[Kool]

Hi all,

I’ve noticed something off with MovementAnimations. There seems to be a pause or ‘jitter’ as the position of the player changes. I’ve created a simple example that demonstrates this:

import Felgo 3.0
import QtQuick 2.0

GameWindow {
    id: gameWindow
    activeScene: scene

    screenWidth: 960
    screenHeight: 640

    EntityManager {
        id: entityManager
        entityContainer: scene
    }

    Scene {
        id: scene

        width: 480
        height: 320

        Rectangle {
            id: background
            anchors.fill: parent
            color: "black"
        }

        StyledButton {
            id: startButtonn
            text: "Restart"
            anchors {top: parent.top; right: parent.right}
            onClicked: player.x = parent.width
        }

        Item {
            id: player
            height: 100
            width: 10
            x: parent.width
            y: parent.height / 2

            Rectangle {
                id: shape
                anchors.fill: parent
                color: "white"
                radius: 5
            }

            MovementAnimation {
              id: movement
              target: player
              property: "x"
              velocity:  -75
              running: true
            }
        }
    }
}

Press the button to restart and view it again. I’ve looked at the QML profiler and nothing seems out of the ordinary. Any clues on what’s causing this? Is there an alternative to achieve the desired effect, or a way to mitigate against the visible pauses? The actual object I noticed this with only needs to move on the x axis at a constant velocity.

Cheers!

[Kool]

There does seem to be something going on from the QML stack trace.

There are periods at constant intervals when the framerate drops to 15FPS.

[AlexFelgo Team]

Hi Kool,

this is definitely caused by the internals of the MovementAnimation, looks like there is a frame dropped in consistent intervals when rendering the moved item, thank you for raising our attention on this. However this only seems to happen on Windows Desktop, we’ll have a look at it.

Regards,
Alex