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PieChart example using compose
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package com.example.composecharts.ui.widgets | |
import androidx.compose.animation.AnimatedVisibility | |
import androidx.compose.animation.core.AnimationSpec | |
import androidx.compose.animation.core.animateFloatAsState | |
import androidx.compose.animation.core.tween | |
import androidx.compose.animation.fadeIn | |
import androidx.compose.animation.fadeOut | |
import androidx.compose.foundation.background | |
import androidx.compose.foundation.layout.* | |
import androidx.compose.material.Button | |
import androidx.compose.material.MaterialTheme | |
import androidx.compose.material.Text | |
import androidx.compose.runtime.* | |
import androidx.compose.ui.Alignment | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.draw.drawBehind | |
import androidx.compose.ui.geometry.Size | |
import androidx.compose.ui.graphics.Color | |
import androidx.compose.ui.text.font.FontWeight | |
import androidx.compose.ui.tooling.preview.Preview | |
import androidx.compose.ui.unit.dp | |
import androidx.compose.ui.unit.sp | |
import kotlin.math.roundToInt | |
data class PieDataItem( | |
val color: Color, | |
val label: String, | |
val value: Float | |
) | |
@Composable | |
private fun ChartLegend( | |
data: List<PieDataItem>, | |
modifier: Modifier | |
) { | |
val items = data.sortedBy { it.label } | |
Column { | |
Text( | |
text = "LEGEND", | |
style = MaterialTheme.typography.caption.copy( | |
fontSize = 16.sp, | |
fontWeight = FontWeight.Bold | |
) | |
) | |
items.forEach { | |
Row(modifier = Modifier.padding(4.dp)) { | |
Spacer(modifier = modifier.drawBehind { | |
drawRect(it.color, size = Size(40.dp.toPx(), 20.dp.toPx())) | |
}) | |
Text( | |
"${it.label} - ${(it.value * 100f).roundToInt()}%", | |
modifier = Modifier.padding(horizontal = 50.dp) | |
) | |
} | |
} | |
} | |
} | |
@Composable | |
private fun PieChart( | |
items: List<PieDataItem>, | |
animationSpec: AnimationSpec<Float>, | |
isChartVisible: Boolean | |
) { | |
val sortedItems = items.sortedBy { it.value } | |
var startAngle = 0f | |
Box( | |
modifier = Modifier.size(200.dp) | |
) { | |
sortedItems.forEach { dataItem -> | |
val sweepValue = animateFloatAsState( | |
animationSpec = animationSpec, | |
targetValue = if (isChartVisible) dataItem.value * 360f else 0f | |
).value | |
Spacer( | |
modifier = Modifier | |
.size(200.dp) | |
.drawBehind { | |
drawArc( | |
color = dataItem.color, | |
startAngle = startAngle, | |
sweepAngle = sweepValue, | |
useCenter = true, | |
) | |
startAngle += sweepValue | |
} | |
.align(Alignment.Center) | |
) | |
} | |
} | |
} | |
@Composable | |
fun PieChartExample(data: List<PieDataItem>, modifier: Modifier = Modifier) { | |
var isChartVisible by remember { mutableStateOf(false) } | |
Column( | |
modifier = modifier | |
.background(Color.White) | |
.fillMaxSize(), | |
) { | |
Button( | |
onClick = { | |
isChartVisible = isChartVisible.not() | |
} | |
) { | |
val label = if (isChartVisible) "Hide" else "Show" | |
Text("$label Pie Chart") | |
} | |
PieChart( | |
items = data, | |
animationSpec = tween( | |
1200, | |
100 | |
), | |
isChartVisible = isChartVisible | |
) | |
AnimatedVisibility( | |
visible = isChartVisible, | |
enter = fadeIn( | |
animationSpec = tween( | |
durationMillis = 1200, | |
delayMillis = 600 | |
) | |
), | |
exit = fadeOut( | |
animationSpec = tween( | |
durationMillis = 1200, | |
delayMillis = 600 | |
) | |
) | |
) { | |
ChartLegend(data, modifier) | |
} | |
} | |
} | |
@Preview | |
@Composable | |
fun PieChartExamplePreview() { | |
MaterialTheme { | |
PieChartExample( | |
data = listOf( | |
PieDataItem(value = 0.15f,/*15%*/color = Color.Red, label = "Red"), | |
PieDataItem(value = 0.05f, /*5%*/color = Color.Blue, label = "Blue"), | |
PieDataItem(value = 0.3f, /*30%*/color = Color.Green, label = "Green"), | |
PieDataItem(value = 0.25f, /*25%*/color = Color.Magenta, label = "Magenta"), | |
PieDataItem(value = 0.25f, /*25%*/ color = Color.Gray, label = "Gray") | |
) | |
) | |
} | |
} |
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