Hi.

I used this example as a template: http://doc.trolltech.com/4.5/widgets-analogclock.html

What is the correct way to repaint clock if I want to repaint hand when button is pressed? If I use paintEvent() function to initialize clock and other function to repaint hand it doesn't work because painter is not active when button is pressed.

Should I even reimplement paintEvent() function?

I tried something like this but how do I paint this to the widget?

Qt Code: 
  1. void Clock::init()
  2. {
  3.     static const QPoint hand[3] = {
  4.         QPoint(7, 8),
  5.         QPoint(-7, 8),
  6.         QPoint(0, -90)
  7.     };
  8.  
  9.     QColor handColor(204, 0, 0);
  10.     QColor lineColor(0, 0, 0);
  11.  
  12.     int side = qMin(width(), height());
  13.  
  14.     QPainter painter(this);
  15.     painter.setRenderHint(QPainter::Antialiasing);
  16.     painter.translate(width() / 2, height() / 2);
  17.     painter.scale(side / 200.0, side / 200.0);
  18.     painter.setPen(Qt::NoPen);
  19.     painter.setBrush(handColor);
  20.     painter.save();
  21.  
  22.  
  23.     painter.rotate(0.0);
  24.     painter.drawConvexPolygon(hand, 3);
  25.     painter.restore();
  26.  
  27.     painter.setPen(lineColor);
  28.     for (int i=0; i < 12; ++i) {
  29.         painter.drawLine(88, 0, 96, 0);
  30.         painter.rotate(30.0);
  31.     }
  32. }
  33.  
  34. void Clock::btnPressed(qreal angle)
  35. {
  36.     static const QPoint hand[3] = {
  37.         QPoint(7, 8),
  38.         QPoint(-7, 8),
  39.         QPoint(0, -40)
  40.     };
  41.  
  42.     QColor handColor(204, 0 ,0);
  43.  
  44.     int side = qMin(width(), height());
  45.  
  46.     QPainter painter(this);
  47.     painter.setRenderHint(QPainter::Antialiasing);
  48.     painter.translate(width() / 2, height() / 2);
  49.     painter.scale(side / 200.0, side / 200.0);
  50.     painter.setPen(Qt::NoPen);
  51.     painter.setBrush(handColor);
  52.     painter.save();
  53.  
  54.     painter.rotate(angle);
  55.     painter.drawConvexPolygon(hand, 3);
  56.     painter.restore();
  57. }
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