I'm trying to make a Swift Chart where 24 AreaMarks an hour apart on X axis over a day display a vertical gradient.
The gradient is vertical and is essentially [Color.opacity(0.1),Colour,Color.opacity(0.1]
The idea here is where the upper and lower points of each AreaMark are the same or close to each other in the Y axis, the chart essentially displays a line, where they are far apart you get a nice fading vertical gradient.
However, it seems that the .alignsMarkStylesWithPlotArea modifier is always set for AreaMarks even if manually applying it false.
Investigating further, I've learnt that with AreaMarks in a series, Swift Charts seems to only listen to the first foreground style set in. I've created some sample code to demonstrate this.
struct DemoChartView: View {
var body: some View {
Chart {
AreaMark(x: .value("Time", Date().addingTimeInterval(0)), yStart: .value("1", 40), yEnd: .value("2", 60))
.foregroundStyle(LinearGradient(colors: [.pink, .teal], startPoint: .top, endPoint: .bottom))
.alignsMarkStylesWithPlotArea(false)
AreaMark(x: .value("Time", Date().addingTimeInterval(3600)), yStart: .value("1", 44), yEnd: .value("2", 58))
.foregroundStyle(LinearGradient(colors: [.orange, .yellow], startPoint: .top, endPoint: .bottom))
.alignsMarkStylesWithPlotArea(false)
AreaMark(x: .value("Time", Date().addingTimeInterval(03600*2)), yStart: .value("1", 50), yEnd: .value("2", 90))
.foregroundStyle(LinearGradient(colors: [.green, .blue], startPoint: .top, endPoint: .bottom))
.alignsMarkStylesWithPlotArea(false)
}
}
}
Which produces this:
So here, all the different .foregroundStyle LinearGradients are being ignored AND the .alignsMarkStylesWithPlotArea(false) is also ignored - the amount of pink on the first mark is different to the second and third 🤷♂️
Has anyone encountered this. Are AreaMarks the correct choice or are they just not setup to create this type of data display. Thanks