Draw an X-Axis
These functions create and draw an x-axis.
grid.xaxis(at = NULL, label = TRUE, main = TRUE, edits = NULL, name = NULL, gp = gpar(), draw = TRUE, vp = NULL)
xaxisGrob(at = NULL, label = TRUE, main = TRUE, edits = NULL, name = NULL, gp = gpar(), vp = NULL)
A numeric vector of x-value locations for the tick marks.
A logical value indicating whether to draw the labels on the tick marks, or an expression or character vector which specify the labels to use. If not logical, must be the same length as the
A logical value indicating whether to draw the axis at the bottom (
TRUE) or at the top (
FALSE) of the viewport.
A gEdit or gEditList containing edit operations to apply (to the children of the axis) when the axis is first created and during redrawing whenever
A character identifier.
An object of class
gpar, typically the output from a call to the function
gpar. This is basically a list of graphical parameter settings.
A logical value indicating whether graphics output should be produced.
A Grid viewport obect (or
Both functions create an xaxis grob (a graphical object describing an
xaxis), but only
draws the xaxis (and then only if
An xaxis grob.
grid.xaxis returns the value invisibly.
at slot of an xaxis grob is not
the xaxis will have the following children:
representing the line at the base of the tick marks.
representing the tick marks.
representing the tick labels.
at slot is
NULL then there are no children
and ticks are drawn based on the current viewport scale.