How to clear old point using qt charts when end of plot is reached?

[Tom44]

Hi

I am using line series to plot points. when wave reaches at the end of plot
I want to clear the oldest point and plot a new point from the start of the plot.

code:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtCharts 2.0
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    property var i: 0
    property var j: 0
    property var k: 0
    
    ChartView {
        title: "Line"
        anchors.fill: parent
        antialiasing: true
        ValueAxis {
            id: xAxis
            min: 0
            max: 10;
        }
        
        ValueAxis {
            id: yAxis
            min: 0
            max: 10
        }
        
        LineSeries {
            id: lineSer
            name: "LineSeries"
            axisX:  xAxis
            axisY:yAxis
        }
    }
    Timer {
        interval: 500; running: true; repeat: true
        onTriggered: {
            i = i + 0.5
            if(i > 10)
            {
                i = 0
                j = 1
                k=k+1
                
            }
            if(j===1)
            {
                
                lineSer.remove(0)
            }
            
            lineSer.append(i,k)
            
        }
        
    }
}

I am able to clear the point but there is a line drawn from 10.0 to 0.0(digonal) probably due to append. So how can I eliminate this line as it is not needed?