lattice (version 0.17-25)

panel.axis: Panel Function for Drawing Axis Ticks and Labels

Description

panel.axis is the function used by lattice to draw axes. It is typically not used by users, except those wishing to create advanced annotation. Keep in mind issues of clipping when trying to use it as part of the panel function. current.panel.limits can be used to retrieve a panel's x and y limits.

Usage

panel.axis(side = c("bottom", "left", "top", "right"),
           at,
           labels = TRUE,
           draw.labels = TRUE,
           check.overlap = FALSE,
           outside = FALSE,
           ticks = TRUE,
           half = !outside,
           which.half,
           tck = as.numeric(ticks),
           rot = if (is.logical(labels)) 0 else c(90, 0),
           text.col, text.alpha, text.cex, text.font,
           text.fontfamily, text.fontface,
           line.col, line.lty, line.lwd, line.alpha)
current.panel.limits(unit = "native")

Arguments

side

character string indicating which side axes are to be drawn on. Partial specification is allowed.

at

location of labels

labels

the labels to go along with at. The labels can be a character vector or a vector of expressions. Alternatively, this can be a logical. If TRUE, the labels are derived from at, otherwise, labels are empty.

draw.labels

logical indicating whether labels are to be drawn

check.overlap

logical, whether to check for overlapping of labels. This also has the effect of removing at values that are too close to the limits.

outside

logical, whether to the labels draw outside the panel or inside. Note that outside=TRUE will only have a visible effect if clipping is disabled for the viewport (panel).

ticks

logical, whether to draw the tickmarks

half

logical, whether only half of scales will be drawn for each side

which.half

character string, one of "lower" and "upper". Indicates which half is to be used for tick locations if half=TRUE. Defaults to whatever is suitable for splom

tck

numeric scalar, multiplier for tick length. Can be negative.

rot

rotation angles for labels in degrees. Can be a vector of length 2 for x- and y-axes respectively

text.col, text.alpha, text.cex, text.font, text.fontfamily, text.fontface, line.col, line.lty, line.lwd, line.alpha

graphical parameters

unit

which grid unit the values should be in

Value

• current.panel.limits returns a list with components xlim and ylim, which are both numeric vectors of length 2, giving the scales of the current panel (viewport). The values correspond to the unit system specified by unit, by default "native".

Details

panel.axis can draw axis tick marks inside or outside a panel (more precisely, a grid viewport). It honours the (native) axis scales. Used in panel.pairs for splom, as well as for all the usual axis drawing by the print method for "trellis" objects. It can also be used to enhance plots after the fact by adding axes.

See Also

Lattice, xyplot, trellis.focus, unit