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\item{x}{ A grid grob. }
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\item{x}{ A grid grob. }
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}
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}
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\details{
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\details{
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These functions are called by the \code{grid.draw} methods for grobs
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These functions are called by the \code{grid.draw} methods for grobs
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and gTrees.
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and gTrees.
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\code{makeContext} is called first during the drawing of a grob.
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\code{makeContext} is called first during the drawing of a grob.
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This function should be used to \emph{modify} the \code{vp} slot
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This function should be used to \emph{modify} the \code{vp} slot
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of \code{x} (and/or the \code{childrenvp} slot if \code{x}
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of \code{x} (and/or the \code{childrenvp} slot if \code{x}
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is a gTree). The function \emph{must} return the modified \code{x}.
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is a gTree). The function \emph{must} return the modified \code{x}.
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Note that
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Note that
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the default behaviour for grobs is to push any viewports in the
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the default behaviour for grobs is to push any viewports in the
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\code{vp} slot, and for gTrees is to also push and up any viewports in the
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\code{vp} slot, and for gTrees is to also push and up any viewports in the
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\code{childrenvp} slot, so this function is used to customise the
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\code{childrenvp} slot, so this function is used to customise the
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drawing context for a grob or gTree.
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drawing context for a grob or gTree.
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\code{makeContent} is called next and is where any additional
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\code{makeContent} is called next and is where any additional
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calculations should occur and graphical content should
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calculations should occur and graphical content should
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be generated (see, for example,
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be generated (see, for example,
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\code{grid:::makeContent.xaxis}.
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\code{grid:::makeContent.xaxis}.
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This function should be used to \emph{modify} the \code{children}
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This function should be used to \emph{modify} the \code{children}
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