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Demo app: slow renders animation (#627)
* added some basic animation * created an animation of yellow silly comets to create a meteor shower effect after adding the comet book to cart. Added a few ways to make the animation slow render on purpose * comments * idk * cleanup * cleanup * readme update
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...-app/src/main/java/io/opentelemetry/android/demo/shop/ui/components/SlowCometAnimation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| package io.opentelemetry.android.demo.shop.ui.components | ||
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| import androidx.compose.animation.core.* | ||
| import androidx.compose.foundation.Canvas | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.runtime.* | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.tooling.preview.Preview | ||
| import androidx.compose.ui.zIndex | ||
| import kotlinx.coroutines.delay | ||
| import kotlinx.coroutines.launch | ||
| import java.security.SecureRandom | ||
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| @Composable | ||
| fun SlowCometAnimation(modifier: Modifier = Modifier) { | ||
| val cometParams = listOf( | ||
| CometParams(startX = 0f, startY = 0f, targetX = 1.3f, targetY = 1.4f), | ||
| CometParams(startX = 0.2f, startY = 0f, targetX = 1.4f, targetY = 0.9f), | ||
| CometParams(startX = 0.2f, startY = -0.1f, targetX = 1.5f, targetY = 0.8f), | ||
| CometParams(startX = 0f, startY = 0.6f, targetX = 1.2f, targetY = 1.7f), | ||
| CometParams(startX = -0.2f, startY = 0.1f, targetX = 1.4f, targetY = 1.3f), | ||
| CometParams(startX = 0.5f, startY = 0f, targetX = 1.7f, targetY = 1.3f), | ||
| CometParams(startX = 0f, startY = 0f, targetX = 1.3f, targetY = 1.4f), | ||
| CometParams(startX = 0.2f, startY = 0f, targetX = 1.4f, targetY = 1.3f), | ||
| CometParams(startX = 0f, startY = 0f, targetX = 1.4f, targetY = 1.3f), | ||
| CometParams(startX = 0.2f, startY = -0.1f, targetX = 1.5f, targetY = 0.7f), | ||
| CometParams(startX = 0f, startY = 0.6f, targetX = 1.2f, targetY = 1.7f), | ||
| CometParams(startX = -0.2f, startY = 0.1f, targetX = 1.3f, targetY = 1.4f), | ||
| ) | ||
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| val cometVisibility = remember { mutableStateListOf<Boolean>().apply { addAll(List(cometParams.size) { false }) } } | ||
|
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| LaunchedEffect(Unit) { | ||
| cometParams.forEachIndexed { index, _ -> | ||
| launch { | ||
| delay(index * 500L) | ||
| cometVisibility[index] = true | ||
| } | ||
| } | ||
| } | ||
|
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| cometParams.forEachIndexed { index, params -> | ||
| if (cometVisibility[index]) { | ||
| SlowSingleCometAnimation( | ||
| startX = params.startX, | ||
| startY = params.startY, | ||
| targetX = params.targetX, | ||
| targetY = params.targetY, | ||
| modifier = modifier | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
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||
| @Composable | ||
| fun SlowSingleCometAnimation( | ||
| startX: Float, | ||
| startY: Float, | ||
| targetX: Float, | ||
| targetY: Float, | ||
| modifier: Modifier = Modifier | ||
| ) { | ||
| val scope = rememberCoroutineScope() | ||
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| val tailPositions = remember { mutableStateListOf<Offset>() } | ||
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| val animatedX = remember { Animatable(startX) } | ||
| val animatedY = remember { Animatable(startY) } | ||
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| LaunchedEffect(Unit) { | ||
| scope.launch { | ||
| launch { | ||
| delay(500) | ||
| animatedX.animateTo( | ||
| targetValue = targetX, | ||
| animationSpec = tween(durationMillis = 3000, easing = LinearEasing) | ||
| ) | ||
| } | ||
| launch { | ||
| delay(500) | ||
| animatedY.animateTo( | ||
| targetValue = targetY, | ||
| animationSpec = tween(durationMillis = 3000, easing = LinearEasing) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
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||
| LaunchedEffect(animatedX.value, animatedY.value) { | ||
| val currentPosition = Offset(animatedX.value, animatedY.value) | ||
| tailPositions.add(currentPosition) | ||
|
|
||
| if (tailPositions.size > 30) { | ||
| tailPositions.removeAt(0) | ||
| } | ||
| } | ||
|
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| val random = SecureRandom() | ||
| repeat(10_000) { | ||
| random.nextFloat() | ||
| } | ||
|
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| ExpensiveCometShape( | ||
| modifier = modifier, | ||
| headX = animatedX.value, | ||
| headY = animatedY.value, | ||
| tailPositions = tailPositions | ||
| ) | ||
| } | ||
|
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||
| @Composable | ||
| fun ExpensiveCometShape( | ||
| modifier: Modifier = Modifier, | ||
| headX: Float = 0.8f, | ||
| headY: Float = 0.3f, | ||
| tailPositions: List<Offset> = emptyList() | ||
| ) { | ||
| Canvas(modifier = modifier) { | ||
| val headRadius = size.minDimension * 0.05f | ||
| val animatedHeadX = size.width * headX | ||
| val animatedHeadY = size.height * headY | ||
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| for (i in tailPositions.indices) { | ||
| val position = tailPositions[i] | ||
| val posX = size.width * position.x | ||
| val posY = size.height * position.y | ||
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| val progress = i / tailPositions.size.toFloat() | ||
| val tailRadius = headRadius * (1 - progress) | ||
| val tailAlpha = 0.3f * (1 - progress) | ||
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| repeat(100) { | ||
| drawCircle( | ||
| color = Color(0xFFFFD700).copy(alpha = tailAlpha), | ||
| radius = tailRadius, | ||
| center = Offset(posX, posY) | ||
| ) | ||
| } | ||
| } | ||
|
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| repeat(100) { | ||
| drawCircle( | ||
| color = Color(0x80FFFF00), | ||
| radius = headRadius * 2, | ||
| center = Offset(animatedHeadX, animatedHeadY) | ||
| ) | ||
| drawCircle( | ||
| color = Color(0xAAFFA500), | ||
| radius = headRadius * 1.5f, | ||
| center = Offset(animatedHeadX, animatedHeadY) | ||
| ) | ||
| drawCircle( | ||
| color = Color(0xFFFFD700), | ||
| radius = headRadius, | ||
| center = Offset(animatedHeadX, animatedHeadY) | ||
| ) | ||
| drawCircle( | ||
| color = Color.White, | ||
| radius = headRadius * 0.6f, | ||
| center = Offset(animatedHeadX, animatedHeadY) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
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| @Preview(showBackground = true) | ||
| @Composable | ||
| fun PreviewCometAnimation() { | ||
| SlowCometAnimation( | ||
| Modifier | ||
| .fillMaxSize() | ||
| .zIndex(1f) | ||
| ) | ||
| } | ||
|
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||
| data class CometParams( | ||
| val startX: Float, | ||
| val startY: Float, | ||
| val targetX: Float, | ||
| val targetY: Float | ||
| ) |
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