is there a way to create a date scale for the x axis?

[shawn-kb]

i am trying to chart the pressure of a transducer over the last week. However the transducer does not report at regular time intervales and I need to chart to reflect that. is there a way to make a date scale on the XAxis that will show these points this way? I have included a version of the chart we use on our web page.

[liuxuan30]

Simple answer: you should generate full date values for xVals, and not insert data entry for those dates that don't have data.
Complicated answer: this has been asked and not having a good solution yet. #194
and you will ask for breaking lines feature, which I already did: #280. #533 is the discussion with a few workarounds.

[shawn-kb]

ok, thanks very much

[romanbaitaliuk]

@skrite @liuxuan30 Hi, do I need to create multiple datasets to implement this feature? (1 for the chart, 2 for the fake xAxis labels) I tried to create 2 data sets and merge them. This is my code:

//primary data set array will include both sets
var primaryDataSet: [LineChartDataSet] = []

//1 data set:
var set1DataEntry: [ChartDataEntry] = [.......]
...
let set1 = LineChartDataSet(values: set1DataEntry, label: nil)

//2 data set
var set2DataEntry: [ChartDataEntry] = [empty]
let set2 = LineChartDataSet(values: set2DataEntry, label: nil)

//merge sets
primaryDataSet.append(set1)
primaryDataSet.append(set2)

//populate chart with data
let lineChartData = LineChartData(dataSets: primaryDataSet)
lineChartView.data = lineChartData

//format labels
lineChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values: [labels for set1 + fake labels])

As a result this code doesn't show fake set2, only set1. Could you please help me with that, what am I doing wrong? I also tried just create 1 set and add more xAxis labels in array, but it didn't solve the problem.

[romanbaitaliuk]

Simple answer: you should generate full date values for xVals, and not insert data entry for those dates that don't have data.

Do I need to append my dataEntries with (0,0) values for those dates that don't have data?

[romanbaitaliuk]

I solved the issue, just created two data sets, and fill second data sets with entries started x value from the last index of 1set.