lock mouse at close range

gistfile1.txt

Add-Type -AssemblyName System.Windows.Forms
[system.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | out-null
$c1 = [System.Windows.Forms.Cursor]::Position.X
$c2 = [System.Windows.Forms.Cursor]::Position.Y


for (;;) 
{
    $p1 = [System.Windows.Forms.Cursor]::Position.X
    $p2 = [System.Windows.Forms.Cursor]::Position.Y

    $sRadius = 80
    $bRadius =  [math]::Sqrt([Math]::Pow(($p1 - $c1),2) + [Math]::Pow(($p2 - $c2),2)) 


    if ( $bRadius -gt ($sRadius + 10))
    {
        $s1 = ((($p1 - $c1) * $sRadius) / $bRadius) + $c1
        $s2 = ((($p2 - $c2) * $sRadius) / $bRadius) + $c2

        [System.Windows.Forms.Cursor]::Position = New-Object System.Drawing.Point($s1, $s2) 
    }
}