feOffset: Offset an input image relative to its current position.
In sachsmc/gridSVG: Export grid graphics as SVG

This filter primitive offsets the input image relative to its current position in the image space by the specified vector.

This is important for effects like drop shadows.

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feOffset(input = NA,
         dx = unit(0, "npc"), dy = unit(0, "npc"),
         default.units = "npc", ...)

`input`	Identifies an input for this filter primtive. See `filterInputs`.
`dx`	The amount to offset `input` by along the x-axis.
`dy`	The amount to offset `input` by along the y-axis.
`default.units`	A string indicating the default units to use if `dx` or `dy` are only given as numeric vectors.
`...`	Further arguments to be passed onto `fe`.