n keyword">function</span> <span class="token function">makeHalfAsOpaque</span><span class="token punctuation">(</span><span class="token parameter">ctx</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> Utils<span class="token punctuation">.</span><span class="token function">transparentize</span><span class="token punctuation">(</span><span class="token function">getLineColor</span><span class="token punctuation">(</span>ctx<