Touch in QML chartview

Refi

I have created a QML chart with code

     ChartView {
    id: chart
    anchors.fill: parent
    antialiasing: true
    ValueAxis {
        id: axisY
        tickCount: 3
    }
    DateTimeAxis{
           id: xTime
           gridVisible: false
       }
    ToolTip {
        id: id_toolTip
        contentItem: Text{
            color: "#21be2b"
        }
        background: Rectangle {
                border.color: "#21be2b"
            }

    }
    SplineSeries{
        id: chartseries
        pointsVisible: true
        pointLabelsVisible: false
        useOpenGL: true
        axisX: xTime
        axisY: axisY
        onClicked: {
           id_toolTip.text = "dd"
            id_toolTip.visible = true;
         }
    }

}

But tooltip is not showing on all touches . Sometimes it shows . Sometimes it did not. What will be the cause

Diracsbracket

@Refi
That is probably due to the hotspot of the touch not being exactly on the graph sometimes...

One obvious way to improve this is to increase the width of your graph lines, but that may not be too pretty.

Another way is to determine the closest point on your graph using some code computations.

My idiot's solutions is this: superimpose the same series, make its color "transparent" but give it a sufficiently wide line thickness and put the click handler there...

Refi

@Diracsbracket
I think this is a good Idea . Will try this.
Is there any to put tooltips only on graph points after making

pointsVisible : true

Diracsbracket

@Refi
In that case, I suggest making the transparent plot an XY scatter plot instead...