grid.force {grid} | R Documentation |
Some grobs only generate their content to draw at drawing time; this function replaces such grobs with their at-drawing-time content.
grid.force(redraw = TRUE) grid.revert(redraw = TRUE)
redraw |
logical value indicating whether to redraw the grid scene after the forcing operation. |
Some grobs wait until drawing time to generate what content
will actually be drawn (an axis, as produced by grid.xaxis()
,
with an at
or NULL
is a good example because it
has to see what viewport it is going to be drawn in before
it can decide what tick marks to draw).
The content of such grobs (e.g., the tick marks) are not usually
visible to grid.ls()
or accessible to grid.edit()
.
The grid.force()
function replaces a grob with its
at-drawing-time contents. For example, an axis will be
replaced by a vanilla gTree with lines and text representing
the axis tick marks that were actually drawn. This makes
the tick marks
visible to grid.ls()
and accessible to grid.edit()
.
The grid.revert()
function reverses the effect of
grid.force()
, replacing forced content with the original
grob.
These functions only have an effect for grobs that generate their content
at drawing time using makeContext()
and makeContent()
methods (not for grobs that generate their content
at drawing time using preDrawDetails()
and
drawDetails()
methods).
Paul Murrell
grid.newpage() pushViewport(viewport(width=.5, height=.5)) grid.xaxis() grid.ls() grid.force() grid.ls() grid.revert() grid.ls()