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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();
     }