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<h1>Attributes</h1>

<p>
You may like to give a line or a shape a different look, by
specifying a wider linewidth or a different colour.  Every DoNaLD
variable that can be displayed has an attribute variable (an EDEN
variable) for you to modify its presentation.  Integers, reals, booleans
and chars have no immediate graphical representation, hence no attribute
variables accompany them.  Interestingly enough, openshape does not have
attributes either.  This is because openshape is not a shape but a
collection of shapes.  Its subshapes may each have an attribute but the
openshape itself has not.
</p>

<p>
The attribute variables are EDEN variables, and are named after the
translated name of the DoNaLD variables in EDEN.  The attribute variable
name for the DoNaLD variable <code>Obj/line1</code> would be <code>A_Obj_line1</code>.  Attributes
are of the form:
</p>

<pre>
"attr1=value1,attr2=value2..."
</pre>

<p>
The set of attributes available may vary from one implementation to another.
For tkeden, legal attributes are:
</p>

<dl>
<dt><code>outlinecolor</code></dt>
<dd>applicable to:  any shape
<br>acceptable values:  any X-Windows recognised colour name +
transparent</dd>
<dt><code>color</code></dt>
<dd>applicable to:  closed shapes
<br>acceptable values: any X-Windows recognised colour name +
transparent.  This is the fill colour of the shape.  Note that older
versions of <em>tkeden</em> had no <code>outlinecolor</code> -
<code>color</code> specified both outline and fill colours.</dd>
<dt><code>linewidth</code></dt>
<dd>applicable to:  <code>line</code>, <code>arc</code>, <code>circle</code>, <code>shape</code>
<br>acceptable values:  positive integers, 0 = minimum line width</dd>
<dt><code>linestyle</code></dt>
<dd>applicable to:  <code>line</code>
<br>acceptable values:  <code>dotted</code>, <code>dashed</code>, <code>solid</code></dd>
<dt><code>arrow</code></dt>
<dd>applicable to:  <code>line</code>
<br>acceptable values:  <code>first</code>, <code>last</code>, <code>both</code>, <code>none</code>
followed by 2 spaces)</dd>
<dt><code>locus</code></dt>
<dd>applicable to:  any shape
<br>acceptable values:  <code>true</code>, <code>false</code></dd>
<dt><code>fill</code></dt>
<dd>applicable to:  any shape
<br>acceptable values:  <code>solid</code>, <code>hollow</code></dd>
</dl>

<p>
<em>Notes:</em>
</p>

<ul><li>There must not be any space character in the attribute string.</li>
<li>Attributes will affect all the graphical objects within a shape. 
If the shape is the transformation (rotation, translation or scaling) of
an openshape, the attributes given to the shape will override the
attributes given to the individual shapes within the openshape.</li></ul>

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