2.5. ColumnCartesianLayer

2.5.1. Overview

ColumnCartesianLayers (column charts) display data as vertical bars, each of which corresponds to a LineComponent. The LineComponents are provided by a ColumnCartesianLayer.ColumnProvider. ColumnCartesianLayer.ColumnProvider.series creates a ColumnCartesianLayer.ColumnProvider that uses one LineComponent per series. You can create your own implementation for custom behavior, including styling columns individually based on their y values.

In addition to customizing the columns, at the ColumnCartesianLayer level, you can change their spacing. Data labels are supported. When multiple series are added, a ColumnCartesianLayer’s columns can be grouped horizontally or stacked.

For more, see 5.3.2 (Compose) and 8.3.2 (views).

2.5.2. Transaction.columnSeries

ColumnCartesianLayers use ColumnCartesianLayerModels. When using a CartesianChartModelProducer, add ColumnCartesianLayerModels via columnSeries:

cartesianChartModelProducer.runTransaction {
    columnSeries {
        series(1, 8, 3, 7)
        series(y = listOf(6, 1, 9, 3))
        series(x = listOf(1, 2, 3, 4), y = listOf(2, 5, 3, 4))
    }
    // ...
}

Each series invocation adds a series to the ColumnCartesianLayerModel. Above, three series are added. series has three overloads (each of which accepts all Number subtypes):

• a vararg overload that takes y values and uses their indices as the x values
• an overload that takes a Collection of y values and uses their indices as the x values
• an overload that takes a Collection of x values and a Collection of y values of the same size

2.5.3. Manual ColumnCartesianLayerModel creation

When creating a CartesianChartModel directly, you can add a ColumnCartesianLayerModel by using build. This function gives you access to the same DSL that columnSeries does.

CartesianChartModel(
    ColumnCartesianLayerModel.build {
        series(1, 8, 3, 7)
        series(y = listOf(6, 1, 9, 3))
        series(x = listOf(1, 2, 3, 4), y = listOf(2, 5, 3, 4))
    },
    // ...
)