micarrsim/scripts/generate-array-fixture.ps1

$ErrorActionPreference = 'Stop'
$projectRoot = [System.IO.Path]::GetFullPath((Join-Path $PSScriptRoot '..'))
$utf8WithoutBom = [System.Text.UTF8Encoding]::new($false)

function New-CoordinateSystem {
    return [ordered]@{
        handedness = 'right'
        xAxis       = 'right'
        yAxis       = 'up'
        zAxis       = 'toward-scene'
    }
}

function New-RectangularArray {
    param(
        [Parameter(Mandatory = $true)][string]$Id,
        [Parameter(Mandatory = $true)][string]$Name,
        [Parameter(Mandatory = $true)][string]$Description,
        [Parameter(Mandatory = $true)][int]$Columns,
        [Parameter(Mandatory = $true)][int]$Rows,
        [Parameter(Mandatory = $true)][double]$Width,
        [Parameter(Mandatory = $true)][double]$Height
    )

    $microphones = [System.Collections.Generic.List[object]]::new()
    for ($row = 0; $row -lt $Rows; $row++) {
        for ($column = 0; $column -lt $Columns; $column++) {
            $index = $row * $Columns + $column
            $x = if ($Columns -eq 1) { 0 } else { -$Width / 2 + $column * $Width / ($Columns - 1) }
            $y = if ($Rows -eq 1) { 0 } else { -$Height / 2 + $row * $Height / ($Rows - 1) }
            $microphones.Add([ordered]@{
                id       = 'mic-{0:D3}' -f ($index + 1)
                position = @([Math]::Round($x, 6), [Math]::Round($y, 6), 0)
            })
        }
    }

    return [ordered]@{
        schemaVersion    = '1.0.0'
        kind             = 'micarrsim.array'
        id               = $Id
        name             = $Name
        description      = $Description
        units            = 'm'
        coordinateSystem = New-CoordinateSystem
        aperture         = [ordered]@{ width = $Width; height = $Height }
        microphones      = $microphones
    }
}

function Write-ArrayFixture {
    param([Parameter(Mandatory = $true)]$Definition)

    $outputPath = Join-Path $projectRoot "assets/array-geometries/$($Definition.id).array.json"
    $json = $Definition | ConvertTo-Json -Depth 8
    [System.IO.File]::WriteAllText($outputPath, $json + [Environment]::NewLine, $utf8WithoutBom)
    Write-Host "Generated $($Definition.microphones.Count) microphones: $outputPath"
}

$rectangularFixtures = @(
    @{
        Id          = 'rectangular-2x2-450mm'
        Name        = '2x2 sparse rectangular'
        Description = '4-channel uniform rectangular layout on the 0.45 m reference aperture'
        Columns     = 2
        Rows        = 2
        Width       = 0.45
        Height      = 0.45
    },
    @{
        Id          = 'rectangular-4x3-450mm'
        Name        = '4x3 sparse rectangular'
        Description = '12-channel uniform rectangular layout on the 0.45 m reference aperture'
        Columns     = 4
        Rows        = 3
        Width       = 0.45
        Height      = 0.45
    },
    @{
        Id          = 'rectangular-8x6-450mm'
        Name        = '8x6 rectangular'
        Description = '48-channel uniform rectangular layout on the 0.45 m reference aperture'
        Columns     = 8
        Rows        = 6
        Width       = 0.45
        Height      = 0.45
    },
    @{
        Id          = 'rectangular-16x12'
        Name        = '16x12 rectangular baseline'
        Description = '192-channel uniform rectangular layout on a 0.45 m square aperture'
        Columns     = 16
        Rows        = 12
        Width       = 0.45
        Height      = 0.45
    },
    @{
        Id          = 'rectangular-24x16-450mm'
        Name        = '24x16 dense rectangular'
        Description = '384-channel uniform rectangular layout on the 0.45 m reference aperture'
        Columns     = 24
        Rows        = 16
        Width       = 0.45
        Height      = 0.45
    },
    @{
        Id          = 'rectangular-16x12-compact'
        Name        = '16x12 compact rectangular'
        Description = '192-channel uniform rectangular layout on a 0.12 m square aperture'
        Columns     = 16
        Rows        = 12
        Width       = 0.12
        Height      = 0.12
    },
    @{
        Id          = 'rectangular-16x12-large'
        Name        = '16x12 large rectangular'
        Description = '192-channel uniform rectangular layout on a 1.20 m square aperture for spatial-aliasing comparison'
        Columns     = 16
        Rows        = 12
        Width       = 1.2
        Height      = 1.2
    }
)

foreach ($fixture in $rectangularFixtures) {
    Write-ArrayFixture (New-RectangularArray @fixture)
}

$spiralMicrophones = [System.Collections.Generic.List[object]]::new()
$microphoneCount = 192
$radius = 0.225
$goldenAngle = [Math]::PI * (3 - [Math]::Sqrt(5))

for ($index = 0; $index -lt $microphoneCount; $index++) {
    $microphoneRadius = $radius * [Math]::Sqrt(($index + 0.5) / $microphoneCount)
    $angle = $index * $goldenAngle
    $x = $microphoneRadius * [Math]::Cos($angle)
    $y = $microphoneRadius * [Math]::Sin($angle)
    $spiralMicrophones.Add([ordered]@{
        id       = 'mic-{0:D3}' -f ($index + 1)
        position = @([Math]::Round($x, 6), [Math]::Round($y, 6), 0)
    })
}

$spiralDefinition = [ordered]@{
    schemaVersion    = '1.0.0'
    kind             = 'micarrsim.array'
    id               = 'fermat-spiral-192'
    name             = '192-channel Fermat spiral'
    description      = 'Equal-area Fermat spiral on a 0.45 m circular aperture for comparison with the rectangular baseline'
    units            = 'm'
    coordinateSystem = New-CoordinateSystem
    aperture         = [ordered]@{ width = 0.45; height = 0.45 }
    microphones      = $spiralMicrophones
}

Write-ArrayFixture $spiralDefinition