Why QML Animation does not support setDirection like QAbstractAnimation

[stuf]

I want an object, need it to fellow a complex path and move as an animation. The path is included line and curve. just like a train.

Two solution: 1. PathAnimation or 2. states with multi-animation

Problem of solution 1: The train maybe stop at a random time-point(pause the animation), and go reverse back to the start position(play animation reversely like QAbstractAnimation ), or continue to the end point.

So i want know any way to play PathAnimation reversely?

[A Former User]

Hi! If you need more control over the animation, you can use PathInterpolator:

main.qml

import QtQuick 2.7
import QtQuick.Controls 2.0

ApplicationWindow {
    visible: true
    width: 400
    height: 450
    title: "Fun with paths"
    color: "darkgrey"

    PathInterpolator {
        id: motionPath
        path: Path {
            PathCubic {
                x: 350
                y: 350
                control1X: 350
                control1Y: 0
                control2X: 0
                control2Y: 350
            }
        }
        progress: slider.position
    }

    Rectangle {
        width: 50
        height: 50
        color: "orange"
        border.width: 3
        border.color: "black"
        x: motionPath.x
        y: motionPath.y
        rotation: motionPath.angle
        antialiasing: true
        Text {
            anchors.centerIn: parent
            text: Math.round(motionPath.progress*100) + " %"
        }
    }

    Slider {
        id: slider
        anchors.bottom: parent.bottom
        width: parent.width
    }
}