Types/Turtle/set_Stroke.ps1
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<# .SYNOPSIS Sets a Turtle's stroke color .DESCRIPTION Sets one or more colors used to stroke the Turtle. By default, this is transparent. If more than one value is provided, the stroke will be a gradient. .EXAMPLE # Draw a blue square turtle square 42 stroke blue .EXAMPLE # Draw a PowerShell blue square turtle square 42 stroke '#4488ff' .EXAMPLE # Draw a red, green, blue gradient turtle square 42 stroke red green blue show .EXAMPLE # Draw a red, green, blue linear gradient turtle square 42 stroke red green blue linear show .EXAMPLE turtle flower stroke red green blue strokerule evenodd show #> param( [PSObject[]] $stroke = 'transparent' ) # If we have no stroke information, return if (-not $stroke) { return } # If the stroke count is greater than one, try to make a graidnet if ($stroke.Count -gt 1) { # Default to a radial gradient $gradientTypeHint = 'radial' # and create a collection for attributes $gradientAttributes = [Ordered]@{ # default our identifier to the current id plus `stroke-gradient` # (so we could have multiple gradients without a collision) id="$($this.id)-stroke-gradient" } $stroke = @(foreach ($color in $stroke) { # If the value matches `linear` or `radial` if ($color -match '^(linear|radial)') { # take the hint and make it the right type of gradient. $gradientTypeHint = ($color -replace 'gradient').ToLower() } # If the color was `pad`, `reflect`, or `repeat` elseif ($strokeColor -in 'pad', 'reflect', 'repeat') { # take the hint and set the spreadMethod $gradientAttributes['spreadMethod'] = $color } # If the stroke is a dictionary elseif ($color -is [Collections.IDictionary]) { # propagate the values into attributes. foreach ($gradientAttributeKey in $color.Keys) { $gradientAttributes[$gradientAttributeKey] = $color[$gradientAttributeKey] } } # Otherwise output the color else { $color } }) # If we have no stroke colors after filtering, return if (-not $stroke) { return } # If our count is one if ($stroke.Count -eq 1) { # it's not really going to be a gradient, so just use the one color. $this | Add-Member -MemberType NoteProperty -Name '.Stroke' -Value $stroke -Force return } # Now we have at least two colors we want to be a gradient # We need to make sure the offset starts at 0% an ends at 100% # and so we actually need to divide by one less than our stroke color, so we end at 100%. $offsetStep = 1 / ($stroke.Count - 1) $Gradient = @( # Construct our gradient element. "<${gradientTypeHint}Gradient$( # propagate our attributes @(foreach ($gradientAttributeKey in $gradientAttributes.Keys) { " $gradientAttributeKey='$($gradientAttributes[$gradientAttributeKey])'" }) -join '' )>" @( # and put in our stop colors for ($strokeNumber = 0; $strokeNumber -lt $stroke.Count; $strokeNumber++) { "<stop offset='$($offsetStep * $strokeNumber * 100)%' stop-color='$($stroke[$strokeNumber])' />" } ) "</${gradientTypeHint}Gradient>" ) -join [Environment]::NewLine # add this gradient to our defines $this.Defines += $Gradient # and set stroke to this gradient. $stroke = "url(`"#$($gradientAttributes.id)`")" } if (-not $this.'.stroke') { $this | Add-Member -MemberType NoteProperty -Name '.Stroke' -Value $stroke -Force } else { $this.'.stroke' = $stroke } |