; <span class="comment">// format (minx, maxx, miny, maxy) -&gt; integer valued box [40,80]x[20,30]</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">// assume below that `im` is a tgx::Image&lt;tgx::RGB32&gt; object</span></div>
<div class="line"><span class="comment">// method `Image::drawCircle(iVec2 center, int r, color_t color, float opacity)` takes integer value parameters. </span></div>
<div class="line">im.drawCircle(v1, 12, tgx::RGB32_Red); <span class="comment">// draw