# 1:1 打印一张 A4 图（PNG，整页 210x297 mm）—— 不经过 PDF 阅读器，比例由程序定死。
#   powershell -ExecutionPolicy Bypass -File .claude\r2\print\print_1to1.ps1 -Image .claude\r2\print\blade_1to1.png [-Printer "EPSON3F4E59 (L4260 Series)"]
# 做法：System.Drawing.Printing.PrintDocument，Graphics.PageUnit = 毫米，图画成 210x297 mm；
#   OriginAtMargins=false 时 Graphics 原点在「可打印区」左上角（硬边距处），所以再往回挪一个硬边距，让图的原点落在纸角上。
#   ⚠ 打印机驱动里如果开了「缩放以适合页面 / 无边距放大」，还是会被缩 —— 打出来量标尺为准。
param([Parameter(Mandatory = $true)][string]$Image, [string]$Printer = '')
Add-Type -AssemblyName System.Drawing
$path = (Resolve-Path $Image).Path
$img = [System.Drawing.Image]::FromFile($path)
$pd = New-Object System.Drawing.Printing.PrintDocument
if ($Printer) { $pd.PrinterSettings.PrinterName = $Printer }
if (-not $pd.PrinterSettings.IsValid) { throw "打印机不可用: $($pd.PrinterSettings.PrinterName)" }
$pd.DocumentName = 'PhoneRail blade 1to1'
$a4 = $pd.PrinterSettings.PaperSizes | Where-Object { $_.Kind -eq [System.Drawing.Printing.PaperKind]::A4 } | Select-Object -First 1
if ($a4) { $pd.DefaultPageSettings.PaperSize = $a4 }
$pd.DefaultPageSettings.Landscape = $false
$pd.OriginAtMargins = $false
$script:hm = $null
$pd.add_PrintPage({
    param($s, $e)
    $g = $e.Graphics
    $g.PageUnit = [System.Drawing.GraphicsUnit]::Millimeter
    $g.InterpolationMode = [System.Drawing.Drawing2D.InterpolationMode]::HighQualityBicubic
    $hx = $e.PageSettings.HardMarginX * 0.254          # 1/100 英寸 -> mm
    $hy = $e.PageSettings.HardMarginY * 0.254
    $script:hm = "{0:N2} / {1:N2} mm" -f $hx, $hy
    $g.DrawImage($img, [single](-$hx), [single](-$hy), [single]210, [single]297)
    $e.HasMorePages = $false
})
$pd.Print()
$img.Dispose()
"已提交打印：$($pd.PrinterSettings.PrinterName)，纸 $($pd.DefaultPageSettings.PaperSize.PaperName)，硬边距 $script:hm，图按 210x297 mm 画"