When you invert a transform a rotation clockwise becomes an identical rotation anti-clockwise. A translation to the left becomes a translation to the right. A zoom in becomes a zoom out.

Note that not every transform can be inverted. If you specify a magnification of zero you have shrunk your world space to a point. In this case it is not possible to invert the transform to get the original back again. However this kind of transform is uncommon in the real world and normally only occurs as a result of programming errors.

If you apply the invert method to a non-invertible transform the transform will remain unmodified.

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