Kwave::LogoWidget Class Reference

#include <LogoWidget.h>

Inheritance diagram for Kwave::LogoWidget:

Collaboration diagram for Kwave::LogoWidget:

Public Slots
void	doAnim ()

Public Member Functions
	LogoWidget (QWidget *parent)
virtual	~LogoWidget () Q_DECL_OVERRIDE

Protected Member Functions
virtual void	paintEvent (QPaintEvent *) Q_DECL_OVERRIDE

Private Attributes
int	m_width
int	m_height
bool	m_repaint
double	m_deg [MAXSIN]
QImage *	m_image
QPixmap	m_logo
QTimer *	m_timer
double	m_color_h

Detailed Description

Definition at line 35 of file LogoWidget.h.

Constructor & Destructor Documentation

LogoWidget()

Kwave::LogoWidget::LogoWidget ( QWidget *  parent )

explicit

Constructor

Definition at line 39 of file LogoWidget.cpp.

References Kwave::connect(), doAnim(), m_deg, m_timer, and MAXSIN.

    :QWidget(parent), m_width(-1), m_height(-1), m_repaint(false),
     m_image(Q_NULLPTR), m_logo(xpm_aboutlogo), m_timer(Q_NULLPTR),
     m_color_h(0.0)
{
    for (int i = 0; i < MAXSIN; m_deg[i++] = 0) {}

    m_timer = new 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);
}

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~LogoWidget()

Kwave::LogoWidget::~LogoWidget ( )

virtual

Destructor

Definition at line 79 of file LogoWidget.cpp.

References m_image, and m_timer.

{
    if (m_timer) delete m_timer;
    if (m_image) delete m_image;
}

Member Function Documentation

doAnim

void Kwave::LogoWidget::doAnim ( )

slot

animates the next step of the logo

Definition at line 61 of file LogoWidget.cpp.

References m_deg, m_repaint, and MAXSIN.

Referenced by LogoWidget().

{
    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();
}

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paintEvent()

void Kwave::LogoWidget::paintEvent ( QPaintEvent *  )

protectedvirtual

repaints

Definition at line 86 of file LogoWidget.cpp.

References COLOR_INCREMENT, m_color_h, m_deg, m_height, m_image, m_logo, m_repaint, m_width, MAXSIN, rect(), and Kwave::toInt().

{
    // 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 QImage(size(), QImage::Format_ARGB32_Premultiplied);
        m_repaint = true;
    }

    if ((m_repaint) && (m_image)) {
        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, 1.0, 1.0));
        m_color_h += COLOR_INCREMENT; // this gives the nice color change :-)
        if (m_color_h > 1.0) m_color_h -= 1.0;

        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
    if (m_image) {
        QPainter p(this);
        p.drawImage(0, 0, *m_image);
        p.end();
    }

}

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Member Data Documentation

m_color_h

double Kwave::LogoWidget::m_color_h

private

"H" channel of the sine wave color

Definition at line 79 of file LogoWidget.h.

Referenced by paintEvent().

m_deg

double Kwave::LogoWidget::m_deg[MAXSIN]

private

phase of sinus for animation

Definition at line 67 of file LogoWidget.h.

Referenced by doAnim(), LogoWidget(), and paintEvent().

m_height

int Kwave::LogoWidget::m_height

private

height of the widget

Definition at line 61 of file LogoWidget.h.

Referenced by paintEvent().

m_image

QImage* Kwave::LogoWidget::m_image

private

QImage for drawing

Definition at line 70 of file LogoWidget.h.

Referenced by paintEvent(), and ~LogoWidget().

m_logo

QPixmap Kwave::LogoWidget::m_logo

private

image with the logo

Definition at line 73 of file LogoWidget.h.

Referenced by paintEvent().

m_repaint

bool Kwave::LogoWidget::m_repaint

private

set to true for repaint

Definition at line 64 of file LogoWidget.h.

Referenced by doAnim(), and paintEvent().

m_timer

QTimer* Kwave::LogoWidget::m_timer

private

timer for refresh

Definition at line 76 of file LogoWidget.h.

Referenced by LogoWidget(), and ~LogoWidget().

m_width

int Kwave::LogoWidget::m_width

private

width of the widget

Definition at line 58 of file LogoWidget.h.

Referenced by paintEvent().

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The documentation for this class was generated from the following files:

• plugins/about/LogoWidget.h
• plugins/about/LogoWidget.cpp