Parametric Polymorphism in PowerShell, but in a single method o.O

Get-Distance.ps1

$point = new-object psobject
$point | Add-Member NoteProperty -Name X -Value 4
$point | Add-Member NoteProperty -Name Y -Value 0

$point2 = new-object psobject
$point2 | Add-Member NoteProperty -Name X -Value 0
$point2 | Add-Member NoteProperty -Name Y -Value 0


function Get-Distance {
  param(
    [Parameter(Position=0,Mandatory=$True)]
    [psobject]$origin,
    [Parameter(Position=1,Mandatory=$True,ParameterSetName="point")]
    [psobject]$point,
    [Parameter(Position=1,Mandatory=$True,ParameterSetName='xy')]
    [int]$x,
    [Parameter(Position=2,Mandatory=$True,ParameterSetName='xy')]
    [int]$y
  )
  switch ($PsCmdlet.ParameterSetName)
  {
    "point" {
      return [Math]::Sqrt( [Math]::Pow(($origin.x - $point.x),2) + [Math]::Pow(($origin.y - $point.y),2))
    }
    "xy" {
      return [Math]::Sqrt( [Math]::Pow(($origin.x - $x),2) + [Math]::Pow(($origin.y - $y),2))
    }
  }
}

Get-Distance $point $point2
Get-Distance $point 0 0