feat: Turtle.SierpinskiCurve ( Fixes #39 )

Author: StartAutomating

Turtle.types.ps1xml

@@ -221,6 +221,46 @@ $this.Heading += $Angle
 return $this
                     </Script>
       </ScriptMethod>
+      <ScriptMethod>
+        <Name>SierpinskiCurve</Name>
+        <Script>
+                        &lt;#
+.SYNOPSIS
+    Generates a Sierpinski Curve.
+.DESCRIPTION
+    Generates a Sierpinski Curve using turtle graphics.
+.LINK
+    https://en.wikipedia.org/wiki/Sierpi%C5%84ski_curve#Representation_as_Lindenmayer_system
+.EXAMPLE
+    $turtle.SierpinskiCurve().Pattern.Save("$pwd/SierpinskiCurve.svg")
+.EXAMPLE
+    $turtle.Clear()
+    $turtle.SierpinskiCurve(10,4)
+    $turtle.PatternTransform = @{
+        'scale' = 0.9        
+    }    
+    $turtle.PatternAnimation = "
+    &lt;animateTransform attributeName='patternTransform' attributeType='XML' type='scale' values='1;0.9;1' dur='19s' repeatCount='indefinite' additive='sum' /&gt;
+    &lt;animateTransform attributeName='patternTransform' attributeType='XML' type='skewY' values='0;-30;30;-30;0' dur='67s' repeatCount='indefinite' additive='sum' /&gt;
+    &lt;animateTransform attributeName='patternTransform' attributeType='XML' type='skewX' values='0;-30;30;-30;0' dur='83s' repeatCount='indefinite' additive='sum' /&gt;
+    "
+    $turtle.Pattern.Save("$pwd/SierpinskiCurve2.svg")
+#&gt;
+param(
+    [double]$Size = 20,
+    [int]$Order = 4,
+    [double]$Angle = 45
+)
+return $this.L('F--XF--F--XF',  [Ordered]@{
+    X ='XF+G+XF--F--XF+G+X'
+}, $Order, [Ordered]@{
+    '\+'    = { $this.Rotate($Angle) }
+    '-'     = { $this.Rotate($Angle * -1) }
+    '[FG]'  = { $this.Forward($Size) }
+})
+
+                    </Script>
+      </ScriptMethod>
       <ScriptMethod>
         <Name>SierpinskiTriangle</Name>
         <Script>