DragCallback Delegate

public delegate SamplerStatus DragCallback(
        Point3d current,
        ref Matrix3d xform
)

Public Delegate Function DragCallback ( 
        current As Point3d,
        ByRef xform As Matrix3d
) As SamplerStatus

public delegate SamplerStatus DragCallback(
        Point3d current, 
        Matrix3d% xform
)

type DragCallback = 
    delegate of 
        current : Point3d * 
        xform : Matrix3d byref -> SamplerStatus