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In Flex you have the ability to work with a structured hierarchy of display objects - each with their own transformation matrix. Flex pretty much handles all of the relevant transforms when you are doing event handling.

Of course, ultimately you can do all of that in a canvas but it is an awful lot easier in Flex.

Also, don't you have to manage the redraw of areas yourself with canvas?

[NB I hate what people do with Flash as much as the next person - but the actually tool is actually a pretty decenlt development environment (I just used the command line Flex compiler)]

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