Draw spatial data

sdplot needs a PostScript coordinate system as well as the spatial data, so the ranges have to be given.

Usage

# S3 method for class 'tda_spatial'
plot(
  x,
  xlim = NULL,
  ylim = NULL,
  width = 100,
  height = NULL,
  newpage = TRUE,
  what = c("objects", "hull", "hull_per_polygon"),
  symbol = NULL,
  size = NULL,
  lty = NULL,
  lw = NULL,
  gray = NULL,
  ...
)

Arguments

x

a tda_spatial.

xlim, ylim

ranges of the coordinate system.

width, height

size of the plotting area in millimetres; the height follows the data's aspect ratio unless given.

newpage

start a new page before drawing.

what

what to draw: "objects" (default), the convex hull over every point, or the convex hull of each polygon separately; sdplot's opt=.

symbol, size, lty, lw, gray

marker symbol and size, line type, line width in mm, and grey level from 0 (black) to 1 (white); sdplot's own s=/fs=/lt=/lw=/gs=.

...

further options for sdplot.

Value

The parsed drawing operations, invisibly.

Details

Points need a marker or nothing is drawn: give symbol (or another TDA symbol number). This is the same trap noted for tda_sd_plot3 – without a marker or a zvar attribute, sdplot draws nothing at all rather than erroring.

See also

Other spatial analysis: tda_map(), tda_polygons(), tda_read_dbf(), tda_read_shapefile(), tda_read_spatial, tda_sd(), tda_sd_analyses, tda_sd_ps3(), tda_spatial()

Examples

d <- data.frame(id = 1:4, x = c(0, 1, 1, 0), y = c(0, 0, 1, 1))
s <- tda_spatial(d)
plot(s, symbol = 1)  # a marker is needed; points draw nothing without one