Charts: Marker Position

[diogoAntunes]

I've implemented a custom MarkerView, but every time the delegate function is called:

func chartValueSelected(_ chartView: ChartViewBase, entry: ChartDataEntry, highlight: Highlight) {
        let position = chartView.getMarkerPosition(highlight: highlight)
}

The value of the position is always (0.0, 0.0). But the marker is being designed:

[liuxuan30]

    open func getMarkerPosition(highlight: Highlight) -> CGPoint
    {
        return CGPoint(x: highlight.drawX, y: highlight.drawY)
    }

Would you please debug highlight.drawX and drawY, to see what's the problem? I tried in ChartsDemo, it's fine.

[Rnorback]

so the way to get the markerPosition now seems to be by getting the hightlight.xPx and highlight.xPy. However, these values are given within the bounds of the chartView.

[Neral]

Yes, it seems that highlight.drawX and drawY always returns values (0.0, 0.0).

As mentioned @Rnorback you could use highlight.xPx & highlight.yPx. Marker position could be converted to any view like this:

let rectInTableView = chartView.convert(CGRect(x: highlight.xPx, y: highlight.yPx, width: 0, height: 0), to: tableView)

[liuxuan30]

I guess you may have to debug why highlight.drawX is 0.0. In charts demo, I am seeing valid values.

[jndefosse]

Tested on ChartDemo with LineChart1ViewController.

Breakpoint at

• (void)chartValueSelected:(ChartViewBase * __nonnull)chartView entry:(ChartDataEntry * __nonnull)entry highlight:(ChartHighlight * __nonnull)highlight

Result :

[liuxuan30]

@jndefosse It's an old issue; are you breaking at the beginning?

            let x = high.x // get the x-position
            let y = high.y * Double(animator.phaseY)

            if x > chartXMax * animator.phaseX
            {
                continue
            }

            let trans = dataProvider.getTransformer(forAxis: set.axisDependency)

            let pt = trans.pixelForValues(x: x, y: y)

There is chance that x, y is 0 when chart just starts. You are welcome to debug, as I don't know the real issue. No update for quite a while, and Chart marker seems working all the time.