feat: Gradient.SVG ( Fixes #5 )

Author: StartAutomating

Types/Gradient/get_SVG.ps1

@@ -0,0 +1,49 @@
+<#
+.SYNOPSIS
+    Gets a SVG gradient
+.DESCRIPTION
+    Gets the gradient as SVG.
+
+    SVG Gradients are a bit more picky than their CSS counterpart,
+    and do not support conic gradients.
+
+#>
+$gradientTypeHint = $this.GradientType
+if (-not $gradientTypeHint) {
+    $gradientTypeHint = 'radial'
+}
+if ($gradientTypeHint) {
+    $gradientTypeHint = $gradientTypeHint -replace '-gradient', 'Gradient'
+    $gradientTypeHint = $gradientTypeHint.Substring(0,1).ToLower() + $gradientTypeHint.Substring(1)
+}
+# AFAIK, SVG does not support conic gradients.
+if ($gradientTypeHint -match 'conic') { return }
+$gradientValues = @(foreach ($in in $this.input) {
+    if ($in -match '\#[a-f0-9]{6}') {
+        $matches.0
+    }
+})
+if (-not $gradientValues) { return }
+if ($gradientValues.Count -eq 1) {
+    $gradientValues = @($gradientValues) * 2
+}
+
+# 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 fill color, so we end at 100%.
+$offsetStep = 1 / ($gradientValues.Count - 1)
+
+@(
+    # Construct our gradient element.
+    "<${gradientTypeHint}$(
+        # propagate our attributes                
+        " id='${gradientTypeHint}-$($gradientValues -replace '#' -join '-')'"                
+    )>"
+    @(
+        # and put in our stop colors
+        for ($StopNumber = 0; $StopNumber -lt $gradientValues.Count; $StopNumber++) {
+            "<stop offset='$($offsetStep * $StopNumber * 100)%' stop-color='$($gradientValues[$StopNumber])' />"
+        }
+    )
+    "</${gradientTypeHint}>"
+) -join [Environment]::NewLine