title: How to draw and fill a triangle with QPainter?
body: <p>This is what I tried, it gave me no output. Where am I going wrong?</p>
  
  <pre><code>      // Start point of bottom line
        qreal startPointX1 = 600.0;
        qreal startPointY1 = 600.0;
  
        // End point of bottom line          
        qreal endPointX1   = 600.0;
        qreal endPointY1   = 1200.0;
  
        // Start point of top line
        qreal startPointX2 = 600.0;
        qreal startPointY2 = 600.0;
  
        // End point of top line          
        qreal endPointX2   = 800.0;
        qreal endPointY2   = 1200.0;
  
  
        QPainterPath path;
        // Set pen to this point.
        path.moveTo (startPointX1, startPointY1);
        // Draw line from pen point to this point.
        path.lineTo (endPointX1, endPointY1);
  
        path.moveTo (endPointX1, endPointY1);
        path.lineTo (endPointX2,   endPointY2);
  
        path.moveTo (endPointX2,   endPointY2);
        path.lineTo (startPointX1, startPointY1);
  
        painter.setPen (Qt :: NoPen);
        painter.fillPath (path, QBrush (QColor ("blue")));
  </code></pre>
  
  <p>I have just tried to create a path between these 3 points and fill the area, but there is no output shown.</p>