RectangleD 构造函数 (Double, Double, Double, Double)

public RectangleD(
	double x,
	double y,
	double width,
	double height
)

Public Sub New ( 
	x As Double,
	y As Double,
	width As Double,
	height As Double
)

public:
RectangleD(
	double x, 
	double y, 
	double width, 
	double height
)

new : 
        x : float * 
        y : float * 
        width : float * 
        height : float -> RectangleD