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<pre><span class="ruby-comment cmt"># File lib/libttc.rb, line 94</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">spokes</span>, <span class="ruby-identifier">spoke_length</span>, <span class="ruby-identifier">arc_length</span>)
<span class="ruby-comment cmt"># A hash of all positions, indexed by position names</span>
<span class="ruby-ivar">@positions</span> = <span class="ruby-constant">Hash</span>.<span class="ruby-identifier">new</span>
<span class="ruby-ivar">@centre</span> = <span class="ruby-constant">Position</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value str">'ac'</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">spoke_length</span>.<span class="ruby-identifier">to_s</span>, <span class="ruby-keyword kw">false</span>, <span class="ruby-keyword kw">false</span>)
<span class="ruby-ivar">@positions</span>[<span class="ruby-value str">'ac'</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">spoke_length</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-identifier">centre</span>
<span class="ruby-identifier">a1_corner</span> = <span class="ruby-keyword kw">nil</span>
<span class="ruby-identifier">end_of_previous_arc</span> = <span class="ruby-keyword kw">nil</span>
<span class="ruby-comment cmt"># Do each arc-spoke-base set</span>
(<span class="ruby-value">?a</span><span class="ruby-operator">...</span>(<span class="ruby-value">?a</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">spokes</span>)).<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">arc_code</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">arc</span> = <span class="ruby-identifier">arc_code</span>.<span class="ruby-identifier">chr</span>
<span class="ruby-identifier">base</span> = <span class="ruby-constant">Position</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">arc</span>, <span class="ruby-keyword kw">false</span>, <span class="ruby-keyword kw">true</span>)
<span class="ruby-identifier">this_arc</span> = <span class="ruby-constant">Array</span>.<span class="ruby-identifier">new</span>
<span class="ruby-comment cmt"># build the arc</span>
(<span class="ruby-value">1</span><span class="ruby-operator">..</span><span class="ruby-identifier">arc_length</span>).<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">arc_position</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">position_name</span> = <span class="ruby-identifier">arc</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">arc_position</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-identifier">arc_place</span> = <span class="ruby-constant">Position</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">position_name</span>, <span class="ruby-identifier">arc_position</span> <span class="ruby-operator">==</span> <span class="ruby-value">4</span>, <span class="ruby-keyword kw">false</span>)
<span class="ruby-identifier">arc_place</span>.<span class="ruby-identifier">neighbours</span> = []
<span class="ruby-ivar">@positions</span>[<span class="ruby-identifier">position_name</span>] = <span class="ruby-identifier">arc_place</span>
<span class="ruby-identifier">this_arc</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">arc_place</span>
<span class="ruby-identifier">a1_corner</span> = <span class="ruby-identifier">a1_corner</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">arc_place</span>
<span class="ruby-keyword kw">end</span>
(<span class="ruby-value">0</span><span class="ruby-operator">...</span><span class="ruby-identifier">arc_length</span>).<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">arc_position</span><span class="ruby-operator">|</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">arc_position</span> <span class="ruby-operator">></span> <span class="ruby-value">0</span>
<span class="ruby-identifier">this_arc</span>[<span class="ruby-identifier">arc_position</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_arc</span>[<span class="ruby-identifier">arc_position</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>]
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">arc_position</span> <span class="ruby-operator"><</span> (<span class="ruby-identifier">arc_length</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>)
<span class="ruby-identifier">this_arc</span>[<span class="ruby-identifier">arc_position</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_arc</span>[<span class="ruby-identifier">arc_position</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>]
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># build the spoke</span>
<span class="ruby-identifier">this_spoke</span> = <span class="ruby-constant">Array</span>.<span class="ruby-identifier">new</span>
(<span class="ruby-value">1</span><span class="ruby-operator">..</span>(<span class="ruby-identifier">spoke_length</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>)).<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">spoke_position</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">position_name</span> = <span class="ruby-identifier">arc</span> <span class="ruby-operator">+</span> <span class="ruby-value str">"c"</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">spoke_position</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-identifier">spoke_place</span> = <span class="ruby-constant">Position</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">position_name</span>, <span class="ruby-identifier">spoke_position</span> <span class="ruby-operator">==</span> <span class="ruby-value">3</span>, <span class="ruby-keyword kw">false</span>)
<span class="ruby-identifier">spoke_place</span>.<span class="ruby-identifier">neighbours</span> = []
<span class="ruby-ivar">@positions</span>[<span class="ruby-identifier">position_name</span>] = <span class="ruby-identifier">spoke_place</span>
<span class="ruby-identifier">this_spoke</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">spoke_place</span>
<span class="ruby-keyword kw">end</span>
(<span class="ruby-value">0</span><span class="ruby-operator">...</span>(<span class="ruby-identifier">spoke_length</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>)).<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">spoke_position</span><span class="ruby-operator">|</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">spoke_position</span> <span class="ruby-operator">></span> <span class="ruby-value">0</span>
<span class="ruby-identifier">this_spoke</span>[<span class="ruby-identifier">spoke_position</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_spoke</span>[<span class="ruby-identifier">spoke_position</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>]
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">spoke_position</span> <span class="ruby-operator"><</span> <span class="ruby-identifier">spoke_length</span> <span class="ruby-operator">-</span> <span class="ruby-value">2</span>
<span class="ruby-identifier">this_spoke</span>[<span class="ruby-identifier">spoke_position</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_spoke</span>[<span class="ruby-identifier">spoke_position</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>]
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># tie the spoke and arc together, </span>
<span class="ruby-identifier">this_arc</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_spoke</span>[<span class="ruby-value">0</span>]
<span class="ruby-identifier">this_spoke</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_arc</span>[<span class="ruby-value">0</span>]
<span class="ruby-comment cmt"># tie the spoke to the centre, and</span>
<span class="ruby-identifier">this_spoke</span>[<span class="ruby-value">-1</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-ivar">@centre</span>
<span class="ruby-ivar">@centre</span>.<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_spoke</span>[<span class="ruby-value">-1</span>]
<span class="ruby-comment cmt"># tie the base to the arc</span>
<span class="ruby-identifier">base</span> = <span class="ruby-constant">Position</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">arc</span>, <span class="ruby-keyword kw">false</span>, <span class="ruby-keyword kw">true</span>)
<span class="ruby-ivar">@positions</span>[<span class="ruby-identifier">arc</span>] = <span class="ruby-identifier">base</span>
<span class="ruby-identifier">base</span>.<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_arc</span>[<span class="ruby-value">0</span>]
<span class="ruby-identifier">this_arc</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">base</span>
<span class="ruby-comment cmt"># record the ends of the arc for tying to adjacent arcs</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">end_of_previous_arc</span>
<span class="ruby-identifier">end_of_previous_arc</span>.<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">this_arc</span>[<span class="ruby-value">0</span>]
<span class="ruby-identifier">this_arc</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">end_of_previous_arc</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">end_of_previous_arc</span> = <span class="ruby-identifier">this_arc</span>[<span class="ruby-value">-1</span>]
<span class="ruby-keyword kw">end</span> <span class="ruby-comment cmt"># arc</span>
<span class="ruby-comment cmt"># tie both ends of the rim together </span>
<span class="ruby-identifier">a1_corner</span>.<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">end_of_previous_arc</span>
<span class="ruby-identifier">end_of_previous_arc</span>.<span class="ruby-identifier">neighbours</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">a1_corner</span>
<span class="ruby-identifier">cache_valid_moves</span>
<span class="ruby-keyword kw">end</span></pre>
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