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<head>
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<title>Untangle</title>
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<p><a href="dominosa.html">Previous</a> | <a href="index.html">Contents</a> | <a href="docindex.html">Index</a> | <a href="blackbox.html">Next</a></p>
<h1><a name="C18"></a>Chapter 18: <a name="i0"></a>Untangle</h1>
<p>
You are given a number of points, some of which have lines drawn between them. You can move the points about arbitrarily; your aim is to position the points so that no line crosses another.
</p>
<p>
I originally saw this in the form of a Flash game called <a name="i1"></a>Planarity <a href="#p0">[7]</a>, written by John Tantalo.
</p>
<p><a name="p0"></a>
[7] <a href="http://planarity.net"><code>http://planarity.net</code></a>
</p>
<h2><a name="S18.1"></a>18.1 <a name="i2"></a>Untangle controls</h2>
<p>
To move a point, click on it with the left mouse button and drag it into a new position.
</p>
<p>
(All the actions described in <a href="common.html#S2.1">section 2.1</a> are also available.)
</p>
<h2><a name="S18.2"></a>18.2 <a name="i3"></a>Untangle parameters</h2>
<p>
There is only one parameter available from the ‘Custom...’ option on the ‘Type’ menu:
</p>
<dl><dt>
<em>Number of points</em>
</dt>
<dd>
Controls the size of the puzzle, by specifying the number of points in the generated graph.
</dd>
</dl>
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