GTransform

This class represents an affine transformation. Essentially, it's a 2 by 2 matrix, plus two fields for an $x$ and $y$ transformation.

Applying such a transformation multiplies the vector field that makes up a given GObject by $$\begin{bmatrix} a & b \\ c & d \end{bmatrix}$$ ...then transforms the space by $(tx, ty)$.

This class is not intended to be used directly. Every GObject contains one, and its properties may be updated using methods like GObject::shear, etc.

Factory Methods

function GTransform()

Creates a new GTransform with the identity matrix, i.e. $$\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$$ and no transform.

function GTransform(transform)

Creates a new GTransform that's a copy of the passed-in transform.

function GTransform(a, b, c, d[, tx=0, ty=0])

Creates a new GTransform with the following matrix: $$\begin{bmatrix} a & b \\ c & d \end{bmatrix}$$ tx and ty can also be specified in the constructor, but default to 0,0.

Fields

GTransform::a

GTransform::b

GTransform::c

GTransform::d

The matrix values $a$, $b$, $c$, and $d$, respectively.

GTransform::tx

GTransform::ty

The $x$ and $y$ transform values, respectively.