- Qt 5.5
- Qt Quick
- Qt Quick Particles Examples - Affectors
- attractor.qml Example File
- Qt 5.5.1 Reference Documentation

# attractor.qml Example File

particles/affectors/content/attractor.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:
    **
    ** "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 The Qt Company Ltd 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"
        Image {
            source: "../../images/finalfrontier.png"
            anchors.centerIn:parent
        }
        ParticleSystem {
            id: particles
            anchors.fill: parent

            Emitter {
                group: "stars"
                emitRate: 40
                lifeSpan: 4000
                enabled: true
                size: 30
                sizeVariation: 10
                velocity: PointDirection { x: 220; xVariation: 40 }
                height: parent.height
            }
            Emitter {
                group: "roids"
                emitRate: 10
                lifeSpan: 4000
                enabled: true
                size: 30
                sizeVariation: 10
                velocity: PointDirection { x: 220; xVariation: 40 }
                height: parent.height
            }
            ImageParticle {
                id: stars
                groups: ["stars"]
                source: "qrc:///particleresources/star.png"
                color: "white"
                colorVariation: 0.1
                alpha: 0
            }
            ImageParticle {
                id: roids
                groups: ["roids"]
                sprites: Sprite {
                    id: spinState
                    name: "spinning"
                    source: "../../images/meteor.png"
                    frameCount: 35
                    frameDuration: 60
                }
            }
            ImageParticle {
                id: shot
                groups: ["shot"]
                source: "qrc:///particleresources/star.png"

                color: "#0FF06600"
                colorVariation: 0.3
            }
            ImageParticle {
                id: engine
                groups: ["engine"]
                source: "qrc:///particleresources/fuzzydot.png"

                color: "orange"
                SequentialAnimation on color {
                    loops: Animation.Infinite
                    ColorAnimation {
                        from: "red"
                        to: "cyan"
                        duration: 1000
                    }
                    ColorAnimation {
                        from: "cyan"
                        to: "red"
                        duration: 1000
                    }
                }

                colorVariation: 0.2
            }
            Attractor {
                id: gs; pointX: root.width/2; pointY: root.height/2; strength: 4000000;
                affectedParameter: Attractor.Acceleration
                proportionalToDistance: Attractor.InverseQuadratic
            }
            Age {
                x: gs.pointX - 8;
                y: gs.pointY - 8;
                width: 16
                height: 16
            }
            Rectangle {
                color: "black"
                width: 8
                height: 8
                radius: 4
                x: gs.pointX - 4
                y: gs.pointY - 4
            }

            Image {
                source:"../../images/rocket2.png"
                id: ship
                width: 45
                height: 22
                //Automatic movement
                SequentialAnimation on x {
                    loops: -1
                    NumberAnimation{to: root.width-45; easing.type: Easing.InOutQuad; duration: 2000}
                    NumberAnimation{to: 0; easing.type: Easing.OutInQuad; duration: 6000}
                }
                SequentialAnimation on y {
                    loops: -1
                    NumberAnimation{to: root.height-22; easing.type: Easing.OutInQuad; duration: 6000}
                    NumberAnimation{to: 0; easing.type: Easing.InOutQuad; duration: 2000}
                }
            }
            Emitter {
                group: "engine"
                emitRate: 200
                lifeSpan: 1000
                size: 10
                endSize: 4
                sizeVariation: 4
                velocity: PointDirection { x: -128; xVariation: 32 }
                height: ship.height
                y: ship.y
                x: ship.x
                width: 20
            }
            Emitter {
                group: "shot"
                emitRate: 32
                lifeSpan: 1000
                enabled: true
                size: 40
                velocity: PointDirection { x: 256; }
                x: ship.x + ship.width
                y: ship.y + ship.height/2
            }
        }
    }