feat: Turtle.get/set_Opacity ( Fixes #115 )

Author: StartAutomating

Types/Turtle/get_Opacity.ps1

@@ -0,0 +1,14 @@
+<#
+.SYNOPSIS
+    Gets the turtle opacity
+.DESCRIPTION
+    Gets the opacity of the turtle path.
+#>
+if (-not $this.'.PathAttribute') {
+    $this | Add-Member -MemberType NoteProperty -Name '.PathAttribute' -Value ([Ordered]@{}) -Force
+}
+if ($this.'.PathAttribute'.'opacity') {
+    return $this.'.PathAttribute'.'opacity'
+} else {
+    return 1.0
+}

Types/Turtle/set_Opacity.ps1

@@ -0,0 +1,14 @@
+<#
+.SYNOPSIS
+    Sets the opacity
+.DESCRIPTION
+    Sets the opacity of the path
+.EXAMPLE
+    turtle forward 100 opacity 0.5 save ./dimLine.svg
+#>
+param(
+[double]
+$Opacity = 'nonzero'
+)
+
+$this.PathAttribute = [Ordered]@{'opacity' = $Opacity}