- Ovidiu Predescu (
`ovidiu@net-community.com`

) - Richard Frith-Macdonald (
`richard@brainstorm.co.uk`

)

This class provides a way to perform affine transforms. It provides a matrix for transforming from one coordinate system to another.

**Copyright:** (C) 1996,1999 Free Software Foundation, Inc.

Declared in:- Foundation/NSAffineTransform.h

Conforms to:- NSCopying
- NSCoding

- +transform
- -appendTransform:
- -initWithTransform:
- -invert
- -prependTransform:
- -rotateByDegrees:
- -rotateByRadians:
- -scaleBy:
- -scaleXBy:yBy:
- -setTransformStruct:
- -transformPoint:
- -transformSize:
- -transformStruct
- -translateXBy:yBy:

Return an autoreleased instance of this class.

Appends the transform matrix to the receiver. This
is done by performing a matrix multiplication of the
receiver with `aTransform` so that
`aTransform` is the first transform applied
to the user coordinate. The new matrix then replaces the
receiver's matrix.

Initialize the receiever's instance with the
instance represented by `aTransform`.

Calculates the inverse of the receiver's matrix
and replaces the receiever's matrix with it.

Prepends the transform matrix to the receiver.
This is done by performing a matrix multiplication of
the receiver with `aTransform` so that
`aTransform` is the last transform applied
to the user coordinate. The new matrix then replaces the
receiver's matrix.

Applies the rotation specified by `angle`
in degrees. Points transformed with the transformation
matrix of the receiver are rotated counter-clockwise
by the number of degrees specified by `angle`.

Applies the rotation specified by angle in radians.
Points transformed with the transformation matrix of
the receiver are rotated counter-clockwise by the
number of radians specified by angle.

Scales the transformation matrix of the reciever by
the factor specified by `scale`.

Scales the X axis of the receiver's transformation
matrix by `scaleX` and the Y axis of the
transformation matrix by `scaleY`.

Sets the structure which represents the matrix of the reciever. The struct is of the form:

{m11, m12, m21, m22, tX, tY}

Transforms a single point based on the
transformation matrix. Returns the resulting
point.

Transforms the NSSize represented by
`aSize` using the reciever's transformation
matrix. Returns the resulting NSSize.

NB. A transform can result in negative size components ... so calling code should check for and deal with that situation.

NB. A transform can result in negative size components ... so calling code should check for and deal with that situation.

Returns the `NSAffineTransformStruct`

structure which represents the matrix of the
reciever. The struct is of the form:

{m11, m12, m21, m22, tX, tY}

Applies the translation specified by
`tranX` and `tranY` to the
receiver's matrix. Points transformed by the
reciever's matrix after this operation will be
shifted in position based on the specified
translation.

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