Commands/Shapes/SVG.Star.ps.ps1
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function SVG.Star { <# .SYNOPSIS SVG Star .DESCRIPTION Creates a Star of an number of points. .LINK SVG.Path .LINK SVG.ConvexPolygon #> [inherit('SVG.Path', Abstract,Dynamic, ExcludeParameter='D')] [CmdletBinding(PositionalBinding=$false)] param( # The number of points in the star. # This is also aliased to -SideCount for consistent use with SVG.ConvexPolygon, # (even if this is not mathematically accurate). [Parameter(ValueFromPipelineByPropertyName,Position=0)] [ValidateRange(3,360)] [Alias('PC','Points','SC','SideCount','Sides','NumSides')] [int] $PointCount = 5, # The initial rotation of the polygon. [Parameter(ValueFromPipelineByPropertyName)] [Alias('Rotation')] [double] $Rotate = 0, # The center X coordinate for the polygon. [Parameter(ValueFromPipelineByPropertyName)] [Alias('CX')] [double] $CenterX = 1, # The center Y coordinate for the polygon. [Parameter(ValueFromPipelineByPropertyName)] [Alias('CY')] [double] $CenterY = 1, # The radius of the polygon. [Parameter(ValueFromPipelineByPropertyName)] [Alias('R')] [double] $Radius = 1 ) process { # We can construct a regular polygon by creating N points along a unit circle $anglePerPoint = 360 / $PointCount $r = $Radius $angle = $Rotate $q = 2 $points = @() $vertices = @( foreach ($sideNumber in 1..$PointCount) { $pointY = $centerY + $r * [math]::round([math]::cos($angle * [Math]::PI/180),15) $pointX = $centerX + $r * [math]::round([math]::sin($angle * [Math]::PI/180),15) "$pointX $pointY" $angle += $anglePerPoint }) if ($vertices.Count % 2) { for ($pointIndex = 0; $points.Length -lt $PointCount; $pointIndex += $q) { $vertex = $vertices[$pointIndex % $vertices.Count] if (-not $points) { $points += "M $($vertices[$pointIndex % $vertices.Count])" } else { $points += "L $($vertices[$pointIndex % $vertices.Count])" } } $points += "L $($vertices[0])" } else { for ($pointIndex = 0; $pointIndex -le $vertices.Count; $pointIndex += $q) { $points += if ($pointIndex -eq 0) { "M $($vertices[$pointIndex % $vertices.Count])" } else { "L $($vertices[$pointIndex % $vertices.Count])" } } for ($pointIndex = 1; $pointIndex -le ($vertices.Count + 1); $pointIndex += $q) { $points += if ($pointIndex -eq 1) { "M $($vertices[$pointIndex % $vertices.Count])" } else { "L $($vertices[$pointIndex % $vertices.Count])" } } } $myParams = [Ordered]@{} + $PSBoundParameters $myParams["D"] = $points -join ' ' $myParams.Remove('PointCount') $myParams.Remove('Rotate') $myParams.Remove('Radius') $myParams.Remove('CenterX') $myParams.Remove('CenterY') svg.Path @myParams } } |