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/***************************************************************************
LogoWidget.cpp - widget with the animated Kwave logo
-------------------
begin : Sun Oct 29 2000
copyright : (C) 2000 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "config.h"
#include <math.h>
#include <new>
#include <QBrush>
#include <QColor>
#include <QImage>
#include <QObject>
#include <QPainter>
#include <QPalette>
#include <QPolygon>
#include <QTimer>
#include "libkwave/Utils.h"
#include "LogoWidget.h"
#include "logo.xpm"
/** increment value of the "h" channel of the color of the sine waves */
#define COLOR_INCREMENT (0.001f)
//***************************************************************************
Kwave::LogoWidget::LogoWidget(QWidget *parent)
:QWidget(parent), m_width(-1), m_height(-1), m_repaint(false),
m_image(nullptr), m_logo(xpm_aboutlogo), m_timer(nullptr),
m_color_h(0.0)
{
for (int i = 0; i < MAXSIN; m_deg[i++] = 0) {}
m_timer = new(std::nothrow) QTimer(this);
Q_ASSERT(m_timer);
if (!m_timer) return;
connect(m_timer, SIGNAL(timeout()), this, SLOT(doAnim()));
// gives 40ms refresh ;-)...
m_timer->setInterval(40);
m_timer->start();
QPalette pal = palette();
pal.setColor(QPalette::Window, Qt::black);
setPalette(pal);
}
//***************************************************************************
void Kwave::LogoWidget::doAnim()
{
double mul = 0.04131211 + m_deg[MAXSIN-1] / 75;
for (int i = 0; i < MAXSIN; i++) {
m_deg[i] += mul;
if (m_deg[i] > 2 * M_PI) m_deg[i] = 0;
mul = ((mul * 521)/437);
mul -= floor(mul); // gives again a number between 0 and 1
mul /= 17;
mul += m_deg[i] / 100; //so that chaos may be ...
}
m_repaint = true;
repaint();
}
//***************************************************************************
Kwave::LogoWidget::~LogoWidget()
{
delete m_timer;
delete m_image;
}
//***************************************************************************
void Kwave::LogoWidget::paintEvent(QPaintEvent *)
{
// if image has to be resized ...
if ((rect().height() != m_height) || (rect().width() != m_width)) {
m_height = rect().height();
m_width = rect().width();
if (m_image) delete m_image;
m_image = new(std::nothrow)
QImage(size(), QImage::Format_ARGB32_Premultiplied);
m_repaint = true;
}
if (!m_image) return;
if (m_repaint) {
QPainter p;
QPolygon si(20 + 3);
p.begin(m_image);
// erase everything to black
p.setPen(Qt::black);
p.setBrush(Qt::black);
p.drawRect(0, 0, m_width, m_height);
// blit logo bitmap
int ampx = (m_logo.width() - m_width ) / 2;
int ampy = (m_logo.height() - m_height) / 2;
p.setCompositionMode(QPainter::CompositionMode_Source);
p.drawPixmap(
-ampx + Kwave::toInt(sin(m_deg[0]) * ampx),
-ampy + Kwave::toInt(sin(m_deg[1]) * ampy),
m_logo);
// draw the sine waves with XOR
p.setCompositionMode(QPainter::CompositionMode_Exclusion);
p.setBrush(QColor::fromHsvF(m_color_h, 1.0f, 1.0f));
m_color_h += COLOR_INCREMENT; // this gives the nice color change :-)
if (m_color_h > 1.0f) m_color_h -= 1.0f;
double amp = sin(m_deg[MAXSIN - 1] * 3);
for (int j = 0; j < MAXSIN; j++) {
for (int i = 0; i < 21; i++) {
si.setPoint(i, (j * m_width / MAXSIN) +
Kwave::toInt(amp * sin(M_PI * i / 10 + m_deg[j])
* m_width / 2),
m_height * i / 20);
}
si.setPoint(21, m_width / 2, m_height);
si.setPoint(22, m_width / 2, 0);
p.drawPolygon(si);
amp = sin(m_deg[j] * 3);
}
p.end();
m_repaint = false;
}
// blit the result to the display
QPainter p(this);
p.drawImage(0, 0, *m_image);
p.end();
}
//***************************************************************************
//***************************************************************************
#include "moc_LogoWidget.cpp"
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