wigglywidget.cpp Example File
widgets/wiggly/wigglywidget.cpp
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** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
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** This file is part of the documentation of the Qt Toolkit.
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** accordance with the Qt Preview License Agreement provided with the
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#include <QtGui>
#include "wigglywidget.h"
WigglyWidget::WigglyWidget(QWidget *parent)
: QWidget(parent)
{
setBackgroundRole(QPalette::Midlight);
QFont newFont = font();
newFont.setPointSize(newFont.pointSize() + 20);
setFont(newFont);
step = 0;
timer.start(60, this);
}
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
{
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.width(text)) / 2;
int y = (height() + metrics.ascent() - metrics.descent()) / 2;
QColor color;
QPainter painter(this);
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.width(text[i]);
}
}
void WigglyWidget::timerEvent(QTimerEvent *event)
{
if (event->timerId() == timer.timerId()) {
++step;
update();
} else {
QWidget::timerEvent(event);
}
}