- Qt 5.3
- Qt Quick
- Qt Quick Particles Examples - Affectors
- gravity.qml Example File
- Qt 5.3.2 Reference Documentation

# gravity.qml Example File

particles/affectors/content/gravity.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
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    **   * Redistributions of source code must retain the above copyright
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    **     of its 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

    Item {
        id: window
        width: 320; height: 480
        Rectangle {
            id: sky
            anchors.fill: parent
            gradient: Gradient {
                GradientStop {
                    position: 0.0
                    color: "DeepSkyBlue"
                }
                GradientStop {
                    position: 1.0
                    color: "SkyBlue"
                }
            }
        }

        Rectangle {
            id: ground
            width: parent.height * 2
            height: parent.height
            y: parent.height/2
            x: parent.width/2 - parent.height
            transformOrigin: Item.Top
            rotation: 0
            gradient: Gradient {
                GradientStop { position: 0.0; color: "ForestGreen"; }
                GradientStop { position: 1.0; color: "DarkGreen"; }
            }
        }

        MouseArea {
            anchors.fill: parent
            onPositionChanged: {
                var rot = Math.atan2(mouseY - window.height/2,mouseX - window.width/2) * 180/Math.PI;
                ground.rotation = rot;
            }
        }

        ParticleSystem { id: sys }
        Gravity {
            system: sys
            magnitude: 32
            angle: ground.rotation + 90
        }
        Emitter {
            system: sys
            anchors.centerIn: parent
            emitRate: 1
            lifeSpan: 10000
            size: 64
        }
        ImageParticle {
            anchors.fill: parent
            system: sys
            source: "../../images/realLeaf1.png"
        }

    }