Scripts/galaxy-spiral.ps1
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$esc = [char]27 $reset = "$esc[0m" $ansiPattern = "$([char]27)\[[0-9;]*m" function Write-AlignedLine { param([string]$text, [int]$width) $visible = ([regex]::Replace($text, $ansiPattern, '')).Length if ($visible -lt $width) { $text += ' ' * ($width - $visible) } Write-Host ($text + $reset) } function Convert-HsvToRgb { param( [double]$Hue, [double]$Saturation, [double]$Value ) $h = ($Hue % 1) * 6 $sector = [math]::Floor($h) $fraction = $h - $sector $p = $Value * (1 - $Saturation) $q = $Value * (1 - $fraction * $Saturation) $t = $Value * (1 - (1 - $fraction) * $Saturation) switch ($sector) { 0 { $r = $Value; $g = $t; $b = $p } 1 { $r = $q; $g = $Value; $b = $p } 2 { $r = $p; $g = $Value; $b = $t } 3 { $r = $p; $g = $q; $b = $Value } 4 { $r = $t; $g = $p; $b = $Value } default { $r = $Value; $g = $p; $b = $q } } return @([int][math]::Round($r * 255), [int][math]::Round($g * 255), [int][math]::Round($b * 255)) } $rows = 28 $cols = 70 $targetWidth = 120 Write-Host for ($y = 0; $y -lt $rows; $y++) { $sb = [System.Text.StringBuilder]::new() for ($x = 0; $x -lt $cols; $x++) { $centerX = $cols / 2.0 $centerY = $rows / 2.0 $dx = $x - $centerX $dy = $y - $centerY $distance = [math]::Sqrt($dx * $dx + $dy * $dy) / [math]::Max($centerX, $centerY) $angle = [math]::Atan2($dy, $dx) $spiral1 = [math]::Abs([math]::Log($distance + 0.1) * 2 + $angle * 3 / [math]::PI) % 2 - 1 $spiral2 = [math]::Abs([math]::Log($distance + 0.1) * 2 + ($angle + [math]::PI) * 3 / [math]::PI) % 2 - 1 $arm = [math]::Min([math]::Abs($spiral1), [math]::Abs($spiral2)) $core = 1 - $distance $starField = [math]::Sin($x * 0.5 + $y * 0.3) * [math]::Cos($x * 0.7 - $y * 0.4) $galaxy = [math]::Max($core * 0.5, $arm * 0.8) + [math]::Abs($starField) * 0.2 $hue = 0.6 - 0.4 * $distance + 0.2 * [math]::Sin($galaxy * 4) # Blue center to yellow arms $sat = 0.8 + 0.2 * $galaxy $val = 0.2 + 0.8 * $galaxy $rgb = Convert-HsvToRgb -Hue $hue -Saturation ([math]::Min([math]::Max($sat, 0.0), 1.0)) -Value ([math]::Min([math]::Max($val, 0.0), 1.0)) $symbols = @(' ', '.', '*', '✦', '✧', '✩', '✪', '✫') $symbolIndex = [math]::Floor($galaxy * $symbols.Length) % $symbols.Length $symbol = $symbols[$symbolIndex] $null = $sb.Append("$esc[38;2;$($rgb[0]);$($rgb[1]);$($rgb[2])" + "m$symbol") } Write-AlignedLine ($sb.ToString()) $targetWidth } Write-Host $reset |