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widget.cpp Example File
opengl/2dpainting/widget.cpp

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 #include <QtGui>
 #include "widget.h"
 #include "helper.h"

 Widget::Widget(Helper *helper, QWidget *parent)
     : QWidget(parent), helper(helper)
 {
     elapsed = 0;
     setFixedSize(200, 200);
 }

 void Widget::animate()
 {
     elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000;
     repaint();
 }

 void Widget::paintEvent(QPaintEvent *event)
 {
     QPainter painter;
     painter.begin(this);
     painter.setRenderHint(QPainter::Antialiasing);
     helper->paint(&painter, event, elapsed);
     painter.end();
 }