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** GNU General Public License Usage
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** General Public License version 3 as published by the Free Software
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import QtQuick 2.0
import QtQuick3D 1.0
import MouseArea3D 1.0

Node {
    id: overlayNode

    property View3D view3D
    property Node target: parent
    property bool autoScale: true
    property Camera camera: view3D.camera

    // Read-only
    property real relativeScale: 1

    onSceneTransformChanged: updateScale()
    onAutoScaleChanged: updateScale()
    // Trigger delayed update on camera change to ensure camera values are correct
    onCameraChanged: _generalHelper.requestOverlayUpdate();

    Connections {
        target: camera
        onSceneTransformChanged: updateScale()
    }

    Connections {
        target: _generalHelper
        onOverlayUpdateNeeded: updateScale()
    }

    function getScale(baseScale)
    {
        return Qt.vector3d(baseScale.x * relativeScale, baseScale.y * relativeScale,
                           baseScale.z * relativeScale);
    }

    function updateScale()
    {
        if (!autoScale) {
            target.scale = Qt.vector3d(1, 1, 1);
        } else {
            relativeScale = helper.getRelativeScale(overlayNode);
        }
    }

    MouseArea3D {
        id: helper
        active: false
        view3D: overlayNode.view3D
    }
}