Line Chart

LineChart renders single or multi-series line data and morphs to new values when the data changes. LiveLineChart renders a live window that slides as new points arrive.

Line Demo

Basic Usage

The example below is minimal and runs as written. The GIF above uses a longer generated series; its full source is in LineExample.kt.

@Composable
fun ShowLine() {
    val data = listOf(30.0, 45.0, 38.0, 52.0, 61.0, 49.0, 58.0).toChartData(
        categories = listOf("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"),
        seriesName = "Daily Support Tickets",
    )

    LineChart(data = data, title = "Daily Support Tickets")
}

Multi-Series

Pass more than one named series to plot multiple lines on the same chart.

MultiLine Demo

Full source behind the GIF: MultiLineExample.kt.

@Composable
fun ShowMultiLine() {
    val data = listOf(
        "Web Store" to listOf(180.0, 310.0, 420.0, 560.0, 640.0, 720.0),
        "Mobile App" to listOf(120.0, 240.0, 350.0, 430.0, 520.0, 580.0),
        "Partner Sales" to listOf(60.0, 130.0, 190.0, 240.0, 300.0, 340.0),
    ).toChartData(
        categories = listOf("W1", "W2", "W3", "W4", "W5", "W6"),
    )

    LineChart(
        data = data,
        title = "Weekly Revenue by Channel",
        selectedValueFormatter = ChartValueFormatters.prefix("$"),
    )
}

Fixed Y-Axis Range

By default the Y-axis is derived from the data, which can make small fluctuations look exaggerated when the axis doesn't start at zero. Set range on LineChartDefaults.style() to pin min, max, or both, independently of one another; whichever bound you leave null keeps deriving from the data.

Line Range Demo

Full source behind the GIF: LineWithRangeExample.kt.

@Composable
fun ShowLineWithRange() {
    val data = listOf(62.0, 58.0, 65.0, 60.0, 67.0, 59.0, 63.0).toChartData(
        categories = listOf("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"),
        seriesName = "Daily Support Tickets",
    )

    LineChart(
        data = data,
        title = "Daily Support Tickets",
        style = LineChartDefaults.style(
            range = LineChartDefaults.range(min = 40.0, max = 80.0),
        ),
    )
}

Morphing Updates

When data changes, LineChart animates the line from its old shape to the new one. This is the right choice for most charts, including ones with large point counts that support zoom and scroll.

Line Morph Demo

The example below cycles three weeks of the same metric on a timer, with the range pinned so the axis doesn't jump between weeks — see Fixed Y-Axis Range above. Full source behind the GIF: MorphingLineExample.kt.

@Composable
fun ShowMorphingLine() {
    val weeks = listOf(
        listOf(42.0, 38.0, 45.0, 51.0, 47.0, 54.0, 49.0),
        listOf(46.0, 52.0, 68.0, 74.0, 61.0, 50.0, 44.0),
        listOf(58.0, 55.0, 49.0, 43.0, 39.0, 31.0, 28.0),
    )
    var index by remember { mutableIntStateOf(0) }

    LaunchedEffect(Unit) {
        while (true) {
            delay(1400.milliseconds)
            index = (index + 1) % weeks.size
        }
    }

    LineChart(
        data = weeks[index].toChartData(
            categories = listOf("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"),
            seriesName = "Daily Support Tickets",
        ),
        title = "Daily Support Tickets",
        style = LineChartDefaults.style(
            range = LineChartDefaults.range(min = 0.0, max = 80.0),
        ),
        animateOnStart = false,
    )
}

Live Line Chart

LiveLineChart is built for live, continuously updating data. New points slide the whole chart horizontally like a rolling window, and the Y-axis rescales automatically as old values leave the window. The chart is display-only, so it has no selection. shiftDuration sets how long each new point takes to slide into place. Match it to how often data changes.

Live Line Demo

Keep a fixed-size window of values and replace it on every tick. Full source behind the GIF, including its heartbeat-shaped reading generator, is in LiveLineExample.kt.

@Composable
fun ShowLiveLine() {
    var values by remember { mutableStateOf(List(120) { 18.0 }) }

    LaunchedEffect(Unit) {
        while (true) {
            delay(150.milliseconds)
            values = values.drop(1) + nextReading()
        }
    }

    LiveLineChart(
        data = values.toChartData(seriesName = "Live Sensor Reading"),
        title = "Live Sensor Reading",
        shiftDuration = 120.milliseconds,
        animateOnStart = false,
    )
}