ult value when the parameter is omited.</li>
<li><code>opacity = 0.0f</code>: fully transparent drawing (so this draws nothing).</li>
</ul>
<p >Example: </p><div class="fragment"><div class="line"><span class="comment">// assume below that `im` is a tgx::Image&lt;tgx::RGB565&gt; object</span></div>
<div class="line"><span class="comment">// the method Image::drawLine has signature  drawLine(iVec2 P1, iVec2 P2, color_t color, float opacity). </span></div>
<div class="line"> </div>
<div class="line">im.drawLi