Structure

GraphicsContext.Filter

A type that applies image processing operations to rendered content.

Declaration 宣言

struct Filter

Overview 概要

Create and configure a filter that produces an image processing effect, like adding a drop shadow or a blur effect, by calling one of the factory methods defined by the Filter structure. Call the addFilter(_:options:) method to add the filter to a GraphicsContext. The filter only affects content that you draw into the context after adding the filter.

Topics 話題

Changing Brightness and Contrast

static func brightness(Double) -> GraphicsContext.Filter

Returns a filter that applies a brightness adjustment.

static func contrast(Double) -> GraphicsContext.Filter

Returns a filter that applies a contrast adjustment.

Manipulating Color

static func saturation(Double) -> GraphicsContext.Filter

Returns a filter that applies a saturation adjustment.

static func colorInvert(Double) -> GraphicsContext.Filter

Returns a filter that inverts the color of their results.

static func colorMultiply(Color) -> GraphicsContext.Filter

Returns a filter that multiplies each color component by the matching component of a given color.

static func hueRotation(Angle) -> GraphicsContext.Filter

Returns a filter that applies a hue rotation adjustment.

static func grayscale(Double) -> GraphicsContext.Filter

Returns a filter that applies a grayscale adjustment.

static func colorMatrix(ColorMatrix) -> GraphicsContext.Filter

Returns a filter that multiplies by a given color matrix.

Adding Blur

static func blur(radius: CGFloat, options: GraphicsContext.BlurOptions) -> GraphicsContext.Filter

Returns a filter that applies a Gaussian blur.

Adding a Shadow

static func shadow(color: Color, radius: CGFloat, x: CGFloat, y: CGFloat, blendMode: GraphicsContext.BlendMode, options: GraphicsContext.ShadowOptions) -> GraphicsContext.Filter

Returns a filter that adds a shadow.

Adjusting Opacity

static var luminanceToAlpha: GraphicsContext.Filter

Returns a filter that sets the opacity of each pixel based on its luminance.

static func alphaThreshold(min: Double, max: Double, color: Color) -> GraphicsContext.Filter

Returns a filter that replaces each pixel with alpha components within a range by a constant color, or transparency otherwise.

Adding a Transformation

static func projectionTransform(ProjectionTransform) -> GraphicsContext.Filter

Returns a filter that that transforms the rasterized form of subsequent graphics primitives.