pan><span class="p">;</span>
    <span class="nx">pos</span><span class="p">.</span><span class="nx">y</span> <span class="o">=</span> <span class="nx">e</span><span class="p">.</span><span class="nx">clientY</span><span class="p">;</span>
  <span class="p">}</span>

  <span class="kd">function</span> <span class="nx">draw</span><span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>

    <span class="k">if</span> <span class="p">(</span><span class="nx">e</span><s