Charts: Line chart fill color goes above/below zeroline

[steve509]

• [x] I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

I've set the fillColor property of an instance of LineChartDataSet.

What did you expect to happen?

I expected the line chart to fill with the specified color.

What happened instead?

The line chart fills with the specific color but it goes above/below the zero line.

See below:

Charts Environment

Charts version/Branch/Commit Number: Charts, 3.0.5
Xcode version: Xcode 9.2
Swift version: Swift 4
Platform(s) running Charts: iOS
macOS version running Xcode: macOS High Seirra 10.13.3

Demo Project

[steve509]

Found a solution to this:

class LineChartFillFormatter: IFillFormatter {
    func getFillLinePosition(dataSet: ILineChartDataSet, dataProvider: LineChartDataProvider) -> CGFloat {
        return 0
    }
}

dataSet.fillFormatter = LineChartFillFormatter()