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#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
protected:
void paintEvent(QPaintEvent *event);
private:
QFont font;
QString text;
};
#endif
#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)
{
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();
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window *window = new Window;
window->resize(337, 343);
window->show();
return app.exec();
}
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