Qml Coveflow angle animation - qt

Question

I want to implement a coverflow in QML but having a problem with the angle animation.
Scrolling to the left (from number 1→18→17→...) works great, but right scrolling is not behaving as expected. I'm not sure I got the angles right but they seem to animate from -40°→0° which looks odd (correct would be from 40°→0).
Is there a way to correct this behavior?
Here is a working example of my code:
import QtQuick 2.4
import QtQuick.Window 2.2
Window {
visible: true
width: 1280
height: 800
MouseArea {
anchors.fill: parent
onWheel: {
if (wheel.angleDelta.y < 0)
{
view.incrementCurrentIndex()
}
else if (wheel.angleDelta.y > 0)
{
view.decrementCurrentIndex()
}
}
}
PathView {
id: view
property int itemAngle: 40.0
property int itemSize: width/3.5
anchors.fill: parent
pathItemCount: 10
preferredHighlightBegin: 0.5
preferredHighlightEnd: 0.5
interactive: true
model: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]
delegate: viewDelegate
path: Path {
startX: 0
startY: height / 2
PathPercent { value: 0.0 }
PathAttribute { name: "z"; value: 0 }
PathAttribute { name: "angle"; value: view.itemAngle }
PathAttribute { name: "origin"; value: 0 }
PathLine {x: view.width*0.4; y: view.height / 2}
PathPercent { value: 0.45 }
PathAttribute { name: "angle"; value: view.itemAngle }
PathAttribute { name: "origin"; value: 0 }
PathAttribute { name: "z"; value: 10 }
PathLine { relativeX: 0; relativeY: 0 }
PathAttribute { name: "angle"; value: 0.0 }
PathAttribute { name: "origin"; value: 0 }
PathAttribute { name: "z"; value: 10 }
PathLine {x: view.width*0.6; y: view.height / 2}
PathPercent { value: 0.55 }
PathAttribute { name: "angle"; value: 0.0 }
PathAttribute { name: "origin"; value: 0 }
PathAttribute { name: "z"; value: 10 }
PathLine { relativeX: 0; relativeY: 0 }
PathAttribute { name: "angle"; value: -view.itemAngle }
PathAttribute { name: "origin"; value: view.itemSize }
PathAttribute { name: "z"; value: 10 }
PathLine {x: view.width; y: view.height / 2}
PathPercent { value: 1 }
PathAttribute { name: "angle"; value: -view.itemAngle }
PathAttribute { name: "origin"; value: view.itemSize }
PathAttribute { name: "z"; value: 0 }
}
}
Component {
id: viewDelegate
Rectangle {
id: flipItem
width: view.itemSize
height: view.height
color: "white"
z: PathView.z
property var rotationAngle: PathView.angle
property var rotationOrigin: PathView.origin
transform:
Rotation {
id: rot
axis { x: 0; y: 1; z: 0 }
angle: rotationAngle
origin.x: rotationOrigin
origin.y: width
Behavior on angle { PropertyAnimation{} }
}
Rectangle {
border.color: "black"
border.width: 2
color: (index%2 === 0) ? "yellow" : "royalblue"
anchors.top: flipItem.top
anchors.topMargin: 100
anchors.left: flipItem.left
anchors.right: flipItem.right
width: flipItem.width
height: flipItem.height*0.55
smooth: true
antialiasing: true
Text {
text: model.modelData
color: "gray"
font.pixelSize: 30
font.bold: true
anchors.centerIn: parent
}
}
}
}
}