| Querying the Viewport Tree {grid} | R Documentation |
current.viewport()
returns the viewport that Grid is going to draw into.
current.vpTree returns the entire Grid viewport tree.
current.vpPath returns the viewport path to the current viewport.
current.transform returns the transformation
matrix for the current viewport.
current.viewport(vp=NULL) current.vpTree(all=TRUE) current.vpPath() current.transform()
vp |
A Grid viewport object. Use of this argument has been deprecated. |
all |
A logical value indicating whether the entire viewport tree should be returned. |
If all is FALSE then
current.vpTree only returns the subtree below
the current viewport.
A Grid viewport object from current.viewport or
current.vpTree.
current.transform returns a 4x4 transformation matrix.
The viewport path returned by current.vpPath is NULL
if the current viewport is the ROOT viewport
Paul Murrell
grid.newpage() pushViewport(viewport(width=0.8, height=0.8, name="A")) pushViewport(viewport(x=0.1, width=0.3, height=0.6, just="left", name="B")) upViewport(1) pushViewport(viewport(x=0.5, width=0.4, height=0.8, just="left", name="C")) pushViewport(viewport(width=0.8, height=0.8, name="D")) current.vpPath() upViewport(1) current.vpPath() current.vpTree() current.viewport() current.vpTree(all=FALSE) popViewport(0)