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validating, drawing,
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validating, drawing,
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and modifying graphical objects. Both \code{grob()} and
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and modifying graphical objects. Both \code{grob()} and
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\code{gTree()} call the function \code{\link{validDetails}} to check
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\code{gTree()} call the function \code{\link{validDetails}} to check
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that the object returned is internally coherent.
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that the object returned is internally coherent.
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A \code{"gTree"} can have other grobs as children; when a gTree is drawn, it
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A \code{"gTree"} can have other grobs as children; when a \I{gTree} is drawn, it
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draws all of its children. Before drawing its children, a gTree
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draws all of its children. Before drawing its children, a \I{gTree}
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pushes its \code{childrenvp} slot and then navigates back up (calls
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pushes its \code{childrenvp} slot and then navigates back up (calls
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\code{\link{upViewport}}) so that the children can specify their location
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\code{\link{upViewport}}) so that the children can specify their location
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within the \code{childrenvp} via a \code{\link{vpPath}}.
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within the \code{childrenvp} via a \code{\link{vpPath}}.
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Grob names need not be unique in general, but all children of a
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Grob names need not be unique in general, but all children of a
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gTree must have different names.
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\I{gTree} must have different names.
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A grob name can be any string, though it is not
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A grob name can be any string, though it is not
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advisable to use the \code{\link{gPath}} separator (currently
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advisable to use the \code{\link{gPath}} separator (currently
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\code{::}) in grob names.
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\code{::}) in grob names.
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The function \code{childNames} returns the names of the grobs
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The function \code{childNames} returns the names of the grobs
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which are children of a gTree.
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which are children of a \I{gTree}.
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All grid primitives (\code{\link{grid.lines}}, \code{grid.rect}, ...)
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All grid primitives (\code{\link{grid.lines}}, \code{grid.rect}, ...)
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and some higher-level grid components (e.g., \code{\link{grid.xaxis}}
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and some higher-level grid components (e.g., \code{\link{grid.xaxis}}
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and \code{grid.yaxis}) are derived from these classes.
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and \code{grid.yaxis}) are derived from these classes.
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\code{grobTree} is just a convenient wrapper for \code{gTree}
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\code{grobTree} is just a convenient wrapper for \code{gTree}
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when the only components of the gTree are grobs (so all
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when the only components of the \I{gTree} are grobs (so all
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unnamed arguments become children of the gTree).
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unnamed arguments become children of the \I{gTree}).
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The \code{grid.grob} function is defunct.
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The \code{grid.grob} function is defunct.
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}
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}
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\value{
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\value{
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An \R object of class \code{"grob"}, a \bold{gr}aphical \bold{ob}ject.
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An \R object of class \code{"grob"}, a \bold{gr}aphical \bold{ob}ject.
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