drawCubicEnabled on LineChartView is missing points when Y Values are missing

[louis49]

With this data you can reproduce the bug :

    var xVals:[String] = ["0", "1", "2", "3", "4", "5", "6"]
    var yVals:[ChartDataEntry] = [
        ChartDataEntry(value: Double(1), xIndex: 1),
        ChartDataEntry(value: Double(5), xIndex: 3),
        ChartDataEntry(value: Double(3), xIndex: 5)
    ]

    var dataSet:LineChartDataSet = LineChartDataSet(yVals: yVals)
    dataSet.drawCirclesEnabled = false
    dataSet.drawFilledEnabled = true
    dataSet.drawCubicEnabled = true

    var data:LineChartData = LineChartData(xVals: xVals, dataSet: dataSet)

[danielgindi]

It looks like there's not enough data to complete a cubic curve. We can of course simulate the last coordinate, and we've done that in the past, so this is a bug introduced lately I guess.
Can you confirm that it works when adding another point?

[louis49]

Yes it works when adding all points

[danielgindi]

I've looked into this - and the problem is the missing y values, which the renderer is not aware of.
@PhilJay do you think that just looping back on the prev point and looping forward on the next point until we have enough points - is enough to solve this? I know that there are some issues on Android with path sizes and a point could be found futher away on the chart and resulting in a bigger path...

[PhilJay]

Yes that could be a solution.
The issue concerning the path only arises if they are significantly larger (in terms of covered pixels) than the screen size.
I think that there still might be some issues in our implementation that cause the "path too big" problem.

[danielgindi]

This was solved in a recent commit, last week.