opacity(_:)
Returns a new style based on the current style that multiplies by opacity when drawing.
Declaration
static func opacity(_ opacity: Double) -> some ShapeStyle
Discussion
In most contexts the current style is the foreground but e.g. when setting the value of the background style, that becomes the current implicit style.
For example, a circle filled with the current foreground style at fifty-percent opacity:
Circle().fill(.opacity(0.5))