Graphic bug

ODБOï

hi,
i just had a strange issue.
i want to make a CircularGauge - like component using Repeater

import QtQuick 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    id: w


    property double centerX :150
    property double centerY : 150
    property int rad : 60


    Slider{
        id: sl
        from: 1
        to : 360
        value: 150
        stepSize: 1
    }


    Repeater{
            id:rp
            anchors.centerIn: parent
            model:sl.value

            Rectangle{
                height: 10
                width: 10
                radius: 5
                color: "blue"

                x : centerX + (centerX + (rad * Math.sin(index * 2 * (Math.PI / 360))) )
                y : centerY + (centerY + (rad * Math.cos(index * 2 * (Math.PI / 360))) )
            }
    }
}

then if i move the sliders handle ..

is there something stupid in my code ? Im sure not, because if i remove the the binding of the repeater

model : sl.value

and change de model manually it works properly

IntruderExcluder

Then custom QQuickPaintedItem? Not sure if having 360 dymically created rectangles is a good idea.

IntruderExcluder

Your code is working fine for me with Qt 5.14 and linux mint. Also wouldn't it be better to use Shape and PathArc?

ODБOï

hi
@IntruderExcluder said in Graphic bug:

Your code is working fine for me with Qt 5.14

Thank you for confirming. My Qt version is 5.13.0 and platform is windows10.

I will need to control every point individually, im not sure i can using Shape and PathArc

IntruderExcluder

Then custom QQuickPaintedItem? Not sure if having 360 dymically created rectangles is a good idea.

ODБOï

@IntruderExcluder said in Graphic bug:

Not sure if having 360 dymically created rectangles is a good idea.

That is may be the issue. Because the same code with less rectangles works correctly.
It looks like the limit is 30... if i bind sliders value to repeaters model

import QtQuick 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    id: w

    property double centerX :150
    property double centerY : 150
    property int rad : 60

    Slider{
        id: sl
        from: 1
        to :30
        stepSize: 1
    }

    Repeater{
            id:rp
            anchors.centerIn: parent
            model:sl.value

            Rectangle{
                height: 10
                width: 10
                radius: 5
                color: "blue"
                x : centerX + (centerX + (rad * Math.sin(index * 2 * (Math.PI / 30))) )
                y : centerY + (centerY + (rad * Math.cos(index * 2 * (Math.PI / 30))) )
            }
    }
}

But if use hardcoded value, i can even put 2000 as model and there is no bug
This tired me, this is first time i observe such stupid behavior in QtQuick

@IntruderExcluder thx for your inputs, i will try with QQuickPaintedItem