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#include "wigglywidget.h"
#include <QtWidgets>
//! [0]
WigglyWidget::WigglyWidget(QWidget *parent)
: QWidget(parent)
{
setBackgroundRole(QPalette::Midlight);
setAutoFillBackground(true);
QFont newFont = font();
newFont.setPointSize(newFont.pointSize() + 20);
setFont(newFont);
step = 0;
timer.start(60, this);
}
//! [0]
//! [1]
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
//! [1] //! [2]
{
static const int sineTable[16] = {
0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38
};
QFontMetrics metrics(font());
int x = (width() - metrics.horizontalAdvance(text)) / 2;
int y = (height() + metrics.ascent() - metrics.descent()) / 2;
QColor color;
//! [2]
//! [3]
QPainter painter(this);
//! [3] //! [4]
for (int i = 0; i < text.size(); ++i) {
int index = (step + i) % 16;
color.setHsv((15 - index) * 16, 255, 191);
painter.setPen(color);
painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400),
QString(text[i]));
x += metrics.horizontalAdvance(text[i]);
}
}
//! [4]
//! [5]
void WigglyWidget::timerEvent(QTimerEvent *event)
//! [5] //! [6]
{
if (event->timerId() == timer.timerId()) {
++step;
update();
} else {
QWidget::timerEvent(event);
}
//! [6]
}
#ifndef WIGGLYWIDGET_H
#define WIGGLYWIDGET_H
#include <QBasicTimer>
#include <QWidget>
//! [0]
class WigglyWidget : public QWidget
{
Q_OBJECT
public:
WigglyWidget(QWidget *parent = nullptr);
public slots:
void setText(const QString &newText) { text = newText; }
protected:
void paintEvent(QPaintEvent *event) override;
void timerEvent(QTimerEvent *event) override;
private:
QBasicTimer timer;
QString text;
int step;
};
//! [0]
#endif
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