n</span><span class="special">()</span>
<span class="special">{</span>
    <span class="comment">// Calculate the intersects of a cartesian polygon</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">d2</span><span class="special">::</span><span class="identifier">point_xy</span><spa