Scaling alters the size of the object. Sx and Sy are the scaling factors:
(old coordinates are (x, y) and the new coordinates are (x', y'))
x' = x * Sx
y' = y * Sy
If Si > 1.0 then the object becomes larger. If Si < 1.0, then the object becomes smaller. If Sx = Sy then we have uniform scaling and it maintains the relative proportions of the object. If Sx <> Sy then we have differential scaling and it deforms the object.
Examples of Scaling with the object symmetrical about origin (0, 0).
Example of Scaling with the object not symmetrical about the origin (0, 0). Note that this produces both a translation and size change.
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