- Qt 5.5
- Qt Quick
- Qt Quick Particles Examples - Emitters
- trailemitter.qml Example File
- Qt 5.5.1 Reference Documentation

# trailemitter.qml Example File

particles/emitters/content/trailemitter.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** 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:
    **
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    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
            }
        }
    }