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import androidx.compose.animation.core.Spring | |
import androidx.compose.animation.core.animateFloatAsState | |
import androidx.compose.animation.core.animateOffsetAsState | |
import androidx.compose.animation.core.spring | |
import androidx.compose.foundation.Image | |
import androidx.compose.foundation.background | |
import androidx.compose.foundation.layout.Box | |
import androidx.compose.foundation.layout.Column | |
import androidx.compose.foundation.layout.Row | |
import androidx.compose.foundation.layout.fillMaxHeight | |
import androidx.compose.foundation.layout.fillMaxSize | |
import androidx.compose.foundation.layout.offset | |
import androidx.compose.material.icons.Icons | |
import androidx.compose.material.icons.rounded.ArrowBack | |
import androidx.compose.runtime.Composable | |
import androidx.compose.runtime.LaunchedEffect | |
import androidx.compose.runtime.getValue | |
import androidx.compose.runtime.mutableStateOf | |
import androidx.compose.runtime.remember | |
import androidx.compose.runtime.setValue | |
import androidx.compose.ui.Alignment | |
import androidx.compose.ui.ExperimentalComposeUiApi | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.draw.rotate | |
import androidx.compose.ui.draw.scale | |
import androidx.compose.ui.geometry.Offset | |
import androidx.compose.ui.graphics.Color | |
import androidx.compose.ui.graphics.ColorFilter | |
import androidx.compose.ui.graphics.lerp | |
import androidx.compose.ui.input.pointer.PointerEventType | |
import androidx.compose.ui.input.pointer.onPointerEvent | |
import androidx.compose.ui.layout.LayoutCoordinates | |
import androidx.compose.ui.layout.boundsInWindow | |
import androidx.compose.ui.layout.onGloballyPositioned | |
import androidx.compose.ui.layout.onSizeChanged | |
import androidx.compose.ui.unit.IntOffset | |
import kotlin.math.PI | |
import kotlin.math.atan2 | |
import kotlin.math.max | |
import kotlin.math.pow | |
import kotlin.math.roundToInt | |
import kotlin.math.sqrt | |
private val background = Color(0xff_000000) | |
private val primary = Color(0xff_7F52FF) | |
private val secondary = Color(0xff_E24462) | |
@Composable | |
fun FollowingArrows() { | |
var mousePosition by remember { mutableStateOf(Offset.Zero) } | |
var width by remember { mutableStateOf(0f) } | |
var height by remember { mutableStateOf(0f) } | |
Column( | |
Modifier | |
.onSizeChanged { | |
width = it.width.toFloat() | |
height = it.height.toFloat() | |
} | |
.fillMaxSize() | |
.background(background) | |
.onPointerEvent(PointerEventType.Move) { | |
mousePosition = it.changes.first().position | |
} | |
) { | |
for (i in 0..7) { | |
Row(Modifier.fillMaxSize().weight(1f)) { | |
for (j in 0..7) { | |
var layoutCoordinates: LayoutCoordinates? by remember { | |
mutableStateOf(null) | |
} | |
var rotation: Float by remember { | |
mutableStateOf(0f) | |
} | |
var scale: Float by remember { | |
mutableStateOf(1f) | |
} | |
var offset by remember { | |
mutableStateOf(Offset.Zero) | |
} | |
LaunchedEffect(layoutCoordinates, mousePosition) { | |
layoutCoordinates?.let { | |
val center = it.boundsInWindow().center | |
val delta = center - mousePosition | |
val angle = (atan2(delta.y, delta.x) * 180 / PI).toFloat() | |
rotation += ((((angle - rotation) % 360f) + 540f) % 360f) - 180f | |
val diagonal = sqrt(width.pow(2) + height.pow(2)) | |
val distance = sqrt(delta.x.pow(2) + delta.y.pow(2)) | |
val displacement = 100f | |
offset = Offset( | |
displacement * (delta.x / distance), | |
displacement * (delta.y / distance), | |
) | |
scale = max(1f - (distance / (diagonal * .9f)) * 1f, .4f) | |
} ?: 0f | |
} | |
val animatedRotation by animateFloatAsState( | |
targetValue = rotation, | |
animationSpec = spring( | |
stiffness = Spring.StiffnessVeryLow, | |
) | |
) | |
val animatedScale by animateFloatAsState( | |
targetValue = scale, | |
animationSpec = spring( | |
stiffness = Spring.StiffnessVeryLow, | |
dampingRatio = Spring.DampingRatioLowBouncy, | |
) | |
) | |
val animatedOffset by animateOffsetAsState( | |
targetValue = offset, | |
animationSpec = spring( | |
stiffness = Spring.StiffnessVeryLow, | |
dampingRatio = Spring.DampingRatioMediumBouncy, | |
) | |
) | |
Box( | |
Modifier | |
.onGloballyPositioned { | |
layoutCoordinates = it | |
} | |
.weight(1f) | |
.fillMaxHeight(), | |
contentAlignment = Alignment.Center, | |
) { | |
Image( | |
imageVector = Icons.Rounded.ArrowBack, | |
contentDescription = null, | |
modifier = Modifier | |
.offset { animatedOffset.toIntOffset() } | |
.rotate(animatedRotation) | |
.scale(animatedScale) | |
.fillMaxSize(), | |
colorFilter = ColorFilter.tint( | |
lerp(primary, secondary, 1f - scale) | |
) | |
) | |
} | |
} | |
} | |
} | |
} | |
} | |
fun Offset.toIntOffset(): IntOffset { | |
return IntOffset(x.roundToInt(), y.roundToInt()) | |
} |
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A live demo is available here https://zal.im/wasm/arrows/