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The six elements in this list represent the following elements
of the three by three transformation matrix:.
[a, b, 0].
[c, d, 0].
[e, f, 1].
The Elements array holds the six values [a, b, c, d, e, f] of
the transformation matrix. These values define the affine
transformation applied to coordinates: x' = a*x + c*y + e, y' = b*x
+ d*y + f.
The e and f values encode translation, a and d encode scaling on
the x and y axes, and b and c introduce rotation or shear. All six
values together define a general affine transformation.
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