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A example to animate and draw a square-based Mandala on Jetpack Compose's Canvas
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import androidx.compose.animation.core.* | |
import androidx.compose.foundation.Canvas | |
import androidx.compose.foundation.background | |
import androidx.compose.foundation.layout.BoxWithConstraints | |
import androidx.compose.foundation.layout.fillMaxSize | |
import androidx.compose.runtime.Composable | |
import androidx.compose.runtime.getValue | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.geometry.Offset | |
import androidx.compose.ui.geometry.Size | |
import androidx.compose.ui.graphics.BlendMode | |
import androidx.compose.ui.graphics.Color | |
import androidx.compose.ui.graphics.ExperimentalGraphicsApi | |
import androidx.compose.ui.graphics.drawscope.Stroke | |
import androidx.compose.ui.graphics.drawscope.rotate | |
import androidx.compose.ui.graphics.drawscope.translate | |
import kotlin.math.abs | |
import kotlin.math.roundToInt | |
private const val repetitionCount = 10 | |
@Composable | |
fun InfiniteSquareMandala(modifier: Modifier) { | |
BoxWithConstraints( | |
Modifier | |
.background(Color.Black) | |
) { | |
val infiniteTransition = rememberInfiniteTransition() | |
val squareCount by infiniteTransition.animateFloat( | |
0f, | |
360f, | |
infiniteRepeatable( | |
tween( | |
5000, | |
easing = LinearEasing | |
), | |
repeatMode = RepeatMode.Reverse | |
) | |
) | |
val offset = (0..repetitionCount).map { index -> | |
infiniteTransition.animateFloat( | |
30f * (repetitionCount - index), | |
30f * repetitionCount, | |
infiniteRepeatable( | |
tween( | |
10000, | |
easing = LinearEasing | |
), | |
repeatMode = RepeatMode.Reverse | |
) | |
) | |
} | |
repeat(repetitionCount) { index -> | |
Canvas( | |
modifier = Modifier.then( | |
modifier | |
), | |
) { | |
translate( | |
constraints.maxWidth / 2f, | |
constraints.maxHeight / 2f, | |
) { | |
(0..squareCount.roundToInt() step 5).forEach { angle -> | |
val size = 50f * (index + 1) | |
rotate( | |
angle.toFloat(), | |
pivot = Offset(0f, 0f) | |
) { | |
drawRect( | |
Color.hsl( | |
20f, | |
abs(index / repetitionCount.toFloat() - 0.2f), | |
0.5f | |
), | |
topLeft = Offset( | |
offset[index].value, | |
offset[index].value | |
), | |
size = Size(size, size), | |
style = Stroke(index.toFloat()), | |
alpha = 1f / (index + 1) | |
) | |
} | |
} | |
} | |
} | |
} | |
} | |
} |
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