Types/Turtle/get_Mask.ps1
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<# .SYNOPSIS Gets a Turtle's mask .DESCRIPTION Gets a Turtle as an image mask. Everything under a white pixel will be visible. Everything under a black pixel will be invisible. .EXAMPLE # Masks will autoscale to the object bounding box by default # Make sure to leave a hole. turtle defines @( turtle id smallsquare width 84 height 84 @( ) teleport 21 21 square 42 @( ) fill black backgroundcolor white mask ) square 84 fill '#4488ff' stroke '#224488' pathattribute @{ mask='url(#smallsquare-mask)' } save ./square-mask.svg .EXAMPLE # Masks can contain morphing turtle defines @( turtle id smallsquare viewbox 84 @( 'fill','black' 'backgroundcolor','white' ) morph @( turtle teleport 21 21 square 42 turtle teleport 41.5 41.5 square 1 turtle teleport 21 21 square 42 ) duration '00:00:01.68' mask ) square 840 fill '#050506ff' stroke '#224488' pathattribute @{ mask='url(#smallsquare-mask)' } save ./square-mask-morph.svg .LINK https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Element/mask #> [OutputType([xml])] param() $keyPattern = '^mask/' $defaultId = "$($this.Id)-mask" # Gather the mask attributes, and default the ID (the only attribute we actually need) $maskAttributes = [Ordered]@{id=$defaultId} # Attributes can exist in .SVGAttribute or .Attribute foreach ($collectionName in 'SVGAttribute','Attribute') { # as long as they start with mask/ # (slashes are not valid attribute names, so this can denote a target name or type) foreach ($key in $this.$collectionName.Keys -match $keyPattern) { $maskAttributes[$key -replace $keyPattern] = $this.$collectionName[$key] } } # Create an attribute declaration $maskAttributes = @(foreach ($attributeName in $maskAttributes.Keys) { "$($attributeName)='$( [Web.HttpUtility]::HtmlAttributeEncode($maskAttributes[$attributeName]) )'" }) -join ' ' # Declare the mask segments $segments = @( "<mask $maskAttributes>" $this.SVG.OuterXml -replace '\<\?[^\>]+\>' "</mask>" ) # join them and cast to XML. [xml]($segments -join '') |