Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

wigglywidget.cpp Example File
widgets/wiggly/wigglywidget.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 3.0 as published by the Free
 ** Software Foundation and appearing in the file LICENSE.GPL included in
 ** the packaging of this file.  Please review the following information
 ** to ensure GNU General Public Licensing requirements will be met:
 ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, as the sole copyright holder for Qt
 ** Designer, grants users of the Qt/Eclipse Integration plug-in the
 ** right for the Qt/Eclipse Integration to link to functionality
 ** provided by Qt Designer and its related libraries.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 #include <QtGui>

 #include "wigglywidget.h"

 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);
 }

 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);
     }
 }