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    that the grab will not faithfully represent the
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    that the grab will not faithfully represent the
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    original scene.
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    original scene.
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  }
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  }
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  \item{wrap}{ A logical indicating how the output should
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  \item{wrap}{ A logical indicating how the output should
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    be captured. If \code{TRUE}, each non-grob element on the
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    be captured. If \code{TRUE}, each non-grob element on the
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    display list is captured by wrapping it in a grob.
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    display list is captured by wrapping it in a grob.
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  }
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  }
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  \item{\dots}{ arguments passed to gTree, for example, a
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  \item{\dots}{ arguments passed to gTree, for example, a
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    name and/or class for the gTree that is created.}
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    name and/or class for the gTree that is created.}
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}
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}
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\details{
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\details{
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  There are four ways to capture grid output as a gTree.
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  There are four ways to capture grid output as a gTree.
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  There are two functions for capturing output:
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  There are two functions for capturing output:
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  use \code{grid.grab} to capture an existing drawing
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  use \code{grid.grab} to capture an existing drawing
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  and \code{grid.grabExpr} to capture the output from
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  and \code{grid.grabExpr} to capture the output from
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  an expression (without drawing anything).
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  an expression (without drawing anything).
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  For each of these functions, the output can be captured in
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  For each of these functions, the output can be captured in
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  two ways.  One way tries to be clever and make a
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  two ways.  One way tries to be clever and make a
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  gTree with a childrenvp slot containing all viewports on
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  gTree with a childrenvp slot containing all viewports on
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  the display list (including those
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  the display list (including those
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  that are popped) and every
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  that are popped) and every