Type Property 型プロパティ

clear

A mode that clears any pixels that the source image overwrites.

Declaration 宣言 

static var clear: GraphicsContext.BlendMode { get }

Discussion 議論

With this mode, you can use the source image like an eraser.

This mode implements the equation R = 0 where R is the composite image.

See Also 参照

Accessing Porter-Duff Modes

static var copy: GraphicsContext.BlendMode
A mode that replaces background image samples with source image samples.
static var sourceIn: GraphicsContext.BlendMode
A mode that you use to paint the source image, including its transparency, onto the opaque parts of the background.
static var sourceOut: GraphicsContext.BlendMode
A mode that you use to paint the source image onto the transparent parts of the background, while erasing the background.
static var sourceAtop: GraphicsContext.BlendMode
A mode that you use to paint the opaque parts of the source image onto the opaque parts of the background.
static var destinationOver: GraphicsContext.BlendMode
A mode that you use to paint the source image under the background.
static var destinationIn: GraphicsContext.BlendMode
A mode that you use to erase any of the background that isn’t covered by opaque source pixels.
static var destinationOut: GraphicsContext.BlendMode
A mode that you use to erase any of the background that is covered by opaque source pixels.
static var destinationAtop: GraphicsContext.BlendMode
A mode that you use to paint the source image under the background, while erasing any of the background not matched by opaque pixels from the source image.
static var xor: GraphicsContext.BlendMode
A mode that you use to clear pixels where both the source and background images are opaque.