This function is intended to be used similarly to
grid.clip. The key difference is that instead of
applying a new clipping context to the viewport, we apply a new
pushMask(mask = NULL, label = NULL, name = NULL, draw = TRUE)
A label for a defined reference.
A character identifier for the grob applying the masking context.
A logical value indicating whether graphics output should be produced.
label is specified, uses a mask that has been supplied to
mask is specified it will be used as
the new masking context for the current viewport. If both are
specified, it will attempt to define the mask with the given label, as
well as applying the mask as the new masking context for the current
popMask is an alias for
pushMask grob. The value is returned invisibly.
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