Crash on one entry point in charts

[amycheong19]

Hi all, I noticed when there is ok one entry point for the chart and it crash with error: (EXC_BAD_INSTRUCTION) at

public override var highestVisibleXIndex: Int
{
    var step = CGFloat(_data.dataSetCount)
    var div = (step <= 1.0) ? 1.0 : step + (_data as! BarChartData).groupSpace

    var pt = CGPoint(x: _viewPortHandler.contentRight, y: _viewPortHandler.contentBottom)
    getTransformer(ChartYAxis.AxisDependency.Left).pixelToValue(&pt)

    ////>>>> crash at this line >>>>>
    return Int((pt.x >= CGFloat(chartXMax)) ? CGFloat(chartXMax) / div : (pt.x / div))
 }

I found out that the point end up display (nan, nan) thus the error. Is there a precaution or workaround for this?

[liuxuan30]

you have to give more information why it is (nan,nan). I met such issues from time to time, and I found it's my fault to feed invalid numbers like nan, like divide 0.

Usually it is your duty to make sure all the data you passed through is valid. If it is a bug, you might need to provde the test data so we can reproduce it. Generally above code seems fine.

[amycheong19]

It only happen when I have one entry point for the graph. Before the line method "getTransformer" my pt. returns (356, 10), after that pt becomes (nan, nan)
I can assure my value pass in are double values combined chart

[liuxuan30]

only one entry point should not be the problem. What's the dataSet code and the view bounds?

[danielgindi]

Please state the version you are using, and show the dataset that crashes.

[danielgindi]

I do not experience any crash with 1 bar. There was a random crash with zero bars which was just fixed.
The last response from @amycheong19 was 23 days ago so I'm assuming he is not experiencing this either.

[mlorenzeCDS]

I have the same crash when the set has all values with the same value (zeros, ones, etc)

[liuxuan30]

@mlorenzeCDS what chart and what data can we reproduce?

[mlorenzeCDS]

I found the solution. The problem was when the dataset has all values equals to zero in Wave Chart.
I had to update the class ChartDataSet.swift (specially the method calcMinMax setting the yMax var with -DBL_MIN)

Thanks!

[liuxuan30]

@danielgindi are you aware of this zero issue?