip, Unix compress or bzip2) will be decompressed
transparently.
</dd>
<dt><strong><code>istreamN = true|false</code> <em>(Boolean)</em></strong></dt>
<dd>If set true, the input table
specified by the <code>inN</code> parameter
will be read as a stream.
It is necessary to give the
<code>ifmtN</code> parameter
in this case.
Depending on the required operations and processing mode,
this may cause the read to fail (sometimes it is necessary
to read the table more than once).
It is not normally necessary to set this flag;
in most cases the data will be streamed automatically
if that is the best thing to do.
However it can sometimes result in less resource usage when
processing large files in certain formats (such as VOTable).
<p>[Default: <code>false</code>]
</p>
</dd>
<dt><strong><code>labelN = <expr></code> <em>(String)</em></strong></dt>
<dd>Column or expression giving the text of the label
to be written near the position being labelled.
Label values may be of any type (string or numeric)
<p>The value is a <code>Object</code> algebraic expression based on column names
as described in <a href="jel.html">Section 10</a>.
</p>
</dd>
<dt><strong><code>spacingN = <pixels></code> <em>(Integer)</em></strong></dt>
<dd>Determines the closest that labels can be spaced.
If a group of labels is closer to another group
than the value of this parameter,
they will not be drawn, to avoid the display becoming
too cluttered.
The effect is that you can see individual labels
when you zoom in, but not when there are many labelled points
plotted close together on the screen.
Set the value higher for less cluttered labelling.
<p>[Default: <code>12</code>]
</p>
</dd>
<dt><strong><code>texttypeN = plain|antialias|latex</code> <em>(TextSyntax)</em></strong></dt>
<dd>Determines how to turn label text into characters
on the plot.
<code>Plain</code> and
<code>Antialias</code>
both take the text at face value,
but <code>Antialias</code>
smooths the characters.
<code>LaTeX</code>
interprets the text as LaTeX source code
and typesets it accordingly.
<p>When not using LaTeX, antialiased text usually looks nicer,
but can be perceptibly slower to plot.
At time of writing, on MacOS antialiased text
seems to be required to stop the writing coming out
upside-down for non-horizontal text (MacOS java bug).
</p>
<p>[Default: <code>plain</code>]
</p>
</dd>
</dl>
</p>
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<b>Up: </b><a href="LayerType.html">Layer Types</a><br>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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