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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "wigglywidget.h"
#include <QFontMetrics>
#include <QPainter>
#include <QTimerEvent>
//! [0]
WigglyWidget::WigglyWidget(QWidget *parent)
: QWidget(parent), step(0)
{
setBackgroundRole(QPalette::Midlight);
setAutoFillBackground(true);
QFont newFont = font();
newFont.setPointSize(newFont.pointSize() + 20);
setFont(newFont);
timer.start(60, this);
}
//! [0]
//! [1]
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
//! [1] //! [2]
{
static constexpr 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]
int offset = 0;
for (char32_t codePoint : text.toUcs4()) {
int index = (step + offset++) % 16;
color.setHsv((15 - index) * 16, 255, 191);
painter.setPen(color);
QString symbol = QString::fromUcs4(&codePoint, 1);
painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400), symbol);
x += metrics.horizontalAdvance(symbol);
}
}
//! [4]
//! [5]
void WigglyWidget::timerEvent(QTimerEvent *event)
//! [5] //! [6]
{
if (event->timerId() == timer.timerId()) {
++step;
update();
} else {
QWidget::timerEvent(event);
}
//! [6]
}
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