This function is used to make calls to a device to draw a grob. It is generic so new grob classes can write their own methods.
A graphics device.
This function is not called directly by the user. It is exposed so that new grob classes can easily write their own methods which call existing methods for standard grobs.
The difference between this function and
that this one takes care of setting up coordinate systems based on
the grid viewports so that
SVG output is positioned correctly, then it calls
to produce the actual SVG elements.
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