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A KineticJS Layer wrapper which allows for displaying a large canvas by only rendering objects within the viewable area and providing zooming in/out and panning of X and Y axes in order to move the viewing region. This is necessary for performance reasons. An example usage is for displaying a large game-world in a limited view-area, as most modern RTS games do.

View-space coordinates are different than game-world coordinates - viewport handles the conversion.

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