title: How to draw half of pie in QGraphicsItem
body: <p>I'm trying to draw half of pie like this in qGraphicsview framework.<img src="https://i.stack.imgur.com/4XMKr.jpg" alt="enter image description here">  </p>
  
  <p>And I tried to draw  two pie and the color of one of them is transparent but it didn't work and i decided to ask  here.</p>
  
  <p>Because I dont know QPainterPath very well, I was  unsuccessful to draw  arc and pie!.</p>
  
  <p>Any answer oridea will be appreciated.</p>