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}
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}
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\details{
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\details{
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  The angle is anti-clockwise with zero corresponding to a line
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  The angle is anti-clockwise with zero corresponding to a line
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  with an origin centred between the extreme
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  with an origin centred between the extreme
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  points of the shape, and pointing at 3 o'clock.
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  points of the shape, and pointing at 3 o'clock.
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  If the grob describes a single shape, the boundary value should
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  If the grob describes a single shape, the boundary value should
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  correspond to the exact edge of the shape.
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  correspond to the exact edge of the shape.
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  If the grob describes multiple shapes, the boundary
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  If the grob describes multiple shapes, the boundary
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  value will either correspond to the edge of a bounding box around all of
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  value will either correspond to the edge of a bounding box around all of
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  the shapes described by the grob (for multiple rectangles, circles,
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  the shapes described by the grob (for multiple rectangles, circles,
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  xsplines, or text), or to a
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  xsplines, or text), or to a
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  convex hull around all vertices of all shapes described by the grob
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  convex hull around all vertices of all shapes described by the grob
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  (for multiple polygons, points, lines, polylines,
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  (for multiple polygons, points, lines, polylines,
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  and segments).
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  and segments).
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  Points grobs are currently a special case because the convex hull
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  Points grobs are currently a special case because the convex hull
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  is based on the data symbol \emph{locations} and does not take
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  is based on the data symbol \emph{locations} and does not take
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  into account the extent of the data symbols themselves.
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  into account the extent of the data symbols themselves.
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  The extents of any arrow heads are currently \emph{not} taken into account.
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  The extents of any arrow heads are currently \emph{not} taken into account.
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}
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}
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\value{
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\value{
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  A unit object.
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  A unit object.
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}
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}
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\author{Paul Murrell}
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\author{Paul Murrell}
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\seealso{
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\seealso{
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  \code{\link{unit}} and
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  \code{\link{unit}} and
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  \code{\link{grobWidth}}
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  \code{\link{grobWidth}}