chess-blocked-pieces.kt

override fun dataPointAt(position: Position, state: GameSnapshotState): Datapoint? =
    valueAt(position, state)?.let { value ->
        Datapoint(
            value = value,
            label = null,
            colorScale = when (value) {
                0 -> Color.Red.copy(alpha = 0.35f) to Color.Unspecified
                else -> Color.Unspecified to Color.Unspecified
            },
        )
    }
    
private fun valueAt(position: Position, state: GameSnapshotState): Int? =
    when {
        state.board[position].isEmpty -> null
        else -> state.legalMovesFrom(position).size
    }