Chartsanimated

Funnel

A conversion funnel of stacked trapezoids that narrow and wipe in top to bottom.

Installation

caveui components are copy-paste Jetpack Compose built entirely on Material 3 — there's no caveui dependency to add. Make sure Material 3 is on your classpath (it ships with the Compose BOM), then copy the Usage snippet below into your project.

kotlin

// build.gradle.kts (module)
dependencies {
    implementation(platform("androidx.compose:compose-bom:2025.06.00"))
    implementation("androidx.compose.material3:material3")
}

Usage

kotlin

@Composable
fun Funnel(
    stages: List<Pair<String, Float>> = listOf(
        "Visits" to 1f, "Signups" to 0.62f,
        "Trials" to 0.4f, "Paid" to 0.22f,
    ),
    accent: Color = Color(0xFF6366F1),
    modifier: Modifier = Modifier,
) {
    val reveal by animateFloatAsState(1f, tween(900, easing = EaseOutCubic), label = "r")
    Canvas(modifier.fillMaxWidth().height(130.dp)) {
        val gap = 6.dp.toPx()
        val rowH = (size.height - gap * (stages.size - 1)) / stages.size
        stages.forEachIndexed { i, (_, w) ->
            val nextW = stages.getOrNull(i + 1)?.second ?: w
            val y = i * (rowH + gap)
            val topHalf = w * size.width / 2 * reveal
            val botHalf = nextW * size.width / 2 * reveal
            val path = Path().apply {
                moveTo(center.x - topHalf, y)
                lineTo(center.x + topHalf, y)
                lineTo(center.x + botHalf, y + rowH)
                lineTo(center.x - botHalf, y + rowH)
                close()
            }
            drawPath(path, accent.copy(alpha = 0.55f + 0.12f * i))
        }
    }
}