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<h4><a name="shading-translucent">8.4.3 <code>translucent</code></a></h4>
<p>Paints markers in a transparent version of their
selected colour.
The degree of transparency is determined by how many points
are plotted on top of each other and by the transparency
level.
Unlike <a href="shading-transparent.html">transparent</a> mode,
the transparency varies according to the average
point density in the plot,
so leaving the setting the same as you zoom in and out
usually has a sensible effect.
</p>
<p>
<strong>Usage:</strong>
<pre>
shadingN=translucent colorN=<rrggbb>|red|blue|... translevelN=<number>
</pre>
</p>
<p>All the parameters listed here
affect only the relevant layer,
identified by the suffix
<code>N</code>.
</p>
<p>
<strong>Example:</strong>
</p>
<div align="center"><img src="plot2-shading-translucent.png" alt="" align="middle"></div>
<p><pre> stilts plot2plane layer1=mark in1=dr5qso.fits
<strong>shading1=translucent</strong>
x1=psfmag_g-psfmag_r y1=psfmag_u-psfmag_g size1=2
xmin=-0.5 xmax=2.5 ymin=-1 ymax=6</pre></p>
<p>Associated parameters are as follows:
<dl>
<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>translevelN = <number></code> <em>(Double)</em></strong></dt>
<dd>Sets the level of automatically controlled transparency.
The higher this value the more transparent points are.
Exactly how transparent points are depends on how many
are currently being plotted on top of each other and
the value of this parameter.
The idea is that you can set it to some fixed value,
and then get something which looks similarly
transparent while you zoom in and out.
<p>[Default: <code>0.1</code>]
</p>
</dd>
</dl>
</p>
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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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