AffineTransform

An affine transformation matrix for use in drawing 2D graphics.

public struct AffineTransform 

Initializers

init()

public init() 

init(a:b:c:d:tx:ty:)

public init( a: Double,  b: Double,
               c: Double,  d: Double,
              tx: Double, ty: Double) 

init(rotationAngle:)

Returns an affine transformation matrix constructed from a rotation value you provide.

public init(rotationAngle radians: Double) 

init(scaleX:y:)

Returns an affine transformation matrix constructed from scaling values you provide.

public init(scaleX sx: Double, y sy: Double) 

init(translationX:y:)

Returns an affine transformation matrix constructed from translation values you provide.

public init(translationX tx: Double, y ty: Double) 

Properties

identity

The identity transform.

public static var identity: AffineTransform 

a

The entry at position [1,1] in the matrix.

public var a: Double

b

The entry at position [1,2] in the matrix.

public var b: Double

c

The entry at position [2,1] in the matrix.

public var c: Double

d

The entry at position [2,2] in the matrix.

public var d: Double

tx

The entry at position [3,1] in the matrix.

public var tx: Double

ty

The entry at position [3,2] in the matrix.

public var ty: Double

isIdentity

Checks whether an affine transform is the identity transform.

public var isIdentity: Bool 

Methods

concatenating(_:)

Returns an affine transformation matrix constructed by combining two existing affine transforms.

public func concatenating(_ transform: AffineTransform) -> AffineTransform 

inverted()

Returns an affine transformation matrix constructed by inverting an existing affine transform.

public func inverted() -> AffineTransform