sl.plot.text: Plot Text
In helgegoessling/spheRlab: Spherical Geometry, Analysis, and Plotting of Geoscientific Data on Arbitrary Grids

sl.plot.text

R Documentation

Plot Text

Description

Plot simple text into a spheRlab plot

Usage

sl.plot.text(plot.init.res, lon, lat, labels = seq(1, length(lon)), col = "black", ignore.visibility = FALSE, adj = NULL, pos = NULL, offset = 0.5, vfont = NULL, cex = 1, font = NULL, srt = 0)

Arguments

`plot.init.res`	a spheRlab plot specifics list as returned by `sl.plot.init` (or a variant thereof).
`lon`	a scalar or vector specifying the longitude(s) of the text location(s).
`lat`	a scalar or vector specifying the latitude(s) of the text location(s).
`labels`	a character or character vector specifying the text(s).
`col`	the color to be used, possibly a vector. Default is `col="black"`.
`ignore.visibility`	a logical value indicating whether or not to ignore visibility.
`adj`	one or two values in [0, 1] which specify the x (and optionally y) adjustment of the labels.
`pos`	a position specifier for the text. If specified this overrides any `adj` value given. Values of 1, 2, 3 and 4, respectively indicate positions below, to the left of, above and to the right of the specified coordinates.
`offset`	when `pos` is specified, this value gives the offset of the label from the specified coordinate in fractions of a character width.
`vfont`	`NULL` for the current font family, or a character vector of length 2 for Hershey vector fonts. The first element of the vector selects a typeface and the second element selects a style. Ignored if labels is an expression.
`cex`	numeric character expansion factor; multiplied by `par("cex")` yields the final character size. `NULL` and `NA` are equivalent to `1.0`.
`font`	If `vfont=NULL`, the font to be used, possibly a vector. Defaults to the value of the global graphical parameter in `par()`.
`srt`	a scalar specifying the rotation (counter-clockwise) in degrees. Default is `srt=0`.

Details

Plots simple text at lon-lat locations, using the R function text. Numerous arguments are simply passed to text.

Note

It would be nice if, at some point, a function would be added to spheRlab that allows plotting text on the spherical surface, probably just making use of sl.plot.polygon.