title: How to add points in QGraphicsView?
body: <p>I am new to Qt. I have seen the sample codes of adding rectangle, ellipse and line in a QGraphicView. Please help to add a single point in the GraphicsView by giving the x,y coordinate?</p>
  
  <pre><code>QGraphicsScene scene(0,0,800,600); 
  QGraphicsView view(&amp;scene); 
  scene.addText("Hello, world!"); 
  QPen pen(Qt::green); 
  scene.addLine(0,0,200,200,pen); 
  scene.addEllipse(400,300,100,100,pen); 
  view.show(); 
  </code></pre>