Question: optional axis rendering?

[NachoSoto]

Is there a way to render a chart with just one axis? I see ChartCoordsSpaceLeftBottomSingleAxis, ChartCoordsSpaceLeftTopSingleAxis, ChartCoordsSpaceRightBottomSingleAxis, and ChartCoordsSpaceRightTopSingleAxis, but no version with no vertical axis.

It looks like ChartBarsLayer requires both axis. Would it be possible to make them optional?

[ivnsch]

You always need the axis, to define the coordinate space, but you can simply not pass it to the chart layers. Then it will not be displayed:

let chart = Chart(
    frame: chartFrame,
    layers: [
        coordsSpace.xAxis,
//        coordsSpace.yAxis,
    ]
)

To remove the reserved space you have to set related spacing settings to 0 and don't pass any text to the axis. In detail:

Set labelsToAxisSpacingY, spacingBetweenAxesY, labelsSpacing and axisTitleLabelsToLabelsSpacing to 0. (Just noticed that the later should be specific to each axis, or at least not be used when you don't pass a title / in fact all these settings should be conditional - right now this affects also the other axes, though it looks ok. You also can change the value of leading to compensate for this).

Don't pass an axis title:
let yModel = ChartAxisModel(axisValues: yValues, axisTitleLabels: [])

Finally, use axis labels that don't display text (otherwise the max label width will be reserved). For this you can use this custom class:

class ChartAxisValueInvisible: ChartAxisValue {
    override var labels: [ChartAxisLabel] {
        return []
    }
}

Since you are not displaying the axis values you only have to pass the first and last value.