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/****************************************************************************
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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the documentation of the Qt Toolkit.
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****************************************************************************/
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Window::Window(QWidget *parent)
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text = QString("Support for text rendering and layout in Qt 4 has been "
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"redesigned around a system that allows textual content to "
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"be represented in a more flexible way than was possible "
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"with Qt 3. Qt 4 also provides a more convenient "
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"programming interface for editing documents. These "
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"improvements are made available through a reimplementation "
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"of the existing text rendering engine, and the "
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"introduction of several new classes. "
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"See the relevant module overview for a detailed discussion "
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"of this framework. The following sections provide a brief "
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"overview of the main concepts behind Scribe.");
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setWindowTitle(tr("Plain Text Layout"));
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void Window::paintEvent(QPaintEvent *event)
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QTextLayout textLayout(text, font);
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qreal radius = qMin(width()/2.0, height()/2.0) - margin;
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QFontMetrics fm(font);
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qreal lineHeight = fm.height();
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textLayout.beginLayout();
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QTextLine line = textLayout.createLine();
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qreal x1 = qMax(0.0, pow(pow(radius,2)-pow(radius-y,2), 0.5));
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qreal x2 = qMax(0.0, pow(pow(radius,2)-pow(radius-(y+lineHeight),2), 0.5));
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qreal x = qMax(x1, x2) + margin;
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qreal lineWidth = (width() - margin) - x;
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line.setLineWidth(lineWidth);
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line.setPosition(QPointF(x, margin+y));
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textLayout.endLayout();
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painter.setRenderHint(QPainter::Antialiasing);
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painter.fillRect(rect(), Qt::white);
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painter.setBrush(QBrush(Qt::black));
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painter.setPen(QPen(Qt::black));
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textLayout.draw(&painter, QPoint(0,0));
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painter.setBrush(QBrush(QColor("#a6ce39")));
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painter.setPen(QPen(Qt::black));
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painter.drawEllipse(QRectF(-radius, margin, 2*radius, 2*radius));