Missile.qml Example File

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import QtQuick 1.0
Item {
    id: missile
    objectName: "missile"
    opacity: 0 // transparent by default
    property int fromYpos
    property int toYpos
    property variant myMissileSize
    property bool enemyMissile: false
    property int defaultX: 0
    property int defaultY: 0
    function storeDefaultPos() {
        defaultX = missile.x
        defaultY = missile.y
    }
    function setToDefaultPos() {
        missile.x = defaultX
        missile.y = defaultY
        opacity = 0.5
    }
    function createGraphicsForLevel() {
        missile.myMissileSize = LevelPlugin.graphSize(LevelPlugin.pathToMissilePic())
        missile.height = myMissileSize.height;
        missile.width = myMissileSize.width;
        if (missile.enemyMissile) {
            missileImage.source = "file:/"+LevelPlugin.pathToEnemyMissilePic()
        } else {
            missileImage.source = "file:/"+LevelPlugin.pathToMissilePic()
        }
    }
    // Execute fire!
    function fire(aXpox, aFromYpos, aToYpos) {
        missile.x = aXpox - missile.width / 2
        missile.y = aFromYpos
        missile.fromYpos = aFromYpos
        missile.toYpos = aToYpos
        missile.opacity = 1
        GameEngine.playSound(2) // NOTE: 3 for your missile sound
        flying.restart()
    }
    // Enemy fires!
    function enemyFire(aXpox, aFromYpos, aToYpos) {
        missile.x = aXpox - missile.width / 2
        missile.y = aFromYpos
        missile.fromYpos = aFromYpos
        missile.toYpos = aToYpos
        missile.opacity = 1
        GameEngine.playSound(3) // NOTE: 3 for enemy missile sound
        flyingEnemy.restart()
    }
    // Stop missile
    function stop() {
        flying.stop()
    }
    // Pause missile
    function pause(doPause) {
        if (doPause) {
            flying.pause()
            flyingEnemy.pause()
        } else {
            flying.resume()
            flyingEnemy.resume()
        }
    }
    Component.onCompleted: {
        if (!enemyMissile) {
            storeDefaultPos()
            setToDefaultPos()
        }
    }
    // Animates missile flying to the target
    SequentialAnimation {
        id: flying
        PropertyAnimation {target: missile; properties: "y";
            from: fromYpos; to: toYpos; duration: 2000; easing.type: Easing.InCubic }
        //PropertyAction {target: missile; properties: "opacity"; value: 0}
        ScriptAction { script: setToDefaultPos() }
    }
    SequentialAnimation {
        id: flyingEnemy
        PropertyAnimation {target: missile; properties: "y";
            from: fromYpos; to: toYpos; duration: 2000; easing.type: Easing.InCubic }
        PropertyAction {target: missile; properties: "opacity"; value: 0}
    }
    Image {
        id: missileImage
        smooth: true
    }
}