title: Qt draw lines without fill but edge lines
body: <p>I am trying to draw wide lines like(50 pixel wide) on screen with transparent filling and solid colored edge lines.</p>
  
  <p>Transparent fill with solid edge lines</p>
  
  <p><img src="https://i.stack.imgur.com/ACtP9.png" alt=""></p>
  
  <p>Any suggestions on how to implement this in Qt?</p>