Transforms

Define transform matrices to apply affine transformations to layers in Core Animation.

Topics

Creating Transforms

CATransform3DMakeTranslation

Returns a transform that translates by (tx, ty, tz).

CATransform3DMakeScale

Returns a transform that scales by (sx, sy, sz).

CATransform3DMakeRotation

Returns a transform that rotates by angle radians about the vector (x, y, z).

Chaining Transforms

CATransform3DConcat

Concatenates b to a and returns the result: t = a * b.

CATransform3DTranslate

Translates t by (tx, ty, tz) and returns the result: t = translate(tx, ty, tz) * t.

CATransform3DScale

Scales t by (sx, sy, sz) and returns the result: t = scale(sx, sy, sz) * t.

CATransform3DRotate

Rotates t by angle radians about the vector (x, y, z) and returns the result.

Inverting a Transform

CATransform3DInvert

Inverts t and returns the result.

Determining Transform Properties

CATransform3DIsAffine

Returns YES if t can be exactly represented by an affine transform.

CATransform3DIsIdentity

Returns a Boolean value that indicates whether the transform is the identity transform.

CATransform3DEqualToTransform

Returns a Boolean value that indicates whether the two transforms are exactly equal.

Converting to and from Core Graphics Affine Transforms

CATransform3DMakeAffineTransform

Returns a transform with the same effect as affine transform m.

CATransform3DGetAffineTransform

Returns the affine transform represented by t.

Data Types

CATransform3D

The standard transform matrix used throughout Core Animation.

Constants

CATransform3DIdentity

The identity transform: [1 0 0 0; 0 1 0 0; 0 0 1 0; 0 0 0 1].