Warp.kt

@Composable
fun Warp(
  modifier: Modifier = Modifier,
  novasInFrame: Int = 5,
  acceleration: Int = 15,
  cometFactor: Float = 0.2f,
  lineWidth: Dp = 1.dp,
) {
  val particles = remember { arrayListOf<Particle>() }
  var frame by remember { mutableLongStateOf(0L) }
  Canvas(modifier = modifier) {
    repeat(novasInFrame) { particles.add(Particle(Random.nextDouble(6.283185307179586), frame)) }
    val iterator = particles.iterator()
    while (iterator.hasNext()) {
      val particle = iterator.next()
      val lifetime = frame - particle.createdAt
      val start = Offset(
        size.center.x + lifetime * cos(particle.radian).toFloat(),
        size.center.y + lifetime * sin(particle.radian).toFloat(),
      )
      val lineLength = calculateDistance(size.center, start) * cometFactor
      val end = Offset(
        size.center.x + (lifetime - lineLength) * cos(particle.radian).toFloat(),
        size.center.y + (lifetime - lineLength) * sin(particle.radian).toFloat(),
      )
      if (end.x < 0 || end.y < 0 || end.x > size.width || end.y > size.height) {
        iterator.remove()
      } else {
        drawLine(Color.Black, start, end, lineWidth.toPx())
      }
    }
    frame+=acceleration
  }
}

data class Particle(val radian: Double, val createdAt: Long)

private fun calculateDistance(p1: Offset, p2: Offset): Float {
  val dx = p2.x - p1.x
  val dy = p2.y - p1.y
  return sqrt(dx.pow(2) + dy.pow(2))
}

Screen_recording_20240518_032853.mp4