/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
**     of its contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "circlewidget.h"

#include <QPainter>

#include <stdlib.h>
#include <QDebug>

//! [0]
CircleWidget::CircleWidget(QWidget *parent)
    : QWidget(parent)
{
    floatBased = false;
    antialiased = false;
    frameNo = 0;

    setBackgroundRole(QPalette::Base);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}
//! [0]

//! [1]
void CircleWidget::setFloatBased(bool floatBased)
{
    this->floatBased = floatBased;
    update();
}
//! [1]

//! [2]
void CircleWidget::setAntialiased(bool antialiased)
{
    this->antialiased = antialiased;
    update();
}
//! [2]

//! [3]
QSize CircleWidget::minimumSizeHint() const
{
    return QSize(50, 50);
}
//! [3]

//! [4]
QSize CircleWidget::sizeHint() const
{
    return QSize(180, 180);
}
//! [4]

//! [5]
void CircleWidget::nextAnimationFrame()
{
    ++frameNo;
    update();
}
//! [5]

//! [6]
void CircleWidget::paintEvent(QPaintEvent *)
{
QTime t;t.start();

    if(buffer.isNull())
    {
        renderingtime = 0;
        nbrendering =0;
#ifdef PIXMAP
        buffer = QPixmap(this->size());
#else
        buffer = QImage(this->size(),QImage::Format_ARGB32_Premultiplied);
#endif
    }

    {
        buffer.fill(Qt::white);
        QPainter painter(&buffer);
        painter.setRenderHint(QPainter::Antialiasing, antialiased);
        painter.translate(width() / 2, height() / 2);
        //! [6]

        //! [7]
        for (int diameter = 0; diameter < 256; diameter += 9) {
            int delta = abs((frameNo % 128) - diameter / 2);
            int alpha = 255 - (delta * delta) / 4 - diameter;
            //! [7] //! [8]
            if (alpha > 0) {
                painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3));

                if (floatBased)
                    painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0, diameter, diameter));
                else
                    painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, diameter, diameter));
            }
        }
    }
    QPainter p(this);
#ifdef PIXMAP
    p.drawPixmap(0,0,buffer);
#else
    p.drawImage(0,0,buffer);
#endif
    renderingtime+= t.elapsed();
    ++nbrendering;

qDebug() << QString("{f = %1,a = %2}").arg(floatBased).arg(antialiased) << renderingtime/nbrendering << " "<< t.elapsed();
}
//! [8]
