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  is being added to the display list or redrawn from the display list. }
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  is being added to the display list or redrawn from the display list. }
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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{preDrawDetails} is called first during the drawing of a grob.
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  \code{preDrawDetails} is called first during the drawing of a grob.
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  This is where any additional viewports should be pushed (see,
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  This is where any additional viewports should be pushed (see,
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  for example, \code{grid:::preDrawDetails.frame}).  Note that
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  for example, \code{grid:::preDrawDetails.frame}).  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 there is typically nothing to do here.
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  \code{childrenvp} slot so there is typically nothing to do here.
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  \code{drawDetails} is called next and is where any additional
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  \code{drawDetails} is called next and is where any additional
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  calculations and graphical output should occur (see, for example,
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  calculations and graphical output should occur (see, for example,
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  \code{grid:::drawDetails.xaxis}.  Note that the default behaviour
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  \code{grid:::drawDetails.xaxis}.  Note that the default behaviour
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  for gTrees is to draw all grobs in the \code{children} slot
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  for gTrees is to draw all grobs in the \code{children} slot
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  so there is typically nothing to do here.
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  so there is typically nothing to do here.