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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
** This file is part of the documentation of the Qt Toolkit.
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
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** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file.  Please review the following information
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#include <QtGui>
#include <math.h>

#include "window.h"

Window::Window(QWidget *parent)
    : QWidget(parent)
    text = QString("Support for text rendering and layout in Qt 4 has been "
                   "redesigned around a system that allows textual content to "
                   "be represented in a more flexible way than was possible "
                   "with Qt 3. Qt 4 also provides a more convenient "
                   "programming interface for editing documents. These "
                   "improvements are made available through a reimplementation "
                   "of the existing text rendering engine, and the "
                   "introduction of several new classes. "
                   "See the relevant module overview for a detailed discussion "
                   "of this framework. The following sections provide a brief "
                   "overview of the main concepts behind Scribe.");

    setWindowTitle(tr("Plain Text Layout"));

00060 void Window::paintEvent(QPaintEvent *event)
//! [0]
    QTextLayout textLayout(text, font);
    qreal margin = 10;
    qreal radius = qMin(width()/2.0, height()/2.0) - margin;
    QFontMetrics fm(font);

    qreal lineHeight = fm.height();
    qreal y = 0;


    while (1) {
        // create a new line 
        QTextLine line = textLayout.createLine();
        if (!line.isValid())

        qreal x1 = qMax(0.0, pow(pow(radius,2)-pow(radius-y,2), 0.5));
        qreal x2 = qMax(0.0, pow(pow(radius,2)-pow(radius-(y+lineHeight),2), 0.5));
        qreal x = qMax(x1, x2) + margin;
        qreal lineWidth = (width() - margin) - x;

        line.setPosition(QPointF(x, margin+y));
        y += line.height();


    QPainter painter;
    painter.fillRect(rect(), Qt::white);
    textLayout.draw(&painter, QPoint(0,0));

    painter.drawEllipse(QRectF(-radius, margin, 2*radius, 2*radius));
//! [0]

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