How do I create a Arc Progress bar animation like this
Currently I've already used Canvas to draw an arc and added animations to the progress bar using animateFloatAsState API. But second pic is not my expected.
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// e.g. oldScore = 100f newScore = 350f
// Suppose 250 points are into one level
@Composable
fun ArcProgressbar(
modifier: Modifier = Modifier,
oldScore: Float,
newScore: Float,
level: String,
startAngle: Float = 120f,
limitAngle: Float = 300f,
thickness: Dp = 8.dp
) {
var value by remember { mutableStateOf(oldScore) }
val sweepAngle = animateFloatAsState(
targetValue = (value / 250) * limitAngle, // convert the value to angle
animationSpec = tween(
durationMillis = 1000
)
)
LaunchedEffect(Unit) {
delay(1500)
value = newScore
}
Box(modifier = modifier.fillMaxWidth()) {
Canvas(
modifier = Modifier
.fillMaxWidth(0.45f)
.padding(10.dp)
.aspectRatio(1f)
.align(Alignment.Center),
onDraw = {
// Background Arc
drawArc(
color = Gray100,
startAngle = startAngle,
sweepAngle = limitAngle,
useCenter = false,
style = Stroke(thickness.toPx(), cap = StrokeCap.Square),
size = Size(size.width, size.height)
)
// Foreground Arc
drawArc(
color = Green500,
startAngle = startAngle,
sweepAngle = sweepAngle.value,
useCenter = false,
style = Stroke(thickness.toPx(), cap = StrokeCap.Square),
size = Size(size.width, size.height)
)
}
)
Text(
text = level,
modifier = Modifier
.fillMaxWidth(0.125f)
.align(Alignment.Center)
.offset(y = (-10).dp),
color = Color.White,
fontSize = 82.sp
)
Text(
text = "LEVEL",
modifier = Modifier
.padding(bottom = 8.dp)
.align(Alignment.BottomCenter),
color = Color.White,
fontSize = 20.sp
)
}
}
How can I animate from start again if progress percentage over 100%, just like the one in the gif. Does anybody got some ideas? Thanks!
My first answer doesn't feel like doing any justice since it's far from the gif you posted which shows what you want.
So here's another one that closely resembles it. However, I feel like this implementation is not very efficient in terms of calling sequences of animations, but in terms of
re-composition
I incorporated some optimization strategy called deferred reading, making sure only the composables that observes the values will be the only parts that will be re-composed. I left aLog
statement in the parent progress composable to verify it, theArcProgressbar
is not updating unnecessarily when the progress is animating.Full source code that you can copy-and-paste (preferably on a separate file) without any issues.
Sample usage: