title: Drawing polylines with specific angles in QT
body: <p>is it possible to add a specific angles to polyline in QT?</p>
  
  <p>i draw a polyline with:</p>
  
  <pre><code> QPointF points[3] = {      
       QPointF(x,y),
       QPointF(x2,y2};
       QPointF(x3,y3};
       painter.drawPolyline(points, 3);
  </code></pre>
  
  <p>I need a polyline with an arrow at the end. My Idea was that i copy the last line part, reduce his size and give him an specific angle.</p>