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60 lines
1.9 KiB
PowerShell
Executable File
60 lines
1.9 KiB
PowerShell
Executable File
<#
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.SYNOPSIS
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Writes a fractal
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.DESCRIPTION
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This PowerShell script writes an animated Mandelbrot fractal.
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.EXAMPLE
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PS> ./write-fractal.ps1
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.LINK
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https://github.com/fleschutz/PowerShell
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.NOTES
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Author: Markus Fleschutz | License: CC0
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#>
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function CalculateFractal([float]$left, [float]$top, [float]$xside, [float]$yside, [float]$zoom) {
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[int]$maxx = $rui.MaxWindowSize.Width
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[int]$maxy = $rui.MaxWindowSize.Height
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[float]$xscale = $xside / $maxx
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[float]$yscale = $yside / $maxy
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for ([int]$y = 0; $y -lt $maxy; $y++) {
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for ([int]$x = 0; $x -lt $maxx; $x++) {
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[float]$cx = $x * $xscale + $left
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[float]$cy = $y * $yscale + $top
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[float]$zx = 0
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[float]$zy = 0
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for ([int]$count = 0; ($zx * $zx + $zy * $zy -lt 4) -and ($count -lt $MAXCOUNT); $count++) {
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[float]$tempx = $zx * $zx - $zy * $zy + $cx
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$zy = $zoom * $zx * $zy + $cy
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$zx = $tempx
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}
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$global:buf[$y * $maxx + $x] = $([char](65 + $count))
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}
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}
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}
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$MAXCOUNT = 30
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$ui = (Get-Host).ui
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$rui = $ui.rawui
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[float]$left = -1.75
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[float]$top = -0.25
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[float]$xside = 0.25
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[float]$yside = 0.45
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$buffer0 = ""
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1..($rui.MaxWindowSize.Width * $rui.MaxWindowSize.Height) | ForEach-Object { $buffer0 += " " }
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$global:buf = $buffer0.ToCharArray()
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while ($true) {
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for ([float]$zoom = 4.0; $zoom -gt 1.1; $zoom -= 0.02) {
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CalculateFractal $left $top $xside $yside $zoom
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[console]::SetCursorPosition(0,0)
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[string]$Screen = New-Object system.string($global:buf, 0, $global:buf.Length)
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Write-Host -foreground green $Screen -noNewline
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}
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for ([float]$zoom = 1.1; $zoom -lt 4.0; $zoom += 0.02) {
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CalculateFractal $left $top $xside $yside $zoom
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[console]::SetCursorPosition(0,0)
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[string]$Screen = New-Object system.string($global:buf, 0, $global:buf.Length)
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Write-Host -foreground green $Screen -noNewline
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}
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}
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exit 0 # success |