IdentityMatrix returns the identity transform.

NewMatrix returns an affine transform matrix laid out in homogenous coordinates as a b 0 c d 0 tx ty 1.

NewPoint returns a Point at `(x,y)`.

RotationMatrix returns a matrix that rotates by angle `angle`, specified in radians.

ScaleMatrix returns a matrix that scales by `x`,`y`.

ShearMatrix returns a matrix that shears `x`,`y`.

TranslationMatrix returns a matrix that translates by `tx`,`ty`.

Point defines a point (X,Y) in Cartesian coordinates.

Matrix is a linear transform matrix in homogenous coordinates.