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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QML Presentation System.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 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 the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Digia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/


import QtQuick 2.0
import QtQuick.Particles 2.0

Item {
    anchors.fill: parent

    Rectangle {
        anchors.fill: parent
        gradient: Gradient {
            GradientStop { position: 0; color: "lightsteelblue" }
            GradientStop { position: 1; color: "black" }
        }
    }

    Rectangle {
        id: colorTableItem
        width: 16
        height: 16
        anchors.fill: parent

        property color color1: Qt.rgba(0.8, 0.8, 1, 0.3)
        property color color2: Qt.rgba(0.8, 0.8, 1, 0.3)

        gradient: Gradient {
            GradientStop { position: 0.0; color: "transparent"}
            GradientStop { position: 0.05; color: colorTableItem.color1 }
            GradientStop { position: 0.3; color: "transparent" }
            GradientStop { position: 0.7; color: "transparent" }
            GradientStop { position: 0.95; color: colorTableItem.color2 }
            GradientStop { position: 1.0; color: "transparent" }
        }

        visible: false
    }

    ShaderEffectSource {
        id: colorTableSource
        sourceItem: colorTableItem
        smooth: true
    }

    Repeater {
        model: 4
        Swirl {

            width: parent.width
            anchors.bottom: parent.bottom
            height: parent.height / (2 + index)
            opacity: 0.3
            speed: (index + 1) / 5
            colorTable: colorTableSource
        }
    }

    ParticleSystem{
        id: particles
    }
    ImageParticle{
        anchors.fill: parent
        system: particles
        source: "particle.png"
        alpha: 0
        colorVariation: 0.3
    }

    Emitter{
        anchors.fill: parent
        system: particles
        emitRate: Math.sqrt(parent.width * parent.height) / 30
        lifeSpan: 2000
        size: 4
        sizeVariation: 2

        acceleration: AngleDirection { angle: 90; angleVariation: 360; magnitude: 20; }
        velocity: AngleDirection { angle: -90; angleVariation: 360; magnitude: 10; }
    }

}