ColorRamp 构造函数

public ColorRamp(
	int iColorLength = 64,
	int iAlpha = 255
)

Public Sub New ( 
	Optional iColorLength As Integer = 64,
	Optional iAlpha As Integer = 255
)

public:
ColorRamp(
	int iColorLength = 64, 
	int iAlpha = 255
)

new : 
        ?iColorLength : int * 
        ?iAlpha : int 
(* Defaults:
        let _iColorLength = defaultArg iColorLength 64
        let _iAlpha = defaultArg iAlpha 255
*)
-> ColorRamp