Replacements of traditional graphics functions
These functions are intended to replace common low level traditional graphics functions, primarily for use in panel functions. The originals can not be used (at least not easily) because lattice panel functions need to use grid graphics. Low level drawing functions in grid can be used directly as well, and is often more flexible. These functions are provided for convenience and portability.
lplot.xy(xy, type, pch, lty, col, cex, lwd, font, fontfamily, fontface, col.line, col.symbol, alpha, fill, origin = 0, …, identifier, name.type)
llines(x, ...) lpoints(x, ...) ltext(x, ...)
# S3 method for default llines(x, y = NULL, type = "l", col, alpha, lty, lwd, …, identifier, name.type) # S3 method for default lpoints(x, y = NULL, type = "p", col, pch, alpha, fill, font, fontfamily, fontface, cex, …, identifier, name.type) # S3 method for default ltext(x, y = NULL, labels = seq_along(x), col, alpha, cex, srt = 0, lineheight, font, fontfamily, fontface, adj = c(0.5, 0.5), pos = NULL, offset = 0.5, …, identifier, name.type)
lsegments(x0, y0, x1, y1, x2, y2, col, alpha, lty, lwd, font, fontface, …, identifier, name.type) lrect(xleft, ybottom, xright, ytop, x = (xleft + xright) / 2, y = (ybottom + ytop) / 2, width = xright - xleft, height = ytop - ybottom, col = "transparent", border = "black", lty = 1, lwd = 1, alpha = 1, just = "center", hjust = NULL, vjust = NULL, font, fontface, …, identifier, name.type) larrows(x0 = NULL, y0 = NULL, x1, y1, x2 = NULL, y2 = NULL, angle = 30, code = 2, length = 0.25, unit = "inches", ends = switch(code, "first", "last", "both"), type = "open", col = add.line$col, alpha = add.line$alpha, lty = add.line$lty, lwd = add.line$lwd, fill = NULL, font, fontface, …, identifier, name.type) lpolygon(x, y = NULL, border = "black", col = "transparent", fill = NULL, font, fontface, …, identifier, name.type)
panel.lines(…) panel.points(…) panel.segments(…) panel.text(…) panel.rect(…) panel.arrows(…) panel.polygon(…)
- x, y, x0, y0, x1, y1, x2, y2, xy
y2are available for for S compatibility.
- length, unit
determines extent of arrow head.
lengthspecifies the length in terms of
unit, which can be any valid grid unit as long as it doesn't need a
unitdefaults to inches, which is the only option in the base version of the function,
- angle, code, type, labels, srt, adj, pos, offset
arguments controlling behaviour. See respective base functions for details. For
"closed", indicating the type of arrowhead.
serves the same function as
code, using descriptive names rather than integer codes. If specified, this overrides
- col, alpha, lty, lwd, fill, pch, cex, lineheight, font, fontfamily, fontface, col.line, col.symbol, border
fillapplies to points when
21:25and specifies the fill color, similar to the
bgargument in the base graphics function
points. For devices that support alpha-transparency, a numeric argument
alphabetween 0 and 1 can controls transparency. Be careful with this, since for devices that do not support alpha-transparency, nothing will be drawn at all if this is set to anything other than 0.
fontfaceare included in
lsegmentsonly to ensure that they are not passed down (as
gpardoes not like them).
type="H", the value to which lines drop down.
- xleft, ybottom, xright, ytop
- width, height, just, hjust, vjust
finer control over rectangles, see
extra arguments, passed on to lower level functions as appropriate.
A character string that is prepended to the name of the grob that is created.
A character value indicating whether the name of the grob should have panel or strip information added to it. Typically either
""(for no extra information).
These functions are meant to be grid replacements of the corresponding
base R graphics functions, to allow existing Trellis code to be used
with minimal modification. The functions
essentally identical to the
l* versions, are recommended for
use in new code (as opposed to ported code) as they have more readable
See the documentation of the base functions for usage. Not all arguments are always supported. All these correspond to the default methods only.
There is a new
type="H" option wherever appropriate, which is
type="h", but with horizontal lines.