"p">,</span> <span class="n">visual_edge</span> <span class="ow">in</span> <span class="n">edge_coord_iter</span><span class="p">:</span>
            <span class="n">src</span><span class="p">,</span> <span class="n">dest</span> <span class="o">=</span> <span class="n">edge</span><span class="o">.</span><span class="n">tuple</span>
            <span class="n">src_vertex</span><span class="p">,</span> <span class="n">dest_vertex</span> <span class="o">=</span> <span class="n">vertex_builder</span><span class