Scripts/nebula.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 = 24 $cols = 60 $targetWidth = 120 Write-Host for ($y = 0; $y -lt $rows; $y++) { $sb = [System.Text.StringBuilder]::new() for ($x = 0; $x -lt $cols; $x++) { $cloud1 = [math]::Sin($x * 0.02 + $y * 0.03) * [math]::Cos($x * 0.01 - $y * 0.02) $cloud2 = [math]::Sin($x * 0.04 - $y * 0.05) * [math]::Cos($x * 0.03 + $y * 0.04) $cloud3 = [math]::Sin($x * 0.06 + $y * 0.07) * [math]::Cos($x * 0.05 - $y * 0.06) $density = [math]::Abs($cloud1 + $cloud2 + $cloud3) / 3 $hue = ($density + ($x + $y) * 0.005) % 1 $sat = 0.6 + 0.4 * $density $val = 0.2 + 0.8 * $density $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)) $stars = @(' ', '.', '*', '✦', '✧') $starIndex = [math]::Floor($density * $stars.Length) $symbol = $stars[[math]::Min($starIndex, $stars.Length - 1)] $null = $sb.Append("$esc[38;2;$($rgb[0]);$($rgb[1]);$($rgb[2])" + "m$symbol") } Write-AlignedLine ($sb.ToString()) $targetWidth } Write-Host $reset |