How to make an app resizable and with custom angles.

[Bondarenko1990]

I need my application to have 20 angles and be able to resize.

I set the fields in Window like this:
ExtendClientAreaChromeHints="NoChrome"
TransparencyLevelHint="Transparent"
Background="Transparent"
SystemDecorations="BorderOnly"
ExtendClientAreaToDecorationsHint="True"

Please tell me how I can implement this?

[LaurentInSeattle]

See: #10444

[maxkatz6]

Also #17354

[Bondarenko1990]

See: #10444

Thanks. But this sample is not resizable.

[Bondarenko1990]

Also #17354

Thanks.
I would like more flexibility in setting corners. In your example there are only 4 options, the largest corner("Round") is 12, and I need 20.
public enum WindowCornerPreference
{
Default,
DoNotRound,
Round,
RoundSmall
}