Straight Line in third quadrant does't show up

[ArduinoManager]

What did you do?

Simple LineChart with negative x and y values.

`

        let ds1 = LineChartDataSet(values: [], label: "I [mA]")
        ds1.mode = .linear
        ds1.drawCirclesEnabled = true
        ds1.drawCircleHoleEnabled = false
        ds1.circleRadius = 2
        ds1.setCircleColor(.black)
        ds1.colors = [NSUIColor.red]
        ds1.append(ChartDataEntry(x: 0, y: 0))
        ds1.append(ChartDataEntry(x: -50, y: -50))
        ds1.append(ChartDataEntry(x: -100, y: -100))

        chartData.addDataSet(ds1)
        self.lineChartView.data = chartData            
        self.lineChartView.gridBackgroundColor = NSUIColor.white`

What did you expect to happen?

A straight line in the third quadrant

What happened instead?

Nothing. The chart is empty.

Replacing:

ds1.append(ChartDataEntry(x: 0, y: 0))
ds1.append(ChartDataEntry(x: -50, y: -50))
ds1.append(ChartDataEntry(x: -100, y: -100))

with:

ds1.append(ChartDataEntry(x: 0, y: 0))
ds1.append(ChartDataEntry(x: 50, y: 50))
ds1.append(ChartDataEntry(x: 100, y: 100))

a straight line shows up in the first quadrant, as expected.

Charts Environment

Charts version/Branch/Commit Number: Pod 3.2.2
Xcode version: 10.1
Swift version: 4.2
Platform(s) running Charts: macOS 10.14.3
macOS version running Xcode: macOS 10.14.3

Demo Project

NA

[liuxuan30]

seems the order of your x values matters. use -100,-50,0