Instance Property インスタンスプロパティ

opacity

The opacity of drawing operations in the context.

Declaration 宣言 

var opacity: Double { get set }

Discussion 議論

Set this value to affect the opacity of content that you subsequently draw into the context. Changing this value has no impact on the content you previously drew into the context.

See Also 参照

Setting Opacity and the Blend Mode

var blendMode: GraphicsContext.BlendMode
The blend mode used by drawing operations in the context.
struct BlendMode
The ways that a graphics context combines new content with background content.