Set the opacity of the annotation. This function can be used for annotations of types t_line and t_scribble. The default opacity is 1.0.Documents conforming to PDF / A must use an opacity of 1.0.

public void setOpacity(
	double opacity
)

Public Sub setOpacity ( 
	opacity As Double
)

public:
void setOpacity(
	double opacity
)

member setOpacity : 
        opacity : float -> unit