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When I at certain zoom level in the UML diagram and I just wanted to print the diagram at that zoom level, there's no way to do that. Should have such an option.
Print manager prints component marked as "print.printable" and invokes print() method of the component for preview and printer output. So, it is up to UML component which data will be passed to the Print Manager. Also method printAction(PrintProvider [] providers) can be used to specify the pages directly.