qtmultimedia/examples/multimedia/audioengine/qml/audioengine.qml

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 ** This file is part of the examples of the Qt Toolkit.
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import QtAudioEngine 1.0
import QtQuick 2.0
import "content"

Rectangle {
    color:"white"
    id: root
    width: 300
    height: 500
    property int radius : 100
    property real twoPi : Math.PI + Math.PI

    MyAudioEngine {
        id:audioEngine
        listener.position : Qt.vector3d(observer.x, observer.y, 0);
    }

    Item {
        id: circle
        x: root.width / 2
        y: root.height / 2
        property real percent: 0
        SequentialAnimation on percent {
            id: circleAnim1
            loops: Animation.Infinite
            running: true
            NumberAnimation {
            duration: 8000
            from: 0
            to: 1
            }

        }
    }

    Item {
        id: holder
        x: circle.x - Math.sin(circle.percent * root.twoPi) * root.radius - 50
        y: circle.y + Math.cos(circle.percent * root.twoPi) * root.radius + 50
    }

    Rectangle {
        color:"green"
        id: observer
        width: 16
        height: 16
        x: circle.x - width / 2
        y: circle.y - height / 2
    }
    Rectangle {
        color:"red"
        id: starship
        width: 32
        height: 32
        x: holder.x - width / 2
        y: holder.y - height / 2
    }
    MouseArea {
       anchors.fill: parent
       onClicked: {
           audioEngine.sounds["effects"].play(Qt.vector3d(holder.x, holder.y, 0));
       }
    }

    SoundInstance {
        id: shipSound
        engine:audioEngine
        sound:"shipengine"
        position: Qt.vector3d(holder.x, holder.y, 0)
        direction: {
            var a = (starship.rotation / 360) * root.twoPi;
            return Qt.vector3d(Math.sin(a), -Math.cos(a), 0);
        }
        velocity: {
            var speed = root.twoPi * root.radius / 4;
            return shipSound.direction * speed;
        }

        Component.onCompleted: shipSound.play()
   }

    //Category Volume Control
    Rectangle {
        property variant volumeCtrl: audioEngine.categories["sfx"];
        id: volumeBar
        x: 10
        y: 10
        width: 280
        height: 22
        color: "darkgray"
        Rectangle {
            id: volumeTracker
            x: 0
            y: 0
            width: volumeBar.volumeCtrl.volume * parent.width;
            height: parent.height
            color: "lightgreen"
        }
        Text {
            text: " volume:" + volumeBar.volumeCtrl.volume * 100 +"%";
            font.pointSize: 16;
            font.italic: true;
            color: "black"
            anchors.fill: parent
        }

        MouseArea {
            anchors.fill: parent
            property bool m:false
            onPressed: {
                m = true;
                updateVolume(mouse);
            }
            onReleased: {
                m = false;
            }

            onPositionChanged: {
                if (m) {
                    updateVolume(mouse);
                }
            }
            function updateVolume(mouse) {
                volumeBar.volumeCtrl.volume = Math.min(1, Math.max(0, mouse.x / (volumeBar.width - 1)));
            }
        }
    }

    //Information display
    Item {
        x:10
        y:32
        Text {
            text: " [live instances] = " + audioEngine.liveInstances;
            font.pointSize: 14;
            font.italic: true;
            color: "black"
            anchors.fill: parent
        }
    }

    Item {
        x:10
        y:60
        Text {
            text: " [loading]=" + (audioEngine.loading ? "true" : "false");
            font.pointSize: 16;
            font.italic: true;
            color: "black"
            anchors.fill: parent
        }
    }
}