- Qt 5.3
- Qt Quick
- Qt Quick Particles Examples - Emitters
- trailemitter.qml Example File
- Qt 5.3.2 Reference Documentation

# trailemitter.qml Example File

particles/emitters/content/trailemitter.qml

    /****************************************************************************
    **
    ** 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."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    import QtQuick 2.0
    import QtQuick.Particles 2.0

    Rectangle {
        id: root
        width: 360
        height: 540
        color: "black"

        ParticleSystem {
            id: particles
            anchors.fill: parent

            ImageParticle {
                id: smoke
                system: particles
                anchors.fill: parent
                groups: ["A", "B"]
                source: "qrc:///particleresources/glowdot.png"
                colorVariation: 0
                color: "#00111111"
            }
            ImageParticle {
                id: flame
                anchors.fill: parent
                system: particles
                groups: ["C", "D"]
                source: "qrc:///particleresources/glowdot.png"
                colorVariation: 0.1
                color: "#00ff400f"
            }

            Emitter {
                id: fire
                system: particles
                group: "C"

                y: parent.height
                width: parent.width

                emitRate: 350
                lifeSpan: 3500

                acceleration: PointDirection { y: -17; xVariation: 3 }
                velocity: PointDirection {xVariation: 3}

                size: 24
                sizeVariation: 8
                endSize: 4
            }

            TrailEmitter {
                id: fireSmoke
                group: "B"
                system: particles
                follow: "C"
                width: root.width
                height: root.height - 68

                emitRatePerParticle: 1
                lifeSpan: 2000

                velocity: PointDirection {y:-17*6; yVariation: -17; xVariation: 3}
                acceleration: PointDirection {xVariation: 3}

                size: 36
                sizeVariation: 8
                endSize: 16
            }

            TrailEmitter {
                id: fireballFlame
                anchors.fill: parent
                system: particles
                group: "D"
                follow: "E"

                emitRatePerParticle: 120
                lifeSpan: 180
                emitWidth: TrailEmitter.ParticleSize
                emitHeight: TrailEmitter.ParticleSize
                emitShape: EllipseShape{}

                size: 16
                sizeVariation: 4
                endSize: 4
            }

            TrailEmitter {
                id: fireballSmoke
                anchors.fill: parent
                system: particles
                group: "A"
                follow: "E"

                emitRatePerParticle: 128
                lifeSpan: 2400
                emitWidth: TrailEmitter.ParticleSize
                emitHeight: TrailEmitter.ParticleSize
                emitShape: EllipseShape{}

                velocity: PointDirection {yVariation: 16; xVariation: 16}
                acceleration: PointDirection {y: -16}

                size: 24
                sizeVariation: 8
                endSize: 8
            }

            Emitter {
                id: balls
                system: particles
                group: "E"

                y: parent.height
                width: parent.width

                emitRate: 2
                lifeSpan: 7000

                velocity: PointDirection {y:-17*4*2; xVariation: 6*6}
                acceleration: PointDirection {y: 17*2; xVariation: 6*6}

                size: 8
                sizeVariation: 4
            }

            Turbulence { //A bit of turbulence makes the smoke look better
                anchors.fill: parent
                groups: ["A","B"]
                strength: 32
                system: particles
            }
        }
    }