llines {lattice}R Documentation

Replacements of traditional graphics functions

Description

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.

Usage

lplot.xy(xy, type, pch, lty, col, cex, lwd,
         font, fontfamily, fontface,
         col.line, alpha, fill,
         origin = 0, ...)

llines(x, ...)
lpoints(x, ...)
ltext(x, ...)

## Default S3 method:
llines(x, y = NULL, type = "l",
       col, alpha, lty, lwd, ...)
## Default S3 method:
lpoints(x, y = NULL, type = "p", col, pch, alpha, fill,
        font, fontfamily, fontface, cex, ...)  
## Default S3 method:
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, ...)  

lsegments(x0, y0, x1, y1, x2, y2,
          col, alpha, lty, lwd, ...)
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,
      ...)
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, ...)
lpolygon(x, y = NULL,
         border = "black", col = "transparent", ...)

panel.lines(...)
panel.points(...)
panel.segments(...)
panel.text(...)
panel.rect(...)
panel.arrows(...)
panel.polygon(...)

Arguments

x, y, x0, y0, x1, y1, x2, y2, xy locations. x2 and y2 are available for for S compatibility.
length, unit determines extent of arrow head. length specifies the length in terms of unit, which can be any valid grid unit as long as it doesn't need a data argument. unit defaults to inches, which is the only option in the base version of the function, arrows.
angle, code, type, labels, srt, adj, pos, offset arguments controlling behaviour. See respective base functions for details. For larrows and panel.larrows, type is either "open" or "closed", indicating the type of arrowhead.
ends serves the same function as code, using descriptive names rather than integer codes. If specified, this overrides code
col, alpha, lty, lwd, fill, pch, cex, lineheight, font, fontfamily, fontface, col.line, border graphical parameters. fill applies to points when pch is in 21:25 and specifies the fill color, similar to the bg argument in the base graphics function points. For devices that support alpha-transparency, a numeric argument alpha between 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.
origin for type="h" or type="H", the value to which lines drop down.
xleft, ybottom, xright, ytop see rect
width, height, just, hjust, vjust finer control over rectangles, see grid.rect
... extra arguments, passed on to lower level functions as appropriate.

Details

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 panel.* are essentally identical to the l* versions, are recommended for use in new code (as opposed to ported code) as they have more readable names.

See the documentation of the base functions for usage. Not all arguments are always supported. All these correspond to the default methods only.

Note

There is a new type="H" option wherever appropriate, which is similar to type="h", but with horizontal lines.

Author(s)

Deepayan Sarkar Deepayan.Sarkar@R-project.org

See Also

points, lines, rect, text, segments, arrows, Lattice


[Package lattice version 0.15-4 Index]