Looking for a way to add lines to a LineProvider after the initial definition

[zell-mbc]

Question

I am creating my line provider like so:

val lineProvider = LineCartesianLayer.LineProvider.series(
    LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[0]))),
    LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[1]))),
    …

And this works fine.
However, in my app what lines are shown is based on user settings and I can't find a way to add lines after the initial definition above.
As a consequence I end up with horrible if's and duplication like the below:

val lineProvider = if (showLinearTrendline)
        if (showBodyFat) LineCartesianLayer.LineProvider.series(
            LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[0]))),
            LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[1]))),
           LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(linearTrendlineColor1)), areaFill = null)
    )
       else LineCartesianLayer.LineProvider.series(
           LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[0]))),
           LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(linearTrendlineColor1)), areaFill = null)
          )
else
    if (showBodyFat) LineCartesianLayer.LineProvider.series(
    …

So my question is, if there is a way for me to initialize the series container with the minimal set of series:

val lineProvider = LineCartesianLayer.LineProvider.series(
    LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[0]))),
    LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[1]))),

and then add new lines as needed, like shown in this artificial example:

if (showBodyFat)
    lineProvider.addLine(LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[3]))))
if (showLinearTrendline)
    lineProvider.addLine(LineCartesianLayer.rememberLine(fill = LineCartesianLayer.LineFill.single(fill(chartColors[4]))))

Vico version(s)

2.0Beta.1

UI framework(s)

Jetpack Compose

[Gowsky]

Hello @zell-mbc. Do you actually need to add Lines to an existing LineProvider (which is possible)? Or are you just looking to fix the duplication issue that you mentioned? If it's the latter, then you can just use something like this:

LineCartesianLayer.LineProvider.series(
    buildList {
        add(LineCartesianLayer.rememberLine(LineCartesianLayer.LineFill.single(fill(chartColors[0]))))
        add(LineCartesianLayer.rememberLine(LineCartesianLayer.LineFill.single(fill(chartColors[1]))))
        if (showBodyFat) {
            add(LineCartesianLayer.rememberLine(LineCartesianLayer.LineFill.single(fill(chartColors[3]))))
        }
        if (showLinearTrendline) {
            add(LineCartesianLayer.rememberLine(LineCartesianLayer.LineFill.single(fill(chartColors[4]))))
        }
    }
)

or a simplified one for this particular case:

LineCartesianLayer.LineProvider.series(
    buildList {
            add(chartColors[0])
            add(chartColors[1])
            if (showBodyFat) add(chartColors[3])
            if (showLinearTrendline) add(chartColors[4])
        }
        .map { rememberLine(LineCartesianLayer.LineFill.single(fill(it))) }
)

[zell-mbc]

Brilliant! Exactly what I needed. Thanks a lot 👍