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\description{
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\description{
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  Determine the number of levels in a viewport stack or tree,
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  Determine the number of levels in a viewport stack or tree,
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  in a viewport path, or in a grob path.
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  in a viewport path, or in a grob path.
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}
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}
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\usage{
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\usage{
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depth(x)
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depth(x, ...)
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\method{depth}{viewport}(x)
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\method{depth}{viewport}(x, ...)
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\method{depth}{path}(x)
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\method{depth}{path}(x, ...)
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}
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}
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%- maybe also 'usage' for other objects documented here.
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%- maybe also 'usage' for other objects documented here.
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\arguments{
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\arguments{
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  \item{x}{
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  \item{x}{
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    Typically a viewport or viewport stack or viewport tree or viewport
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    Typically a viewport or viewport stack or viewport tree or viewport
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    list, or a viewport path, or a grob path.
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    list, or a viewport path, or a grob path.
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  }
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  }
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  \item{\dots}{ Arguments used by other methods. }
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}
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}
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\details{
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\details{
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  Depths of paths are pretty straightforward because they contain
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  Depths of paths are pretty straightforward because they contain
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  no branchings.  The depth of a viewport stack is the sum of the depths
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  no branchings.  The depth of a viewport stack is the sum of the depths
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  of the components of the stack.  The depth of a viewport tree is
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  of the components of the stack.  The depth of a viewport tree is