Representation of a 2-D affine transformation.
The Matrix type represents a 2x2 transformation matrix along with a
translation vector. Matrix a1 a2 b1 b2 c1 c2 describes the
transformation of a point with coordinates x,y that is defined by
/ x' \ = / a1 b1 \ / x \ + / c1 \
\ y' / \ a2 b2 / \ y / \ c2 /
or
x' = a1 * x + b1 * y + c1
y' = a2 * x + b2 * y + c2
|