circlewidget.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

/****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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.trolltech.com/products/qt/opensource.html
**
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** review the following information:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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#include <QtGui>

#include "circlewidget.h"

#include <stdlib.h>

CircleWidget::CircleWidget(QWidget *parent)
    : QWidget(parent)
{
    floatBased = false;
    antialiased = false;
    frameNo = 0;

    setBackgroundRole(QPalette::Base);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}

void CircleWidget::setFloatBased(bool floatBased)
{
    this->floatBased = floatBased;
    update();
}

void CircleWidget::setAntialiased(bool antialiased)
{
    this->antialiased = antialiased;
    update();
}

QSize CircleWidget::minimumSizeHint() const
{
    return QSize(50, 50);
}

QSize CircleWidget::sizeHint() const
{
    return QSize(180, 180);
}

void CircleWidget::nextAnimationFrame()
{
    ++frameNo;
    update();
}

void CircleWidget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, antialiased);
    painter.translate(width() / 2, height() / 2);

    for (int diameter = 0; diameter < 256; diameter += 9) {
        int delta = abs((frameNo % 128) - diameter / 2);
        int alpha = 255 - (delta * delta) / 4 - diameter;
        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));
            }
        }
    }
}