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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();
    }