Defines a TwirlFilter effect to process the image. This class cannot be inherited. The basic idea is from the polar coordinate. Suppose we convert each pixel coordinate to polar system, and change the angle, then convert it back, you will get a twirl feeling.

public: class TwirlFilter : public BaseOffsetFilter;

public sealed class TwirlFilter : BaseOffsetFilter;

Public sealed Class TwirlFilter
Inherits BaseOffsetFilter