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AudioWaveform.kt
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AudioWaveform.kt
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package com.linc.audiowaveform
import android.view.MotionEvent
import androidx.compose.animation.core.AnimationSpec
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.requiredHeight
import androidx.compose.runtime.*
import androidx.compose.ui.ExperimentalComposeUiApi
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.CornerRadius
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.*
import androidx.compose.ui.graphics.drawscope.DrawStyle
import androidx.compose.ui.graphics.drawscope.Fill
import androidx.compose.ui.input.pointer.pointerInteropFilter
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.coerceIn
import androidx.compose.ui.unit.dp
import com.linc.audiowaveform.model.AmplitudeType
import com.linc.audiowaveform.model.WaveformAlignment
private val MinSpikeWidthDp: Dp = 1.dp
private val MaxSpikeWidthDp: Dp = 24.dp
private val MinSpikePaddingDp: Dp = 0.dp
private val MaxSpikePaddingDp: Dp = 12.dp
private val MinSpikeRadiusDp: Dp = 0.dp
private val MaxSpikeRadiusDp: Dp = 12.dp
private const val MinProgress: Float = 0F
private const val MaxProgress: Float = 1F
private const val MinSpikeHeight: Float = 1F
private const val DefaultGraphicsLayerAlpha: Float = 0.99F
@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun AudioWaveform(
modifier: Modifier = Modifier,
style: DrawStyle = Fill,
waveformBrush: Brush = SolidColor(Color.White),
progressBrush: Brush = SolidColor(Color.Blue),
waveformAlignment: WaveformAlignment = WaveformAlignment.Center,
amplitudeType: AmplitudeType = AmplitudeType.Avg,
onProgressChangeFinished: (() -> Unit)? = null,
spikeAnimationSpec: AnimationSpec<Float> = tween(500),
spikeWidth: Dp = 4.dp,
spikeRadius: Dp = 2.dp,
spikePadding: Dp = 1.dp,
progress: Float = 0F,
amplitudes: List<Int>,
onProgressChange: (Float) -> Unit
) {
val _progress = remember(progress) { progress.coerceIn(MinProgress, MaxProgress) }
val _spikeWidth = remember(spikeWidth) { spikeWidth.coerceIn(MinSpikeWidthDp, MaxSpikeWidthDp) }
val _spikePadding = remember(spikePadding) { spikePadding.coerceIn(MinSpikePaddingDp, MaxSpikePaddingDp) }
val _spikeRadius = remember(spikeRadius) { spikeRadius.coerceIn(MinSpikeRadiusDp, MaxSpikeRadiusDp) }
val _spikeTotalWidth = remember(spikeWidth, spikePadding) { _spikeWidth + _spikePadding }
var canvasSize by remember { mutableStateOf(Size(0f, 0f)) }
var spikes by remember { mutableStateOf(0F) }
val spikesAmplitudes = remember(amplitudes, spikes, amplitudeType) {
amplitudes.toDrawableAmplitudes(
amplitudeType = amplitudeType,
spikes = spikes.toInt(),
minHeight = MinSpikeHeight,
maxHeight = canvasSize.height.coerceAtLeast(MinSpikeHeight)
)
}.map { animateFloatAsState(it, spikeAnimationSpec).value }
Canvas(
modifier = Modifier
.fillMaxWidth()
.requiredHeight(48.dp)
.graphicsLayer(alpha = DefaultGraphicsLayerAlpha)
.pointerInteropFilter {
return@pointerInteropFilter when (it.action) {
MotionEvent.ACTION_DOWN,
MotionEvent.ACTION_MOVE -> {
if (it.x in 0F..canvasSize.width) {
onProgressChange(it.x / canvasSize.width)
true
} else false
}
MotionEvent.ACTION_UP -> {
onProgressChangeFinished?.invoke()
true
}
else -> false
}
}
.then(modifier)
) {
canvasSize = size
spikes = size.width / _spikeTotalWidth.toPx()
spikesAmplitudes.forEachIndexed { index, amplitude ->
drawRoundRect(
brush = waveformBrush,
topLeft = Offset(
x = index * _spikeTotalWidth.toPx(),
y = when(waveformAlignment) {
WaveformAlignment.Top -> 0F
WaveformAlignment.Bottom -> size.height - amplitude
WaveformAlignment.Center -> size.height / 2F - amplitude / 2F
}
),
size = Size(
width = _spikeWidth.toPx(),
height = amplitude
),
cornerRadius = CornerRadius(_spikeRadius.toPx(), _spikeRadius.toPx()),
style = style
)
drawRect(
brush = progressBrush,
size = Size(
width = _progress * size.width,
height = size.height
),
blendMode = BlendMode.SrcAtop
)
}
}
}
private fun List<Int>.toDrawableAmplitudes(
amplitudeType: AmplitudeType,
spikes: Int,
minHeight: Float,
maxHeight: Float
): List<Float> {
val amplitudes = map(Int::toFloat)
if(amplitudes.isEmpty() || spikes == 0) {
return List(spikes) { minHeight }
}
val transform = { data: List<Float> ->
when(amplitudeType) {
AmplitudeType.Avg -> data.average()
AmplitudeType.Max -> data.max()
AmplitudeType.Min -> data.min()
}.toFloat().coerceIn(minHeight, maxHeight)
}
return when {
spikes > amplitudes.count() -> amplitudes.fillToSize(spikes, transform)
else -> amplitudes.chunkToSize(spikes, transform)
}.normalize(minHeight, maxHeight)
}