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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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 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 to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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"));
+}
+
+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;
+
+ textLayout.beginLayout();
+
+ while (1) {
+ // create a new line
+ QTextLine line = textLayout.createLine();
+ if (!line.isValid())
+ break;
+
+ 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.setLineWidth(lineWidth);
+ line.setPosition(QPointF(x, margin+y));
+ y += line.height();
+ }
+
+ textLayout.endLayout();
+
+ QPainter painter;
+ painter.begin(this);
+ painter.setRenderHint(QPainter::Antialiasing);
+ painter.fillRect(rect(), Qt::white);
+ painter.setBrush(QBrush(Qt::black));
+ painter.setPen(QPen(Qt::black));
+ textLayout.draw(&painter, QPoint(0,0));
+
+ painter.setBrush(QBrush(QColor("#a6ce39")));
+ painter.setPen(QPen(Qt::black));
+ painter.drawEllipse(QRectF(-radius, margin, 2*radius, 2*radius));
+ painter.end();
+//! [0]
+}