FillPathArea.kt

/** filling the area under the path */
val fillPath = android.graphics.Path(stroke.asAndroidPath())
      .asComposePath()
      .apply {
          lineTo(xAxisSpace * xValues.last(), size.height - yAxisSpace)
          lineTo(xAxisSpace, size.height - yAxisSpace)
          close()
      }
drawPath(
    fillPath,
    brush = Brush.verticalGradient(
        listOf(
            Color.Cyan,
            Color.Transparent,
        ),
        endY = size.height - yAxisSpace
    ),
)