# ColumnCartesianLayer

Use [`ColumnCartesianLayer`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.layer/-column-cartesian-layer/) to create column charts. Columns are drawn via [`LineComponent`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.common.component/-line-component/) instances provided by [`ColumnCartesianLayer.ColumnProvider`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.layer/-column-cartesian-layer/-column-provider/). [`ColumnCartesianLayer.ColumnProvider.series`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.layer/-column-cartesian-layer/-column-provider/-companion/series) creates a `ColumnCartesianLayer.ColumnProvider` instance that uses one `LineComponent` instance per series. You can create your own implementation for custom behavior, including styling columns individually based on their *y*-values.

On a `ColumnCartesianLayer` instance, you can also change column spacing. Data labels are supported. When multiple series are added, columns can be grouped horizontally or stacked.

## Creation

To create a `ColumnCartesianLayer` instance, use the XML attributes:

```xml
<style name="ChartStyle">
    <item name="layers">column</item>
    <!-- ... -->
</style>
```

```xml
<com.patrykandpatrick.vico.views.cartesian.CartesianChartView
    app:chartStyle="@style/ChartStyle"
    <!-- ... --> />
```

Alternatively, instantiate `ColumnCartesianLayer` via the constructor:

```kt
cartesianChartView.chart = CartesianChart(ColumnCartesianLayer(/* ... */), /* ... */)
```

## `Transaction.columnSeries`

Column layers use [`ColumnCartesianLayerModel`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.data/-column-cartesian-layer-model/) instances. When using [`CartesianChartModelProducer`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.data/-cartesian-chart-model-producer/), add them via [`columnSeries`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.data/column-series):

```kt
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`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.data/-column-cartesian-layer-model/-builder-scope/series) invocation adds a series to the `ColumnCartesianLayerModel` instance. 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

## Manual `ColumnCartesianLayerModel` creation

When creating a [`CartesianChartModel`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.data/-cartesian-chart-model/) instance directly, you can add a column-layer model by using [`build`](https://api.vico.patrykandpatrick.com/vico/views/com.patrykandpatrick.vico.views.cartesian.data/-column-cartesian-layer-model/-companion/build). This function gives you access to the same DSL that `columnSeries` does.

```kt
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))
    },
    // ...
)
```

## Sample charts

* [“Basic column chart”](https://github.com/patrykandpatrick/vico/blob/stable/sample/charts/views/src/main/kotlin/com/patrykandpatrick/vico/sample/charts/views/BasicColumnChart.kt)
* [“Basic combo chart”](https://github.com/patrykandpatrick/vico/blob/stable/sample/charts/views/src/main/kotlin/com/patrykandpatrick/vico/sample/charts/views/BasicComboChart.kt)
* [“Daily digital-media use (USA)”](https://github.com/patrykandpatrick/vico/blob/stable/sample/charts/views/src/main/kotlin/com/patrykandpatrick/vico/sample/charts/views/DailyDigitalMediaUse.kt)
* [“Temperature anomalies (June)”](https://github.com/patrykandpatrick/vico/blob/stable/sample/charts/views/src/main/kotlin/com/patrykandpatrick/vico/sample/charts/views/TemperatureAnomalies.kt)
* [“Rock–metal ratios”](https://github.com/patrykandpatrick/vico/blob/stable/sample/charts/views/src/main/kotlin/com/patrykandpatrick/vico/sample/charts/views/RockMetalRatios.kt)


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